SDR ASAA2023011741554

Service difficulty report · Bleed Valve · Boeing 737990ER

Difficulty date: January 17, 2023
Submitted: January 18, 2023
Operation: Air carrier
Aircraft: N478AS
Make and model: Boeing 737990ER
Aircraft serial: 44105
Aircraft time: 27,851 hours, 8,810 cycles
Engine: Cfmint CFM567B27E
System (JASC): 7532 · Compressor Bleed Valve
Part: Bleed Valve
Part number: 1074926
Part serial: 17496
Condition: Faulted
Location: Nr 1 Engine
Part time: 27,851 hours, 8,810 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

WHILE WORKING T/C N84360001, FOUND #1 ENG BLEED AIR REGULATOR DEFECTIVE. FAILED DURING SUBTASK 836-201. OVER PRESSURE SWITCH TEST. GROUNDED - YES. REMOVED AND REPLACED THE #1 ENG BLEED AIR REGULATOR REF B737-900 AMM 36-11-03. LEAK CHECK OF THE #1 ENG BLEED AIR REG PER AMM 36-11-03 AND 36-11-00-710-801 GOOD.