SDR ASAA2020012231930

Service difficulty report · Valve · Boeing 737990ER

Difficulty date: December 13, 2019
Submitted: January 23, 2020
Operation: Air carrier
Aircraft: N419AS
Make and model: Boeing 737990ER
Aircraft serial: 41734
Aircraft time: 26,728 hours, 8,644 cycles
Engine: Cfmint CFM567B27E
System (JASC): 7520 · Engine Cooling System
Part: Valve
Part number: 32911866
Part serial: GRTS9302
Condition: Faulted
Location: Nr 2 Engine
Part time: 39,196 hours, 11,953 cycles
Stage of operation: IN
How discovered: 9
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

#2 ENG BITE HAS FAULT 75-20462 THE HPTACC DEMAND AND POSITION SIGNALS DISAGREE. ECONOMIC FAULT. DEFERRED PER T/C 78273000. GROUNDED - YES. REQUIRES T515 HPTC VALVE POSITION TRANSDUCER (HPTACC). REMOVED AND REPLACED #2 ENG. HPTACC REF. B737-900 AMM BOEING 75-21-01. ACCOMPLISHED TESTS 12 & 3A & 13, NO LK'S OR FAULTS NOTED. C/N 13015419 REMOVED. ALTERNATED DEACTIVATION PROCEDURE USED PER CHAPTER 5, TABLE 3, ITEM 8. ALTERNATE DEACTIVATION PROCEDURE REVERSED. C/N 130134419, 13017419, 13011419, & 18003419 REMOVED.