(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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31-26-12 Page 504 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. Jun 20/90
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).
(1)
Retard associated thrust lever to idle stop.
(2)
Place protractor with adapter on associated thrust lever and set protractor to 0 degree.
(3)
Connect ohmmeter across terminals C and NO of switch (either set of two sets of terminals) and check that switch is not actuated (no continuity through switch).
(4)
Advance associated thrust lever until switch actuates (continuity through switch). Check that thrust lever is 12.5 +1 degrees forward of idle stop.
(5)
If switch does not actuate at correct thrust lever position, adjust position of switch actuating cam.
(6)
Remove ohmmeter and connect electrical wiring to switch terminals.
D. Test warning switch.
(1)
Provide electrical power.
(2)
Provide system A hydraulic power (Ref 27-62-0 MP).
(3)
Check that following circuit breakers on panel P6 are closed:
(a)
AURAL WARNING
(b)
EPR WARNING
(c)
LANDING GEAR LIGHTS
(d)
ENG NO. 1 EPR & L.G. WARNING
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Oct 20/92 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 31-26-22 Page 401
H23705
Thrust Lever Actuated Switch Installation 507
31-26-22Page 402 Figure 401 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. Aug 15/77
(e) ENG NO. 2 EPR & L.G. WARNING
(4)
Retard both thrust levers to idle stop.
(5)
Make sure the flaps are in a non-takeoff configuration:
(a) Set the flap control lever at zero units.
(6)
Place protractor on associated thrust lever and set protractor to 0 degree.
(7)
Press and hold associated engine EPR test switch on engine accessory module. Check that warning horn does not sound.
(8)
Advance associated thrust lever and check that intermittent horn sounds when thrust lever is 12.5 +1 degrees forward of idle stop.
(9)
Retard thrust lever and check that horn sound stops when thrust lever is 5 degrees (minimum) forward of idle stop.
(10)
Release EPR test switch and retard thrust lever to idle stop.
E. Restore airplane to normal.
(1)
Remove system A hydraulic power (Ref 27-62-0).
(2)
Remove electrical power if no longer required.
(3)
Remove protractor from thrust lever.
507
Feb 01/96 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 31-26-22 Page 403
FLAP TAKEOFF WARNING SWITCH - REMOVAL/INSTALLATION
1. General
A. The flap take off warning switch (S130) is the center switch installed on the flap control unit (Fig. 401). The switch leads make a single wire bundle and must be separated during switch removal, and retied when a new switch is installed.
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