Saturday, April 22, 2017

Piper PA-44-180 Seminole, Plane Nonsense Inc., N190ND: Accident occurred July 07, 2016 at Dillant-Hopkins Airport (KEEN), Keene, Cheshire County, New Hampshire

Additional Participating Entity: 
Federal Aviation Administration / Flight Standards District Office; Portland, Maine 

Aviation Accident Final Report - National Transportation Safety Board:

Docket And Docket Items - National Transportation Safety Board:

Aviation Accident Data Summary - National Transportation Safety Board:

Plane Nonsense Inc:

NTSB Identification: GAA16CA377 
14 CFR Part 91: General Aviation
Accident occurred Thursday, July 07, 2016 in Keene, NH
Probable Cause Approval Date: 04/04/2017
Aircraft: PIPER PA 44, registration: N190ND
Injuries: 2 Uninjured.

NTSB investigators used data provided by various entities, including, but not limited to, the Federal Aviation Administration and/or the operator and did not travel in support of this investigation to prepare this aircraft accident report.

The flight instructor in the multiengine airplane reported that, during a simulated single-engine instrument approach to runway 2, the right engine was configured for the simulated failure. The instructor added that the goal was to perform a missed approach on one engine and note the airplane’s performance. The pilot under instruction descended to the decision height and executed the missed approach procedure, but the airplane would not climb. The flight instructor told the pilot to go to full power on both engines. According to the flight instructor, “mixtures, props and throttles were all full forward and the fuel flow levers were both at the ON position,” and he took control of the airplane. 

The flight instructor reported that there were trees and buildings to the north and that he made a left turn about 400 ft above ground level with the intent to land on runway 14. He extended the landing gear but realized that he would not reach the runway. He executed a forced landing to the southwest on taxiway Sierra, the airplane crossed over runway 32/14, and although heavy braking was applied, the airplane exited the taxiway and impacted a drainage culvert. The airplane sustained substantial damage to the aft fuselage stringers and longerons.

The airport elevation was 488 ft, the density altitude was 2,120 ft, the temperature was 81°, the dew point was 66° F, and the wind was calm, and the flight instructor stated that carburetor heat was not used during the approach on either engine. 

The relative humidity was about 60 percent, and the weather conditions were conducive to serious icing probability when operating in a gliding flight profile.

The National Transportation Safety Board determines the probable cause(s) of this accident as follows:
The flight instructor’s failure to use carburetor heat during the approach while operating in atmospheric conditions that were conducive to carburetor icing, which resulted in a loss of engine power due to carburetor icing.

Per the AOPA Carburetor Ice Probability Chart, the relative humidity was about 60 percent and there was serious icing probability when operating in a gliding flight profile.

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