Composite fairing assembly airtightness detection tool and method

Abstract

The invention provides a composite fairing assembly airtightness detection tool, which comprises a base, a supporting seat, an auxiliary positioning seat and a top cover, and is characterized in that the base is used for supporting the bottom of a fairing and axially limiting the fairing, and the base and the fairing realize lower sealing; the supporting seat is mounted on the upper side of the base, and a top seat is detachably mounted at the top of the supporting seat; the auxiliary positioning seat is detachably mounted on the upper side of the top seat and used for positioning the metal adapter ring and supporting the metal adapter ring; the top cover is detachably installed on the upper side of the auxiliary positioning base and used for pressing the upper end face of the metal adapter ring to achieve upper sealing. The device is reasonable in structural design, corresponding modules can be rapidly adjusted or replaced according to the sizes, angles and interface specifications of different fairings, tool generalization and seamless connection of assembly and detection processes are achieved, damage to positioning precision caused by repeated disassembly and assembly is avoided, product quality is guaranteed, and working efficiency is improved.

Description

Technical Field

[0001] This invention belongs to the field of composite material processing technology, and in particular relates to a tooling and method for testing the airtightness of a composite fairing assembly. Background Technology

[0002] Traditional fairing assembly methods rely heavily on manual experience, resulting in complex, inefficient, and precision-constrained operations. While fairing assembly fixtures have been developed, ordinary fixtures lack specific design features, making it difficult to accurately locate special parts of the fairing. This can easily introduce installation position errors between the fairing and adjacent components. Furthermore, due to insufficient sealing, assembly fixtures are unsuitable for use as sealing testing fixtures. Consequently, sealing testing fixtures typically employ two different structures from assembly fixtures. Assembly is performed using the assembly fixtures first, and then the assembled fairing is installed onto the testing fixtures for airtightness testing. This inefficient collaboration leads to a disjointed overall workflow and low production efficiency. Summary of the Invention

[0003] In view of this, the present invention aims to overcome the defects in the prior art and proposes a tooling and method for testing the airtightness of composite fairing assembly.

[0004] To achieve the above objectives, the technical solution created by this invention is implemented as follows: A composite fairing assembly airtightness testing fixture, comprising: The base is used to support the bottom of the fairing and to provide axial and axial restraint for the fairing. The base and the fairing are sealed at the bottom by a sealing element. A support base is installed on the upper side of the base, and a top base is detachably installed on the top of the support base; An auxiliary positioning seat is detachably installed on the upper side of the top seat to position and support the metal adapter ring. The top cover is detachably installed on the upper side of the auxiliary positioning seat to press the upper end face of the metal adapter ring and achieve upper sealing; in addition, the top cover is provided with a test port, the auxiliary positioning seat is provided with a through hole corresponding to the test port, and the top seat is provided with a hollow structure corresponding to the test port.

[0005] Furthermore, the outer wall of the base is provided with a positioning step, and a positioning protrusion is provided on the positioning step corresponding to the slot of the fairing.

[0006] Furthermore, a handrail is detachably installed on the outer wall of the base, and the handrail is installed below the positioning step.

[0007] Furthermore, the connecting parts at both ends of the handrail are fixed to the base with screws.

[0008] Furthermore, the handrail has an upward bend.

[0009] Furthermore, the support base has an inclined mounting surface, and the top seat is mounted inclinedly on the mounting surface.

[0010] Furthermore, the lower part of the support base is provided with a flange, which is fixed to the base by screws.

[0011] Furthermore, the top seat is fixed to the upper end face of the support seat by screws.

[0012] Furthermore, several auxiliary positioning seats are spaced apart along the circumference of the metal transition ring. Each auxiliary positioning seat includes a support block mounted on the top seat, and a clamping block is detachably mounted on the support block by screws.

[0013] A method for airtightness testing of composite fairing assembly using the above-mentioned tooling includes the following steps: Assembly fixtures for assembling and fitting the composite fairing to be tested. Apply epoxy resin evenly to the outer surface of the metal adapter ring, then use the auxiliary positioning seat to clamp and fix the metal adapter to the fairing, and put the composite fairing into the assembly fixture from top to bottom. The composite fairing is axially positioned by the positioning steps of the base, and circumferentially positioned by the positioning protrusions of the base. Install the fairing fixing screws to fix the fairing to the base. After the epoxy resin has cured, use rivets to fix the metal adapter ring to the composite fairing; remove the clamping block of the auxiliary positioning seat. Install the fluororubber sealing gasket onto the upper surface of the metal adapter ring, install the top cover, support the top cover with the support block of the auxiliary positioning seat, tighten the fixing screws to fix the top cover, and connect the air tube to the test port of the top cover, and install a pressure gauge on the air tube. The trachea is connected to an external air source for airtightness testing; After the airtightness test is completed, remove the fixing screws, top cover, rubber gasket, and fairing fixing screws, lift the composite fairing upwards, and remove it from the assembly fixture.

[0014] Compared with existing technologies, the present invention has the following advantages: This invention features a rationally designed structure. From the base at the bottom, the support base and top seat in the middle, to the auxiliary positioning seat and top cover at the top, each functional module can be flexibly combined using detachable methods such as screws. This not only facilitates processing, transportation, and maintenance, but also allows for quick adjustment or replacement of corresponding modules according to the size, angle, and interface specifications of different fairings, achieving tooling universality and reducing tooling costs for multi-variety production. Simultaneously, the base and top cover, together with sealing components, reliably seal the upper and lower ends of the fairing. The test port on the top cover, the through hole in the auxiliary positioning seat, and the hollow structure of the top seat form a through channel for airtightness testing without disassembly, seamlessly connecting the assembly and testing processes. This avoids damage to positioning accuracy caused by repeated disassembly and assembly, ensuring product quality.

[0015] Furthermore, the inclined mounting surface design of the support base allows the tooling to precisely preset the fairing assembly angle. The circumferentially spaced and finely adjustable auxiliary positioning seats provide uniform and stable multi-point flexible clamping for the metal adapter ring. The introduction of a detachable handrail on the side of the base enhances the ergonomics and convenience of operating large tooling. In summary, this invention systematically solves the problems of traditional tooling's single function, poor adaptability, cumbersome operation, and difficulty in ensuring accuracy, from overall layout to detailed structure, effectively improving fairing assembly accuracy and testing efficiency. Attached Figure Description

[0016] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments and descriptions of the invention are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings: Figure 1 A schematic diagram of the structure created by this invention; Figure 2 This is a schematic diagram of the auxiliary positioning seat in this invention; Figure 3 A cross-sectional view created for this invention; Figure 4 A cross-sectional view of the base in this invention; Figure 5 This is a schematic diagram of an embodiment of the present invention with a heater provided; Figure 6 for Figure 5 A schematic diagram of the central support section; Figure 7 for Figure 6 A schematic diagram after the heater has been removed; Figure 8 A schematic diagram illustrating the application of this invention in airtightness testing. Figure 9 for Figure 8 A schematic diagram after removing the trachea and pressure gauge. Detailed Implementation

[0017] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0018] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0019] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0020] The invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0021] A composite fairing assembly airtightness testing fixture, such as Figures 1 to 9 As shown, it includes a base 1, a support 2, an auxiliary positioning seat 3, and a top cover 4, wherein: The base is used to support the bottom of the fairing and to provide axial and axial positioning for the fairing. The base and the fairing are sealed at the bottom by a sealing element 5. A support base is installed on the upper side of the base, and a top seat 6 is detachably installed on the top of the support base; An auxiliary positioning seat is detachably installed on the upper side of the top seat to position the metal adapter ring 7 and provide support for the metal adapter ring. The top cover is detachably installed on the upper side of the auxiliary positioning seat to press the upper end face of the metal adapter ring and achieve upper sealing; in addition, the top cover is provided with a test port 8, the auxiliary positioning seat is provided with a through hole 9 corresponding to the test port, and the top seat is provided with a hollow structure 10 corresponding to the test port.

[0022] The outer wall of the base is provided with a positioning step 11, and a positioning protrusion 12 is provided on the positioning step corresponding to the slot of the fairing. As an example, the sealing element is a fluororubber O-ring, which is arranged above the positioning step of the base and between the outer wall of the base and the inner wall of the fairing to achieve a seal between the base and the fairing.

[0023] The tooling provided by this invention achieves integrated assembly positioning and airtightness testing of the fairing through a modular and detachable design of a base, support base, auxiliary positioning base, and top cover, significantly improving assembly accuracy and testing efficiency. The base forms a lower seal with the bottom of the fairing via a sealing element. The support base is installed on the upper side of the base and supports the top seat. The auxiliary positioning base is detachably installed on the upper side of the top seat to precisely position and support the metal transition ring. The top cover presses against the upper surface of the metal transition ring to achieve an upper seal. This layered and progressive structural design ensures the axial and radial positioning accuracy of the fairing during assembly, avoiding the cumulative errors caused by traditional manual scribing positioning.

[0024] In addition, the test port on the top cover, the corresponding through holes on the auxiliary positioning seat, and the hollow structure on the top seat form a through airtightness testing channel. This allows for airtightness testing without disassembly after the fairing is assembled, ensuring the sealing integrity of the testing environment and avoiding damage to the positioning accuracy of the fairing and metal adapter ring caused by repeated disassembly and assembly. This achieves seamless integration of assembly and testing, simplifies the operation process, reduces tooling change time, and also achieves the universality and adaptability of tooling through a modular and detachable structure. It can meet the assembly and testing needs of fairings of different specifications, greatly improving production efficiency and product quality consistency.

[0025] A handrail 13 is detachably mounted on the outer wall of the base, and the handrail is positioned below the positioning step. For example, the connecting parts at both ends of the handrail are fixed to the base with screws, and the handrail has an upwardly bent portion 14. This improves the ease of operation and safety of the tooling. The handrail is fixed to the base with screws at both ends; this detachable connection method facilitates installation and replacement while ensuring a secure connection. The upwardly bent portion design of the handrail increases grip comfort and provides sufficient operating space, preventing interference between the operator's hands and other parts of the tooling.

[0026] Because the handrail is installed below the positioning step, it makes full use of the structural space of the base. It will not affect the assembly and positioning of the fairing, and provides a stable point of force for the operator. When moving, flipping or adjusting the position of the tooling, the operator can easily apply force with the help of the handrail, which effectively reduces labor intensity, improves operational safety, solves the problems of difficult handling and inconvenient operation of traditional tooling, and further improves assembly efficiency and working comfort.

[0027] The support base has an inclined mounting surface 27, and the top seat is installed inclined on the mounting surface. By designing the top of the support base as an inclined mounting surface and installing the top seat accordingly at an inclined angle, precise positioning and support of the fairing at a specific angle are achieved, enhancing the tooling's process adaptability and functional flexibility. The inclined mounting surface of the support base precisely matches the design angle of the bottom surface of the fairing to be assembled. The top seat is installed through this inclined surface, enabling the fairing to obtain a pre-set attitude that meets design requirements at the initial stage of assembly. This not only simplifies subsequent adjustment procedures, but more importantly, this "one-step" angle positioning fundamentally ensures the alignment of the fairing and the metal transition ring, allowing the tooling to adapt to the assembly requirements of fairings with non-horizontal mating surfaces. This solves the drawback of traditional horizontal tooling requiring additional complex wedges or shims for angle adjustment, avoiding the introduction of additional assembly errors and significantly improving assembly efficiency.

[0028] The lower part of the support base is provided with a flange 15, which is fixed to the base with screws. The top seat is fixed to the upper end face of the support base with screws. The support base and the base, as well as the top seat and the support base, can be detachably fixed, realizing modular combination. This makes installation and disassembly very convenient. It not only facilitates the independent processing, transportation and storage of each component, but also allows for the quick replacement or adjustment of corresponding modules (such as replacing the support base and top seat with different heights or angles) according to the size and model of the fairing under test, thus improving versatility.

[0029] Several auxiliary positioning seats are evenly distributed along the circumference of the metal adapter ring. Each auxiliary positioning seat includes a support block 16 mounted on the top seat, and a clamping block 17 is detachably mounted on the support block by fixing screws 25. The spaced arrangement of the auxiliary positioning seats provides uniform and stable multi-point radial support and constraint for the annular part, effectively preventing part deformation or inaccurate positioning caused by excessive local stress. The separate and detachable design of the support block and the clamping block allows for flexible selection or quick replacement of clamping blocks with different contours according to the specific outer shape of the metal adapter ring, realizing precise and flexible clamping and positioning of adapter rings of various specifications.

[0030] Meanwhile, the support block can serve as the mounting base for the top cover, enabling it to be used as an airtightness testing fixture without disassembling the assembly device. Overall, from the stable modular combination at the bottom to the finely adjustable multi-point positioning at the top, this solution constructs a three-dimensional positioning system that combines rigid support with flexible adaptability. While ensuring assembly positioning accuracy and repeatability, it greatly expands the process applicability of the fixture, providing strong support for high-efficiency, multi-variety flexible production.

[0031] Based on actual needs, select assembly fixtures that match the structure of the fairing to be tested. Specifically, the positioning step of the base matches the bottom of the fairing, and the seals on the base can form a seal with the inner wall of the fairing. The support seat installed on the base matches the height of the fairing to be tested. The top plate serves as the mounting base for the auxiliary positioning seat, ensuring that the auxiliary positioning seat can effectively form a positioning with the metal transition ring. Use fixing screws 25 to fix the top cover to the auxiliary positioning seat or the top seat, so that the top cover presses against the upper end face of the metal transition ring. Since there is a rubber sealing gasket on the underside of the top cover, the sealing between the top cover and the metal transition ring is guaranteed.

[0032] The method for assembling and airtightly testing composite fairings using the above-mentioned tooling is as follows: Apply epoxy resin evenly to the outer surface of the metal adapter ring, and then use the auxiliary positioning seat to clamp and fix the metal adapter to the fairing 23, as shown. Figure 3 As shown, the composite fairing is installed onto the assembly fixture from top to bottom. The composite fairing is initially positioned by the positioning steps and protrusions of the base. Then, the fairing fixing screws 26 are installed to fix the fairing to the base. After the epoxy resin has cured, rivets are installed to fix the metal adapter ring to the composite fairing. Before installing the rivets, epoxy resin is applied to the contact surfaces of the rivets, the composite fairing, and the metal adapter ring.

[0033] After the epoxy resin at the rivets has cured, remove the clamping block, install the fluororubber sealing gasket onto the upper surface of the metal adapter ring, install the top cover, support the top cover using the support block of the auxiliary positioning seat, tighten the fixing screws to fix the top cover, and connect the air tube 24 to the test port of the top cover. Figure 8 As shown, a pressure gauge 25 is installed on the trachea.

[0034] Connect the air hose to an external air source and introduce compressed air for an airtightness test. Control the pressure at 0.2 MPa, and after the pressure gauge reading stabilizes, stop the compressed air input. Maintain the pressure for 10 minutes, observe and record the pressure gauge reading. If the pressure is not lower than 0.17 MPa after 10 minutes, the airtightness meets the requirements and the product is qualified; otherwise, the product is unqualified.

[0035] After the airtightness test is completed, remove the fixing screws, top cover, rubber gasket, and fairing fixing screws, lift the composite fairing upwards, and remove it from the assembly fixture.

[0036] To improve the airtightness test results, in an optional embodiment, an installation groove 18 can be formed along the axial direction of the support base in the side wall of the support base. The installation groove is open 19 on the side near the lower end of the support base and closed on the side near the upper end of the support base, forming a heating chamber in the side wall of the support base. A heater 20 is installed in the heating chamber. A wire hole 21 is provided on the base, through which the heater cable passes and is connected to an external power source. To further ensure the sealing integrity of the entire test chamber under heating conditions, a bottom sealing ring 22 is provided between the support base and the base. Preferably, a high-temperature resistant fluororubber sealing ring is used, which has excellent heat resistance and chemical stability, can effectively withstand the thermal stress caused by internal temperature rise, prevent heat loss or leakage of the detection medium, and thus maintain a stable test pressure and temperature field during heating and heat preservation.

[0037] In the above embodiments, the realism and accuracy of airtightness testing are further improved, effectively simulating the verification of sealing reliability under complex working conditions. Specifically, an installation groove with one open end and one closed end is opened along the axial direction inside the side wall of the support base, thereby constructing a sealed heating chamber inside, in which the heater is installed. This built-in design allows the heat source to fit tightly against the support structure of the fairing, and the heat is evenly and controllably transferred to the fairing and metal adapter ring assembly under test through the support base and the top base, realizing the temperature control of the fairing. At the same time, the heater cable is led out through a specially set cable hole on the base and connected to an external power supply. This design not only ensures the standardization and safety of electrical connections, but also avoids interference from external wiring to tooling operation and sealing surfaces.

[0038] This embodiment, through the collaborative design of "built-in heating chamber - wiring hole - high-temperature sealing ring," achieves controllable heating of the fairing assembly in the assembled state, building upon existing tooling. It simulates the temperature variations the fairing might experience during actual flight or storage, thus more realistically reflecting the impact of material thermal expansion and connector thermal stress on sealing performance during the testing phase, and exposing potential heat-induced leakage risks in advance. Combined with the previously mentioned through-type testing channel, this solution upgrades static airtightness testing to dynamic operating condition simulation testing coupled with "temperature-pressure," significantly improving the rigor of the test and the reliability of the results, providing more comprehensive verification of the product's sealing safety in real-world environments.

[0039] In a further embodiment, to simulate the vibration environment experienced by an aircraft during flight during airtightness testing, this fixture can also integrate a vibration excitation function. Specifically, an electric or piezoelectric vibration generator can be integrated and installed at the bottom or inside of the base, with its control and power supply cables connected to an external vibration controller and power supply via wiring holes on the base. Preferably, the installation position of the vibration generator is determined through modal analysis to ensure that its excitation force can be effectively and uniformly transmitted to the clamped fairing through the rigid transmission path of base-support-top. This embodiment, combined with the aforementioned heating function, constitutes a powerful environmental simulation testing platform.

[0040] During the sealing test, the heater can be activated first to uniformly heat the fairing assembly to a preset operating temperature and maintain stability, simulating aerodynamic heating or external thermal radiation environments. Subsequently, a vibration generator is activated to apply mechanical vibrations of a specific frequency and amplitude, simulating structural vibrations caused by engine operation or aerodynamic turbulence. Under this combined thermal-vibration load environment, the fairing's composite material body, metal transition ring, and the sealing interface between them will experience a stress state highly similar to actual operating conditions.

[0041] The above-mentioned scheme upgrades airtightness testing from static pressure holding tests to dynamic "environmental stress screening" tests. Any potential leakage defects caused by mismatch in the thermal expansion coefficients of materials, changes in the preload of connectors, or fatigue of sealing materials will be triggered and exposed in advance in this enhanced test, greatly improving the depth of pre-shipment condition assessment and providing crucial assurance for the development of highly reliable spacecraft.

[0042] This invention features a rationally designed structure. From the base at the bottom, the support base and top seat in the middle, to the auxiliary positioning seat and top cover at the top, each functional module can be flexibly combined using detachable methods such as screws. This not only facilitates processing, transportation, and maintenance, but also allows for quick adjustment or replacement of corresponding modules according to the size, angle, and interface specifications of different fairings, achieving tooling universality and reducing tooling costs for multi-variety production. Simultaneously, the base and top cover, together with sealing components, reliably seal the upper and lower ends of the fairing. The test port on the top cover, the through hole in the auxiliary positioning seat, and the hollow structure of the top seat form a through channel for airtightness testing without disassembly, seamlessly connecting the assembly and testing processes. This avoids damage to positioning accuracy caused by repeated disassembly and assembly, ensuring product quality.

[0043] Furthermore, the inclined mounting surface design of the support base allows the tooling to precisely preset the fairing assembly angle. The circumferentially spaced and finely adjustable auxiliary positioning seats provide uniform and stable multi-point flexible clamping for the metal adapter ring. The introduction of a detachable handrail on the side of the base enhances the ergonomics and convenience of operating large tooling. In summary, this invention systematically solves the problems of traditional tooling's single function, poor adaptability, cumbersome operation, and difficulty in ensuring accuracy, from overall layout to detailed structure, effectively improving fairing assembly accuracy and testing efficiency.

[0044] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A composite fairing assembly airtightness testing fixture, characterized in that, include The base is used to support the bottom of the fairing and to provide axial and axial restraint for the fairing. The base and the fairing are sealed at the bottom. A support base is installed on the upper side of the base, and a top base is detachably installed on the top of the support base; An auxiliary positioning seat is detachably installed on the upper side of the top seat to position and support the metal adapter ring. The top cover is detachably installed on the upper side of the auxiliary positioning seat to press the upper end face of the metal adapter ring and achieve upper sealing; in addition, the top cover is provided with a test port, the auxiliary positioning seat is provided with a through hole corresponding to the test port, and the top seat is provided with a hollow structure corresponding to the test port.

2. The composite fairing assembly airtightness testing fixture according to claim 1, characterized in that: The outer wall of the base is provided with a positioning step, and a positioning protrusion is provided on the positioning step corresponding to the slot of the fairing.

3. The composite fairing assembly airtightness testing fixture according to claim 2, characterized in that: The base is detachably fitted with a handrail, which is located below the positioning step.

4. The composite fairing assembly airtightness testing fixture according to claim 3, characterized in that: The connecting parts at both ends of the handrail are fixed to the base with screws.

5. A composite fairing assembly airtightness testing fixture according to claim 3 or 4, characterized in that: The handrail has an upward bend.

6. The composite fairing assembly airtightness testing fixture according to claim 1, characterized in that: The support base has an inclined mounting surface, and the top seat is mounted inclinedly on the mounting surface.

7. The composite fairing assembly airtightness testing fixture according to claim 1, characterized in that: The support base is provided with a flange at the bottom, and the flange is fixed to the base with screws.

8. The composite fairing assembly airtightness testing fixture according to claim 1, characterized in that: The top seat is fixed to the upper surface of the support seat by screws.

9. The composite fairing assembly airtightness testing fixture according to claim 1, characterized in that: Several auxiliary positioning seats are spaced apart along the circumference of the metal transition ring. Each auxiliary positioning seat includes a support block installed on the top seat, and a clamping block is detachably installed on the support block by screws.

10. A method for performing airtightness testing of composite fairing assembly using the tooling described in any one of claims 1 to 9, characterized in that, Includes the following steps: Assembly fixtures for assembling and fitting the composite fairing to be tested. Apply epoxy resin evenly to the outer surface of the metal adapter ring, then use the auxiliary positioning seat to clamp and fix the metal adapter to the fairing, and put the composite fairing into the assembly fixture from top to bottom. The composite fairing is axially positioned by the positioning steps of the base, and circumferentially positioned by the positioning protrusions of the base. Install the fairing fixing screws to fix the fairing to the base. After the epoxy resin has cured, use rivets to fix the metal adapter ring to the composite fairing; remove the clamping block of the auxiliary positioning seat. Install the fluororubber sealing gasket onto the upper surface of the metal adapter ring, install the top cover, support the top cover with the support block of the auxiliary positioning seat, tighten the fixing screws to fix the top cover, and connect the air tube to the test port of the top cover, and install a pressure gauge on the air tube. The trachea is connected to an external air source for airtightness testing; After the airtightness test is completed, remove the fixing screws, top cover, rubber gasket, and fairing fixing screws, lift the composite fairing upwards, and remove it from the assembly fixture.

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