Service difficulty report · Oil Cooler · Boeing 737890

Difficulty date
October 26, 2021
Submitted
October 26, 2021
Operation
Air carrier
Aircraft
N588AS
Make and model
Boeing 737890
Aircraft serial
35685
Aircraft time
49,378 hours, 14,699 cycles
Part
Oil Cooler
Part number
1605642
Part serial
4451
Condition
None
Location
Apu
Part time
11,036 hours, 19,335 cycles
Stage of operation
NR
How discovered
O
Nature of condition
O
Precautionary procedure
K

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

What was found

APU OIL MONITORING DATA SHOWS OIL CONSUMPTION TO BE TRENDING HIGHER THAN EXPECTED. GROUNDED - YES. PERFORMED THOROUGH GVI OF APU, FOUND BACKSIDE OF APU OIL COOLER SATURATED WITH OIL. REMOVED AND REPLACED APU OIL COOLER REF AMM 49-91-41. LEAK CHECK GOOD. THIS CLEARS TSR 711239, SEAMC DAVE NOTIFIED.