Service difficulty report · A/C Pack · Boeing 757224

Difficulty date
June 16, 2023
Submitted
June 22, 2023
Operation
Air carrier
Aircraft
N58101
Make and model
Boeing 757224
Aircraft serial
27291
Aircraft time
109,769 hours, 23,524 cycles
Part
A/C Pack
Part number
UNKNOWN
Condition
Restricted
Location
Left
Stage of operation
CL
How discovered
O
Nature of condition
J, O
Precautionary procedure
A, O

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

What was found

L PACK NO AIRFLOW OR TEMPERATURE CONTROL L ENG BLEED CLOSED WHEN PACK WAS TURNED OFF OPERATING NORMALLY. "FLT DECK TEMP" AUTO EVENT ON ECS PAGE. ALL BITE CHECK PASS, NO FAULTS. OPERATED REGULATION SYSTEM, THE COOLING SYSTEM AND THE REVERSE FLOW BOTH PACKS IN AUTO & STNBY MODES, NO FAULTS. ALL CABIN TEMPS PROTECTION SYSTEM ON # 1 ENGINE. PERFORMED PNEUMATIC SYSTEM DYNAMIC TEST AS PER PARAMETERS WITHIN LIMITS. MM-36-11-00-700-801 TO CHECK HI-STAGE EXTRACTION SYSTEM,THE REGULATION SYSTEM, THE COOLING SYSTEM AND THE REVERSE FLOW PROTECTION SYSTEM ON # 1 ENGINE. NO FAULTS NOTED.