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37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
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Attributes | |
ACN | 82580 |
Time | |
Date | 198802 |
Day | Tue |
Local Time Of Day | 0601 To 1200 |
Place | |
Locale Reference | atc facility : cvg |
State Reference | OH |
Altitude | msl bound lower : 15000 msl bound upper : 15000 |
Environment | |
Flight Conditions | IMC |
Light | Daylight |
Aircraft 1 | |
Operator | common carrier : air carrier |
Make Model Name | Light Transport, Low Wing, 2 Turboprop Eng |
Flight Phase | climbout : intermediate altitude |
Route In Use | enroute airway : zid |
Flight Plan | IFR |
Person 1 | |
Affiliation | company : air carrier |
Function | flight crew : captain oversight : pic |
Qualification | pilot : flight engineer pilot : cfi pilot : atp pilot : instrument |
Experience | flight time last 90 days : 270 flight time total : 6000 flight time type : 1000 |
ASRS Report | 82580 |
Person 2 | |
Affiliation | company : air carrier |
Function | flight crew : first officer |
Qualification | pilot : commercial pilot : instrument |
Experience | flight time last 90 days : 250 flight time total : 2600 |
ASRS Report | 82546 |
Events | |
Anomaly | aircraft equipment problem : critical |
Independent Detector | aircraft equipment other aircraft equipment : unspecified |
Resolutory Action | flight crew : declared emergency none taken : unable other |
Consequence | Other |
Supplementary | |
Primary Problem | Aircraft |
Narrative:
As the aircraft was climbing through 14500' MSL we got a triple chime and master warning. Looking at the left engine oil pressure gauge showed a low oil pressure of 20 psi. Crew examined all other engine indications were normal. Due to the extremely high rate of transducer failures on the light transport we honestly believed we were seeing an error in the oil pressure indicator thus no attempt was made to reduce engine power. 4 mins later the engine oil pressure dropped to 0, then we observed the engine oil temperature drop from 55 to 50 degrees C. Next came 10% torque fluctuations. Then the engine flamed out. All this happened from the first warning to flameout. In about 4 1/2 mins we then feathered the left engine, accomplished the emergency checklist and secured the engine. An emergency was declared and an uneventful landing was made at cmh. Contributing factors: aircraft high rate of false oil pressure warnings due to transducer failure & flight crews inability to distinguish actual oil pressure loss from that of a false warning. Suggested solution: install 2 separate transducers on the engine. 1 to send a signal to the oil pressure warning light on the warning panel and 1 to sent a signal to the oil pressure gauge. Supplemental information from acn 82546: there were less than 2 hours of flight time since the oil was checked full on the last flight. Engines are known for using or leaking oil! There was alot of oil in the exhaust pipe.
Original NASA ASRS Text
Title: ACR LTT INFLT ENGINE SHUTDOWN DUE LOSS OF OIL PRESSURE QUANTITY.
Narrative: AS THE ACFT WAS CLBING THROUGH 14500' MSL WE GOT A TRIPLE CHIME AND MASTER WARNING. LOOKING AT THE LEFT ENG OIL PRESSURE GAUGE SHOWED A LOW OIL PRESSURE OF 20 PSI. CREW EXAMINED ALL OTHER ENG INDICATIONS WERE NORMAL. DUE TO THE EXTREMELY HIGH RATE OF TRANSDUCER FAILURES ON THE LTT WE HONESTLY BELIEVED WE WERE SEEING AN ERROR IN THE OIL PRESSURE INDICATOR THUS NO ATTEMPT WAS MADE TO REDUCE ENG PWR. 4 MINS LATER THE ENG OIL PRESSURE DROPPED TO 0, THEN WE OBSERVED THE ENG OIL TEMP DROP FROM 55 TO 50 DEGS C. NEXT CAME 10% TORQUE FLUCTUATIONS. THEN THE ENG FLAMED OUT. ALL THIS HAPPENED FROM THE FIRST WARNING TO FLAMEOUT. IN ABOUT 4 1/2 MINS WE THEN FEATHERED THE LEFT ENG, ACCOMPLISHED THE EMER CHKLIST AND SECURED THE ENG. AN EMER WAS DECLARED AND AN UNEVENTFUL LNDG WAS MADE AT CMH. CONTRIBUTING FACTORS: ACFT HIGH RATE OF FALSE OIL PRESSURE WARNINGS DUE TO TRANSDUCER FAILURE & FLT CREWS INABILITY TO DISTINGUISH ACTUAL OIL PRESSURE LOSS FROM THAT OF A FALSE WARNING. SUGGESTED SOLUTION: INSTALL 2 SEPARATE TRANSDUCERS ON THE ENG. 1 TO SEND A SIGNAL TO THE OIL PRESSURE WARNING LIGHT ON THE WARNING PANEL AND 1 TO SENT A SIGNAL TO THE OIL PRESSURE GAUGE. SUPPLEMENTAL INFO FROM ACN 82546: THERE WERE LESS THAN 2 HRS OF FLT TIME SINCE THE OIL WAS CHKED FULL ON THE LAST FLT. ENGS ARE KNOWN FOR USING OR LEAKING OIL! THERE WAS ALOT OF OIL IN THE EXHAUST PIPE.
Data retrieved from NASA's ASRS site as of August 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.