D. If no longer required, remove electrical power from the airplane.
Nov 01/75 34-21-0 Page 503
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
REMOTE COMPASS TRANSMITTER - REMOVAL/INSTALLATION
1. General
A. The remote compass transmitter (flux valve) is extremely sensitive to magnetic fields. It should never be exposed to strong fields in its vicinity. Perform demagnetication of area near flux valves shown in Fig. 401 when necessary (Ref 34-24-0, Maintenance Practices).
B. Care should be exercised in handling and transporting the flux valve since the sensing element is mounted to allow 30 degrees of movement in the pitch and roll axes.
C. The flux valve is preindexed by the vendor to the plate upon which it is mounted, thus permitting flux valve replacement without system recalibration. The vendor adjusted screws should not be removed or loosened for flux valve replacement purposes.
2. Equipment and Materials
A. Maintenance stand of sufficient height to reach the flux valve access panels in the tail fin.
3. Remove Flux Valve
CAUTION: USE NONMAGNETIC TOOLS AND FASTENERS WHEN WORKING WITHIN 3 FEET OF FLUX VALVE OR COMPASS SYSTEM CALIBRATION MAY BE DISTURBED.
DO NOT MEASURE FLUX VALVE CONTINUITY WITH AN OHMMETER. CURRENT FLOW THROUGH SENSING COILS MIGHT DAMAGE UNIT.
A. Remove electrical power from the compass system by opening the applicable circuit breakers on the P6 and P18 circuit breaker panels.
B. Remove access panel to gain access to flux valve and mounting. Bag screws and attach to access panel (Ref Chapter 12, Access Doors and Panels).
C. Remove flux valve connector.
D. Remove four mounting screws holding mounting plate to bracket in airplane (Fig. 401).
CAUTION: DO NOT DISTURB THE VENDOR ADJUSTED SCREWS OR REINDEXING (A BENCH ADJUSTMENT) WILL BE REQUIRED.
E. Bag screws separately from panel screws and attach to access panel.
F. Remove flux valve (with mounting plate).
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Remote Compass Transmitter Installation 502
34-21-11 Figure 401 Aug 15/79
Page 402
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
4. Install Flux Valve
CAUTION: USE NONMAGNETIC TOOLS AND FASTENERS WHEN WORKING WITHIN 3 FEET OF FLUX VALVE OR COMPASS SYSTEM CALIBRATION MAY BE DISTURBED.
DO NOT MEASURE FLUX VALVE CONTINUITY WITH AN OHMMETER. CURRENT FLOW THROUGH SENSING COILS MIGHT DAMAGE UNIT.
A. Remove electrical power from the compass system by opening the applicable circuit breakers on the P6 and P18 circuit breaker panels.
B. Place flux valve, complete with mounting plate, on airplane bracket as shown in Fig. 401.
C. Line up four mounting holes and insert mounting screws.
D. Hand tighten all four screws.
E. Tighten down the two screws which secure the mounting plate to the butt line referenced surface on the airplane bracket.
F. Tighten down the remaining two screws.
G. Connect electrical connector and tighten.
H. Replace access panels (all screws and hardware within 36 inches of flux valve must be of nonmagnetic material).
I. Apply electrical power to the system by closing the applicable circuit breakers on the P6 and P18 circuit breaker panels.
J. Perform operational check of compass system (Ref 34-21-0, Adjustment/Test).
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DIRECTIONAL GYRO - REMOVAL/INSTALLATION
1. General
A. A gyro should not be removed from its seating position until its rotor has come to rest. At least 3 minutes should be allowed after switch off, in order to meet this requirement.
B. Particular care should be exercised in transporting a gyro from place to place. It is a delicate instrument, which will not withstand knocks or rough handling. Use approved containers for transportation whenever possible.
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