SDR 9514336310

Service difficulty report · Pressure Switch · Boeing 747451

Difficulty date
September 8, 1995
Submitted
March 26, 2000
Operation
Air carrier
Aircraft
N670US
Make and model
Boeing 747451
Aircraft serial
24225
Engine
Pwa PW4056
Part
Pressure Switch
Condition
Malfunctioned
Location
Nr 3 Engine
Stage of operation
CL
Nature of condition
N
Precautionary procedure
A, E, J

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

What was found

DURING CLIMB, THE NR 3 ENGINE OIL FILTER BYPASS LIGHT ILLUMINATED. THE ENGINE WAS SHUTDOWN, 130,000 LBS OF FUEL WAS DUMPED, THE AIRCRAFT DIVERTED TO NRT AND LANDED WITHOUT INCIDENT. REPLACED THE OIL FILTER DIFFERENTIAL PRESSURE SWITCH AND OIL FILTER. OPERATIONAL CHECK OK.