TM 1-1520-238-23
Change 2
1-252.1
1.75.
APU OPERATING INSTRUCTIONS USING EXTERNAL POWER continued
CAUTION
Ensure FIRE BTL select switch is cen-
tered between PRI/RES or fire bottle may
discharge.
x. Check APU fire detection system.
(1) Set FIRE TEST DET switch (11) on APU fire
test panel (12) to 1.
(2) Verify FIRE APU light (13) on pilot master
caution panel (14) lights.
(3) Verify APU FIRE PULL handle light (15) on
APU fire test panel (12) is lighted.
(4) Set FIRE TEST DET switch (11) on APU fire
test panel (12) to 2.
(5) Verify FIRE APU light (13) and APU FIRE
PULL light (15) are lighted.
(6) Set FIRE TEST DET switch (11) on APU fire
test panel (12) to OFF.
GO TO NEXT PAGE
M04-1868-18
PILOT STATION
PRI
RES
M04-1868-10A
11
15
12
14
13