Service difficulty report · Cabin Pressure · Boeing 7673S1

Difficulty date
April 18, 2016
Submitted
April 22, 2016
Operation
Air carrier
Aircraft
N640GT
Make and model
Boeing 7673S1
Aircraft serial
25221
Aircraft time
80,065 hours, 16,924 cycles
Part
Cabin Pressure
Condition
Failed
Stage of operation
DE
How discovered
O
Nature of condition
P
Precautionary procedure
K

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

What was found

PRESSURIZATION APPEARS TO HAVE FAILED ON DESCENT THROUGH 3,000 FT. OUTFLOW VLV OPENED FULLY & REMAINED FULL OPEN NO EICAS OR STATUS MSGS & NO FAULTS FOUND. PERFORMED BITE TEST CPC 1 & 2 IAW AMM 21-31-00, NO DEFECTS NOTED. ALSO PERFORMED MANUAL MODE CONTROL TEST IAW AMM 21-31-00 WITH ALL OPERATIONS NORMAL. ALSO VISUALLY INSPECTED OUTFLOW VLV FROM GND OK. REQUESTED PRESS SYS VERIFICATION FLIGHT. FLIGHT CREW INFORMED VERIFICATION FLIGHT SUCCESSFUL, ALL NORMAL.

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