Pilot Debrief

BEECH E35 near West Yellowstone, MT — 2013-08-12

Final reportWPR13FA368
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Date
2013-08-12
Location
West Yellowstone, MT, USA
Airport
WYS
Aircraft
BEECH E35
Registration
N3226C
Category
Airplane
Highest injury
Fatal
Fatalities
1
Phase of flight
Approach

Probable cause

The pilot's failure to maintain airplane control while aligning the airplane with the runway for landing, which resulted in the airplane exceeding its critical angle of attack and experiencing an aerodynamic stall. Contributing to the accident was the pilot's distraction during landing due to the effects of an inoperative generator.

Contributing factors

Contributing to the accident was the pilot's distraction during landing due to the effects of an inoperative generator.

NTSB narrative

During a cross country flight, the pilot diverted to another airport. An airport employee who witnessed the accident reported that the pilot made several attempts to contact the airport over the common traffic advisory frequency; however, the pilot did not respond to replies from airport personnel. The airplane made a low pass heading south over the runway with the landing gear extended. After flying out of view, the airplane returned heading north over the parking ramp, about 50-75 feet above ground level. According to the witness, the pilot made a left turn to land but overflew final approach and was attempting to correct and line up with the runway when the airplane stalled and descended in a nose-low attitude to ground impact. It is likely that the critical angle of attack was exceeded during the turn, which resulted in the stall. Postaccident examination of the wreckage revealed several indications of an electrical problem: the manual fuel pump handle was extended from its stowed position; the manual landing gear hand crank was engaged; and, although the flap switch was in the extend position, the flaps were not extended. When the airplane's generator was placed on a test stand, it failed to produce power. No other mechanical malfunctions or failures with the airframe or engine were found that would have precluded normal operation. The generator failure was likely the reason that the pilot diverted from his planned route. After the generator failed, limited electrical power would have remained for a short time via the battery, allowing the pilot to transmit over the radio. However, the radio's volume knob was found in the lowest volume setting, which was likely the reason that the pilot did not hear airport personnel responding to his radio calls. It is likely that the generator failure distracted the pilot and contributed to his failure to maintain airplane control while landing.

Analysis

Primary failure mode
Human factors
First missed decision gate
Pilot failed to maintain proper communication and situational awareness during approach.

NTSB coding

Evidence available

  • 7 docket documents
View NTSB final reportView NTSB docket

Docket documents7

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