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The internal lighting of the magnetic compass is supplied by "BUS 1" bar via "COMPASS LIGHTING" fuse. The fuse is located in the fuse panel secured on the firewall (Frame CO).
4. OPERATION NOTE : For equipment operation and maintenance, refer to the supplier's Maintenance Manual.
MAGNETIC COMPASS MAINTENANCE PRACTICES 1. CALIBRATION OF COMPASSES (Figure 201)
NOTE : This method of compensation and calibration of aircraft magnetic compasses specifies maximum deviations permissible for each type of magnetic compass on all aircraft models.
A. Definitions
1) "CALIBRATION" means the measurement of residual deviations of a compass installed in an aircraft, once compensation has been carried out.
2) "COMPENSATION" means the correction of deviations resulting from magnetism in an aircraft.
3) "DEVIATION" means the angle required to be added algebraically to a compass reading to obtain the aircraft magnetic heading.
4) "DIRECT READING COMPASS" means a compass which has the magnetic sensing element and heading indication located in the same instrument.
5) "REMOTE INDICATING COMPASS (non-stabilised)" means a remote indicating compass (flux valve) without gyroscopic means of stabilization.
6) "REMOTE INDICATING COMPASS (stabilised)" means a compass system which has the magnetic sensing element located remotely from the indicator(s) together with gyroscopic means to stabilize or smooth the heading indications.
7) "STANDBY COMPASS" means a direct reading compass which is not used as the primary heading reference.
B. Calibration (Figure 201)
1) Compass calibration shall be conducted using approved compass calibration equipment or by aligning the axis of the aircraft with each cardinal and 30 degrees magnetic heading.
2) The deviation shall be determined at each magnetic heading with all equipment positioned and operating so that the magnetic effects of the aircraft as sensed by the compass(es) are as close as possible to those of straight and level flight.
3) The deviation at any heading shall not exceed :
a) 2 degrees for a remote indicating compass (stabilised).
b) 5 degrees for a remote indicating compass (non-stabilised).
c) 5 degrees for a direct reading compass used as the primary compass.
d) 10 degrees for a standby compass.
NOTE : An appropriate procedure for compass calibration is described in Paragraphs 7 and 8.
4) Any combination of aircraft systems, that are positioned, operated or loaded within their operating limits shall not vary the compass deviations as specified in paragraph B in excess of :
a) 2 degrees for a remote indicating compass (stabilised).
b) 4 degrees for a remote indicating compass (non-stabilised).
c) 5 degrees for a direct reading compass used as the primary compass.
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本文链接地址：TB20 MAINTENANCE MANUAL 34 导航 TB20飞机维护手册 1(43)
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