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 GO TO NEXT PAGE Change 17  1-3