SDR ASAA2017021519835

Service difficulty report · Regulator · Boeing 737890

Difficulty date: February 15, 2017
Submitted: February 17, 2017
Operation: Air carrier
Aircraft: N565AS
Make and model: Boeing 737890
Aircraft serial: 35181
Aircraft time: 39,036 hours, 11,822 cycles
System (JASC): 3610 · Pneumatic Distribution System
Part: Regulator
Part number: 1074847
Part serial: 4193
Condition: Faulted
Location: Duct Pressure
Part time: 56,364 hours, 24,681 cycles
Stage of operation: TX
How discovered: O
Nature of condition: J
Precautionary procedure: O

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

What was found

LEFT DUCT PRESSURE IS 10 PSI AT IDLE TRUST ON THE GROUND. ACFT GROUNDED. ACCOMPLISHED THE PNEUMATIC SYSTEM TROUBLESHOOTING IAW AMM 36-11-00-700-804 - NO DEFECTS WERE NOTED. REMOVED AND REPLACED THE NR 1 ENG HIGH STAGE VALVE IAW AMM 36-11-06-00-000-801 AND 36-11-06-400-801 AND THE HIGH STAGE REGULATOR IAW AMM 36-11-07-000-801 AND 36-11-07-400-801 FOR TROUBLESHOOTING. RAN BOTH ENGINES, PNEUMATIC DUCT PRESSURE WAS 20 PSI AT GROUND IDLE. GROUND VERIFIED GOOD. OKAY FOR SERVICE.