457. EXCESSIVE TORSIONAL VIBRATION AND NR DROOP OCCURS DURING FLIGHT 457 (ENGINE 1 NP LAGS BEHIND ENGINE 2 NP DURING RECOVERY MANEUVER) (cont)

457. EXCESSIVE TORSIONAL VIBRATION AND NR DROOP OCCURS DURING FLIGHT 457 (ENGINE 1 NP LAGS BEHIND ENGINE 2 NP DURING RECOVERY MANEUVER)

458. EXCESSIVE TORSIONAL VIBRATION AND NR DROOP OCCURS DURING FLIGHT 458 (ENGINE 2 NP LAGS BEHIND ENGINE 1 NP DURING RECOVERY MANEUVER)

TM-1-1520-238-T-4 Army Model AH-64 Helicopter (NSN
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TM 1-1520-238-T-4 4–146 4–57. EXCESSIVE TORSIONAL VIBRATION AND N_R DROOP OCCURS DURING FLIGHT – 4–57 (ENGINE 1 N_P LAGS BEHIND ENGINE 2 N_P DURING RECOVERY MANEUVER) (cont) 6. Check for open between: J21–35 and P1121–4, J21–33 and P1121–5, J21–34 and P1121–6. Does open exist? YES Repair open wire. Go to paragraph 4–12. NO Replace collective potentiometer position transducer (TM 1-1520-238-23). END OF TASK

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