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Altitude deviation altitude excursion occurs after atx twin experiences a double engine stoppage due to in-flight encounter with snow conditions.
| Attributes | |
| ACN | 199490 |
| Time | |
| Date | 199201 |
| Day | Fri |
| Local Time Of Day | 0001 To 0600 |
| Place | |
| Locale Reference | atc facility : buf |
| State Reference | NY |
| Altitude | msl bound lower : 2200 msl bound upper : 4000 |
| Environment | |
| Flight Conditions | Marginal |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | tracon : buf |
| Operator | common carrier : air taxi |
| Make Model Name | Small Transport, Low Wing, 2 Recip Eng |
| Flight Phase | cruise other other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air taxi |
| Function | flight crew : single pilot |
| Qualification | pilot : atp pilot : commercial pilot : instrument |
| Experience | flight time last 90 days : 50 flight time total : 4200 |
| ASRS Report | 199490 |
| Person 2 | |
| Affiliation | Other |
| Function | observation : observer observation : passenger |
| Qualification | pilot : commercial pilot : cfi |
| Experience | flight time last 90 days : 120 flight time total : 1575 flight time type : 40 |
| ASRS Report | 199675 |
| Events | |
| Anomaly | aircraft equipment problem : critical inflight encounter : weather non adherence : published procedure other anomaly |
| Independent Detector | other flight crewa |
| Resolutory Action | aircraft : equipment problem dissipated |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Weather |
| Air Traffic Incident | Pilot Deviation other |
Narrative:
At AB55 am on jan/fri/92, approximately 25 mi east of buffalo on a flight from utica to buffalo, IFR at 4000 ft, the right engine on our small transport started running rough. At that time, I turned on the fuel pumps, enriched the mixtures and brought the propellers forward and turned on the alternate airs. 5 mins later the left engine quit followed by the right engine. I declared an emergency with ATC and started a spiraling descent over the akron airport. At approximately 2300 ft MSL, 1500 ft AGL, both engines regained full power and we proceeded to buffalo for a normal landing. After the engines had failed, I had switched fuel tanks and turned on xfeed with no change. Maintenance believes throttle body icing was the cause of the power failure. After the incident while reviewing the numbers it became aware to me that I had been operating the aircraft in excess of the 0 fuel weight. To prevent this from happening again, I would recommend having the alternate air doors open before entering icing conditions of any kind, and be aware of all weight limits, such as 0 fuel weight. Contributing factors are -8 degrees C lake effect. Snow light to moderate intensity. Supplemental information from acn 199675: both engines started running and a climb was started with a normal landing at buffalo, ny (buf). Fuel was in all tanks. The air filters were clogged with snow. We feel the cause was both air filters clogged with snow and the fuel injection system ice or throttle plate ice. There was no airframe ice.
Original NASA ASRS Text
Title: ALTDEV ALT EXCURSION OCCURS AFTER ATX TWIN EXPERIENCES A DOUBLE ENG STOPPAGE DUE TO INFLT ENCOUNTER WITH SNOW CONDITIONS.
Narrative: AT AB55 AM ON JAN/FRI/92, APPROX 25 MI E OF BUFFALO ON A FLT FROM UTICA TO BUFFALO, IFR AT 4000 FT, THE R ENG ON OUR SMT STARTED RUNNING ROUGH. AT THAT TIME, I TURNED ON THE FUEL PUMPS, ENRICHED THE MIXTURES AND BROUGHT THE PROPS FORWARD AND TURNED ON THE ALTERNATE AIRS. 5 MINS LATER THE L ENG QUIT FOLLOWED BY THE R ENG. I DECLARED AN EMER WITH ATC AND STARTED A SPIRALING DSCNT OVER THE AKRON ARPT. AT APPROX 2300 FT MSL, 1500 FT AGL, BOTH ENGS REGAINED FULL PWR AND WE PROCEEDED TO BUFFALO FOR A NORMAL LNDG. AFTER THE ENGS HAD FAILED, I HAD SWITCHED FUEL TANKS AND TURNED ON XFEED WITH NO CHANGE. MAINT BELIEVES THROTTLE BODY ICING WAS THE CAUSE OF THE PWR FAILURE. AFTER THE INCIDENT WHILE REVIEWING THE NUMBERS IT BECAME AWARE TO ME THAT I HAD BEEN OPERATING THE ACFT IN EXCESS OF THE 0 FUEL WT. TO PREVENT THIS FROM HAPPENING AGAIN, I WOULD RECOMMEND HAVING THE ALTERNATE AIR DOORS OPEN BEFORE ENTERING ICING CONDITIONS OF ANY KIND, AND BE AWARE OF ALL WT LIMITS, SUCH AS 0 FUEL WT. CONTRIBUTING FACTORS ARE -8 DEGS C LAKE EFFECT. SNOW LIGHT TO MODERATE INTENSITY. SUPPLEMENTAL INFO FROM ACN 199675: BOTH ENGS STARTED RUNNING AND A CLB WAS STARTED WITH A NORMAL LNDG AT BUFFALO, NY (BUF). FUEL WAS IN ALL TANKS. THE AIR FILTERS WERE CLOGGED WITH SNOW. WE FEEL THE CAUSE WAS BOTH AIR FILTERS CLOGGED WITH SNOW AND THE FUEL INJECTION SYS ICE OR THROTTLE PLATE ICE. THERE WAS NO AIRFRAME ICE.
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.