(2)
These are the procedures of the system test of the yaw damper system:
(a)
CMC Interface Test
(b)
Power Up Test
(c)
Power Supply Interface Test
(d)
28 Volt DC Power Test
(e)
Yaw Damper Engage Test
(f)
Air/Ground System Interface Test
(g)
Hydraulic Interface Test
(h)
ADC Interface Test
(i)
IRU Interface Test
(j)
Accelerometer Interface Test
B. References
(1)
AMM 11-17-03/201, 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 34-21-00/201, Inertial References System
(6)
AMM 34-61-00/501, Flight Management Computer System
(7)
AMM 34-61-02/401, Control Display Unit
(8)
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 865-258
(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).
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
(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 Overhead 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 865-089
(1)
Supply the electrical power (AMM 24-22-00/201).
S 865-133
(2)
Align the left, center and right IRUs in the NAV mode
(AMM 34-21-00/201).
S 865-138
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.
(3)
Supply the hydraulic pressure to the hydraulic systems No. 2 and No. 3 (AMM 29-11-00/201).
S 865-136
(4)
Make sure the FLT CONTROL HYD POWER TAIL 2 and 3 switches are in the NORM position. These switches are on the Pilots' Overhead Maintenance Panel (P461).
S 865-087
(5)
Push and release the engage switch of the upper yaw damper (P5) to engage the upper yaw damper system. Make sure that the ON annunciator comes on and the INOP annunciator is off.
S 865-088
(6)
Push and release the engage switch of the lower yaw damper (P5) to engage the lower yaw damper system. Make sure that the ON annunciator comes on and the INOP annunciator is off.
F. CMC Interface Test
S 745-039
(1) Do this task for the upper and lower yaw dampers: Ground Test - Yaw Damper.
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