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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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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