Ground debugging device and method for ram air turbine assembly

Abstract

The invention discloses a ground debugging device and method for a ram air turbine assembly, relates to the field of debugging equipment for the ram air turbine assembly, and aims to solve the technical problems that in the prior art, the debugging structure of the ram air turbine assembly is complex, and the precision control difficulty is high. The debugging device comprises a bearing box body, an oil tank is arranged in the bearing box body, the oil tank is connected with a hydraulic oil supply birdmouth and a pressure relief birdmouth of the assembly to be debugged through a pressure pump and a hose on the pressure pump, and a stop valve is arranged on the hose. According to the debugging method, the device is used, and the rising and falling function of the ram air turbine is tested by operating the stop valve. The device and method are independent of an aircraft hydraulic system, more flexible debugging work is achieved, meanwhile, the requirement for operators is lowered, and fine adjustment is achieved.

Description

Technical Field

[0001] The present invention relates to the field of debugging equipment for ram air turbine components. Specifically, the present invention provides a ground debugging device and method for a ram air turbine component. Background Art

[0002] The ram air turbine assembly can be released in an emergency, using the oncoming airflow of the aircraft to drive the turbine to rotate at high speed, converting air energy into electrical energy to provide emergency power for the aircraft. The opening / closing of its cabin door also depends on the release and recovery control of the ram air turbine assembly. After the ram air turbine assembly is installed, it needs to be installed and debugged to check its system retraction function and the installation gap with the cabin of the fuselage structure, which is an important process of aircraft assembly integration.

[0003] The ground commissioning of the ram air turbine assembly uses the aircraft hydraulic source to provide hydraulic pressure for the retracting and extending cylinder of the ram air turbine assembly. The ground commissioning of the ram air turbine assembly generally requires the cooperation of three operators. Operator A squats under the floor of the front cargo compartment in the aircraft cabin and is responsible for operating the retracting and extending control valve control handle. Operator B stands on the ground near the cabin where the ram air turbine assembly is located, observes its retraction process, reports abnormal conditions, and adjusts the spring length of the retracting and extending cylinder. Operator C coordinates operators A and B and issues instructions to continue retracting, holding, and releasing.

[0004] (1) Collapse process Operator A places the retractable control valve in the recovery position to control the retraction of the ram air turbine assembly. Operator B observes the retraction process. If there is an abnormal emergency (such as collision or jamming), he / she immediately reports to operator C and asks operator A to stop retracting. Operator B checks whether the clearance between the ram air turbine assembly and the cabin top structure meets the requirements. If not, adjust the spring length of the retractable actuator and perform retraction debugging again until the clearance requirements are met.

[0005] (2) Stop process During the stowage process, it is necessary to check whether the turbine locking pin is inserted into the turbine stop groove, so the stowage needs to be stopped. When the ram air turbine assembly is stowed into the cabin and before reaching the stowed position, operator B requests to stop stowing, and operator A places the stowage control valve control handle in the stop position, and the ram air turbine assembly stops stowing.

[0006] (3) Release process Release the electromagnetic lock of the retractable actuator. Operator A puts the retractable control valve in the release position to control the ram air turbine assembly to be lowered. Operator B checks whether the ram air turbine assembly release process is smooth, without sticking, and is released in place.

[0007] Use the aircraft hydraulic source to perform ram air turbine assembly retraction and extension commissioning.

[0008] At present, the debugging method of using the aircraft hydraulic source to perform the ram air turbine assembly retraction and deployment debugging inspection on the ground has the following problems: 1. When installing and debugging the ram air turbine assembly, the aircraft hydraulic system is required to provide hydraulic power for the ram air turbine assembly to be retracted and extended. The installation and debugging of the ram air turbine assembly is limited by the integrity and functional integrity of the aircraft hydraulic system.

[0009] 2. During the installation and commissioning of the ram air turbine components, three people are required to work together in different work areas. There are many uncontrollable factors and quality and safety risks.

[0010] 3. The installation and commissioning of the ram air turbine assembly uses the onboard hydraulic system, which has high hydraulic pressure and unadjustable flow, making it difficult to accurately control the retraction and extension process. Summary of the invention

[0011] The object of the present invention is to provide a ram air turbine assembly ground debugging device and method, so as to overcome the problems of complex debugging structure and high control accuracy difficulty of the ram air turbine assembly in the prior art.

[0012] To achieve the above purpose, the technical solution adopted by the present invention is as follows: A ground debugging device for a ram air turbine assembly includes a bearing box, which serves as the outer shell of the entire debugging device, provides structural support and protects internal components. An oil tank is arranged in the bearing box, and the oil tank is connected to a pressure pump. One end of the pressure pump is connected to the oil tank through a ball valve, and the other end is connected to the hydraulic oil supply socket and the pressure relief socket of the assembly to be debugged through a hose when the debugging device is working. Hydraulic oil is stored in the oil tank as a hydraulic oil source, which is used to supply oil to the ram air turbine when it is retracted, and to recover oil when the ram air turbine is released. The pressure pump pumps the hydraulic oil out of the oil tank and pressurizes it to provide the required hydraulic power for the test of the ram air turbine assembly; the ball valve controls the on-off of the oil circuit between the pressure pump and the oil tank, and is installed on the pipeline between the oil tank and the pressure pump to facilitate the cutting off of the oil circuit during maintenance and overhaul. When any component in the system needs to be overhauled, the ball valve can be closed to prevent the hydraulic oil from flowing out of the oil tank.

[0013] The pressure pump extracts the hydraulic oil from the oil tank and sends it to the subsequent pipeline. The pumping rate of the pressure pump can affect the flow rate of the hydraulic oil in the pipeline. The pressure pump is installed and fixed on the bearing box to ensure that the system is stable and reliable when the hand pressure handle on the pressure pump is shaken, and no shaking occurs. The hose connecting the pressure pump to the hydraulic interface of the debugged component includes an oil supply hose and an oil return hose, and the oil supply hose is arranged with an oil supply valve, and the oil return hose is arranged with an oil drain valve; the oil supply hose serves as a hydraulic oil delivery channel to transmit the pressurized hydraulic oil to the component to be debugged; the oil return hose serves as a hydraulic oil reflux channel to transmit the return oil of the component to be debugged back to the oil tank. The oil supply valve and the oil drain valve serve as stop valves to adjust and control the flow of hydraulic oil when testing the ram air turbine component.

[0014] A one-way valve and a filter are also arranged between the oil supply hose and the pressure pump. The one-way valve ensures that the hydraulic oil can only flow in one direction, prevents backflow, and ensures that the oil flows in the correct direction. The filter filters impurities in the hydraulic oil to keep the oil clean and prevent pollution. The filter is installed in a conspicuous position inside the bearing box for easy regular replacement.

[0015] Furthermore, a pressure gauge is arranged on the oil supply hose to display the hydraulic oil pressure in the oil supply hose, which is convenient for monitoring the system pressure and ensuring the safety of the debugging process.

[0016] Furthermore, the oil supply valve, oil drain valve and pressure gauge are arranged on the upper part of the carrying box body. There is a protruding part on the upper part of the carrying box body, and one side of the protruding part is an inclined surface with a certain inclination angle. The oil supply valve, oil drain valve and pressure gauge are arranged on this surface, which is convenient for pressure observation and shut-off valve operation.

[0017] Furthermore, the oil tank is also provided with an oil drain port and an oil refueling port. The oil drain port is directly installed at the bottom of the oil tank. When the equipment is not used for a long time, the hydraulic oil in the oil tank can be released through the oil drain port. The oil refueling port is installed at the top of the oil tank to facilitate the replenishment of hydraulic oil into the oil tank.

[0018] Furthermore, a hose reel is arranged in the bearing box, and the oil supply hose and the oil return hose can be wound on the hose reel when not in use. The reel design is adopted to facilitate the storage of the hose. When the hose needs to be connected to the hydraulic interface of the ram air turbine retractable actuator for debugging, the side lock of the bearing box is opened, and the hose is stretched out to connect with the hydraulic interface. A chassis drain valve is arranged at the lower part of the bearing box. When hydraulic oil accumulates at the bottom of the box, it can be discharged through the chassis drain valve. Casters are also installed at the bottom of the bearing box to make the bearing box easy to move, thereby improving the maneuverability and portability of the equipment.

[0019] A ram air turbine assembly ground debugging method, the method is implemented based on the above-mentioned ram air turbine assembly ground debugging device, the debugging method comprises the following steps: S1, connect the oil supply hose and the oil return hose to the hydraulic oil supply socket and the pressure relief socket of the component to be debugged respectively; S2, turn on the oil supply valve, close the oil drain valve, use the pressure pump to supply pressure to the pipeline, and the ram air turbine begins to retract. After the retraction is completed, close the oil supply valve, stop supplying pressure, and observe the retraction status of the ram air turbine; S3, adjust the ram air turbine to the release state, keep the oil supply valve connected, turn on the oil drain valve to achieve pipeline pressure relief, the ram air turbine begins to lower, and observe the release state of the ram air turbine.

[0020] Further, after adjusting the ram air turbine to the released state, before connecting the oil supply valve and the oil drain valve, the ram air turbine should not be able to be directly lowered under the action of gravity.

[0021] Furthermore, when adjusting the ram air turbine to the released state, the electromagnetic lock of the ram air turbine needs to be unlocked on board.

[0022] Furthermore, the fuel supply valve is closed during the retraction of the ram air turbine to observe whether the ram air turbine remains in the current position.

[0023] Furthermore, the fuel supply valve is closed during the ram air turbine release process to observe whether the ram air turbine remains in the current position.

[0024] Compared with the prior art, the present invention has the following beneficial technical effects: A ground debugging device for a ram air turbine assembly provides a solution with a compact structure, easy operation and high control accuracy to address the problems of complex debugging structure and high control accuracy in the prior art. The device integrates key components such as an oil tank, a pressure pump, an oil supply valve, an oil drain valve, a one-way valve, a filter and a pressure gauge into a bearing box, which significantly simplifies the equipment and connections required for debugging and reduces the complexity of the debugging process. In addition, the design of the hose reel, chassis oil drain valve and casters in the device enhances the portability and maintenance convenience of the equipment. Overall, the debugging device improves the safety, efficiency and reliability of the debugging process, while reducing the dependence on the aircraft hydraulic system, making the debugging work more flexible and independent. In addition, only one operator is required to complete the retraction and extension control of the ram air turbine assembly and the monitoring of its debugging process, and no longer requires the collaboration of multiple people.

[0025] A method for ground debugging of a ram air turbine assembly, using the above debugging device, by accurately controlling the state of the oil supply valve and the oil drain valve, realizes fine adjustment of the action of the ram air turbine assembly, thereby overcoming the technical problem of high control accuracy difficulty in the prior art. The method allows the operator to complete the folding, holding and releasing actions of the assembly through simple valve operation, greatly improving the efficiency and accuracy of debugging. At the same time, through real-time monitoring of the pressure gauge, the operator can accurately control the pressure of the hydraulic oil to ensure the safety of the debugging process. In addition, the debugging method uses a ground debugging device independent of the aircraft system, is no longer limited by the integrity and functional integrity of the aircraft hydraulic system, can be carried out when the aircraft hydraulic system is not working or unavailable, and improves the flexibility and adaptability of debugging. In general, the debugging method uses an external debugging device to debug the ram air turbine, and the ground debugging device can be placed near the ram air turbine cabin, no longer requiring multiple people to collaborate in debugging work, simplifies the operation process, reduces safety risks, and improves the controllability and reliability of debugging. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0027] Figure 1 It is a front view of a ground debugging device for a ram air turbine assembly according to an embodiment of the present invention.

[0028] Figure 2 It is a side view of a ground debugging device for a ram air turbine assembly according to an embodiment of the present invention.

[0029] Figure 3 This is a hydraulic principle diagram of a ground debugging device for a ram air turbine assembly in an embodiment of the present invention.

[0030] Figure 4 The figure is a flow chart of a ground debugging method for a ram air turbine assembly according to an embodiment of the present invention.

[0031] In the figure, 1. caster; 2. chassis oil drain valve; 3. pressure pump; 4. oil tank; 5. filter; 6. load-bearing box; 7. oil supply valve; 8. pressure gauge; 9. oil drain valve; 10. check valve; 11. hose reel; 12. oil tank drain port; 13. oil tank refill port; 14. ball valve. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, 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 the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0034] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "set / connected", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0035] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "several" is two or more, unless otherwise clearly and specifically defined.

[0036] Embodiment 1: like Figures 1 to 3As shown, in a specific embodiment of the present invention, a ground debugging device for a ram air turbine assembly is provided, including a bearing box 6, the bearing box 6 serves as the outer shell of the entire debugging device, provides structural support and protects internal components, and an oil tank 4 is arranged in the bearing box 6, the oil tank 4 is connected to a pressure pump 3, one end of the pressure pump 3 is connected to the oil tank 4 through a ball valve 14, and the other end is connected to the hydraulic oil supply socket and the pressure relief socket of the component to be debugged through a hose when the debugging device is working. Hydraulic oil is stored in the oil tank 4 as a hydraulic oil source, which is used to supply oil to the ram air turbine when it is folded, and to recover oil when the ram air turbine is released. The interior of the oil tank 4 adopts a corrosion-resistant design, and can store type IV, class I phosphate-based flame-retardant hydraulic oil that meets the requirements of AS1241C for a long time. The pressure pump 3 pumps the hydraulic oil out of the oil tank 4 and pressurizes it to provide the required hydraulic power for the test of the ram air turbine assembly; the ball valve 14 controls the on-off of the oil circuit between the pressure pump and the oil tank, and is installed on the pipeline between the oil tank 4 and the pressure pump 3 to facilitate cutting off the oil circuit during maintenance and overhaul. When any component in the system needs to be overhauled, the ball valve 14 can be closed to prevent the hydraulic oil from flowing out of the oil tank 4.

[0037] In this embodiment, a hand pump is used as the pressure pump 3. The hydraulic oil is extracted from the oil tank 4 and sent to the subsequent pipeline by manually shaking the hand handle on the pressure pump 3. The shaking rate of the pressure pump 3 can affect the flow rate of the hydraulic oil in the pipeline.

[0038] The pressure pump 3 is mounted and fixed on the bearing box 6 to ensure that the system is stable and reliable when the hand pressure handle on the pressure pump 3 is shaken, and no shaking occurs. The hose connecting the pressure pump 3 and the hydraulic interface of the debugged component includes an oil supply hose and an oil return hose, and the oil supply hose is provided with an oil supply valve 7, and the oil return hose is provided with an oil drain valve 9; the oil supply hose serves as a hydraulic oil delivery channel to transmit pressurized hydraulic oil to the component to be debugged; the oil return hose serves as a hydraulic oil return channel to transmit the return oil of the component to be debugged back to the oil tank 4. The oil supply valve 7 and the oil drain valve 9 serve as stop valves to adjust and control the flow of hydraulic oil when testing the ram air turbine component.

[0039] A one-way valve 10 and a filter 5 are also arranged between the oil supply hose and the pressure pump 3. The one-way valve 10 ensures that the hydraulic oil can only flow in one direction, prevents backflow, and ensures that the oil flows in the correct direction. The filter 5 filters impurities in the hydraulic oil to keep the oil clean and prevent pollution. The filter 5 is installed in a conspicuous position inside the bearing box 6 for easy regular replacement.

[0040] Preferably, a pressure gauge 8 is also arranged on the oil supply hose in this embodiment to display the hydraulic oil pressure in the oil supply hose, so as to facilitate monitoring of the system pressure and ensure the safety of the debugging process.

[0041] Preferably, the oil supply valve 7, oil drain valve 9 and pressure gauge 8 in this embodiment are arranged on the upper part of the carrying box 6. There is a protruding part on the upper part of the carrying box 16, and one side of the protruding part is an inclined surface with a certain inclination angle. The oil supply valve 7, oil drain valve 9 and pressure gauge 8 are arranged on this surface to facilitate pressure observation and shut-off valve operation.

[0042] Preferably, the oil tank 4 in this embodiment is also provided with an oil tank drain port 12 and an oil tank refill port 13. The oil tank drain port 12 is directly installed at the bottom of the oil tank 4. When the equipment is not used for a long time, the hydraulic oil in the oil tank 4 can be released through the oil tank drain port 12. The oil tank refill port 13 is installed at the top of the oil tank 4 to facilitate the replenishment of the hydraulic oil in the oil tank 4.

[0043] Preferably, in the present embodiment, a hose reel 11 is also arranged in the bearing box 6. When the oil supply hose and the oil return hose are not in use, they can be wound around the hose reel 11. The reel design is adopted to facilitate the storage of the hose. When the hose needs to be connected to the hydraulic interface for debugging work, the side lock of the bearing box 6 is opened, and the hose is stretched out to connect with the hydraulic interface. A chassis drain valve 2 is arranged at the lower part of the bearing box 6. When hydraulic oil accumulates at the bottom of the box, it can be discharged through the chassis drain valve 2. Casters 1 are also installed at the bottom of the bearing box 6 to make the bearing box easy to move and improve the maneuverability and portability of the equipment.

[0044] Embodiment 2: like Figure 4 As shown, in a specific embodiment of the present invention, a ram air turbine assembly ground debugging method is provided, and the method is implemented based on a ram air turbine assembly ground debugging device described in Example 1, and the ram air turbine assembly ground debugging device includes a bearing box 6, and the bearing box 6 is used as a shell of the entire debugging device to provide structural support and protect internal components. The oil tank 4 is arranged inside the bearing box 6, and the oil tank 4 is connected to the pressure pump 3. One end of the pressure pump 3 is connected to the oil tank 4 through a ball valve 14, and the other end is connected to the hydraulic oil supply of the component to be debugged through a hose when the debugging device is working. The oil tank 4 is used to store hydraulic oil as a hydraulic oil source, which is used to supply oil to the ram air turbine when it is retracted, and to recover oil when the ram air turbine is released; the hose connecting the pressure pump 3 with the hydraulic interface of the debugged component includes an oil supply hose and an oil return hose, the oil supply hose is provided with an oil supply valve 7, and the oil return hose is provided with an oil drain valve 9; the oil supply hose serves as a hydraulic oil delivery channel, and transmits pressurized hydraulic oil to the component to be debugged; the oil return hose serves as a hydraulic oil reflux channel, and transmits the return oil of the component to be debugged back to the oil tank 4; the debugging method comprises the following steps: S1, connect the oil supply hose and the oil return hose to the hydraulic oil supply socket and the pressure relief socket of the component to be debugged respectively; S2, turn on the oil supply valve 7, close the oil drain valve 9, use the pressure pump 3 to supply pressure to the pipeline, and the ram air turbine starts to retract. After the retraction is completed, close the oil supply valve 7, stop supplying pressure, and observe the retracted state of the ram air turbine; S3, adjust the ram air turbine to the release state, keep the oil supply valve 7 connected, connect the oil drain valve 9, realize pipeline pressure relief, the ram air turbine starts to be lowered, and observe the release state of the ram air turbine.

[0045] The oil supply valve 7 and the oil drain valve 9 need to be used in conjunction with each other. When the oil supply valve 7 is turned on and the oil drain valve 9 is closed, the hydraulic oil can reach the ram air turbine assembly on the aircraft along the oil supply hose. As the hand pressure handle on the pressure pump 3 is continuously shaken, the hydraulic pressure at the ram air turbine assembly continues to increase until the ram air turbine assembly overcomes its own gravity and the elastic force of its internal spring assembly and begins to retract.

[0046] During the stowage process, the oil supply valve 7 is turned off and the oil drain valve 9 is kept in the closed state, so that the ram air turbine assembly can be kept in the current position, which is used to observe the stowage of the ram air turbine assembly and confirm that there is no interference. When the ram air turbine assembly needs to be released, the oil drain valve 9 can be turned on, the oil supply valve 7 is kept in the closed state, and the oil return hose is connected to the oil supply pipeline through the oil drain valve 9, and its hydraulic oil can return to the oil tank 4. The ram air turbine assembly is released under the action of gravity.

[0047] Preferably, the folding rate of the ram air turbine assembly can be controlled by controlling the shaking rate of the hand pressure handle on the pressure pump 3. When the ram air turbine assembly is about to be folded into place, the folding speed of the ram air turbine assembly is reduced to observe whether the pin on the ram air turbine assembly is in place.

[0048] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the present invention and are not intended to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A ram air turbine assembly ground debugging device, characterized in that: It comprises a bearing box (6) in which an oil tank (4) is arranged, the oil tank (4) is connected to a pressure pump (3), one end of the pressure pump (3) is connected to the oil tank (4) via a ball valve (14), and the other end is connected to a hydraulic oil supply socket and a pressure relief socket of a component to be debugged via a hose when the debugging device is working; The hose connecting the pressure pump (3) and the hydraulic interface of the debugged component comprises an oil supply hose and an oil return hose, the oil supply hose is provided with an oil supply valve (7), and the oil return hose is provided with an oil drain valve (9); A one-way valve (10) and a filter (5) are also arranged between the oil supply hose and the pressure pump (3).

2. A ram air turbine assembly ground debugging device according to claim 1, characterized in that: A pressure gauge (8) is also arranged on the oil supply hose.

3. A ram air turbine assembly ground debugging device according to claim 2, characterized in that: The oil supply valve (7), the oil drain valve (9) and the pressure gauge (8) are arranged on the upper part of the bearing box (6).

4. A ram air turbine assembly ground debugging device according to claim 1, characterized in that: The oil tank (4) is also provided with an oil tank drain port (12) and an oil tank fill port (13).

5. A ram air turbine assembly ground debugging device according to claim 1, characterized in that: A hose reel (11) is also arranged in the bearing box (6), and the oil return hose can be wound around the hose reel (11).

6. A ram air turbine assembly ground debugging device according to claim 1, characterized in that: A chassis oil drain valve (2) is arranged at the lower part of the bearing box (6), and casters (1) are also installed at the bottom of the bearing box (6).

7. A method for ground commissioning of a ram air turbine assembly, characterized in that: The method is implemented based on a ram air turbine assembly ground debugging device as claimed in any one of claims 1 to 6, and the debugging method comprises the following steps: S1, connect the oil supply hose and the oil return hose to the hydraulic oil supply socket and the pressure relief socket of the component to be debugged respectively; S2, connect the oil supply valve (7), close the oil drain valve (9), use the pressure pump (3) to supply pressure to the pipeline, and the ram air turbine begins to retract. After the retraction is completed, close the oil supply valve (7), stop supplying pressure, and observe the retraction state of the ram air turbine; S3, adjust the ram air turbine to the release state, keep the oil supply valve (7) connected, connect the oil drain valve (9), realize pipeline pressure relief, the ram air turbine begins to be lowered, and observe the release state of the ram air turbine.

8. A ram air turbine assembly ground commissioning method according to claim 7, characterized in that: After the ram air turbine is adjusted to the released state, before the oil supply valve (7) and the oil drain valve (9) are connected, the ram air turbine should not be able to be lowered directly under the action of gravity.

9. A ram air turbine assembly ground commissioning method according to claim 7, characterized in that: When adjusting the ram air turbine to the released state, the electromagnetic lock of the ram air turbine needs to be released on the aircraft.

10. A ram air turbine assembly ground commissioning method according to claim 7, characterized in that: During the retraction process of the ram air turbine, close the oil supply valve (7) and observe whether the ram air turbine remains in the current position.

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