VIBRATION FREQUENCY IDENTIFIED AS 675 CYCLES/MIN (3/REV) (Continued)

VIBRATION FREQUENCY IDENTIFIED AS 675 CYCLES/MIN (3/REV) (Continued) - TM-55-1520-240-T-1_159

2-1.5 VIBRATION FREQUENCY TOO RAPID TO COUNT, VIBRATION FELT IN STRUCTURE (6/REV)

TM-55-1520-240-T-1 CH-47D Heilcopter Manual
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TM 55-1520-240-T 2-1.4 VIBRATION FREQUENCY IDENTIFIED AS 675 CYCLES/MIN (3/REV) (Continued) 2 - 1 . 4 SET TEST BOX SELECTOR SWITCH TO LEFT. INCREASE REPLACE COPILOT’S DYNAMIC AND THEN DECREASE ROTOR ABSORBER. REFLY AT 130 RPM. DOES TEST BOX METER KNOTS. CHECK FOR VIBRA- POINTER MOVE TOWARD EX- TION. TEND AND THEN RETRACT? TIGHTEN BOLT OR REPLACE LOOSE BEARING. REFLY AT 130 KNOTS. CHECK FOR VIBRA- TION. CHECK PITCH LINK BEARINGS. ARE ANY BEARINGS WORN? REPLACE PITCH LINK HAVING WORN BEARINGS. REFLY AT 130 KNOTS. CHECK FOR VIBRA- TION. CHECK SWASHPLATE AND UNIBALL ASSEMBLIES FOR REPLACE WORN BEARINGS OR BEARING WEAR. ARE ANY UNIBALLS. REFLY AT 130 BEARINGS OR UNIBALLS KNOTS. CHECK FOR VIBRA- WORN? TION. TIGHTEN BOLTS TO REQUIRED CHECK PYLON SPLICE BOLTS. TORQUE. REFLY AT 130 ARE ANY LOOSE? KNOTS. CHECK FOR VIBRA- TION. CHECK ALL TRANSMISSIONS TO LOCATE TRANSMISSION WITH LOOSE BOLTS. TIGHTEN BOLTS TO REQUIRED TORQUE. REFLY AT 130 KNOTS. CHECK FOR VIBRATION. END OF TASK Change 5 2-11

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