TM 55-1905-223-24-14
REPLACEMENT
a.
Position replacement switch unit (1) on bulkhead mounting holes and secure with four bolts (2) through unit
mounting holes.
b.
Remove enclosure cover (12) from replacement switch unit (1) by loosening two retaining screws (7) on
fasteners (6).
c.
Assemble stuffing tube caps to cables (3, 4, 5 and 10) and route cables into enclosure through holes in
bottom of switch unit.
d.
Assemble stuffing tube bodies to cables inside of enclosure, do not secure.
e.
Connect cables (3, 4, 5 and 10) wiring to terminal board TB1 (11) and remove tags.
f.
Connect cable C-LC1O lead to CR1 negative (-) terminal.
g.
Dress cables inside of enclosure and secure stuffing tube (8) assemblies.
h.
Position enclosure cover (12) on switch unit (1).
i.
Secure cover with fasteners (6) and retaining screws (7).
j.
On pilothouse IC/ELEX panel, set circuit breaker No. 1 (MK 27 GYRO PWR CONV UNIT) to ON. Remove
"Out of Service, Do Not Operate" tag.
k.
On pilothouse dc panel, set circuit breaker No. 1F (MK 27 GYRO PWR XFR UNIT) to ON. Remove "Out of
Service, Do Not Operate" tag.
l.
Start compass (TM 55-1905-223-10).
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