Service difficulty report · Sensor · Boeing 737990ER

Difficulty date
October 14, 2014
Submitted
October 21, 2014
Operation
Air carrier
Aircraft
N413AS
Make and model
Boeing 737990ER
Aircraft serial
35205
Aircraft time
6,320 hours, 1,974 cycles
Part
Sensor
Part number
1296943
Part serial
15197
Condition
Malfunctioned
Location
Nr 2 Bleed
Part time
6,320 hours, 1,974 cycles
Stage of operation
CL
How discovered
O
Nature of condition
J
Precautionary procedure
A

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

What was found

RIGHT BLEED TRIP OFF, LIGHT ILLUMINATED AFTER TAKEOFF WHILE ESTABLISHING BLEEDS. ACFT GROUNDED. DIVERSION TIME-22 MINUTES. ACCOMPLISHED WRENCH CHECK ON PRSOV, HIGH STAGE AND PRE-COOLER CONTROL VALVES. NO DEFECTS NOTED. REPLACED HIGH STAGE VALVE IAW AMM 36-11-06, HIGH STAGE REGULATOR IAW AMM 36-11-07 AND BLEED AIR REGULATOR IAW AMM 36-11-03. ALL PARTS OPS CHECKS GOOD. FIRST VERIFICATION FLIGHT, ACCOMPLSHED A NO BLEEDS TAKEOFF AFTER RE-ESTABLISHING NORMAL BLEEDS WHILE STILL IN CLIMBOUT. RT SIDE BLEED TRIP OFF REILLUMINATED. WE ACCOMPLISHED THE BLEED TRIP OFF QRH CHECKLIST AND THE LIGHT STAYED EXTINGUISHED. REPLACED 390 SENSOR IAW MM 36-12-02-000-801 & 450 SENSOR IAW MM 36-11-05-400-801, PRECOOLER CONTROL VALVE IAW 36-12-02-400-801 & ACAU IAW MM 21-51-02-400-801. NO LEAKS NOTED DURING IDLE RUN. GROUND VERIFICATION DURING HIGH POWER ENG RUN IAW AMM 36-11-00 ENG BLEED AIR CROSSOVER OPS TEST GOOD. ALL PRESSURES WITHIN NORMAL RANGE. SECOND VERIFICATION FLIGHT SUCCESSFUL.