TM 55-1905-223-24-14
(8) On binnacle (FIGURE 2-22), set lighting toggle switch (5) to ON.
(9) Verify binnacle lamp lights.
b. Compass fluid replacement.
(1) On binnacle (FIGURE 2-22) set lighting toggle switch (5) to OFF.
(2) On pilothouse dc panel, set circuit breaker No. 1F (Magnetic Compass LT) to OFF. Tag "Out of Service, Do
Not Operate".
(3) On binnacle (FIGURE 2-23), release two clamps (1) and remove hood (2).
(4) Tip magnetic compass (3) upright in gimbal ring (4) so that filler plug screw (5) is at top.
(5) Back filler plug screw (5) out SLOWLY. If fluid should start to leak out, secure filler plug screw (5) to prevent
any further fluid loss.
(6) Reposition magnetic compass (3) until bubble is directly beneath filler plug screw (5).
(7) Back out filler plug screw (5) SLOWLY and remove.
(8) Fill magnetic compass (3) with compass oil if compass was manufactured after 1970 (see data plate); use
distilled water if compass was manufactured before 1970.
(9) Secure filler plug screw (5) into magnetic compass (3) bowl.
(10) Replace hood (2) on binnacle and secure with two clamps (1).
(11) On pilothouse dc panel, set circuit breaker No. 1F (Magnetic Compass LT) to ON. Remove "Out of
Service, Do Not Operate" tag.
(12) On binnacle (FIGURE 2-22) set lighting toggle switch (5) to ON.
(13) Verify that hood lamp lights.
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