SDR NACA2023011900001

Service difficulty report · Controller · Boeing 767323

Difficulty date: January 19, 2023
Submitted: January 24, 2023
Operation: Air carrier
Aircraft: N321CM
Make and model: Boeing 767323
Aircraft serial: 29431
Aircraft time: 86,441 hours, 14,635 cycles
System (JASC): 3610 · Pneumatic Distribution System
Part: Controller
Part number: 79275515
Part serial: 930353
Condition: Failed
Location: Priority Valve
Part time: 3,047 hours, 714 cycles
Stage of operation: CR
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

DUCT PRESSURE ENGINE BLEED SPLIT, LEFT WAS @ 20 PSI, AND RIGHT WAS @ 35 PSI IN CRUISE AT 34,000 FT. PERFORMED FIM 36-10 FAULT TREE 830, PERFORMED AIR SUPPLY BITE, FOUND PRVC FAULT. REMOVED AND REPLACED PRV CONTROLLER PER AMM 36-11-19, INSTALLATION TEST AND LEAK TESTS GOOD.