TM 1-1520-238-23
Change 2
1-246.5
1.74.
APU OPERATING INSTRUCTIONS – USING BATTERY POWER – continued
z. Start APU.
(1) On APU fire test panel (15), hold RUN switch
(19) to RUN for 1 or 2 seconds, then to
START for 1 or 2 seconds.
(2) Release switch (19).
NOTE
APU is hydraulically started. If it does
not start, hydraulic accumulator pres-
sure may be too low.
When the APU turbine rotor reaches
95% or greater of normal revolution
per minute (rpm), the APU ON indica-
tor on the pilot caution/warning panel
lights.
APU FAIL indicator on the caution/
warning panel remains lit until APU oil
pressure reaches normal operating
pressure.
aa. Verify APU ON indicator light (20) is lighted on
pilot caution/warning panel (12).
ab. Turn on two generators.
(1) Set GEN 1 switch (21) to TEST.
(2) Verify GEN 1 light (22) on pilot caution/warn-
ing panel (18) is not lighted.
(3) Set GEN 2 switch (23) to TEST.
(4) Verify GEN 2 light (24) on pilot caution/warn-
ing light panel (12) is not lighted.
(5) Set switches (21) and (23) to GEN 1 and GEN
2.
(6) Verify GEN 1 light (22) and GEN 2 light (24)
are not lighted.
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PRI
RES
19
15
M04-1601-11A
M04-1601-12A
12
24
22
21
23
20
