Service difficulty report · Control Valve · Boeing 737890

Difficulty date
October 13, 2014
Submitted
October 17, 2014
Operation
Air carrier
Aircraft
N560AS
Make and model
Boeing 737890
Aircraft serial
35179
Aircraft time
31,315 hours, 9,564 cycles
Part
Control Valve
Part number
3966081
Part serial
2445
Condition
Failed
Location
Lt A/C Pack
Part time
31,323 hours, 9,570 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

CREW REPORTS N1 TARGET SPLIT ON FMS TAKEOFF PAGE. NOTED FMCS BITE DISCRETES SHOW NR 1 ENGINE BLEED VALVE "ON" IN BOTH IN BOTH POSITIONS. AFTER OPERATING PACKS FOUND LT ECS SHOWS ON ALL THE TIME, PACK ON OR OFF. ACFT GROUNDED. R & R LT FLOW CONTROL VALVE, REF AMM 21-51-01. DURING LEAK CHECK FOUND HOLE IN HOSE BETWEEN ACM AND TURBINE OUTLET MUFF MIXING DUCT. REPLACED HOSE LEAK CHECK GOOD, BITE CHECK GOOD.