SDR NACA2025123000001

Service difficulty report · Actuator · Boeing 7673BG

Difficulty date: December 30, 2025
Submitted: January 13, 2026
Operation: Air carrier
Aircraft: N563NC
Make and model: Boeing 7673BG
Aircraft serial: 30563
Aircraft time: 86,717 hours, 22,239 cycles
System (JASC): 4930 · APU Engine Fuel and Control
Part: Actuator
Condition: Failed
Location: Apu Fuel Shutoff
Stage of operation: IN
How discovered: C
Nature of condition: L
Precautionary procedure: K

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

What was found

APU FUEL SHUT OFF VALVE FAILED AN OPS CHECK. APU FIRE SWITCH CHECK, DOES NOT CLOSE OR OPEN ELECTRICALLY. R & R THE APU SHUT OFF VALVE ACTUATOR IAW AMM 28-25-00-004-032, & AMM 28-25-02-404-008 STEPS 3.G. (3) - 3.G (8). PERFORMED APU FUEL FEED SYS TEST. TESTED GOOD IAW AMM 28-25-00-715-264.

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