Aircraft equipment problem. Broken gear box bolt caused loss of oil. Engine shutdown and uneventful ...

Attributes
ACN	341846
Time
Date	199607
Day	Wed
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : phl
State Reference	PA
Altitude	msl bound lower : 33000 msl bound upper : 33000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zob
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Flight Phase	cruise other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : cfi pilot : atp pilot : flight engineer
Experience	flight time last 90 days : 180 flight time total : 6100 flight time type : 1200
ASRS Report	341846
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	other flight crewa
Resolutory Action	none taken : unable
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

At leveloff, noticed decreasing oil quantity #2 engine. Loss rate approximately 1 quart, 3-4 mins. Talked with company. They suspected bad quantity gauge. Pressure and temperature were good. Considered pit as possible diversion airport. Continued anyway until quantity read zero. Pressure and temperature remained green arc for another 15 mins, then pressure started to fluctuate. Shut down engine, diverted to phl since it was closest, and were heavy weight 103500 pounds. Flew single engine approach, flaps 15 degrees. Landed uneventfully. Bolt head had broken off of gear box.

Original NASA ASRS Text

Title: ACFT EQUIP PROB. BROKEN GEAR BOX BOLT CAUSED LOSS OF OIL. ENG SHUTDOWN AND UNEVENTFUL SINGLE ENG LNDG.

Narrative: AT LEVELOFF, NOTICED DECREASING OIL QUANTITY #2 ENG. LOSS RATE APPROX 1 QUART, 3-4 MINS. TALKED WITH COMPANY. THEY SUSPECTED BAD QUANTITY GAUGE. PRESSURE AND TEMP WERE GOOD. CONSIDERED PIT AS POSSIBLE DIVERSION ARPT. CONTINUED ANYWAY UNTIL QUANTITY READ ZERO. PRESSURE AND TEMP REMAINED GREEN ARC FOR ANOTHER 15 MINS, THEN PRESSURE STARTED TO FLUCTUATE. SHUT DOWN ENG, DIVERTED TO PHL SINCE IT WAS CLOSEST, AND WERE HVY WT 103500 LBS. FLEW SINGLE ENG APCH, FLAPS 15 DEGS. LANDED UNEVENTFULLY. BOLT HEAD HAD BROKEN OFF OF GEAR BOX.

Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.

Aircraft equipment problem. Broken gear box bolt caused loss of oil. Engine shutdown and uneventful single engine landing.