INDEX NO. 1 PART NAME DIM. BOLT BUSHING ID OD (mm) DESIGN LIMITS DIAMETER INCHES MINIMUM (mm) MAXIMUM INCHES 0.2485 (6.312) 0.2495 (6.337) 0.2500 0.2505 (6.363)(6.350) (mm) PERMITTED DIMENSION INCHES WEAR WEAR LIMITS (6.236) 0.2455 0.2545 (6.464) (mm) MAXIMUM DIAMETER CLEARANCE INCHES 0.0050 (0.127) PART WORN REPLACE X X PART WORN REPAIR REPAIR INSTR
2 BUSHING BOLT OD ID (6.312) 0.2485 0.2500 (6.350) 0.2495 (6.337) 0.2505 (6.363) (6.464) 0.2545 (6.464) 0.2545 0.0050 (0.127) X X
3 BEARING BOLT ID OD 0.2495 (6.337) 0.2500 (6.350) 0.24950.2485 (6.312) (6.337) (6.464) 0.2545 0.2450 (6.223) 0.0050 (0.127) X X
4 BUSHING BUSHING ID OD 0.3750 (9.525) 0.3740 (9.500) 0.3756 (9.540) 0.3745 (9.512) (9.665) 0.3805 (9.413) 0.3706 0.0050 (0.127) X X
5 BUSHING BOLT ID OD 0.3125 (7.938) 0.3110 (7.899) 0.3131 (7.953) 0.3120 (7.925) (8.052) 0.3170 (7.826) 0.3081 0.0050 (0.127) X X
6 BEARING BOLT ID OD 0.3120 (7.925) 0.3110 (7.899) 0.3125 (7.938) 0.3120 (7.925) (8.052) 0.3170 0.3075 (7.811) 0.0050 (0.127) X X
7 BUSHING BOLT ID OD 0.3125 (7.938) 0.3110 (7.899) 0.3130 (7.950) 0.3120 (7.925) 0.3170 (8.052) (7.823) 0.3080 0.0050 (0.127) X X
8 BUSHING BUSHING ID OD (11.087) 0.4365 (11.100) 0.4375 (11.113) 0.4382 (11.130) 0.4370 (11.003) (11.227) 0.4420 0.4332 0.0050 (0.127) X X
Aileron Wear Limits
Figure 601 (Sheet 3)
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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757 MAINTENANCE MANUAL
AILERON POSITION INDICATING SYSTEM - DESCRIPTION AND OPERATION
______________________________________________________________
General
_______
A. The aileron position indicating system provides the flight crew with
visual indication of aileron angular displacement.Component Details (Fig. 1)
_________________
A. Flight Control Surface Position Indicator_________________________________________
(1) The flight control surface position indicator is displayed on the status page of the lower EICAS screen. The indicator shows the position of the ailerons, rudder, and elevators.
B. Aileron Position Transmitter____________________________
(1) The position transmitters are accessible through panels on the wing lower surface. Adjustable control rods attach the transmitters to the ailerons. The transmitter is rigged to electrical zero when the aileron is faired with wing structure.
Operation
_________
A. Functional Description______________________
(1) When the aileron deflects, it drives the control rod which provides an electrical signal in the transmitter. The voltage is proportional to the amount of aileron movement. The EICAS computer receives the signal and displays aileron position when the status button is pressed. Two pointers indicate aileron position separately.
B. Control_______
(1)
Aileron position indicating is automatic when power is on. Both left and right bus power supplies the system when the AILERON POS circuit breakers L and R are closed.
(2)
To display aileron position indicator, press STATUS button on pilot's select display panel P9.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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757
MAINTENANCE MANUAL
SEE B
SEE A
POSITION
TRANSMITER
WING
REAR
SPAR ELECTRICAL ZERO SEE A INDEX MARKS
CONTROL ROD
AILERON
FWD INBD
A
LC R
HYD QTY 0.76 O/FULL 0.25 RF
APU EGT 640 CABIN ALT AUTO 1
CARGO FAN
OXY PRESS 1750 SEE C
B
RUD
AILERON
POSITION
AIL ELEV AIL INDICATION
LOWER EICAS DISPLAY UNIT
C
Aileron Position Indicating System Figure 1
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