22-32-02
ALL ú ú 01 Page 404 ú Mar 20/90
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757 MAINTENANCE MANUAL
MICROSWITCH PACK - MAINTENANCE PRACTICES
________________________________________
TASK 22-32-04-002-057
1. Remove the Microswitch Pack Assembly____________________________________
A. General
(1)
The microswitch pack assembly is attached to the bottom of the autothrottle clutch pack and cable quadrant frame. Access to the microswitch assembly is through access panel 113AL for the forward equipment bay (AMM 06-41-00/201).
(2)
A check of all the microswitches must be done after any microswitch pack assembly removal and installation. The switches are attached to movable mounting arms that can be adjusted to position the switches for correct activation (open/close points).
To adjust the switches, you push down on the locking channel, which releases the adjusting bolt, and turn the adjusting bolt as necessary to correctly position the switch. You then continue to turn the adjusting bolt the minimum amount necessary to allow the locking channel to rise and lock the bolt in position.
B. References
(1)
AMM 06-41-00/201, Section 41 Access Doors and Panels
(2)
AMM 27-61-00/201, Spoiler/Speedbrake Control System
(3)
AMM 78-31-00/201, Thrust Reverser System
C. Access
(1)
Location Zones
113/114 Area Forward of NLG Wheel Well
211/212 Flight Compartment
(2)
Access Panel 113AL Flight/Landing Gear/Engine Control Components
D. Prepare For Removal
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
22-32-04
ALL ú ú 01 Page 201 ú Jun 20/97
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757 MAINTENANCE MANUAL
S 862-002
WARNING: DO THE DEACTIVATION PROCEDURE FOR THE SPOILERS OR MOVE ALL
_______ PERSONS AND EQUIPMENT AWAY FROM THE SPOILERS. THE SPOILERS CAN RETRACT QUICKLY AND CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
(1)
Do the deactivation procedure for the spoilers (Ref 27-61-00) or move all persons and equipment away from the spoilers.
S 862-003
(2)
Open these circuit breakers on the overhead panel, P11 and attach DO-NOT-CLOSE tags:
(a)
11F15, TMC DC
(b)
11G11, AUTO SPEED BRAKE
(c)
11S21, AUTOBK ANTISKID TEST IND 2
S 862-004
WARNING: DO THE DEACTIVATION PROCEDURE TO PREVENT THE OPERATION OF THE
_______ THRUST REVERSER. THE ACCIDENTAL OPERATION OF THE THRUST REVERSER CAN CAUSE INJURIES TO PERSONS AND DAMAGE TO EQUIPMENT.
(3)
Do the deactivation procedure for the thrust reverser (forward thrust position) for ground maintenance (Ref 78-31-00/201).
S 012-039
(4)
Open the access panel, 113AL, for the microswitch pack
(Ref 06-41-00).
E. Remove the Microswitch Pack Assembly (Fig. 201)
S 032-081
(1)
Disconnect the electrical connectors from the microswitch assembly.
S 032-006
(2)
Remove the four bolts, washers, and nuts that hold the microswitch assembly to the autothrottle frame assembly.
(3)
Remove the microswitch pack assembly.
S 032-007
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
22-32-04
ALL ú ú 01 Page 202 ú May 28/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757
MAINTENANCE MANUAL
AUTOTHROTTLE FORWARD EQUIPMENT
DRIVE ASSEMBLY BAY ACCESS DOOR,
113AL
SEE A
(REF)
RIG PIN HOLE
CCW ROTATION/
CW ROTATION/
FWD THRUST
REV THRUST
RIG PIN
HOLE
SIDE SEE BFRAME BOLT,
MICROSWITCH
WASHER,
PACK ASSEMBLY
NUT AFT (4 LOCATIONS)
CAM ELECTRICAL
POINTER CONNECTORS
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