(10)
Pull to unlock, then set and hold LE warning OVERRIDE TEST switch (S785, E3-2 shelf) to OVERRIDE position. Warning horn continues to sound and No. 1 and 4 LE FLAP EXTEND lights at P5-12 LE annunciator panel come on (green).
(11)
Extend flaps to FLAPS 1 position. Horn stops. Return OVERRIDE TEST switch to center position.
(12)
Extend flaps to FLAPS 25 position. Horn remains silent and No. 1 and 4 LE FLAP EXTEND green lights remain on at LE annunciator panel.
(13)
Pull to unlock, then set and hold LE warning test switch (S784 E3-2 shelf) to L LE TEST position. Warning horn sounds and No. 1 LE FLAP EXTEND green light on LE annunciator panel goes out. Return test switch to NORMAL position. Horn stops and No. 1 LE FLAP EXTEND green light comes on.
(14)
Pull to unlock, then set and hold test switch to R LE TEST position. Warning horn sounds and No. 4 LE FLAP EXTEND green light goes out at LE annunciator panel. Return test switch to NORMAL position. Horn stops an No. 4 LE FLAP EXTEND green light comes on.
(15)
Extend flaps to not less than FLAPS 30 position. Horn sounds at or before FLAPS 30 position and remains sounding thru any greater position. Retract flaps to FLAPS 25 position. Horn stops and remains silent through FLAPS 1 position.
(16)
Pull to unlock, then set and hold LE warning OVERRIDE TEST switch (S785) to OVERRIDE position. Retract flaps to FLAPS O position. Horn sounds and all LE FLAPS EXTEND green lights go out except No. 1 and 4.
(17)
Return OVERRIDE TEST switch to center position. Horn continues to sound and No. 1 and 4 LE FLAP EXTEND green lights go out. Extend flaps to FLAPS 1 position. Horn stops and LE FLAPS EXTEND green lights come on.
(18)
Return switches to center position.
(19)
Return flaps to normal positions, or as required.
(20)
Close circuit breakers previously opened.
(21)
Airplanes with EPR activated take-off warning system; Close the ENG NO. 1 EPR AND LG WARNING and ENG NO. 2 EPR AND LG WARNING circuit breakers.
501
May 01/00 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 31-26-0 Page 531
G. Restore Airplane to Normal
(1)
Return speed brakes to down, stabilizer to green band range and flaps to takeoff range, if required.
(2)
On airplanes incorporating SB 31-1059, set parking brake and restore interconnect valve as follows:
(a)
Place ground interconnect valve manual override lever to position 1 (closed).
(b)
Reconnect electrical connector to ground interconnect valve.
(c)
Close ground interconnect valve circuit breaker on P6 panel.
(d)
Set parking brake.
(e)
Place ground interconnect switch to close position.
(f)
Check that valve manual override lever is in position 1 (closed).
(3)
Retard thrust levers to idle stop.
(4)
Remove hydraulic power, if no longer required (Ref 27-51-0).
(5)
Remove electrical power, if no longer required.
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31-26-0 Page 532 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. May 01/98
THRUST LEVER ACTUATED LANDING GEAR WARNING SWITCHES - REMOVAL/INSTALLATION
1. General
A. The thrust lever actuated landing gear warning switches S139 and S140 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.
2. Equipment and Materials A Ohmmeter B Airplane Control Surfaces Protractor - F52485-500
C. Protractor Adapter (Thrust Lever) - F72952-2
3. Remove Thrust Lever Actuated Landing Warning Switch (Fig. 401)
A. Open circuit breakers LANDING GEAR LIGHTS and ANTI-SKID FAIL WARN & PARK BRAKE on panel P6.
B. Disconnect electrical wiring from switch terminals.
C Remove switch mounting bolts and remove switch from support.
D Remove switch actuator from switch.
4. Install Thrust Lever Actuated Landing Gear Warning Switch (Fig. 401)
A. Install switch actuator on switch.
B. Place switch in position on support and install mounting bolts.
C Adjust warning switch.
(1)
Retard associated thrust lever to idle stop.
(2)
Install protractor with adapter on thrust lever and set protractor to 0 degree.
(3)
Advance thrust lever 20 degrees minimum from idle stop.
(4)
Connect ohmmeter across terminals C and NC of switch and check that switch is not actuated (no continuity through switch).
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