Service difficulty report · Heat Exchanger · Boeing 737990ER

Difficulty date
May 29, 2018
Submitted
June 1, 2018
Operation
Air carrier
Aircraft
N435AS
Make and model
Boeing 737990ER
Aircraft serial
43292
Aircraft time
18,427 hours, 6,078 cycles
Engine
Cfmint CFM567B27E
Part
Heat Exchanger
Part number
453328039
Part serial
YB043765
Condition
Leaking
Location
Nr 2 Engine
Part time
18,452 hours, 6,088 cycles
Stage of operation
IN
How discovered
V
Nature of condition
K
Precautionary procedure
K

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

What was found

DURING AN LL1 CHECK, FOUND FUEL DRIPPING FROM THE MAIN OIL/FUEL HEAT EXCHANGER PAD DRAIN, 7 DROPS PER MINUTE. ACFT GROUNDED. REPLACED THE NR 2 ENGINE MAIN OIL/FUEL HEAT EXCHANGER IAW AMM 79-21-02. LEAK CHECKED IAW POWERPLANT TEST REFERENCE TABLE, AMM 71-00-00-800-811-F00, OK. NO FURTHER DEFECTS NOTED.