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Aircraft equipment problem. High oil pressure forced oil past compressor bearing and into bleed air going to air cycle machine. Resulting smoke in aircraft caused flight crew to declare an emergency and return to departure airport for landing.
| Attributes | |
| ACN | 333706 |
| Time | |
| Date | 199604 |
| Day | Tue |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : mke |
| State Reference | WI |
| Altitude | msl bound lower : 3500 msl bound upper : 3500 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tower : mke |
| Operator | general aviation : personal |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Operating Under FAR Part | Part 91 |
| Flight Phase | climbout : intermediate altitude |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | Other |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : instrument pilot : commercial pilot : cfi pilot : atp |
| Experience | flight time last 90 days : 250 flight time type : 2400 |
| ASRS Report | 333706 |
| Person 2 | |
| Affiliation | Other |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : commercial |
| Events | |
| Anomaly | aircraft equipment problem : critical |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : declared emergency none taken : unable |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
Narrative:
After takeoff during initial climb we noticed smoke entering the aircraft from the air-conditioning ducts. I turned off the air valves and put on my oxygen mask, as did the copilot. After 2 or 3 miscoms with the tower we declared an emergency (we both transmitted at the same time). We flew the aircraft around the pattern for an uneventful landing and evacuate/evacuationed the aircraft on a taxiway. The aircraft was turned over to the fire department. No fire was found. I suspect a problem with the air cycle machine. It was later determined that something happened after takeoff in the engine (left) to cause the oil pressure to exceed 220 psi which forced oil past the #1 bearing letting oil get into the compressor and thus into the 28 bleed air which feeds the air cycle machine. The reason for the high oil pressure could not be found. The engine was changed.
Original NASA ASRS Text
Title: ACFT EQUIP PROB. HIGH OIL PRESSURE FORCED OIL PAST COMPRESSOR BEARING AND INTO BLEED AIR GOING TO AIR CYCLE MACHINE. RESULTING SMOKE IN ACFT CAUSED FLC TO DECLARE AN EMER AND RETURN TO DEP ARPT FOR LNDG.
Narrative: AFTER TKOF DURING INITIAL CLB WE NOTICED SMOKE ENTERING THE ACFT FROM THE AIR-CONDITIONING DUCTS. I TURNED OFF THE AIR VALVES AND PUT ON MY OXYGEN MASK, AS DID THE COPLT. AFTER 2 OR 3 MISCOMS WITH THE TWR WE DECLARED AN EMER (WE BOTH XMITTED AT THE SAME TIME). WE FLEW THE ACFT AROUND THE PATTERN FOR AN UNEVENTFUL LNDG AND EVACED THE ACFT ON A TXWY. THE ACFT WAS TURNED OVER TO THE FIRE DEPT. NO FIRE WAS FOUND. I SUSPECT A PROB WITH THE AIR CYCLE MACHINE. IT WAS LATER DETERMINED THAT SOMETHING HAPPENED AFTER TKOF IN THE ENG (L) TO CAUSE THE OIL PRESSURE TO EXCEED 220 PSI WHICH FORCED OIL PAST THE #1 BEARING LETTING OIL GET INTO THE COMPRESSOR AND THUS INTO THE 28 BLEED AIR WHICH FEEDS THE AIR CYCLE MACHINE. THE REASON FOR THE HIGH OIL PRESSURE COULD NOT BE FOUND. THE ENG WAS CHANGED.
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.