SDR CALA2025070906386

Service difficulty report · Bleed Air Sys · Boeing 777222

Difficulty date: July 7, 2025
Submitted: July 9, 2025
Operation: Air carrier
Aircraft: N780UA
Make and model: Boeing 777222
Aircraft serial: 26944
Aircraft time: 103,389 hours, 18,811 cycles
System (JASC): 3610 · Pneumatic Distribution System
Part: Bleed Air Sys
Condition: Leaking
Location: Zone 600
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

BLEED LOSS WING R EICAS ADVISORY BLEED AIR SUPPLY VALVES ARE LATCHED CLOSED OR THE RESPECTIVE SWI TCHES ARE OFF, SO THAT BLEED AIR IS NOT SUPPLIED TO THE R WAI, R PACK AND R HYDRAULIC RESERVOIR PRESSURIZATION. AHM SHOWS DUAL RIGHT BLEED LOOPS 1+2 MSG 'S26-37083,26-39072. CHECKED THE RIGHT A/C BAY FOR BLEED AIR LEAKS WITH DUCT PRESSURE AT 30 PSI WITH PACKS ON. NO LEAKS FOUND. ACP FIRE TEST. FIRE/OVHT WARNING SIGNAL TEST PASSED REF AMM TASK 31-51-00-710-801.