TM 55-1520-240-T
FAILURE SYMPTOM LIST
ENGINE OIL PRESSURE INDICATING SYSTEM
SYMPTOM
TASK
ENGINE OIL PRESS CIRCUIT BREAKER DOES NOT STAY
CLOSED
8-3.3
ENGINE OIL PRESSURE INDICATOR DOES NOT INDICATE 0
8-3.3
SYMPTOM
TASK
ENGINE OIL TEMP CIRCUIT BREAKER DOES NOT STAY
CLOSED
8-4.3
SYMPTOM
TASK
NO. 1 ENGINE EMERGENCY POWER TIMER DOES NOT OP-
ERATE WHEN NO. 1 ENGINE PTIT INDICATION IS 890C TO
910C (WITHOUT 74)
8-5.3
NO. 1 ENGINE PTIT INDICATOR DOES NOT INDICATE IN
GREEN BAND (WITHOUT 74)
8-5.3
NO. 1 ENGINE PTIT INDICATOR DOES NOT INDICATE IN
GREEN BAND (WITH 74)
8-5.5.1
NO. 1 OR NO. 2 ENGINE EMERGENCY POWER FLAG INDI-
CATOR REMAINS BLACK WHEN NO. 1 OR NO. 2 ENGINE
PTIT INDICATION IS 890C TO 910C (WITHOUT 74)
8-5.3
SYMPTOM
TASK
NO. 1 OR NO. 2 ENGINE TORQUE DC CIRCUIT BREAKERS
WILL NOT STAY CLOSED (WITHOUT 74)
8-6.3
NO. 1 OR NO. 2 ENGINE TORQUE DC CIRCUIT BREAKERS
WILL NOT STAY CLOSED (WITH 74)
8-6.3.1
NO. 1 OR NO. 2 ENGINE TORQUE AC CIRCUIT BREAKER
8-6.3 or
WILL NOT STAY CLOSED
8-6.3.
1
NO. 1 POINTER ON PILOT'S OR COPILOT'S INDICATOR
DOES NOT INDICATE TORQUE (WITHOUT 74)
8-6.3
SYMPTOM
TASK
NO. 1 ENGINE OIL PRESS INDICATOR DOES NOT INDICATE
20 PSI MINIMUM OR POINTER FLUCTUATES MORE THAN 5
PSI
8-3.3
ENGINE OIL TEMPERATURE INDICATING SYSTEM
SYMPTOM
TASK
NO. 1 ENGINE OIL TEMPERATURE INDICATOR INDICATION
IS NOT WITHIN 10C OF FAT INDICATOR
8-4.3
PTIT AND EMERGENCY POWER INDICATING SYSTEM
SYMPTOM
TASK
NO. 1 OR NO. 2 ENGINE EMERGENCY POWER FLAG INDI-
CATOR WILL NOT RESET TO BLACK, FLAG RESET SWITCH
AT RESET (WITHOUT 74)
8-5.3
NO. 1 OR NO. 2 ENGINE EMERGENCY POWER LIGHTS WILL
NOT COME ON WHEN PRESSED TO TEST (WITHOUT 74)
8-5.3
NO. 2 ENGINE EMERGENCY POWER TIMER DOES NOT OP-
ERATE WHEN NO. 2 ENGINE PTIT INDICATION IS 890C TO
910C (WITHOUT 74)
8-5.3
NO. 2 ENGINE PTIT INDICATOR DOES NOT INDICATE IN
GREEN BAND (WITHOUT 74)
8-5.3
TORQUE INDICATING SYSTEM
SYMPTOM
TASK
NO. 1 POINTER ON PILOT'S OR COPILOT'S INDICATOR
DOES NOT INDICATE TORQUE (WITH 74 )
8-6.3.1
NO. 1 POINTER ON PILOTS OR COPILOTS INDICATOR DOES
NOT INDICATE PROPER TORQUE USING TORQUE SIGNAL
SIMULATOR (WITHOUT 74)
8-6.3
NO. 1 POINTER ON PILOTS AND COPILOTS INDICATOR OP-
8-6.3 or
ERATES ERRATICALLY
8-6.3.1
NO. 2 POINTER ON PILOT'S OR COPILOT'S INDICATOR
DOES NOT INDICATE TORQUE (WITHOUT 74)
8-6.3
SYMPTOM
TASK
NO. 2 ENGINE OIL PRESS INDICATOR DOES NOT INDICATE
20 PSI MINIMUM OR POINTER FLUCTUATES MORE THAN 5
PSI
8-3.3
SYMPTOM
TASK
NO. 2 ENGINE OIL TEMPERATURE INDICATOR INDICATION
IS NOT WITHIN 10C OF FAT INDICATOR
8-4.3
SYMPTOM
TASK
NO. 2 ENGINE PTIT INDICATOR DOES NOT INDICATE IN
GREEN BAND (WITH 74)
8-5.6.1
PILOT'S AND COPILOT'S EMERGENCY POWER LIGHTS DO
NOT COME ON WHEN NO. 1 OR NO. 2 ENGINE PTIT INDICA-
TION IS 890C TO 910C (WITHOUT 74)
8-5.3
PILOT'S AND COPILOT'S EMERGENCY POWER LIGHTS ON,
ROTOR AT 100 PERCENT ROTOR RPM, BOTH ENGINES OP-
ERATING (WITHOUT 74 )
8-5.3
SYMPTOM
TASK
NO. 2 POINTER ON PILOT'S OR COPILOT'S INDICATOR
DOES NOT INDICATE TORQUE (WITH 74)
8-6.3.1
NO. 2 POINTER ON PILOTS OR COPILOTS INDICATOR DOES
NOT INDICATE PROPER TORQUE USING TORQUE SIGNAL
SIMULATOR (WITHOUT 74)
8-6.3
NO. 2 POINTER ON PILOTS OR COPILOTS INDICATOR OP-
8-6.3 or
ERATES ERRATICALLY
8-6.3.1
8-2.2 Change 19
