SDR USAA951044

Service difficulty report · Controller · Boeing 7672B7

Difficulty date: October 1, 1995
Submitted: March 26, 2000
Operation: Air carrier
Aircraft: N656US
Make and model: Boeing 7672B7
Aircraft serial: 26847
System (JASC): 2131 · Cabin Pressure Controller
Part: Controller
Part number: 21173886
Condition: Failed
Location: Cabin
Part time: 9,829 hours
Stage of operation: CL
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

FRA - FL 817, IMMEDIATELY AFTER TAKEOFF FROM FRA, THE AUTO INOP LIGHT ILLUMINATED AND THE EICAS MESSAGES 'CABIN ALT AUTO 1/2' AND 'CABIN AUTO INOP' ILLUMINATED. FLIGHT RETURNED TO FRA AND LANDED WITH NO FURTHER INCIDENT. THE NR 1 PRESSURE CONTROL UNIT FAULTED ON BITE AND WAS REPLACED. ALSO, AS A PRECAUTION, THE OUTFLOW VALVE ASSEMBLY WAS REPLACED. (M)

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