SDR UIEA2019060704412

Service difficulty report · Ecu · Boeing 7673S1

Difficulty date: June 7, 2019
Submitted: June 7, 2019
Operation: Air carrier
Aircraft: N640GT
Make and model: Boeing 7673S1
Aircraft serial: 25221
Aircraft time: 88,459 hours, 18,801 cycles
System (JASC): 4940 · APU Start/Ignition System
Part: Ecu
Part number: 211734220
Part serial: 78934
Condition: Malfunctioned
Location: Apu
Stage of operation: IN
How discovered: 9
Nature of condition: O
Precautionary procedure: K

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

What was found

APU AUTO SHUTDOWN. REMOVED AND REPLACED APU SURGE BLEED VALVE IAW AMM 49-53-01, NO HELP, APU SURGES INTERMITTENTLY. PERFORMED FIM 49-11 FT 958, FOUND ECU FAULTING DELTA SENSOR FLOW SENSING MODULE AND IGV ACTUATOR. REMOVED AND REPLACED APU ECU. OPERATIONAL CHECKS NORMAL IAW AMM 49-11-00-01.

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