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