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GA small aircraft developed an engine surge while in cruise at 4000' in snow and rain. On descent to 3000' a manifold pressure increase was noted and the pilot requested priority handling and was vectored to teb.
| Attributes | |
| ACN | 176325 |
| Time | |
| Date | 199104 |
| Day | Sat |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : teb |
| State Reference | NY |
| Altitude | msl bound lower : 4000 msl bound upper : 4000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | tracon : n90 tower : ewr |
| Operator | general aviation : personal |
| Make Model Name | Small Aircraft, Low Wing, 1 Eng, Retractable Gear |
| Flight Phase | cruise other descent : approach descent other |
| Route In Use | enroute : on vectors enroute : direct |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | Other |
| Function | flight crew : single pilot |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 230 flight time total : 2800 flight time type : 1900 |
| ASRS Report | 176325 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : approach |
| Qualification | controller : radar |
| Events | |
| Anomaly | aircraft equipment problem : critical |
| Independent Detector | other flight crewa |
| Resolutory Action | aircraft : equipment problem dissipated flight crew : declared emergency flight crew : overcame equipment problem |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
Narrative:
While cruising at 4000' MSL, 25 mi northeast of teterboro airport, a slight fluctuation in manifold pressure and egt were noted. Flight conditions at 4000' were below freezing with moderate rain and snow. While being vectored for the VOR-24 approach at teterboro, clearance was given for a descent to 3000' MSL. Soon after leveling at 3000', a manifold pressure surge of approximately 3' was noted, and was corrected by a reduction in throttle. Due to night IMC flight conditions, I decided that the safest action at this point was to request priority handling from ATC. Ny approach then vectored the flight directly for the VOR approach at teterboro. During execution of the emergency checklist, the fuel selector valve was switched to another tank and the problem did not recur. A normal landing was made at teterboro.
Original NASA ASRS Text
Title: GA SMA DEVELOPED AN ENGINE SURGE WHILE IN CRUISE AT 4000' IN SNOW AND RAIN. ON DESCENT TO 3000' A MANIFOLD PRESSURE INCREASE WAS NOTED AND THE PLT REQUESTED PRIORITY HANDLING AND WAS VECTORED TO TEB.
Narrative: WHILE CRUISING AT 4000' MSL, 25 MI NE OF TETERBORO ARPT, A SLIGHT FLUCTUATION IN MANIFOLD PRESSURE AND EGT WERE NOTED. FLT CONDITIONS AT 4000' WERE BELOW FREEZING WITH MODERATE RAIN AND SNOW. WHILE BEING VECTORED FOR THE VOR-24 APCH AT TETERBORO, CLRNC WAS GIVEN FOR A DSNT TO 3000' MSL. SOON AFTER LEVELING AT 3000', A MANIFOLD PRESSURE SURGE OF APPROX 3' WAS NOTED, AND WAS CORRECTED BY A REDUCTION IN THROTTLE. DUE TO NIGHT IMC FLT CONDITIONS, I DECIDED THAT THE SAFEST ACTION AT THIS POINT WAS TO REQUEST PRIORITY HANDLING FROM ATC. NY APCH THEN VECTORED THE FLT DIRECTLY FOR THE VOR APCH AT TETERBORO. DURING EXECUTION OF THE EMER CHKLIST, THE FUEL SELECTOR VALVE WAS SWITCHED TO ANOTHER TANK AND THE PROB DID NOT RECUR. A NORMAL LNDG WAS MADE AT TETERBORO.
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.