SDR 97ZZZM649

Service difficulty report · Sequence Valve · Boeing 747212B

Difficulty date
February 22, 1997
Submitted
March 26, 2000
Operation
Air carrier
Aircraft
N485EV
Make and model
Boeing 747212B
Aircraft serial
20712
Part
Sequence Valve
Part number
26702887
Condition
Failed
Location
Nlg
Part time
79,517 hours
Stage of operation
CL
Nature of condition
E, J
Precautionary procedure
O

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

What was found

JED - AFTER T/O, ON L/G RETRACTION, WHEN GEAR HANDLE WAS PLACED TO OFF. ENCOUNTERED WIND NOISE AND VIBRATION FROM N/G AREA. DOOR OPEN INDICATIONS, PRIMARY/SECONDARY N/G DOOR OPEN LIGHT ILLUMINATED ON AND OFF TOGETHER, ACCOMPANIED BY HYDRAULIC PERSSURE BUMPS. ALL INDICATIONS NORMAL ON GEAR EXTENSION. REPLACED NOSE GEAR OPERATED SEQUENCE VALVES. REFERENCE EIAA970034.

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