Service difficulty report · Heat Exchanger · Boeing 757231

Difficulty date
February 13, 2024
Submitted
February 14, 2024
Operation
Air carrier
Aircraft
N721TW
Make and model
Boeing 757231
Aircraft serial
29954
Aircraft time
87,324 hours, 22,525 cycles
Part
Heat Exchanger
Part number
1942723
Part serial
4303
Condition
Failed
Location
A/C Bay
Part time
44,991 hours, 7,386 cycles
Stage of operation
CR
How discovered
O
Nature of condition
J
Precautionary procedure
B, A

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

What was found

SHIP 6810 -DIV/PRES/DE- DUE UNABLE TO MAINTAIN CABIN PRESSURE WITH LEFT PACK ON MEL. CORRECTIVE ACTION: R/R ACM, R/R HEAT EXCHANGERS, R/R PLENUM ASSY, R/R CABIN PRESSURE CONTROLLER, R/R LT PK DUCT, RPLCD 2 BELLY DRAINS. CK AND CLEANED DOOR SEALS OF 1R AND 4R DOORS. CLEANED & RESEATED CARGO DOOR SEALS ON FWD & AFT CARGO DOOR. C/W PACK CONFIDENCE OPS CK, ALL ODI C/W.