(4)
The operational test of the manual/electric stabilizer trim switches
(5)
The operational test of the elevator actuated cutout switches
(6)
The operational test of the stabilizer trim cutout switches
(7)
The Stabilizer Trim Single Switch Test
(8)
The system test of the stabilizer trim control system
(9)
The operational test of the stabilizer trim hydraulic brakes.
TASK 27-41-00-745-001
2. Existing Faults Check - Stabilizer Trim/Rudder Ratio Control Module
___________________________________________________________________
A. General
(1)
This task is a check which makes sure that the CMCS did not make a record of the existing faults with the left or right SRM.
B.
References
(1)
AMM 24-22-00/201, Manual Control
(2)
AMM 45-10-00/201, Central Maintenance Computer System
(3)
SSM 27-41-05
(4)
WDM 45-32-21
C.
Access
(1)
Location Zone
221 Control Cabin, LH
222 Control Cabin, RH
D.
Procedure
S 865-002
(1)
Do this task: "Supply Electrical Power" (AMM 24-22-00/201).
S 745-004
(2)
Look for the stabilizer trim/rudder ratio module faults (AMM 45-10-00/201):
(a)
Push the key for <EXISTING FAULTS on the CMC menu.
(b)
Push the key for <27 STABILIZER TRIM on the existing faults menu.
NOTE: If the <27 STABILIZER TRIM does not show, there are no
____ existing faults with the two SRMs.
(c) Make sure that there are no SRM - L or SRM - R faults on the CDU.
S 865-006
(3) If the electrical power is not necessary, do this task: "Remove Electrical Power" (AMM 24-22-00/201).
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
TASK 27-41-00-715-007
3. Operational Test - Stabilizer Trim Control System_________________________________________________
A. General
(1)
This task is an operational test of the stabilizer trim control system. During the test, it is necessary to monitor the stabilizer position indicators to make sure the stabilizer is free to move. Refer to AMM 22-22-00/501 for the operational test of autopilot functions. To do this test you must do the checks of these components:
(a)
The operational test of the alternate stabilizer trim switches is in paragraph 4.
(b)
The operational test of the manual/electric stabilizer trim switches is in paragraph 5.
(c)
The operational test of the elevator actuated cutout switches is in paragraph 6.
(d)
The operational test of the stabilizer trim cutout switches is in paragraph 7.
TASK 27-41-00-715-087
4. Operational Test - Alternate Stabilizer Trim Switches_____________________________________________________
A. References
(1)
AMM 24-22-00/201, Manual Control
(2)
AMM 29-11-00/201, Main Hydraulic Supply System
B.
Access
(1)
Location Zone
221 Control Cabin, LH
222 Control Cabin, RH
C.
Procedure
S 865-008
(1) Do this task: "Supply Electrical Power" (AMM 24-22-00/201).
S 865-057
WARNING: MAKE SURE THAT PERSONS AND EQUIPMENT ARE CLEAR OF ALL CONTROL
_______ SURFACES BEFORE YOU SUPPLY HYDRAULIC POWER. AILERONS, RUDDERS, ELEVATORS, FLAPS, SPOILERS, LANDING GEAR, AND THRUST REVERSERS CAN MOVE QUICKLY WHEN YOU SUPPLY HYDRAULIC POWER. THIS CAN CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
(2)
Do this task to pressurize the hydraulic systems No. 2 and No. 3: "Supply Hydraulic Power" (AMM 29-11-00/201).
S 715-073
(3)
Do this test of the alternate stabilizer trim switch:
(a)
Set the STAB TRIM 3 switch on the control stand to ON and the STAB TRIM 2 switch to CUTOUT.
