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 A.  The standby compass is a highly sensitive instrument of liquid-filled design. The card assembly, which indicates magnetic direction, is illuminated by a bulb located at the top of the compass.
 B.  The standby compass for its operation depends upon the effect of the earth's magnetic field. The card assembly is so suspended that the magnets which are attached to the card assembly are free to align themselves with the horizontal component of the earth's magnetic field. The magnetic heading of the airplane is read from the card assembly against the lubber line.
 C.  At the bottom of the standby compass under a cover plate are two compensators decaled N-S and E-W. The purpose of the compensators is to compensate for magnetic disturbances in the area of standby compass.
 D.  The correction card holder mounted below the standby compass holds the correction card. The compass card lists the heading for the pilot to steer to maintain a desired heading.
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 ALL  ú ú 03 Page 1 ú Mar 15/91
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL

Standby Compass Location Diagram
Figure 1

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 34-24-00

 ALL  ú ú 03 Page 2 ú Jul 15/89
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
 MAGNETIC STANDBY COMPASS - MAINTENANCE PRACTICES
________________________________________________
 1.  General_______
 A.  This procedure has three tasks. The first two tasks are different procedures that are used to do a swing of the standby magnetic 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: The calibrator procedure cannot be used on airplanes with a
____
 stowable standby compass.

 Air bubbles can occur in the standby magnetic compass because of temperature and/or decrease of liquid . Maintenance limits made for liquid quantity make sure of satisfactory compass operation. When air bubble is larger than 3/8-inch wide and 1/8-inch high , with the glass approximately vertical position, replace the standby compass.
 (1)  
It is not necessary to keep a constant radius or tangency during airplane tow around the compass rose or the swing area. Tow direction is optional. These make no difference when you calculate the solutions.

 (2)  
Park no vehicles less than 220 feet from the airplane during the compass swing.

 (3)  
Make sure the radio receivers are on during the compass swing.

 (4)  
You can use the APU during the compass swing.

 B.  The other task is to remove the magnetic field from the strut assembly of the nose landing gear. If lightning hits the nose landing gear, it can cause a strong magnetic field in the strut assembly. This can cause a large error in the standby compass indication.
 (1)  
It is usually possible to find a magnetic field with a small compass held in the hand.

 (2)  
Use a degausser to remove a magnetic field from the strut assembly of the nose landing gear.

 TASK 34-24-00-822-031
 2.  Magnetic Standby Compass Tow-Around Procedure_____________________________________________
 A.  Standard Tools and Equipment
 (1)  
Standard tow tractor or towbarless vehicle

 (2)  
Non-magnetic tools to adjust the standby magnetic compass

 (3)  
One compass correction card (Fig. 201)

 B.  References
 (1)  
AMM 9-10-00/201, Towing

 (2)  
AMM 24-22-00/201, Manual Control (Apply Power)

 (3)  
AMM 32-09-01/401, Main Landing Gear Safety Sensors

 (4)  
AMM 34-22-00/501, Electronic Flight Instrument System

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