COMPASS SYSTEM - ADJUSTMENT/TEST
EFFECTIVITY
CP CF-CPB thru CF-CPZ GJ ALL EXCEPT B-2509 AND B-2510
1. Compass Systems Test
A. General
(1)
The following tests should be carried out prior to compass compensation procedure which is detailed in Compass System - Maintenance Practices.
(2)
The tests are designed to check out the serviceability of the system and not its accuracy.
B. Prepare System for Test
(1)
Connect external power and close ground power switch on panel P5.
(2)
Close following circuit breakers: COMPASS NO. 1, COMPASS NO. 2, INSTR XFMR NO. 1, INSTR XFMR NO. 2, CAPT RMI (ALT), F/O RMI (ALT), INSTR TRANS and INVERTER CONTROL.
(3)
Place compass transfer switch in NORM position.
(4)
Allow 10 minutes for systems to stabilize. Synchronize system No. 1 by pushing in and rotating captain's RMI SYNC knob in direction indicated by annunciator; synchronize system No. 2 in a similar manner using first officer's RMI SYNC knob.
C. Test Compass Systems
(1) Fast Synchronization Tests
(a)
Rotate captain's RMI SYNC knob as fast as possible. Warning flags should appear on captain's RMI and first officer's CDI.
(b)
Rotate first officer's RMI SYNC knob as fast as possible. Warning flags should appear on first officer's RMI and captain's CDI.
(c)
Resynchronize both systems.
(d)
Rotate captain's RMI SYNC knob in direction of dot; compass card should rotate clockwise and annunciator should rotate toward plus sign. Rotate knob through synchronization in direction of plus sign; compass card should rotate counterclockwise and annunciator should rotate toward dot.
(e)
Repeat step (d) using first officer's RMI SYNC knob.
Apr 01/97 34-21-0 Page 501
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
(2)
Slaving Tests
(a)
Use captain's RMI SYNC knob to set heading 3 to 4 degrees away from its synchronized reading. Check that reading returns to synchronized reading and annunciator nulls in less than 5 minutes.
(b)
Repeat step (a) using first officers RMI.
(3)
Repeater Operation
(a)
Using captain's RMI SYNC knob, rotate compass card through 360 degrees in 15-degree increments. Check that first officer's HSI compass card follows smoothly and repeats each setting within ± 1 degree.
(b)
Using first officer's RMI SYNC knob, rotate compass card through 360 degrees in 15-degree increments. Check that captain's HSI compass card follows smoothly and repeats each setting within ± 1 degree.
(c)
Place compass transfer switch in BOTH ON NO. 1 position.
(d)
Using captain's RMI SYNC knob, rotate compass card through 360 degrees in 15-degree increments. Check that first officer's RMI and HSI compass cards follow smoothly and repeat each setting within ± 1 degree. Check that captain's HSI follows smoothly and repeats each setting within ± 2 degrees.
(e)
Place compass transfer switch in BOTH ON NO. 2 position.
(f)
Using first officer's RMI SYNC knob, rotate compass card through 360 degrees in 15-degree increments. Check that captain's RMI and HSI follow smoothly and repeat each setting within ± 1 degree. Check that first officer's HSI follows smoothly and repeats each setting within ± 2 degrees.
(4)
Compass Warning Tests
(a)
Check system malfunction warning test using following table. Open circuit breakers listed one at a time and close at completion of each section. Check that flags appearing upon opening of a circuit breaker disappear when that circuit breaker is closed.
(b)
Place compass transfer switch in normal position.
541
34-21-0 Page 502 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. May 01/75
STEP COMPASS TRANSFER SWITCH POSITION OPEN CIRCUIT BREAKER FLAG APPEARS ON
1 NORMAL COMPASS-1 CAPT RMI & F/O HSI
2 NORMAL COMPASS-2 F/O RMI & CAPT HSI
3 NORMAL INSTR XFMR-1 F/O HSI
4 NORMAL INSTR XFMR-2 CAPT HSI
5 BOTH ON NO. 1 COMPASS-1 CAPT RMI & HSI; F/O RMI & HSI
6 BOTH ON NO. 1 CAPT RMI (ALT) F/O RMI & CAPT HSI
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