Post flight, preflight inspection by the flight crew revealed large oil leak from both engines.

Attributes
ACN	316395
Time
Date	199509
Day	Mon
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : ykm
State Reference	WA
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : ind
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 135
Flight Phase	ground : preflight other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	other other : other pilot : atp pilot : cfi
Experience	flight time last 90 days : 180 flight time total : 4400 flight time type : 2800
ASRS Report	316395
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	other flight crewa
Resolutory Action	none taken : detected after the fact
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

Picked up aircraft from maintenance, performed first flight of day system checks, fueled and preflted aircraft and flew revenue flight from ykm-sea. Upon landing in sea, large amounts of oil were observed leaking from both engines, oil was also observed on cowls, wings, flaps and inside landing gear wheel wells. Mechanics were called, and removed cowls and observed an oil line on both engines (the same line on each side) disconnected. 4 1/2 quarts oil added to engines to bring them to normal levels. Oil was cleaned from aircraft and a leak check performed. The aircraft had just been released from a #4 detail check and a routine check. As I understand it, they were under time pressure to finish this procedure, and some basic maintenance procedures were overlooked. Apparently the oil system was never leak checked after the lines were removed for whatever reason. A maintenance inspector is supposed to check the mechanic's work before (aircraft) is released for flight. This also wasn't followed. We had no indications of any problems. All temperatures, pressure and instruments were normal. Had the flight been longer than 30 mins, we would have been faced with a dual engine failure. Not a pleasant thought. It's not always the pilot's fault.

Original NASA ASRS Text

Title: POST FLT, PREFLT INSPECTION BY THE FLC REVEALED LARGE OIL LEAK FROM BOTH ENGS.

Narrative: PICKED UP ACFT FROM MAINT, PERFORMED FIRST FLT OF DAY SYS CHKS, FUELED AND PREFLTED ACFT AND FLEW REVENUE FLT FROM YKM-SEA. UPON LNDG IN SEA, LARGE AMOUNTS OF OIL WERE OBSERVED LEAKING FROM BOTH ENGS, OIL WAS ALSO OBSERVED ON COWLS, WINGS, FLAPS AND INSIDE LNDG GEAR WHEEL WELLS. MECHS WERE CALLED, AND REMOVED COWLS AND OBSERVED AN OIL LINE ON BOTH ENGS (THE SAME LINE ON EACH SIDE) DISCONNECTED. 4 1/2 QUARTS OIL ADDED TO ENGS TO BRING THEM TO NORMAL LEVELS. OIL WAS CLEANED FROM ACFT AND A LEAK CHK PERFORMED. THE ACFT HAD JUST BEEN RELEASED FROM A #4 DETAIL CHK AND A ROUTINE CHK. AS I UNDERSTAND IT, THEY WERE UNDER TIME PRESSURE TO FINISH THIS PROC, AND SOME BASIC MAINT PROCS WERE OVERLOOKED. APPARENTLY THE OIL SYS WAS NEVER LEAK CHKED AFTER THE LINES WERE REMOVED FOR WHATEVER REASON. A MAINT INSPECTOR IS SUPPOSED TO CHK THE MECH'S WORK BEFORE (ACFT) IS RELEASED FOR FLT. THIS ALSO WASN'T FOLLOWED. WE HAD NO INDICATIONS OF ANY PROBS. ALL TEMPS, PRESSURE AND INSTS WERE NORMAL. HAD THE FLT BEEN LONGER THAN 30 MINS, WE WOULD HAVE BEEN FACED WITH A DUAL ENG FAILURE. NOT A PLEASANT THOUGHT. IT'S NOT ALWAYS THE PLT'S FAULT.

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.