Air carrier has loss of oil pressure due to breather test port cap being off and in engine cowl.

Attributes
ACN	286936
Time
Date	199410
Day	Sat
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : atl
State Reference	GA
Altitude	agl bound lower : 0 agl bound upper : 0
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	other personnel other
Qualification	other other : other
ASRS Report	286936
Person 2
Affiliation	company : air carrier
Function	other personnel other
Qualification	other other : other
Events
Anomaly	aircraft equipment problem : critical non adherence : published procedure
Independent Detector	aircraft equipment other aircraft equipment : unspecified
Resolutory Action	none taken : detected after the fact
Consequence	Other Other
Supplementary
Air Traffic Incident	other

Narrative:

Airline aircraft has right engine loss of oil pressure on landing in detroit. Problem found was loss of oil quantity due to breather test port cap was off and in engine cowl. This engine was ran in atl test cell after heavy maintenance. Myself and another mechanic (mr. Abc) ran this engine. Abc installed this cap after test and engine ran again and leak checked. The sign off for this cap in the paperwork is to cover all caps installed. I signed off this step because I was the computer operator on this run. This engine was run again after installing on aircraft and leak checked again. Aircraft landed without incident. This is not a common problem. Maybe he thought he had tightened cap enough. It's hard to reach cap behind fuel manifold. Maybe if cap was torque with a torque wrench and, or safetied, this would stop any further occurrences.

Original NASA ASRS Text

Title: ACR HAS LOSS OF OIL PRESSURE DUE TO BREATHER TEST PORT CAP BEING OFF AND IN ENG COWL.

Narrative: AIRLINE ACFT HAS R ENG LOSS OF OIL PRESSURE ON LNDG IN DETROIT. PROBLEM FOUND WAS LOSS OF OIL QUANTITY DUE TO BREATHER TEST PORT CAP WAS OFF AND IN ENG COWL. THIS ENG WAS RAN IN ATL TEST CELL AFTER HVY MAINT. MYSELF AND ANOTHER MECH (MR. ABC) RAN THIS ENG. ABC INSTALLED THIS CAP AFTER TEST AND ENG RAN AGAIN AND LEAK CHKED. THE SIGN OFF FOR THIS CAP IN THE PAPERWORK IS TO COVER ALL CAPS INSTALLED. I SIGNED OFF THIS STEP BECAUSE I WAS THE COMPUTER OPERATOR ON THIS RUN. THIS ENG WAS RUN AGAIN AFTER INSTALLING ON ACFT AND LEAK CHKED AGAIN. ACFT LANDED WITHOUT INCIDENT. THIS IS NOT A COMMON PROB. MAYBE HE THOUGHT HE HAD TIGHTENED CAP ENOUGH. IT'S HARD TO REACH CAP BEHIND FUEL MANIFOLD. MAYBE IF CAP WAS TORQUE WITH A TORQUE WRENCH AND, OR SAFETIED, THIS WOULD STOP ANY FURTHER OCCURRENCES.

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.