TM 55-1520-240-T
9-1.4
DC POWER SYSTEM OPERATIONAL CHECK (Continued)
9-1.4
TASK
RESULT
11.
Open NO. 1 REV CUR CO circuit breaker (6).
NO. 1 RECT OFF (Without 74) RECT 1 (With 74) capsule
(16) shall come on. If it does not, replace NO. 1 reverse
current cutout relay.
12.
Turn top and bottom anti collision lights ON. Refer to
Both top and bottom anti collision lights shall flash. If they
task 9-6.3.
do not, go to task 9-1.12.
13.
Turn overhead panel lights ON.
Overhead panel lights shall come on. If they do not, go to
task 9-1.13.
14.
Close NO. 1 REV CUR CO circuit breaker (6). Open
NO. 1 RECT OFF (Without 74) RECT 1 (With 74) capsule
(16) shall go out. NO. 2 RECT OFF (Without 74) RECT 2
(With 74) capsule (17) shall come on. If it does not, replace
NO. 2 reverse current cutout relay.
15.
Check overhead panel lights.
Overhead panel lights shall still be on. If they are out, go to
task 9-1.14.
16.
Check anti collision lights.
Anti collision lights shall still be on. If they are not, go to task
9-1.15.
17.
Turn off overhead panel lights.
18.
Close NO. 2 REV CUR CO circuit breaker (13).
NO. 2 RECT OFF (Without 74) RECT 2 (With 74) capsule
(17) shall go out.
19.
Open NO. 1 REV CUR CO and NO. 2 REV CUR CO
NO. 1 and NO. 2 RECT OFF (Without 74) RECT 1 and
circuit breakers (6 and 13).
RECT 2 (With 74) capsules (16 and 17) shall come on.
20.
Turn cabin and ramp white lights ON.
Cabin and ramp white lights shall come on. If they do not,
go to task 9-1.16.
21.
Close NO. 1 REV CUR CO and NO. 2 REV CUR CO
NO. 1 and NO. 2 RECT OFF (Without 74) RECT 1 and
circuit breakers (6 and 13).
RECT 2 (With 74) capsule (16 and 17) shall go out.
22.
Disconnect electrical connector (27) from battery (28).
23.
Check cabin and ramp white lights.
Cabin and ramp white lights shall stay on. If they are not on,
go to task 9-1.20.
23.1 Connect electrical connector (27) to battery (28).
24.
Turn off cabin and ramp white lights. Use CAB &
RAMP LT switch. Refer to task 9-15.3.
NOTE
Steps 25 through 27 can only be performed
with an external 28VDC power source.
TASK
RESULT
25.
Connect external 28VDC power source to receptacle
NO. 1 and NO. 2 RECT OFF (Without 74) RECT 1 and
(25). Turn on power supply.
RECT 2 (With 74) capsules (16 and 17) shall come on. EXT
PWR capsule (26) shall come on. If capsule (16 or 17) is
out, go to task 9-1.17. If capsule (26) does not come on, go
to task 9-1.18. EXT PWR CONT circuit breaker (5) shall
stay closed. If it does not, go to task 9-1.21.
26.
Check anti collision lights.
Anticollision lights shall still be on. If they are not, go to task
9-1.19.
27.
Turn off and disconnect external 28VDC power.
NO. 1 and NO. 2 RECT OFF (Without 74) RECT 1 and
RECT 2 (With 74) capsules (16 and 17) shall go out. EXT
PWR
capsule
(26)
shall
go
out.
If
any
capsule
(16, 17, or 26) is still on, replace external power control
relay.
28.
Turn off anti collision lights.
29.
Shutdown apu. Refer to task 15-1.4.
FOLLOW-ON MAINTENANCE:
None
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9-12 Change 19
