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 TM 55-1905-219-14-11
5-116. REMOTE MAGNETIC HEADING COMPASS (RMHS) - MAINTENANCE INSTRUCTIONS (Continued).
LOCATION
ITEM
ACTION
REMARKS
ADJUST-CALIBRATION (Cont)
(c)
Algebraically add sums from steps (a) and (b) and divide total by 4. Record the quotient as index error.
(d)
Align the vehicle to magnetic 000-degree heading and record indication of Heading Indicator.
(e) Remove all magnetic material from person adjusting the compass transmitter case. Loosen three nuts securing
Induction Compass Transmitter case for the support. Rotate Induction Compass Transmitter so that new heading on
Heading Indicator is equal to heading recorded in step (d), minus the index error (magnitude and sign, calculated in step
(c).
2. Cyclic Error.
NOTE
If calibration cannot be accomplished by the following adjustments,
substitute known good components, Induction Compass Transmitter or
Heading Indicator to obtain a calibratable RMHS.
(a)
Secure transmitter case with three mounting nuts, insuring that position does not shift.
(b) Remove 4 screws, securing the Heading Indicator. Pull the indicator out and position so that both the rear and
front of indicator case are accessible and visible.
5-1299
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