SDR ASAA2020121233687

Service difficulty report · Heat Exchanger · Boeing 737890

Difficulty date: December 12, 2020
Submitted: December 15, 2020
Operation: Air carrier
Aircraft: N584AS
Make and model: Boeing 737890
Aircraft serial: 35682
Aircraft time: 49,074 hours, 14,561 cycles
Engine: Cfmint CFM567B27B3
System (JASC): 7311 · Engine Fuel/Oil Cooler
Part: Heat Exchanger
Part number: 453328039
Part serial: YB029847D
Condition: Damaged
Location: Nr 1 Fuel/Oil
Part time: 41,723 hours, 15,688 cycles
Stage of operation: IN
How discovered: C
Nature of condition: L
Precautionary procedure: K

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

What was found

WHILE REPLACING NR 1 ENGINE FUEL PUMP PACKAGE FUEL/OIL HEAT EXCHANGER FAILED BOLT TORQUE LOCKING CHECK. GROUNDED-YES. REMOVED AND REPLACED MAIN OIL/FUEL HEAT EXCHANGER, IAW B-737-800 AMM 79-21-02-000-801-F00 AND AMM 79-21-02-400-801-F00. ACCOMPLISHED TESTS 12, 3A, 13 ON POWERPLANT TEST, REF TABLE. TEST ACTUATORS TEST GOOD, LEAK CHECK GOOD, EEC TEST GOOD.