Service difficulty report · Unknown · Boeing 75724APF

Difficulty date
March 17, 2026
Submitted
March 18, 2026
Operation
Air carrier
Aircraft
N446UP
Make and model
Boeing 75724APF
Aircraft serial
27735
Aircraft time
38,929 hours, 21,243 cycles
Part
Unknown
Condition
Odor
Location
Cockpit
Stage of operation
TO
How discovered
O
Nature of condition
B
Precautionary procedure
C

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

What was found

ON DEPARTURE, MAX PWR T/O , STRONG SMELL OF DIRTY SOCKS ON FLT DECK. PERSISTED UNTILL LEVEL OFF@ FL 360. REF FIM 21-00 TASK SUPPORT. REFERENCE: 21-00-01/301 ISOLATED SMELL TO RIGHT ENGINE BY ISOLATING BLEEDS AT HIGH POWER, NOTED TO ONLY OCCUR WHILE USING RIGHT ENGINE BLEED WITH RIGHT PACK, NO SMELL NOTED WITH LEFT ENGINE SYSTEM. C/W FIM ENGINE OIL/FUEL SMELL IDENTIFIED IN CABIN REFERENCE: 71-05 FAULT TREE 828 BLOCKS 1 THROUGH 4, AFTER REMOVING RIGHT HAND LOWER COMPRESSOR FAIRING NOTED OIL STAINING/RESIDUE ON COMPRESSOR CASE AT APPROX 5 O`CLOCK POSITION. FURTHER INSPECTION NEEDED FOR TROUBLESHOOTING.

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