(2)
Simulated landing gear position may be utilized when airplane jacks are not available, or jacking airplane is not possible.
(3)
Check that external power supply is connected.
(4)
Check that all landing gear and landing gear warning system circuit breakers on circuit breaker panel P6 are closed.
(5)
Check that all gear ground lockpins are installed.
(6)
Pressurize hydraulic system A (Ref 29-11-0 MP).
C. Test Flap Landing Warning Switch
(1)
Advance both engine thrust levers to a position greater than 25 degrees above idle stop.
(2)
Remove right main gear ground lockpins. Operate override trigger and retract right main landing gear.
(3)
If landing gear position is to be simulated, simulate right main gear retracted as described below. Also simulate air mode.
(a)
Place landing gear lever in off position. Check that all red gear lights come on and green lights remain on. Warning horn remains silent.
(b)
Place a copper deactuator shield between right main gear downlock sensor s73 and steel actuator arm.
(c)
Place a steel actuator bar over right main gear uplock sensor switch s74 located beside the right main gear uplock hook.
(d)
To simulate air mode for the main landing gear, disconnect the push-pull teleflex cable from the right main gear upper torsion link. Simulate air mode by extending the cable. Reconnect cable when complete. Do not in any way overstress the cable.
CAUTION: GENTLY PULL THE TELEFLEX CABLE UNTIL THE AIR/GND SENSOR ACTIVATES. IF THE CABLE IS NOT PULLED WITH CARE THE SENSOR TARGET BRACKET CAN BE BENT AND DAMAGED.
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(4)
Extend trailing edge flaps and check that warning horn sounds at greater than 10 units (between 10 and 15 units) of flap extension and continues to sound at al1 greater flap angles.
(5)
Press horn reset button and check that horn continues to sound.
(6)
Fully retract flaps and check that horn cuts out between 10 and 15 units of flap extension and is silent at 10 units and all lesser flap angles (units).
D. Restore Airplane to Normal Configuration
(1)
Extend right main landing gear and install gear ground lockpin.
(2)
If gear position was simulated, simulate a gear extension by removing all copper deactuator shields and steel actuator bars. Return the teleflex cable to its original position.
(a) Red lights should extinguish and green lights will illuminate.
(3)
Determine if there is further need for electrical power on airplane, if not, disconnect electrical power.
(4)
Determine if there is further need for hydraulic power on airplane; if not, remove System A hydraulic power (Ref 29-11-0).
(5)
Lower airplane and remove jacks (Ref Chapter 7, Jacking Airplane).
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THRUST LEVER ACTUATED TAKEOFF WARNING SWITCHES - REMOVAL/INSTALLATION
1. General
A. The thrust lever actuated takeoff warning switches S133 and S283 are mounted on the auto throttle clutch supports located in the electronic equipment compartment ceiling. Access to the switches is gained through the electronic equipment compartment access door. The removal/installation procedure is the same for both switches.
B. The thrust lever actuated takeoff warning switches are adjusted using angular measurements taken at the thrust levers on the control stand.
2. Equipment and Materials
A. Ohmmeter
B. Airplane Control Surfaces Protractor - F52485-500
C. Protractor Adapter (Thrust Lever) - F72952-2
Remove Thrust Lever Actuated Takeoff Warning Switch (Fig. 401)
A. Open circuit breaker EPR WARN on P6 panel.
B. Disconnect electrical wiring from switch terminals.
C. Remove switch mounting screws and remove switch from support.
D. Remove switch actuator from switch.
4. Install Thrust Lever Actuated Takeoff Warning Switch (Fig. 401)
A. Install switch actuator on switch.
B. Place switch in position on support and install mounting screws.
C. Adjust warning switch.
NOTE: The engine control system must be properly rigged prior to adjusting the switch (Ref 76-11-0 A/T).
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