TM 55-1905-223-24-14
This task covers: a. Removal, b. Replacement
INITIAL SETUP
Tools
Equipment Condition
Tool kit, general mechanic's,
TM 55-1905-223-10, compass
secured.
Tool kit, electrician's,
Materials/Parts
Switch unit, P/N 1884498
Warning tags, Item 8, Appendix C
REMOVAL
a.
On pilothouse IC/ELEX panel, set circuit breaker No. 1 (MK 27 CYRO PWR CONV UNIT) to OFF. Tag "Out
of Service, Do Not Operate."
b.
On pilothouse dc panel, set circuit breaker No. 1F (MK 27 GYRO PWR XFR UNIT) to OFF. Tag "Out of
Service, Do Not Operate."
c.
On switch unit (1), loosen two fasteners (6) by loosening retaining screws (7).
d.
Remove enclosure cover (12) and let cover suspend on retaining chain (9).
e.
Tag and disconnect four cables (3, 4, 5 and 10) wiring from terminal board TB1 (11).
f.
Disconnect wire from cable (4) C-LC1O to CR1 from CR1 negative (-) terminal.
g.
Disassemble stuffing tubes (8) and pull cables (3, 4, 5 and 10) from switch unit (1). Remove stuffing tubes
and retain.
h.
Remove switch unit (1) from bulkhead by removing four mounting bolts (2) from mounting holes.
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