SDR SWAA2026071320137

Service difficulty report · Fmu · Boeing 7378

Difficulty date: July 9, 2026
Submitted: July 14, 2026
Operation: Air carrier
Aircraft: N8789Q
Make and model: Boeing 7378
Aircraft serial: 67776
Aircraft time: 11,881 hours, 5,933 cycles
Engine: Cfmint LEAP1B28
System (JASC): 7320 · Fuel Controlling System
Part: Fmu
Condition: Fluctuates
Location: Nr 1 Engine
Stage of operation: AP
How discovered: O
Nature of condition: J
Precautionary procedure: O

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

What was found

NR 1 ENGINE THRUST ALERT APX 3 SECONDS FOLLOWED BY W/ENGINE INDICATIONS FLUCTUATING FLUCTUATING N1, EGT, N2, FF MINOR FLUCTUATIONS. IN DESCENT WITH PARTIAL THRUST APX 75% N1. INDICATIONS STABLE DURING APPROACH. ACCOMPLISHED IFIM 73-00-00-810-C05. REMOVED AND REPLACED NR 1 ENGINE FUEL METERING UNIT IAW AMM 73-21-04.

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