Service difficulty report · Oil System · Boeing 737823

Difficulty date
December 23, 2025
Submitted
December 29, 2025
Operation
Air carrier
Aircraft
N956NN
Make and model
Boeing 737823
Aircraft serial
31200
Aircraft time
33,868 hours, 14,091 cycles
Engine
Cfmint CFM567B20
Engine time
33,868 hours, 14,091 cycles
Part
Oil System
Condition
Leaking
Location
Nr 2 Engine
Stage of operation
DE
How discovered
O
Nature of condition
K, B
Precautionary procedure
O

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

What was found

AIRCRAFT WAS GROUNDED: STRONG ODOR REPORTED BY NR 2 FLIGHT ATTENDANT DESCENDING THROUGH 8,000 FEET. NO ODOR IN THE FLIGHT DECK. ALL FLIGHT ATTENDANTS MENTIONED SIMILAR SMELL ON TAKE OFF ODOR SIMILAR TO DIRTY SOCKS OR WET DOG SMELL. MAINTENANCE FOUND THE #2 ENGINE LEAKING OIL INTERNALLY AND REPLACED IT PER TASK CARD 08L40072003. A SATISFACTORY LEAK / OPERATIONAL CHECK WAS ACCOMPLISHED WITH NO ISSUES NOTED.