SDR AALA202301236397

Service difficulty report · Controller · Boeing 777323ER

Difficulty date: January 19, 2023
Submitted: January 23, 2023
Operation: Air carrier
Aircraft: N720AN
Make and model: Boeing 777323ER
Aircraft serial: 33522
Aircraft time: 38,280 hours, 4,477 cycles
System (JASC): 3610 · Pneumatic Distribution System
Part: Controller
Condition: Failed
Location: Shutoff Valve
Stage of operation: CR
How discovered: O
Nature of condition: J
Precautionary procedure: A

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

What was found

AIRCRAFT WAS GROUNDED: LEFT ENGINE BLEED OFF LIGHT ILLUMINATED AT CRUISE. FLIGHT RETURNED TO JFK LANDING SAFELY. MAINTENANCE ACCOMPLISHED FIM TASK 36-11-00-810-805 DUE TO MAINTENANCE MESSAGE 36-10250, PRESSURE REGULATING AND SHUTOFF FAILED VALVE CLOSED. REMOVED AND REPLACED PRESSURE REGULATING SHUT OFF VALVE (PRSOV) CONTROLLER PER AMM 36-11-18.