34-22-00
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A
747-400
MAINTENANCE MANUAL
Standby Compass Location
Figure 1
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34-22-00
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747-400 FAULT ISOLATION/MAINT MANUAL
STANDBY COMPASS
COMPONENT FIG. 102 SHT QTY ACCESS/AREA REFERENCE
FLT DECK LIGHT STBY INST, C1117 FLT DK LIGHTS PANEL GLARE SHIELD, C131 COMPASS - STANDBY, N100 CIRCUIT BREAKERS - 1 1 1 1 1 6L1 6E21 FLIGHT COMPARTMENT, P6 FLIGHT COMPARTMENT, P5 * * 34-22-01
* SEE THE WDM EQUIPMENT LIST
Standby Compass - Component Index
Figure 101
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 FAULT ISOLATION/MAINT MANUAL
FLIGHT COMPARTMENT
Standby Compass - Component Location
Figure 102
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747-400
MAINTENANCE MANUAL
STANDBY COMPASS - MAINTENANCE PRACTICES (COMPASS SWING)
_______________________________________________________
1. General_______
A. This procedure contains two tasks. Each task is a different procedure that you can use to do a swing of the standby compass. One procedure is to tow the airplane around a compass rose (Tow Around Procedure). The other procedure is to use a standby compass calibrator (Calibrator Procedure). Use only one of these procedures to do a swing of the standby compass.
NOTE: Air bubbles can occur in the standby magnetic compass because of temperature changes and/or decrease of fluid. Maintenance limits made for liquid quantity make sure of satisfactory compass operation. When air bubble is larger than 1/8-inch high and 3/8-inch wide, with the glass approximately vertical position, replace the standby compass.
B. Each task has two parts. The first part is to do a swing of the standby compass through four compass points (N, E, S, W). Use this procedure for compass calibration. The second part is to do a swing of the standby compass through 12 compass points that are approximately 30 degrees apart. Use this procedure to measure the remaining errors and to make sure the standby compass heading is accurate. Use this data to make the compass correction card. This card must stay with the standby compass.
C. It is not necessary to keep a constant radius or tangency during airplane tow around the compass rose or swing area. Tow direction is optional. These make no difference when you calculate the solutions.
D. Do not park vehicles less than 250 feet from the airplane during the compass swing.
E. Make sure the radio receivers are on during the compass swing.
F. You can use the APU during the compass swing.
TASK 34-22-00-822-001
2. Standby Compass Tow Around Procedure____________________________________
A. Equipment
(1)
Tow Tractor
(2)
Non-magnetic tools to adjust the standby magnetic compass.
(3)
One compass correction card - AN5823-1.
B. References
(1)
AMM 9-11-00/201, Towing
(2)
AMM 24-22-00/201, Electrical Power - Control
(3)
AMM 31-61-00/501, Integrated Display System
(4)
AMM 34-21-00/501, Inertial Reference System
C. Access
(1) Location Zones
221 Control Cabin, LH
D. Prepare for a Compass Swing of the Standby Compass 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：747-400 AMM 飞机维护手册 导航 NAVIGATION 2(4)
