TM 55-1905-223-24-14
2-26.
Replace Power Transfer Unit. (FIGURE 2-20)
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
Power transfer unit P/N 1887874
Warning Tags, Item 8, Appendix C
REMOVAL
a. On pilothouse IC/ELEX panel, set circuit breaker No. 1 (MK 27 GYRO PWR CONV UNIT) to OFF. Tag "Out of
Service, Do Not Operate."
b. On pilothouse dc panel, set circuit breaker No. 1F (GYRO PWR TRANSF UNIT) to OFF. Tag "Out of Service -
Do Not Operate."
c.
On power transfer unit (1), open cover (2) by loosening four captive thumbscrews (3).
d. Tag and disconnect cables (6), (7), and (8) from terminal board (4) TB1.
e. Disassemble stuffing tubes (5) and pull cables (6, 7, and 8) out of electrical equipment cabinet.
f.
Support power transfer unit (1) and remove four bolts (9) from mounting holes and remove power transfer unit (1)
from bulkhead.
REPLACEMENT
a. Position replacement power transfer unit (1), on bulkhead aligning mounting holes on unit with mounting holes on
bulkhead, secure with four bolts (9).
b. Open cover (2) by loosening four captive thumbscrews (3).
2-71
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