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22-24-00
ALL ú ú 03 Page 9 ú Mar 20/90
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757 MAINTENANCE MANUAL
MACH TRIM/SPEED STABILITY SYSTEM - ADJUSTMENT/TEST
__________________________________________________
1. General_______
A. This procedure gives the system test for the Mach Trim/Speed Stability System. It is necessary to use external test equipment for the system test. This test examines the interfaces between the equipment in the Mach Trim/Speed Stability System.
TASK 22-24-00-735-008
2. System Test - Mach Trim/Speed Stability System______________________________________________
A. References
(1)
24-22-00/201, Electrical Power - Control
(2)
27-41-00/501, Horizontal Stabilizer Trim Control System
(3)
27-51-00/201, Trailing Edge Flap System
(4)
27-61-00/201, Spoiler/Speedbrake Control System
(5)
29-11-00/201, Pressurize/Depressurize Main Hydraulic System
(6)
31-41-00/501, Engine Indication and Crew Alerting System
(7)
32-09-02/201, Air/Ground Relays
(8)
34-11-00/201, Pitot-Static System
(9)
34-12-00/501, Air Data Computing System
B. Access
(1)
Location Zones
119/120 Main Equipment Center
211/212 Flight Compartment
(2)
Access Panel
119BL Main Equipment Center
C. Prepare for the System Test
S 865-009
(1)
Supply electrical power (Ref 24-22-00).
S 285-010
(2)
Make sure that these systems operate correctly:
(a)
Horizontal Stabilizer Trim Control System (Ref 27-41-00).
(b)
Air/Ground Relays (Ref 32-09-02)
(c)
Air Data Computing System (Ref 34-12-00).
(d)
Engine Indication and Crew Alerting System (EICAS) (Ref 31-41-00).
(3)
Make sure the control column is at its neutral position.
S 285-011
NOTE: Do not hold the control column.
____
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
22-24-00
ALL ú ú 01 Page 501 ú Dec 20/95
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757
MAINTENANCE MANUAL
S 845-012
(4) If a fault ball is set or if an overhead panel light comes on during the tests, do one of the steps that follow:
(a) Open and close these circuit breakers on the P11 overhead circuit breaker panel: 1) 11C8, CSEU 2L AC
or FLT CONT ELEC 2L AC
2) 11G17, CSEU 1R AC
or
FLT CONT ELEC 1R AC
3) 11G27, CSEU 2R AC
(b) Push the RESET switch on each SAM.
S 865-016
(5) The RESET switch on the front panel of the SAM sets all of the fault balls. If there is a failure, the fault ball sets to yellow after you release the RESET switch.
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.
(a) Do the deactivation procedure for the spoilers or move all persons and equipment away from the spoilers (Ref 27-61-00).
WARNING: DO THE DEACTIVATION PROCEDURE FOR FLIGHT MODE SIMULATION
_______ BEFORE YOU OPEN THE AIR/GROUND CIRCUIT BREAKERS. WHEN YOU OPEN THE AIR/GROUND CIRCUIT BREAKERS THE AIRPLANE IS IN FLIGHT MODE. IN FLIGHT MODE, MANY OF THE AIRPLANE SYSTEMS CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
(b) Do the deactivation procedure for flight mode simulation (Ref 32-09-02).
S 865-017
(6) Open these circuit breakers on the power distribution panel, P6, and attach DO-NOT-CLOSE tags:
(a) 6L15, PITOT HEAT CAPT MAIN
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