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ASN Wikibase Occurrence # 141858
Last updated: 18 October 2019
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Date:11-JAN-2012
Time:10:00
Type:Silhouette image of generic C150 model; specific model in this crash may look slightly different
Cessna 150G
Owner/operator:Tenle Aviation
Registration: N4041J
C/n / msn: 15065341
Fatalities:Fatalities: 0 / Occupants: 2
Aircraft damage: Substantial
Category:Accident
Location:A half-mile northwest of Fitchburg Municipal Airport, MA - KFIT/FIT -   United States of America
Phase: Initial climb
Nature:Training
Departure airport:Fitchburg, MA (FIT)
Destination airport:Fitchburg, MA (FIT)
Investigating agency: NTSB
Narrative:
On the day of the accident, the student pilot conducted a touch-and-go landing and then entered the traffic pattern to perform another one. While on the downwind leg of the traffic pattern, the engine began to run roughly, so the student applied carburetor heat and kept it on until touchdown. During climb after the second touch-and-go landing, the engine began running roughly again. Subsequently, the flight instructor took control of the airplane, lowered the angle-of-attack, and reapplied carburetor heat. According to the flight instructor, the engine subsequently ran more roughly, so he immediately placed the carburetor heat to “off.” He stated that, although the engine then ran less roughly, it still ran roughly. The flight instructor decided that there was not sufficient remaining runway to “land.” He was not sure how much power the engine was producing or if he could maintain level flight. He stated that he thought about turning back but decided against it. He said that the airplane was low and slow, so he decided to continue straight ahead. He tried to keep the airplane flying and was successful for about 15 to 20 seconds, but then he observed a warehouse ahead and banked to the right to avoid it. The airplane then settled and struck trees, substantially damaging the airplane and seriously injuring the student pilot.

Examination of the airplane and engine revealed no evidence of any preimpact mechanical failure or malfunction that would have precluded normal operation. However, a postaccident review of weather data and a carburetor icing probability chart also revealed that, at the time of the accident, the ambient temperature and dew point favored serious icing. Industry and Federal Aviation Administration guidance advised pilots to be aware of the warning signs of carburetor ice, including loss of rpm (with a fixed-pitch propeller) and rough running (both of which occurred before the accident), and advised that the pilot should respond to these warning signs by immediately applying full carburetor heat, and that the engine may initially run roughly for a short time while the ice melts. Therefore, the flight instructor should not have turned off the carburetor heat when the engine was still running roughly after he turned it on.
Probable Cause: A partial loss of engine power due to the formation of carburetor ice and the flight instructor's improper application of carburetor heat.

Sources:

NTSB: https://www.ntsb.gov/_layouts/ntsb.aviation/brief.aspx?ev_id=20120111X05220&key=1


Revision history:

Date/timeContributorUpdates
11-Jan-2012 11:33 gerard57 Added
11-Jan-2012 17:03 Geno Updated [Aircraft type, Registration, Cn, Operator, Location, Nature, Departure airport, Source, Narrative]
11-Jan-2012 22:49 FLYINGBROTHER1 Updated [Time, Aircraft type, Registration, Cn, Operator, Location, Departure airport, Source, Damage]
12-Jan-2012 03:31 RobertMB Updated [Location, Phase, Nature, Source, Narrative]
12-Jan-2012 09:09 Geno Updated [Source, Narrative]
12-Jan-2012 12:01 Geno Updated [Narrative]
12-Jan-2012 12:10 Penu Updated [Time, Aircraft type, Registration, Cn, Operator, Location, Phase, Nature, Departure airport, Destination airport, Source, Narrative]
27-Jan-2012 21:18 Geno Updated [Time, Source, Narrative]
21-Dec-2016 19:26 ASN Update Bot Updated [Time, Damage, Category, Investigating agency]
27-Nov-2017 17:53 ASN Update Bot Updated [Operator, Other fatalities, Departure airport, Destination airport, Source, Narrative]

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