TM 1-1520-238-T-6
Change 5
9–507
9–233. CIRCUIT PROTECTION SYSTEM (DC ESSENTIAL BUS 3 – PILOT STATION) –
9–233
MAINTENANCE OPERATIONAL CHECK (cont)
Task
Result
q. Check for 28 VDC at P1-51.
If 28 VDC is not present, go to paragraph 9–238.
r. Check for 28 VDC at P1-17.
If 28 VDC is not present, go to paragraph 9–240.
s. Check for 28 VDC at P1-27.
If 28 VDC is not present, go to paragraph 9–241.
t. Check for 28 VDC at P1-34.
If 28 VDC is not present, go to paragraph 9–242.
u. Check for 28 VDC at P1-47.
If 28 VDC is not present, go to paragraph 9–243.
v. Check for 28 VDC at P1-14.
If 28 VDC is not present, go to paragraph 9–244.
w. Check for 28 VDC at P1-53.
If 28 VDC is not present, go to paragraph 9–245.
x. Check for 28 VDC at P1-29.
If 28 VDC is not present, go to paragraph 9–247.
y. On helicopters with BUCS activated (ACA),
check for 28 VDC at P1-33.
If 28 VDC is not present, go to paragraph 9–248.
z. Attach P1.
2. On pilot ELEC PWR panel, set BATT/EXT PWR switch to OFF.
3. Perform EXTERNAL POWER – POWER DOWN (para 9–46).
