TM 55-1520-240-T
1-1
FAILURE SYMPTOM LIST
1-1
The following list contains the titles of all Failure Symptoms in this manual. The titles are alphabetically arranged beneath the system and chapter where they are found.
SYMPTOM
TASK
CHAPTER 2
VIBRATION ANALYSIS
HIGH FREQUENCY VIBRATION ISOLATION PROCEDURE
2-1.1
LOW FREQUENCY VIBRATION ISOLATION PROCEDURE
2-1.1
ROTOR BLADE SHOCK ABSORBER ISOLATION PROCEDURE
2-1.1
VIBRATION FREQUENCY IDENTIFIED AS 225 RPM (1/REV)
2-1.1
VIBRATION FREQUENCY IDENTIFIED AS 675 CYCLES/MIN
(3/REV)
2-1.1
VIBRATION FREQUENCY TOO RAPID TO COUNT, VIBRATION
FELT IN STRUCTURE
2-1.1
LATERAL BALANCE IS 1 IPS OR GREATER DURING
GROUND TRACKING
2-1.7
TRACKING IS ERRATIC AFTER SEVERAL ATTEMPTS
2-1.8
BLADE CHANGES MORE THAN 1 INCH BETWEEN GROUND
AND HOVER
2-1.9
DYNAMIC ABSORBER
CTR VIB ABSORB CIRCUIT BREAKER WILL NOT STAY
CLOSED
2-2.4
LH VIB ABSORB CIRCUIT BREAKER WILL NOT STAY
CLOSED
2-2.4
NO INDICATION ON TEST BOX METER WHEN TEST SWITCH
IS SET TO EXTEND OR RETRACT, SWITCH AT CENTER
2-2.4
NO INDICATION ON TEST BOX METER WHEN TEST SWITCH
IS SET TO EXTEND OR RETRACT, SWITCH AT LEFT
2-2.4
NO INDICATION ON TEST BOX WHEN TEST SWITCH IS SET
TO EXTEND OR RETRACT, SWITCH AT RIGHT
2-2.4
RH VIB ABSORB CIRCUIT BREAKER WILL NOT STAY
CLOSED
2-2.4
TEST BOX METER INDICATES ONE DIRECTION BUT NOT
EXTEND AND RETRACT WHEN TEST SWITCH IS SET TO EX-
TEND AND RETRACT, SWITCH AT CENTER
2-2.4
TEST BOX METER INDICATES ONE DIRECTION BUT NOT
EXTEND AND RETRACT WHEN TEST SWITCH IS SET TO EX-
TEND AND RETRACT, SWITCH AT LEFT
2-2.4
TEST BOX METER INDICATES ONE DIRECTION BUT NOT
EXTEND AND RETRACT WHEN TEST SWITCH IS SET TO EX-
TEND AND RETRACT, SWITCH AT RIGHT
2-2.4
SYMPTOM
TASK
CHAPTER 3
PROXIMITY SWITCH
LEFT GROUND CONTACT LIGHT IS NOT LIT WHEN LEFT AFT
WHEEL IS ON THE GROUND
3-1.4
LEFT GROUND CONTACT LIGHT STAYS LIT WHEN LEFT AFT
WHEEL IS OFF THE GROUND
3-1.4
RIGHT GROUND CONTACT LIGHT IS NOT LIT WHEN RIGHT
AFT WHEEL IS ON THE GROUND
3-1.4
RIGHT GROUND CONTACT LIGHT STAYS LIT WHEN RIGHT
AFT WHEEL IS OFF THE GROUND
3-1.4
CHAPTER 4
ENGINE PERFORMANCE CHECK (WITHOUT 74)
DUAL ENGINE BEEP TRIM INCORRECT, ROTOR RPM BE-
TWEEN 94-96 PERCENT WITH ECLAT FLIGHT
4-1.1
NO. 1 ENGINE HIGH PTIT READING DURING START OR HOT
START
4-1.1
NO. 1 ENGINE GROUND IDLE SPEED BELOW 60 TO 63 PER-
CENT RPM
4-1.1
NO. 1 OR NO. 2 ENGINE HIGH PTIT
4-1.1
NO. 1 OR NO. 2 ENGINE N2 OVERSPEED OCCURS WHEN
ECL IS MOVED FROM GROUND IDLE TO FLIGHT
4-1.1
NO. 1 OR NO. 2 ENGINE OIL TEMP HIGH
4-1.1
NO. 1 OR NO. 2 ENGINE ROUGH OR SURGING ACCELERA-
TION FROM GROUND IDLE TO FLIGHT
4-1.1
NO. 2 ENGINE GROUND IDLE SPEED BELOW 60 TO 63 PER-
CENT RPM
4-1.1
NO. 2 ENGINE HIGH PTIT READING DURING START OR HOT
START
4-1.1
ROTOR RPM CHANGES MORE THAN +0 OR -2 PERCENT
OR ENGINE TORQUE SPLIT EXCEEDS 6 PERCENT DURING
HOVER
4-1.1
ENGINE ANTI-ICE SYSTEM (WITHOUT 74)
ENG NO. 1 OR NO. 2 ANTI-ICE CIRCUIT BREAKER WILL NOT
STAY CLOSED
4-2.4
NO. 1 ENGINE ANTI-ICING VALVE DOES NOT OPERATE
(CLICK NOT HEARD)
4-2.4
SYMPTOM
TASK
NO. 2 ENGINE ANTI-ICING VALVE DOES NOT OPERATE
(CLICK NOT HEARD)
4-2.4
ENGINE LOW OIL LEVEL WARNING SYSTEM (WITHOUT 74 )
NO. 1 OR NO. 2 ENGINE LOW OIL CAUTION LIGHTS DO NOT
COME ON
4-3.3
ENGINE START AND IGNITION SYSTEM (WITHOUT 74 )
ENGINE NO. 1 IGN CIRCUIT BREAKER DOES NOT STAY
CLOSED
4-4.4
ENGINE NO. 1 START & TEMP CIRCUIT BREAKER DOES
NOT STAY CLOSED
4-4.4
ENGINE NO. 2 IGN CIRCUIT BREAKER DOES NOT STAY
CLOSED
4-4.4
ENGINE NO. 2 START & TEMP CIRCUIT BREAKER DOES
NOT STAY CLOSED
4-4.4
ENGINE 1 STARTER ON LIGHT DOES NOT COME ON
4-4.4
ENGINE 2 STARTER ON LIGHT DOES NOT COME ON
4-4.4
NO. 1 ENGINE DOES NOT MOTOR (GAS PRODUCER TA-
CHOMETER DOES NOT INDICATE 10 TO 15% N1)
4-4.4
NO. 1 ENGINE DOES NOT START (ENGINE FUEL SYSTEM
FAILURE)
4-4.4
NO. 1 ENGINE DOES NOT START (ENGINE IGNITION SYS-
TEM FAILURE)
4-4.4
NO. 1 ENGINE MOTORS NORMALLY BUT DOES NOT START
4-4.4
NO. 2 ENGINE DOES NOT MOTOR (GAS PRODUCER TA-
CHOMETER DOES NOT INDICATE 10 TO 15% N1)
4-4.4
NO. 2 ENGINE DOES NOT START (ENGINE FUEL SYSTEM
FAILURE)
4-4.4
NO. 2 ENGINE DOES NOT START (ENGINE IGNITION SYS-
TEM FAILURE)
4-4.4
NO. 2 ENGINE MOTORS NORMALLY BUT DOES NOT START
4-4.4
GAS PRODUCER CONTROL SYSTEM (N1) (WITHOUT 74 )
ENGINE NO. 1 OR NO. 2 COND CONT CIRCUIT BREAKER
WILL NOT STAY CLOSED
4-5.3
NO. 1 ENGINE FUEL CONTROL POINTER NOT AT GROUND
BAND
4-5.3
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Change 17 1-3
