Pilot Debrief

AEROFAB INC LAKE LA-4-250 near Auburndale, FL — 2021-12-17

Final reportERA22LA090
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Date
2021-12-17
Location
Auburndale, FL, USA
Aircraft
AEROFAB INC LAKE LA-4-250
Registration
N1402C
Category
Airplane
Highest injury
Fatal
Fatalities
2
Phase of flight
Descent

Probable cause

A bird strike, which resulted in a loss of control while flying at low altitude over a lake.

NTSB narrative

The pilot departed from a lake near his residence, about 5 nautical miles southeast of the accident site, for a local flight. About 53 minutes after departure, the airplane overflew another lake at an altitude of about 825 ft above mean sea level. After a slight right turn, the airplane rapidly descended and impacted the water. First responders recovered floating debris and found the carcass of a turkey vulture in the debris field. During recovery of the airplane, feathers were found wrapped around the fuel cap and filler neck of the right wing fuel tank, suggestive of a bird strike. Examination of the wreckage did not reveal any pre-impact anomalies with the airplane that would have precluded normal operation. Although two witnesses reported observing potential problems with the engine, describing its noise as “struggling to develop full power” and “making a sputtering noise”, the damage to the propeller blades, which included leading edge gouging, chordwise scratch marks, and “S” bending, were consistent with the engine rotating and under power at the time of impact. No additional bird remnants or impact marks were found that would conclusively explain precisely how a bird strike (or strikes) may have led to a loss of control. However, the presence of the bird carcass in the debris field, which was located about 0.1 nautical miles southwest of where the airplane began its rapid descent, suggests that bird likely remained with the airplane after being struck by it. No remnants of the windscreen were recovered with the airplane wreckage, which suggests the possibility that a bird (or birds) may have penetrated the cockpit. Given the bird remnants found on the airplane and at the accident site, along with the wreckage examination that did not identify any pre-impact anomalies with the airplane or engine, it is likely that a bird strike led to the loss of control.

Analysis

Primary failure mode
Engine power loss
First missed decision gate
Pilot could have aborted the flight upon noticing engine issues.

NTSB coding

Evidence available

  • ADS-B / radar
  • 10 docket documents
View NTSB final reportView NTSB docket

Docket documents10

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