S 862-039
 CAUTION:_______USE TOOLS THAT ARE NOT MAGNETIC. MAGNETIC TOOLS CAN CAUSE COMPASS DIFFERENCES.
 (12)
 Make sure that the N-S and E-W adjustment screws on the standby compass are at neutral.

 S 862-041

 (13)
 Make sure that one EHSI (or HSI) shows a magnetic heading that is less than one degree from the other EHSI (or HSI).

 S 752-042

 (14)
 Make sure all vehicles but the tow truck are more than 220 feet from the airplane.

 E. Standby Compass Swing (Single-cycle Error)
 S 582-044
 (1)  
Turn the airplane to a direction where the captain's EHSI (or HSI) shows a magnetic heading (MH)n that is not more than 2 degrees from magnetic north.

 S 972-126

 (2)  
Make a record of the EHSI (or HSI) magnetic heading (MH)n and the standby compass heading (CH)n.

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 (3)  S 972-046Calculate and make a record of the north heading deviation (Dn) as follows: Dn = (MH)n - (CH)n
 (4)  S 582-134Turn the airplane to less than 2 degrees from an east magnetic heading (MH)e as shown on the captain's EHSI (or HSI).
 (5)  S 972-128Make a record of the EHSI (or HSI) magnetic heading (MH)e and the standby compass heading (CH)e.
 (6)  S 972-049Calculate and make a record of the east heading deviation (De) as follows: De = (MH)e - (CH)e
 (7)  S 582-136Turn the airplane to less than 2 degrees from a south magnetic heading (MH)s as shown on the captain's EHSI (or HSI).
 (8)  S 972-051Make a record of the magnetic heading (MH)s and the compass heading (CH)s.
 (9)  S 972-052Calculate and make a record of the south heading deviation (Ds) as follows: Ds = (MH)s - (CH)s
 S 972-053

 (10) Calculate and make a record of the north-south single-cycle error
 coefficient (C) as follows: C = 0.5(Dn - Ds)
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737-300/400/500MAINTENANCE MANUAL
 S 822-054
 (11)
 Turn the N-S adjustment screw on the standby compass (while at the south magnetic heading) to give a compass heading indication of (CH)s - C.

 S 582-138

 (12)
 Turn the airplane to less than 2 degrees from a west magnetic heading (MH)w as shown on the captain's EHSI (or HSI).

 S 972-130

 (13)
 Make a record of the EHSI (or HSI) magnetic heading (MH)w and the standby compass heading (CH)w.

 S 972-057

 (14)
 Calculate and make a record of the west heading deviation (Dw) as

 follows:
 Dw = (MH)w - (CH)w

 S 972-059
 (15) Calculate and make a record of the east-west single-cycle error
 coefficient (B) as follows:
 B = 0.5(De - Dw)

 S 822-060
 (16) Turn the E-W adjustment screw on the standby compass (while at the west magnetic heading) to give a compass heading indication of (CH)w - B.
 F. Residual Error
 S 582-061
 (1)  
Turn the airplane near the center of the compass swing area with a magnetic heading of 0 degrees shown on the captain's EHSI (or HSI).

 S 972-132

 (2)  
Make a record of the EHSI (or HSI) magnetic heading (MH) and the standby compass heading (CH).

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H.
I.
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737-300/400/500MAINTENANCE MANUAL
 (3)  S 972-069Calculate and make a record of the deviation as follows: D = MH - CH
　
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