Service difficulty report · Pressure Switch · Boeing 747273C

Difficulty date
December 15, 2011
Submitted
December 20, 2011
Operation
Air carrier
Aircraft
N470EV
Make and model
Boeing 747273C
Aircraft serial
20653
Engine
Pwa JT9D7J
Part
Pressure Switch
Condition
Loose
Location
Engine Oil Sys
Stage of operation
DE
How discovered
O
Nature of condition
K, J
Precautionary procedure
E

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

What was found

NR 3 OIL QUANTITY INDICATOR DROPPED TO ZERO AT 7000, OIL PRESSURE FLUCTUATED +/- 10 PSI. ENGINE SHUTDOWN. PERFORMED ENGINE WINDMILLING INSPECTION IAW MM 72-00-00 PAGE 846. FOUND LOW OIL PRESSURE SWITCH LOOSE, RETORQUED PER MM 79-33-01. OP'S AND LEAK CHECKED NORMAL, TROUBLE SHOT AND LEAK CHECKED NORMAL PER 71-00-00 AND 71-00-44.