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A
737-300/400/500MAINTENANCE MANUAL
 (k)  
Turn the top and bottom SCC dials to show an indication of E at the index line.

 (l)  
Make a record of the heading shown on the master magnetic compass.

 (m)  
Turn the top and bottom SCC dials to show an indication of W at the index line.

 (n)  
Make a record of the heading shown on the master magnetic compass.

 (o)  
Turn the magnetic field cancellation adjustment screw on the SCC to decrease the heading errors in each direction (E and W) to a minimum.

 (p)  
Continue to adjust the SCC dials for each direction (E and W). Then use the field cancellation adjustment screw until the errors are at a minimum.

 NOTE: Continue to do this procedure until the error in each
____
 direction is at a minimum.

 Do not move the field cancellation adjustment screw
 before the compass swing is completed.
 E. Prepare for a Compass Swing of the Standby Compass
 S 582-085
 (1)  Tow the airplane to the compass swing area (AMM 9-10-00/201).
 NOTE: The compass swing area must be a level area with a smooth
____ surface. It must be sufficiently strong to hold the weight of the airplane. The area must be large enough to tow or taxi the airplane. Make sure all vehicles other than the tow vehicle are not less than 220 feet from the airplane.
 The horizontal component of the earth's magnetic field must be constant (|1 degree) in the test area. Measure the horizontal component if magnetic material (such as a new building) is less than 600 feet from the compass rose. Do not use the compass rose if the horizontal component is not constant (|1 degree).
 S 862-086
 (2)  
Supply the electrical power (AMM 24-22-00/201).

 S 862-087

 (3)  
Energize all of the electronic equipment, radios, and control cabin lighting for the usual conditions that occur in flight.

 S 862-120

 (4)  
AIRPLANES WITH EFIS; On the P7 panel, set the captain's and first officer's EFIS mode switches to the VOR/ILS position (AMM 34-22-00/501).

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A 737-300/400/500MAINTENANCE MANUAL

MAGNETIC FIELD CANCELLATION ADJUSTMENT SCREW
Standby Compass Calibrator
Figure 202

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H50300
A 
737-300/400/500MAINTENANCE MANUAL
 S 862-142
 (5) AIRPLANES WITHOUT EFIS;
 Set the HSI transfer switches to VOR/ILS (AMM 34-31-00/501).
 ú
 ú  S 862-088
 ú  (6) Align the IRS to the NAV mode (AMM 34-28-00/201).
 ú
 ú  S 862-145
 ú  (7) Align the IRS to the NAV mode (AMM 34-28-01/201).
 S 862-111
 CAUTION: USE TOOLS THAT ARE NOT MAGNETIC. MAGNETIC TOOLS CAN CAUSE_______
 COMPASS DIFFERENCES.
 (8) Make sure that the N-S and E-W adjustment screws on the standby
 compass are at neutral.
 S 862-140
 (9) Make sure that one EHSI (or HSI) shows a magnetic heading that is
 less than one degree from the other EHSI (or HSI).
 S 752-090
 (10) Make sure all vehicles but the tow truck are not less than 220 feet
 from the airplane.
 F.  Standby Compass Adjustment
 NOTE: The steps that follow are for the four-point calibration swing:____
 S 582-122
 (1) Turn the airplane to a direction where the captain's EHSI (or HSI)
 shows a magnetic heading of 0 degree.
 S 032-091
 (2) Remove and keep the lower left and upper right mounting screws on
　
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