KR200393583Y1 - Downlock pin warning system - Google Patents

Abstract

The aircraft has a landing gear to support the aircraft on the ground, which temporarily inserts safety pins in the landing gear to prevent them from being folded into the aircraft due to human error or system malfunction on the ground. Storing in a locker is the normal procedure. However, if you forget to remove the safety pins from the landing gear and store them in the storage box and take off the aircraft, that is, if the safety pins are stuck in the landing gear, the landing gear will not enter the aircraft and the aircraft will return to its starting point. Occurs.

To improve this, install ① proximity switch sensor that can identify the safety pin storage in the existing safety pin storage box and ② install the identification circuit device without the safety pin .

The warning circuit is generated only when the safety pin is not stored in the takeoff condition of the aircraft, providing a warning message, warning sound and warning light to the pilot, and correcting the warning before taking off (inserting the safety pin into the storage box) to prevent problems and economic loss due to return. can.

Description

    Safety pin not stored warning device {DOWNLOCK PIN WARNING SYSTEM}

 1. The landing gear of the aircraft exits from the ground to support the aircraft, but after takeoff it is intended to enter the aircraft to reduce resistance. However, if a pilot or mechanic is absent or overhauled on an aircraft that stays on the ground, a safety pin is inserted in the folded part to prevent the aircraft's landing gear from being folded due to human error or malfunction of the aircraft system. This is not intended but is intended to prevent the landing gear from being folded. It is normal for safety pins to be removed prior to flight, i.e. before flight, and stored in a designated storage box (typically, cockpit, electrical / electronic equipment compartment or cargo compartment) on board the aircraft. That's why mechanics and pilots are required to keep and check safety pins before leaving the aircraft. However, even if the safety pin is stolen and double checked, it is inevitable that a human error will occur if the aircraft is started with the safety pin inserted. 2. If taking off with safety pin inserted, a. Landing gear cannot enter the aircraft, The pilot causes confusion because something else is causing the landing gear problems (because there is no system that tells the pilot that the safety pin is inserted). C) with the landing gear down, flight cannot continue due to drag and flight restrictions; The important thing is to get back to the airport where you have taken off, you have to reduce the landing weight, and you have to throw that much fuel off the sea. 3. Economic loss of aircraft return caused by the mistake of a person who does not keep safety pins a. Huge fuel loss, b. (C) delays due to return and refueling cause continuous delays on the next connection; (C) shortening of aircraft parts life, which is a function of increasing aircraft uptime, rising labor costs for personnel, and rising ground support costs; (B) indirect losses due to passenger service complaints; It is estimated that the amount will be billions of won due to other direct and indirect cost loss, etc. In addition, reversal caused by the failure to remove the safety pins is a significant burden on the mechanic and the pilot. 4. Even if the mechanic and pilot double check the preservation and checking of the safety pin before flight, human error is inevitable and cannot be guaranteed. This design is the third. Even if the aircraft is to be departed without storage, the following systems provide the pilot with a warning message, warning sound and warning light to correct this warning before takeoff. 5. Conventional Technology Existing Safety Pin Storage Box The safety pin (Downlock or Ground Pin) is provided with a box-type safety pin storage box in a suitable space such as cockpit, electric / electronic maintenance car, and cargo compartment according to airline convenience. See Figure 1.

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 1. Landing Gear Normal Operation Procedures Before explaining the illustration of the landing gear entering the aircraft after the aircraft has taken off the runway, explain the role of the name. Landing Gear Landing Gear Actuator: An operator who pulls a landing gear into the aircraft. Drug Strut: The role of the aircraft and the landing gear in transverse support and landing gear. Down Lock Upper Linkage and Lower Linkage: Move Pivot Points A, B, and D to the centripetal point, which is overcentered at point B. Downlock Actuator: Actuator acts as an overcenter when pushing the linkage and releases an overcenter when pulling. Downlock (Ground) Pin: When pilots or mechanics stay on the ground for long periods of time, or when maintenance is performed, it prevents the downlock actuator from releasing the overcentered linkage due to human error or malfunction of the aircraft system. In other words, if the downlock pin is inserted into pivot point C, the landing gear cannot enter the aircraft in any case because the points B and C are fixed and there is no center of gravity where the linkage can be released. Figure 2 shows the aircraft supporting the aircraft with its landing gear on the ground. In addition, the downlock linkage is overcentered and the pin is inserted in the downlock pin hole. If the aircraft takes off in this state, the landing gear may never enter the aircraft. Therefore, the downlock pin must be stowed before takeoff. Figure 3 shows that the downlock pin is normally removed after take-off, the downlock actuator pulls the linkage, and the linkage that has been overcentered is released from the pivot point B, so that the landing gear actuator does not interfere with the pulling operation, and the landing gear actuator pulls the landing gear. Entering into the aircraft, the Drug Strut bends and guides the landing gear smoothly. This is the normal working drawing of the landing gear. However, if you forget the safety pin inserted in Pivot Point C of the landing gear and take it off, as mentioned above, the points B and C of the Upper Linkage and Lower Linkage are fixed and there is no center of gravity so the Downlock Actuator cannot solve the overcentered linkage. As shown in Fig. 3, the landing gear is normally folded and cannot enter the aircraft, and the landing gear keeps the support status as shown in Fig. 2. The problem is that the landing gear does not enter the aircraft.

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1. Improved Downlock Pin Storage Box The improved safety pin storage box installs a device that can identify whether the safety pin is stored in the safety pin storage box. Note: 1. There may be several devices for identifying safety pins. In this example, an insertion slot is made in the box, and a proximity switch (PROXIMITY SWITCH SENSOR) is attached around the insertion slot to identify whether the pin is inserted / detached. This signal is connected to the warning system to provide information to the pilot. 2. There is a method of installing the identification device in the safety pin insertion hole of the landing rescue device, but it is excluded here because of the complexity of the circuit connection, the increase in the weight, and the occurrence of defects due to external factors. See Figure 4. 2. Circuit Conditions See Figure 5. DOWNLOCK PIN PROXIMITY SWITCH SENSOR: Detect whether the safety pin is inserted in the storage box. (1) Note: Safety pins are equipped with safety pin lockers in appropriate spaces such as cockpits, electronic maintenance compartments, and cargo compartments for convenience of airlines. I. ENGINE RUN: An input signal generated when a pilot or mechanic runs an aircraft engine. (3) c. FLIGHT PLAN: Input signal when pilot enters origin and destination into flight data computer. (4) d. TAXI OR IRS SPEED: Input signal (1 <SPEED <60 KTS) sent by the aircraft wheel or gyro when the aircraft starts moving. (5) e. DOOR ALL CLOSE: Input signal sent when all aircraft doors are closed. (6) f. DOWNLOCK PIN CARD OR UNIT: CARD or UNIT. (10) identifying the safety pin unstored condition. Warning unit: A unit that generates a warning when the conditions of A. ~ B. Are met. (14) Note: A beep or warning light may be installed outside the aircraft, but additional installation and expense will be incurred. Ah. DISPLAY UNIT, VOICE WARN SPEAKER, MASTER WARNING & CAUTION LIGHT: Device that notifies the pilot of a warning in the warning unit (15) (16) (17) Notes: 1. Can be installed outside the aircraft, but additional installation and cost increase. 2. Warning message-"NO TAKEOFF", warning voice-"DOWNLOCK PIN", warning light-"orange". The signals for the above paragraphs B. to E. are already used as the input signal system for all aircraft systems, and the warning units in section 4 and the devices in section H are already installed on the aircraft. Here, the PROXIMITY SWITCH SENSOR device (1) is provided in the safety pin storage box of section A. and the safety pin is not stored in the port. 3. Circuit Description Then, the circuit of the following safety pin non-storage warning system will be described (Fig. Engine started to start the aircraft (3) and signal input to "AND GATE" (9) without safety pin. I. The pilot inputs all flight data such as starting point and destination to the flight computer to start the aircraft, and then executes (EXECUTE) action (4) and signal input status to "AND GATE" (9) without safety pin. When the aircraft moves, a movement is detected on the wheel axle or gyro (5), and a signal input status is present in the "AND GATE" (9) without the safety pin. la. All doors are closed to start the aircraft (6) and signal input status in "AND GATE" (9) without safety pin. hemp. All safety pins are inserted in the storage box (8), and no safety pins are stored. There is no signal in "AND GATE" (9) .A. ~ E. Since the safety pins are all inserted into the storage box, the safety pin non-storage warning device is a normal situation without warning. If, don't. If any safety pin is not inserted in the protest box, the generated signal is input to "OR GATE" (8) and this signal is input to "AND GATE" (9). Already in " AND GATE " If the signal for the departure of the protest aircraft is on hold and a signal is input that no one safety pin is inserted, the "AND GATE" (9) is satisfied and the signal is sent to the warning unit (14) and the warning from the unit is a warning message to the pilot. Will be sent to screen (15), warning voice speaker (16) and warning light (17). Therefore, Locker safety pin insertion (O) / Takeoff condition (X) / Warning (X) Locker safety pin insertion (X) / Takeoff condition (X) / Warning (X) Locker safety pin insertion (O) / Takeoff condition (O) / Warning (X) It is a circuit structure that inserts safety pins (X), take-off condition (O) and warning (O) .

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 As a result, the mechanic or pilot forgets to remove the safety pin from the landing gear and puts it in the improved safety pin storage box. Correcting before (inserting the safety pin in the box) can prevent problems and economic losses from returning.

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  FIG. 1 is a drawing of a conventional safety pin storage box. FIG. 2 is a drawing of a landing gear supporting an aircraft with a safety pin inserted from the ground. FIG. 3 is a drawing of a safety pin being normally removed from a landing gear while the aircraft is taking off. 4 is an improved safety pin storage drawing. FIG. 5 is a safety pin without warning circuit.

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Claims (1)

In the safety pin non-storage warning device, the safety pin storage box (2) has a built-in proximity switch (1) in the safety pin insertion hole to detect whether or not the safety pin is stored by the safety pin insertion contact, and the safety pin CARD or UNIT (10) is input at engine start-up. The engine start signal (3) to be input, the flight plan execution signal (4) inputted at the time of execution (EXECUTE) after the pilot inputs all flight plans from the flight computer, the aircraft movement signal (5) inputted when the aircraft moves, When all the doors of the aircraft are closed, the door closing signal (6) inputs the aircraft departure status signal to the "AND GATE" circuit (9), and when the proximity damper (7) detects that any of the safety pins are not stored, "OR GATE". The signal of the "circuit 8" is input to the "AND GATE" circuit 9 to generate a safety pin non-stored signal, and the warning unit 14 is a safety pin non-storage input signal. (12) and the warning light ground switch (13) DISPLAY UNIT (15) to show the pilot a "NO TAKEOFF" warning message, a warning voice speaker (16) to give the pilot a "NO TAKEOFF" warning sound, and a "orange" warning light to the pilot. Safety pin not stored warning device, characterized in that consisting of a warning light (17). .