SDR AALA201710059008

Service difficulty report · Thermocouple · Airbus A321231

Difficulty date: October 3, 2017
Submitted: October 5, 2017
Operation: Air carrier
Aircraft: N143AN
Make and model: Airbus A321231
Aircraft serial: 6745
Aircraft time: 7,310 hours, 2,746 cycles
Engine: Iae V2533A5
System (JASC): 7320 · Fuel Controlling System
Part: Thermocouple
Part number: 73984200
Condition: Faulty
Location: Nr 1 Engine
Stage of operation: DE
How discovered: 9
Nature of condition: O
Precautionary procedure: O

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

What was found

DURING IDLE DESCENT, THE NR 1 ENGINE CARRIED BETWEEN 9 AND 15 PERCENT HIGHER N1 THAN THE NR 2 ENGINE AUTOTHROTTLE ON OR OFF, MADE NO DIFFERENCE. WHEN POWER WAS ADDED FOR LEVEL OFF, ENGINES MATCHED PERFECTLY. MAINTENANCE REPLACED THE NR 1 ENGINE FUEL THERMOCOUPLE IAW AMM 73-35-15. ACCOMPLISHED SATISFACTORY OPERATIONAL CHECKS.

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