76-11-02
 ALL  ú ú N01 Page 520 ú Jun 18/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
CONTROL STAND - MAINTENANCE PRACTICES
_____________________________________
 1.  General
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 A.  This procedure has many tasks which you can use individually or together. These tasks supply the electrical isolation of and access for the removal, installation, and adjustment of the control stand components that follow:
 (1)  
Thrust lever assemblies and switches

 (2)  
Autothrottle servomotor generator, gearbox, and brake assembly

 (3)  
Reverse thrust lever interlock actuators

 (4)  
Light for the fuel control switch.

 (5)  
Engine start module

 (6)  
STAB TRIM indicators

 (7)  
Microswitch pack assembly

 (8)  
Speed brake lever assembly and switches

 (9)  
Flap lever assembly and flap lever rotational variable displacement transformer (RVDT)

 B.  These tasks included can possibly give the instructions for the
 deactivation of the flight control or engine control systems to which
 each of these components is connected. Thus, the warnings that follow
 are given to identify the related safety problems to complete the tasks.

 (1)  
The parking brake is released when you push the brake pedals to the stops. If the parking brake is accidentally released when there are no chocks on the wheels, injury to persons or damage to equipment can occur.

 (2)  
Do the deactivation of the flight compartment seats. If the deactivation procedure is not done, the accidental operation of the flight compartment seat can cause injury to persons or damage to equipment.

 (3)  
The thrust reverser is operated when you set the reverse thrust lever to the reverse thrust position. Do the deactivation procedure of the thrust reverser for ground maintenance during the removal, installation, or adjustment of the components that follow: thrust lever assembly, thrust lever switches, autothrottle servomotor, brake assembly, microswitch pack assembly, or interlock actuators of the reverse thrust lever. If the deactivation procedure is not done, the accidental operation of the thrust reverser can cause injury to persons or damage to equipment.

 (4)  
Make sure to open the circuit breakers for the applicable engine ignition before you open the circuit breakers, ENG FUEL CONT VALVE, or put the fuel control toggle switches to the RUN position. If you do not open the circuit breakers, it can cause the igniter plugs to automatically fire if or when the airplane is in one of the conditions that follow: flaps are out of zero detent, nacelle anti-ice is ON, con ignition switch is set to ON, or engine start switch is pulled to ON. With fuel, which is not burned, in the combustion chamber, an internal engine or tailpipe fire can occur and cause injury to persons or damage to the engine.

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 76-11-03
 ALL  ú ú N02 Page 201 ú Jun 18/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
(5)  
Do the deactivation procedure of the autothrottle servomotor/brake assembly. The autothrottle servomotor/brake assembly can move the thrust levers from the forward idle position to the full forward thrust position in five seconds. If the deactivation procedure is not done, the accidental operation of the autothrottle servomotor/brake assembly can occur and cause injury to persons or damage to equipment.

 (6)  
Do the deactivation procedure for the interlock actuators of the reverse thrust lever. The interlock actuator operates in less than one second. If the deactivation procedure is not done, the accidental operation of the interlock actuator can occur and cause injury to persons or damage to equipment.

 (7)  
Do the deactivation procedure for the spoiler/speedbrake control system. If the deactivation procedure is not done, the accidental spoiler movement can cause injury to persons.

 (8)  
Do the deactivation procedure of the flaps for ground maintenance. If the deactivation procedure is not done, the accidental flap operation can cause injury to persons or damage to equipment.

 TASK 76-11-03-982-131-N00
　
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