SDR COEA2019082072810

Service difficulty report · Control Unit · Aerosp ATR72212

Difficulty date: August 17, 2019
Submitted: September 5, 2019
Operation: Air carrier
Aircraft: N810HC
Make and model: Aerosp ATR72212
Aircraft serial: 423
Aircraft time: 27,664 hours, 30,129 cycles
System (JASC): 6120 · Propeller Controlling System
Part: Control Unit
Part number: 8088777
Part serial: 940752
Condition: Faulted
Location: Nr 1 Propeller
Stage of operation: CR
How discovered: O
Nature of condition: R
Precautionary procedure: O

As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.

What was found

FLIGHT 1701, ENROUTE, AT 16,000 FT, THE NR 1 ENGINE TORQUE DROPPED FROM 70% TO 20% THEN RECOVERED. ALL OTHER PARAMETERS NORMAL. AFTER EXTENSIVE TROUBLESHOOTING, MAINTENANCE REPLACED THE NR 1 PROP CONTROL UNIT. ALL OPS & LEAKS CHECKS GOOD.

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