22-22-00
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
TASK 22-22-00-735-017
3. System Test - Automatic Stabilizer Trim System
______________________________________________
A. General
(1)
The system test contains the procedures for each interface test of the automatic stabilizer trim system. It makes sure that the automatic stabilizer trim system operates correctly.
(2)
These are the procedures of the system test of the automatic stabilizer trim system:
(a)
SRM Valid and Unscheduled Trim Crossfeed Check
(b)
Speed Trim Engage and Valid Trim Command Crossfeed Check
(c)
Autotrim Engage ARM and CONTROL Crossfeed Check
B. References
(1)
AMM 11-17-01/201, P7 Overhead Circuit Breaker Panel
(2)
AMM 22-11-01/401, FCC Software Installation
(3)
AMM 24-22-00/201, Manual Control
(4)
AMM 29-11-00/201, Main Hydraulic Supply System
(5)
AMM 31-61-00/501, Integrated Display System
(6)
AMM 34-21-00/201, Inertial Reference System
(7)
AMM 34-61-00/501, Flight Management Computer System
(8)
AMM 34-61-02/401, Control Display Unit
(9)
AMM 45-10-00/501, Central Maintenance Computer System
C. Access
(1) Location Zone
221 Control Cabin, LH
222 Control Cabin, RH
D. Preconditions
S 865-235
(1) These conditions are necessary for this task:
(a)
Electrical Power On (AMM 24-22-00/201).
(b)
Central Maintenance Computer (CMC), serviceable (AMM 45-10-00/501).
(c)
Control Display Unit (CDU), serviceable (AMM 34-61-02/401).
(d)
Hydraulic Pressure Supplied (AMM 29-11-00/201).
(e)
IRUs must be in the NAV mode (AMM 34-21-00/201).
(f)
P7, Circuit Breaker Panel, installed (AMM 11-17-01/201).
(g)
Flight Control Computer (FCC), serviceable (AMM 22-11-01/401).
(h)
Flight Management Computer (FMC), serviceable (AMM 34-61-00/501).
E. Prepare for the System Test
S 865-048
(1) Supply electrical power (AMM 24-22-00/201).
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MAINTENANCE MANUAL
S 865-022
(2) Align the left, center and right IRUs in the NAV mode
(AMM 34-21-00/201).
NOTE:____It takes approximately 10 minutes to align the IRS. You can continue to prepare for the system test while you align the IRS.
S 865-026
(3)
Make sure the STAB TRIM 2 and 3 switches on the pilots' control stand are in the AUTO position.
S 865-027
(4)
Make sure that these amber annunciations do not show on the main EICAS display (P2-2):
-
STAB TRIM 2
-
STAB TRIM 3
-
STAB TRIM UNSCHD
S 865-158
(5)
Push the STAT button on the EICAS display select panel.
S 865-028
(6)
Make sure that these white annunciations do not show on the
auxiliary EICAS display (P2-2):
-
STAB AUTO CUTOUT
-
STAB AUTOTRIM
F. SRM Valid and Unscheduled Trim Crossfeed Check
S 865-094
WARNING: MAKE SURE THAT PERSONS AND EQUIPMENT ARE CLEAR OF ALL CONTROL
_______ SURFACES BEFORE YOU SUPPLY HYDRAULIC POWER. AILERONS, RUDDERS, ELEVATORS, FLAPS, SLATS, SPOILERS, LANDING GEAR, AND THRUST REVERSERS CAN MOVE QUICKLY WHEN YOU SUPPLY HYDRAULIC POWER. THIS CAN CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
(1) Supply hydraulic pressure to the hydraulic systems N0. 1, 2, 3 and 4 (AMM 29-11-00/201).
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