A method for alarming ejection seat safety pins

Abstract

This invention belongs to the field of aircraft system design technology and relates to an ejection seat safety pin alarm method. A microswitch is installed on the central pull ring support of the ejection seat to output the position signal of the central pull ring safety pin on the seat. A safety pin support with a microswitch is placed inside the aircraft cockpit to output the position signal of the central pull ring safety pin on the support. By collecting the safety pin position signal, logical judgment is performed with the canopy status, landing gear status, brake status, and throttle lever status signals. The judgment result is sent to the alarm system to trigger an ejection seat safety pin alarm. This invention is used to issue an alarm signal when the pilot forgets to insert or remove the central pull ring safety pin, reminding the pilot to perform the appropriate operation and improving safety.

Description

Technical Field

[0001] This invention belongs to the field of aircraft system design technology and relates to a method for warning of ejection seat safety pins. Background Technology

[0002] To ensure safety during use and maintenance, a safety pin is installed on the center pull ring of the ejection seat. This safety pin is removed before the aircraft taxis out and reinserted after landing before the pilot exits the cabin. Currently, the pilot usually inserts and removes the safety pin himself, which presents a problem: if the pilot forgets to insert or remove the safety pin, the seat may eject unexpectedly in an emergency if ejection cannot be initiated immediately or during exit. Therefore, the aircraft should issue a warning signal to remind the pilot if he or she forgets to insert or remove the safety pin. Summary of the Invention

[0003] The purpose of this invention:

[0004] The purpose of this invention is to provide an ejection seat safety pin alarm method, which issues an alarm signal when the pilot forgets to insert or remove the safety pin of the center pull ring of the seat, reminding the pilot to perform the corresponding operation and improving safety.

[0005] The technical solution of this invention:

[0006] An ejection seat safety pin alarm method involves installing a microswitch on the central pull ring support of the ejection seat to output a position signal of the central pull ring safety pin on the seat; placing a safety pin support with a microswitch inside the aircraft cockpit to output a position signal of the central pull ring safety pin on the safety pin support; and collecting the position signal of the safety pin and performing logical judgment with the canopy status, landing gear status, brake status, and throttle lever status signals, and sending the judgment result to the alarm system to trigger an ejection seat safety pin alarm.

[0007] Furthermore, the ejection seat safety pin alarm methods include a seat safety pin not inserted alarm method, a seat safety pin not removed alarm method, and a seat safety pin position not identifiable alarm method.

[0008] The method for triggering the seat safety pin not engaged warning is as follows:

[0009] The microswitch on the central pull ring support of the ejection seat did not output a signal indicating the position of the central pull ring safety pin on the seat. The aircraft was in the landing state and the canopy was open. The electromechanical management computer output an alarm signal indicating that the seat safety pin was not inserted.

[0010] Seat safety pin not pulled alarm method:

[0011] When the aircraft is detected to have begun to taxi, if the safety pin support in the aircraft cockpit does not output a signal indicating the position of the central pull ring safety pin on the safety pin support, the electromechanical management computer will output a seat safety pin not pulled alarm signal.

[0012] When the aircraft is identified as being in a ground test mode, the electromechanical management computer does not output a seat safety pin not pulled alarm signal;

[0013] Seat safety pin position cannot be identified alarm method:

[0014] When the system detects that the center seat safety pin is neither on the seat nor on the support, the electromechanical management computer outputs a "seat safety pin" alarm.

[0015] Furthermore, the electromechanical management computer outputs a warning signal for a seat safety pin not being inserted.

[0016] Furthermore, the warning signals for uninserted seat safety pins in the front and rear cabins are displayed independently to avoid unnecessary alarms during single-cabin flights.

[0017] Furthermore, the seat safety pin not pulled alarm signal output by the electromechanical management computer is a warning level signal.

[0018] Furthermore, an aircraft is in a taxiing state when the following conditions are met simultaneously:

[0019] (1) The landing gear is in the ground position and is valid;

[0020] (2) The canopy is not locked, therefore invalid;

[0021] (3) The stop brake is ineffective;

[0022] (4) The throttle lever angle is greater than 18 degrees.

[0023] Furthermore, an aircraft is considered to be in test mode when it simultaneously meets the following conditions:

[0024] (1) The landing gear is in the ground position and is valid;

[0025] (2) The canopy is not locked, therefore invalid;

[0026] (3) The stop brake is effective;

[0027] (4) The throttle lever angle is greater than 18 degrees.

[0028] Furthermore, the warning displays for seat safety pin malfunctions in the front and rear cabins are independent of each other, avoiding unnecessary alarms during single-cabin flights.

[0029] Furthermore, the electromechanical management computer outputs a "seat safety pin" alarm signal as an attention-level signal.

[0030] The beneficial effects of this invention are:

[0031] This invention proposes an ejection seat safety pin alarm method. By identifying the position signal of the safety pin in the center pull ring of the seat, it comprehensively judges whether the safety pin is in the appropriate position. If the requirement is not met, an alarm signal is issued, reducing the probability of errors and improving the safety of ejection seat use and maintenance. The seat safety pin alarm logic design of this invention has been applied to a certain type of advanced trainer aircraft and is also applicable to other aircraft models, possessing high promotional value. Attached Figure Description

[0032] Figure 1 This is a flowchart of the method for triggering a seat safety pin not inserted warning.

[0033] Figure 2 This is a flowchart of the method for triggering the seat safety pin not being removed alarm;

[0034] Figure 3 This is a flowchart of the alarm method for when the seat safety pin position cannot be identified. Detailed Implementation

[0035] One embodiment of the present invention is as follows: The technical solution of the present invention is to install a microswitch on the central pull ring support of the ejection seat to output a position signal of the central pull ring safety pin on the seat; and to place a safety pin support with a microswitch in the aircraft cockpit to output a position signal of the central pull ring safety pin on the safety pin support. By collecting the position signal of the safety pin, logical judgment is performed with signals such as the canopy status, landing gear status, brake status, and throttle lever status, and the judgment result is sent to the alarm system. Specific logic includes a seat safety pin not inserted alarm method, a seat safety pin not removed alarm method, and a seat safety pin position not recognized alarm method.

[0036] The method for triggering the seat safety pin not engaged warning is as follows:

[0037] If the microswitch on the ejection seat's central pull ring support fails to output a signal indicating the position of the central pull ring safety pin on the seat, and the aircraft is in a landed position with the canopy open, the electromechanical management computer will output a seat safety pin not inserted warning signal (warning level). Separate warning signals for seat safety pin not inserted are displayed for the front and rear cabins to avoid unnecessary alarms during single-cabin flights.

[0038] Seat safety pin not pulled alarm method:

[0039] When the aircraft is detected to have begun taxiing, if the safety pin support in the cockpit does not output a signal indicating the position of the central pull ring safety pin on the safety pin support, the electromechanical management computer will output a seat safety pin not pulled warning signal (warning level). The aircraft is detected to have begun taxiing when the following conditions are met simultaneously: the landing gear is in a valid landing position and the cockpit canopy is unlocked and ineffective, the stop brake is ineffective, and the throttle lever angle is greater than 18 degrees.

[0040] When the aircraft is identified as being in ground test mode, the electromechanical management computer will not output a seat safety pin not pulled alarm signal (warning level). The aircraft is identified as being in ground test mode when the following conditions are met simultaneously: the landing gear is in a valid ground position, the canopy is unlocked and ineffective, the stop brake is active, and the throttle lever angle is greater than 18 degrees.

[0041] The warning displays for seat safety pins not being removed in the front and rear cabins are independent, avoiding unnecessary alarms during single-cabin flights.

[0042] Seat safety pin position recognition alarm method: To prevent pilots from pulling the center pull ring safety pin from the seat without inserting it into the cockpit safety pin bracket, that is, when the system detects that the center pull ring safety pin is neither on the seat nor in the bracket, the electromechanical management computer outputs a "seat safety pin" alarm (attention level).

[0043] The seat safety pin not inserted alarm method, the seat safety pin not removed alarm method, and the seat safety pin position recognition alarm method can only perform logical judgment when the aircraft landing gear is in the ground state, that is, when the aircraft is on the ground. Therefore, in order to prevent the microswitch from outputting incorrect signals due to vibration or malfunction during flight, and assuming that the pilot will not insert the center ring safety pin back into the seat after removing it from the seat on the ground, no alarm will be issued in the air.

[0044] The second embodiment of the present invention is:

[0045] When the ejection seat safety pin of a certain type of aircraft is inserted into the center pull ring, the signal is valid when the pin is inserted into the seat and invalid when it is pulled out. Similarly, when the center pull ring safety pin is inserted into the cockpit safety pin bracket, the signal is valid when the pin is inserted into the bracket and invalid when it is pulled out. The cockpit canopy is closed and locked using the "canopy unlocked" signal. The difference between ground testing and aircraft taxiing lies in the braking system status; during ground testing, the aircraft is in a stop braking state, while before taxiing, it switches to normal braking. The landing gear landing status is used to determine if the aircraft is in the air. This type of aircraft is twin-engine; when taxiing, if the throttle lever angle is greater than 18°, the aircraft is considered to be preparing to taxi when either the left or right engine throttle lever angle is greater than 18°. Therefore, the alarm logic for the seat safety pin of this type of aircraft is as follows:

[0046] 1. When the landing gear is in the ground position, the canopy is unlocked, and the seat safety pin insertion signal is invalid, a "seat safety pin not inserted" alarm (warning level) will be issued.

[0047] 2. When the landing gear is in the ground position, the cockpit canopy is unlocked and ineffective, the stop brake is ineffective, the angle of any throttle lever is greater than 18°, and the safety pin insertion signal is valid, a "seat safety pin not removed" alarm (warning level) will be issued.

[0048] 3. When the safety pin insertion signal is invalid and the safety pin insertion support signal is invalid, a "seat safety pin" alarm (caution level) will be issued.

[0049] This invention identifies the position signal of the center pull ring safety pin on the seat and comprehensively judges whether the safety pin is in the correct position. If the requirement is not met, an alarm signal is issued, reducing the probability of errors and improving the safety of ejection seat use and maintenance. The seat safety pin alarm logic design of this invention has been applied to a certain type of advanced trainer aircraft and is also applicable to other aircraft models, possessing high potential for widespread adoption.

Claims

1. A method for alarming the safety pin of an ejection seat, characterized in that, A microswitch is installed on the central pull ring support of the ejection seat to output the position signal of the central pull ring safety pin on the seat; a safety pin support with a microswitch is placed in the aircraft cockpit to output the position signal of the central pull ring safety pin on the safety pin support. By collecting the position signal of the safety pin, logical judgment is made with the canopy status, landing gear status, brake status, and throttle lever status signals, and the judgment result is sent to the alarm system to trigger an ejection seat safety pin alarm. Ejection seat safety pin alarm methods include seat safety pin not inserted alarm method, seat safety pin not removed alarm method, and seat safety pin position cannot be identified alarm method; The method for triggering the seat safety pin not engaged warning is as follows: The microswitch on the central pull ring support of the ejection seat did not output a signal indicating the position of the central pull ring safety pin on the seat. The aircraft was in the landing state and the canopy was open. The electromechanical management computer output an alarm signal indicating that the seat safety pin was not inserted. Seat safety pin not pulled alarm method: The aircraft is in taxiing state when the following conditions are met simultaneously: (1) the landing gear is in the ground position; (2) the cockpit canopy is not locked; (3) the stop brake is not working; (4) the throttle lever angle is greater than 18 degrees. When the aircraft is detected to be starting to taxi, the safety pin support in the aircraft cockpit does not output the position signal of the central pull ring safety pin on the safety pin support, and the electromechanical management computer outputs the seat safety pin not pulled alarm signal. The aircraft is in test mode when the following conditions are met simultaneously: (1) the landing gear is in the ground test mode; (2) the canopy is unlocked; (3) the stop brake is effective; (4) the throttle lever angle is greater than 18 degrees. When the aircraft is identified as being in ground test mode, the electromechanical management computer does not output a seat safety pin not pulled alarm signal. Seat safety pin position cannot be identified alarm method: When the system detects that the center seat safety pin is neither on the seat nor on the support, the electromechanical management computer outputs a "seat safety pin" alarm.

2. The ejection seat safety pin alarm method according to claim 1, characterized in that, The electromechanical management computer outputs a warning signal indicating that the seat safety pin is not inserted.

3. The ejection seat safety pin alarm method according to claim 1, characterized in that, The warning signals for uninserted seat safety pins in the front and rear cabins are displayed independently to avoid unnecessary alarms during single-cabin flights.

4. The ejection seat safety pin alarm method according to claim 1, characterized in that, The alarm signal output by the electromechanical management computer indicating that the seat safety pin has not been removed is a warning signal.

5. The ejection seat safety pin alarm method according to claim 1, characterized in that, The warning displays for seat safety pins not being removed in the front and rear cabins are independent, avoiding unnecessary alarms during single-cabin flights.

6. The ejection seat safety pin alarm method according to claim 1, characterized in that, The electromechanical management computer outputs a "seat safety pin" alarm signal, which is a warning signal.

Images