Service difficulty report · Control Valve · Boeing 737890

Difficulty date
March 31, 2016
Submitted
April 4, 2016
Operation
Air carrier
Aircraft
N593AS
Make and model
Boeing 737890
Aircraft serial
35107
Aircraft time
30,862 hours, 9,471 cycles
Part
Control Valve
Part number
3989084
Part serial
19205
Condition
Failed
Location
Right Ecs Bay
Part time
7,480 hours, 2,217 cycles
Stage of operation
NR
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

RIGHT PACK TRIP. WILL NOT RESET. ACFT GROUNDED. ACCOMPLISHED BITE PROCEDURE OF ZONE/TEMP CONTROLLERS IAW FIM 21-62, TASK 801. NO DEFECTS NOTED IN ANY PORTION OF TEST. REMOVED PANEL 192BR, RAM AIR DUCT PANEL AND INSPECTED HEAT EXCHANGER FOR DEBRIS AND BLOCKAGE. NO ANOMALIES NOTED. CHECKED RIGHT PACK DISCHARGE SWITCH S935, RT ACM OVERHEAT THERMAL SWITCH S939, AND RT COMPRESSOR DISCHARGE OVERHEAT SWITCH S5 FOR OPEN CONDITION. ALL SWITCHES ARE OPEN AND IN NORMAL CONDITION. ENGINEERING REQUEST ACCOMPLISHED. R & R TEMPERATURE CONTROL VALVE FOR RT PACK. OPS CHECK & LEAK CHECK GOOD REF AMM 21-51-10. NO DAMAGE NOTED TO HEAT EXCHANGER, DIFFUSER, OR RAM AIR DUCTS.