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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 - Unpublished Work - See title page for details.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).
(5)
Retard thrust lever until switch actuates (continuity through switch). Check that thrust lever is 5.0 degrees minimum forward of idle stop.
(6)
Advance thrust lever until switch deactivates. Check that thrust lever is 13.5 degrees maximum forward of idle stop.
(7)
If switch does not operate at correct thrust lever position, adjust tab on switch actuator arm (Fig 401) or adjust switch in mounting slots (if provided)
(8)
Remove ohmmeter and connect electrical wiring to switch terminals.
D. Test warning switch
(1) Test switch S139 or S140 (Ref 31-26-0 A/T [par. 4]).
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Jun 20/89 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 31-26-11 Page 401
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Thrust Lever Actuated Switch Installation 501
31-26-11Page 402 Figure 401 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. Jun 20/89
FLAP LANDING WARNING SWITCH - REMOVAL/INSTALLATION
1. General
A. Flap landing warning and flap limit switches are mounted on the flap control unit, located in the right wheel well.
B. The flap up limit switch is part of the flap control system and provides an input to the landing gear position and warning system as an auxiliary function. The removal/installation of the flap up limit switch is covered in Chapter 27, Flight Controls.
2. Equipment and Materials
A. Gear Ground Lockpin - F72735
3. Remove Flap Landing Warning Switch (Fig. 401)
A. Check that all gear ground lockpins are installed.
B. Open the AURAL WARNING, LIGHTS and GEAR SWITCH & ANTI-SKID TEST, circuit breakers on panel P6-2.
C. Remove cover from flap control unit.
D. Remove inner checknut from flap landing warning switch and remove switch from flap control unit.
E. Remove switch electrical leads from wire bundle up to electrical connector.
F. Disconnect electrical connector and remove landing gear warning switch pins from connector insert.
4. Install Flap Landing Warning Switch (Fig. 401)
A. Insert flap landing warning switch in place in flap control unit and install inner checknut.
B. Insert switch electrical leads in wire bundle. Tie and clamp wire bundle.
C. Trim switch leads to length, install pin contacts on lead ends and install pin contacts in connector.
D. Connect electrical connector.
E. Close all circuit breakers opened in step 3.B.
F. Adjust switch (Ref Flap Landing Warning Switch - Adjustment/Test).
G. Replace cover on flap drive unit.
Nov 15/76 31-26-12 Page 401 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
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Flap Landing Warning Switch Installation 501
31-26-12 Figure 401 Nov 15/76
Page 402
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
