Service difficulty report · Depressor · Boeing 76734AF

Difficulty date
December 25, 2023
Submitted
December 26, 2023
Operation
Air carrier
Aircraft
N330UP
Make and model
Boeing 76734AF
Aircraft serial
27756
Aircraft time
64,009 hours, 21,229 cycles
Part
Depressor
Part number
143T841523
Part serial
UNK
Condition
Unknown
Location
Unknown
Stage of operation
CR
How discovered
9
Nature of condition
O
Precautionary procedure
I

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

What was found

*ATB* CABIN ALTITUDE WARNING ALERT AT FL360 CABIN ALTITUDE AT 1600 FEET AND CLIMBING. RAN CABIN ALT CHECKLIST. DESCENDED LOWER ALTITUDE. RAN CABIN AUTOMATIC INOP CHECKLIST BECAUSE AUTO INOP ILLUMINATED RETU PREFORMED SYS TEST OF CABIN PRESSURE CONTROLLER PER FILM 21-31 FAULT TREE 803 NO CURRENT FAULTS FOUND OPS CHECK GOOD AT THIS TIME

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