H24326
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 - Unpublished Work - See title page for details.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).
502
Aug 15/79 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 34-21-11 Page 403
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.
C. Where necessary, laminated shim stock is used to seat each gyro within required tolerances relative to the airplane's axes. Extreme care should be exercised when removing the gyros to ensure that-the shims are not dislodged; and, if they are, to return them to their original positions when replacing the gyro. (If installed, the shims are bonded to the mounting surface in the airplane.)
2. Remove Directional Gyro
A. Remove power from compass systems. Open all related circuit breakers.
B. Disconnect electrical connectors from gyro to be removed (Fig. 4ol).
C. Remove four screws attaching gyro to mounting plate.
D. Bag screws and attach to gyro or mounting.
E. Remove gyro.
3. Install Directional Gyro
A. Place directional gyro on mounting plate as shown in Fig. 401.
B. Align gyro to holes in mounting surfaces and install four mounting screws. Tighten screws.
C. Connect electrical connectors and tighten.
502
Aug 15/77 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 34-21-21 Page 401
H24332
Directional Gyro Installation 502
34-21-21 Figure 401 May 15/67
Page 402
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
D. Connect external electrical power or use APU power.
E. Check that all compass system and instrument transformer circuit breakers are closed.
F. Place compass transfer switch to NORMAL (if installed).
G. Allow 10 minutes for the system to stabilize and check that the RMI and CDI (HSI) compass warning flags are out of view.
H. 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.
I. Repeat step H using first officer's RMI SYNC knob.
J. Disconnect electrical power.
502
Nov 1/74 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 34-21-21 Page 403
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