TM 55-1520-240-T
TABLE 15-1 APU COMPOSITE FAILURE SYMPTOM LIST (Continued)
ITEM
SYMPTOM
APPLICABLE
TASK
NO.
SYSTEM
3
APU STARTS BUT SHUTS DOWN
APU STARTS BUT SHUTS DOWN, ESU BITE
ELECTRONIC
15-6.14
INDICATES
THEN
APU STARTS BUT SHUTS DOWN, ESU BITE
ELECTRONIC
15-6.15
INDICATES
THEN
APU STARTS BUT SHUTS DOWN, ESU BITE
ELECTRONIC
15-6.16
INDICATES
THEN
APU STARTS BUT SHUTS DOWN, ESU BITE
ELECTRONIC
15-6.18
INDICATES
THEN
4
APU STARTS AND RUNS
APU STARTS AND RUNS THEN SHUTS DOWN,
ELECTRONIC
15-6.17
ESU BITE INDICATES
THEN
APU STARTS AND RUNS BUT ESU BITE
ELECTRONIC
15-6.19
INDICATES
5
APU SHUTS DOWN
APU SHUTS DOWN WHEN GEN APU SWITCH
ELECTRICAL
15-2.14
PLACED TO ON ESU BITE INDICATES
APu SHUTS DOWN WHEN APU GEN SWITCH
ELECTRICAL
15-2.15
IS SET TO OFF
6
APU CIRCUIT BREAKERS
APU CONT NORM OR APU CONT EMERG CIRCUIT
ELECTRICAL
15-2.7
BREAKER DOES NOT STAY CLOSED
7
ESU BITE INDICATORS
ESU BITE INDICATORS DO NOT CYCLE AFTER APU
ELECTRICAL
15-2.8
SWITCH SET TO RUN
TABLE 15-1 APU COMPOSITE FAILURE SYMPTOM LIST (Continued)
ITEM
SYMPTOM
APPLICABLE
TASK
NO.
SYSTEM
8
APU FUEL BOOST PUMP
APU FUEL BOOST PUMP CANNOT BE HEARD
ELECTRICAL
15-2.9
OPERATING BEFORE APU SWITCH SET TO START
9
CAPSULE GOES OUT
CAPSULE GOES OUT (APU SHUTS DOWN)
ELECTRICAL
15-211
WHEN APU CONT CIRCUIT BREAKER OPENED
CASULE OUT WHEN APU OPERATING
ELECTRICAL
15-2.13
NORMALLY
10
APU DOES NOT STOP
APU DOES NOT STOP, ESU INDICATORS ARE
ELECTRICAL
15-2.12
BLACK
11
APU PUMP FAULT LIGHT
APU PUMP FAULT LIGHT IS ON
HYDRAULIC
15-4.12
12
NO. 1 OR NO. 2 ENGINE DOES NOT MOTOR
NO 1 OR NO 2 ENGINE DOES NOT MOTOR
HYDRAULIC
15-5.6
(HYDRAULIC SYSTEM)
13
NO. 1 OR NO. 2 ENGINE KEEPS MOTORING
NO 1 OR NO 2 ENGINE KEEPS MOTORING WHEN
HYDRAULIC
15-5.7
ENGINE START SWITCH SET TO OFF
14
APU START ACCUMULATOR GAGE
APU START ACCUMULATOR GAGE DOES NOT INDICATE
HYDRAULIC
15-4.9
AT LEAST 2850 PSI
15-4
