TB 55-6605-262-24
Section III. GS MAINTENANCE INSTRUCTIONS
6. Maintenance Instructions for Magnetic Compass . Maintenance of magnetic compass is limited to
changing burned out lamps, cleaning of glass, replacement of defective lighting cables, and removal of air
bubbles.
NOTE
Do not interchange fluids, use only the type fluid specified for specific
compass.
7. Maintenance Instructions for RMHS.
a. Check for water or moisture in Flux Valve housing; replace gasket/screws as required.
b. Check for 5 Amp fuses for RMHS.
c. Check for water in terminal boxes, repack stuffing tubes if required.
d. Be sure no continuity exists between terminal on terminal blocks- (could be caused by saturation of
terminal block by water standing in box).
e. Check cables for defects, cuts, frayed braiding, shorts, etc.
f. Check vessel's power with all systems energized and engine running, 26 + 3 VDC required for
RMHS operation.
g. Check packing in stuffing to prevent water leakage into terminal boxes.
h. Energize RMHS when operating vessel to prevent moisture from entering system.
i. Replace 3 aluminum 1/2 inch nuts at bottom of transmitter case with brass/310 stainless nuts.
8. Maintenance Instructions For MK 27, Mod 1 and Mod 0 Gyrocompasses by General Support
Maintenance. Perform the following maintenance on an annual basis. Clean and inspect electronic control
cabinet and/ or power converter.
9. Maintenance Instructions for MK 27, Mod 1 and Mod 0 Gyrocompasses By General Support
Maintenance. Perform the following maintenance on an annual basis.
Clean and inspect electronic control cabinet and/or power converter.
(1) Safety Precautions.
(a) Observe standard safety precautions.
(b) De-energize power supply and tag "Out of Service".
(2) Tools Required.
(a) Flashlight.
(b) Safety Tag.
(c) Shorting probe.
(d) Voltage tester.
(e) Dusting brush.
(f) Vacuum cleaner (with non-metallic nozzle).
(g) Lint-free rags.
(h) Camel's hair brush.
(i) No. 2 Phillips screwdriver.
(j) 6 inch normal duty screwdriver.
(3) Maintenance Procedures.
(a) Release fasteners, remove chassis from housing.
(b) Check with voltage tester to ensure electrical circuits are de-energized.
(c) Vacuum interior of housing with nonmetallic nozzle, insuring that dirt and dust is removed
from elements. Use dusting brush to reach hard to get areas.
(d) Clean components and surface areas with lint-free rags.
(e) Inspect electrical and mechanical connections for tightness.
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