SDR FDEA202207231791

Service difficulty report · Duct · Boeing 757

Difficulty date: July 23, 2022
Submitted: July 25, 2022
Operation: Air carrier
Aircraft: N947FD
Make and model: Boeing 757
Aircraft serial: 24882
Aircraft time: 59,818 hours, 30,092 cycles
System (JASC): 2130 · Cabin Pressure Control System
Part: Duct
Condition: Failed
Component: None
Stage of operation: CR
How discovered: O
Nature of condition: J
Precautionary procedure: B

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

What was found

PDIS 947 21-30 0875 22JUL22 PHL FACT U CABIN ALT MASTER WARNING AT FL350. C/W QRH CONTINUED CRUISE AT FL250 WITH CABIN ALT AT 8500. EMER DECL, ALSO TRIED ALT AUTO MODE WITH NO CHANGE ***EMERGENCY DECLARED*** FACT 23JUL22 15:06 PHL U REPLACED LEFT PACK WATER SEPERATOR DUCT IAW AMM 21-51-04-4. RAN ENGINE IAW B757 QRH/ MM 71-00-00-865 PERFORMED PRESSURIZATION TEST IAW AMM 21-31-00-5 SYSTEM TEST NORMAL NO FAULTS, A/C OK FOR SERVICE