Pilot Debrief

PORBECK JOHN M SLIPSTREAM GENESIS near Bryan, TX — 2011-08-13

Final reportCEN11LA672
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Date
2011-08-13
Location
Bryan, TX, USA
Airport
CFD
Aircraft
PORBECK JOHN M SLIPSTREAM GENESIS
Registration
N53QB
Category
Airplane
Highest injury
Serious
Fatalities
0
Phase of flight
Initial climb

Probable cause

The pilot’s failure to maintain adequate airspeed and attitude during a turn toward downwind, which resulted in an aerodynamic stall. Contributing to the accident was the pilot's limited experience in the experimental airplane.

NTSB narrative

After a detailed preflight inspection and runup of the experimental airplane, the pilot intended to do solo pattern work before giving the airplane's owner a bi-annual flight review. The owner watched the airplane takeoff and start to climb, then turn toward a left crosswind to enter the pattern downwind. The owner stated that the airplane would have been encountering a quartering tailwind of about 6-7 knots during the turn to downwind. He then saw the left wing losing lift and the right wing tipping upward at the same time, and the airplane quickly losing altitude. The airplane was operating with full engine power. The airplane then impacted the ground and skidded about 49 yards along a grassy area before coming to rest. After the accident, the pilot stated that just after the airplane cleared the ground during takeoff, he began a climb and turned toward a downwind position. The airplane then suddenly began to stall. After adding power, the airplane started to recover, but the altitude was too low to complete the recovery. Examination of the airplane wreckage did not reveal any mechanical malfunctions or failures with the engine, airframe, or flight controls that would have precluded normal operation. The pilot had a total time of 2,300 flight hours; however, he only had about 1.5 total hours in the accident airplane. He had flown the airplane 2 days before the accident flight for about 1 hour, and the accident flight was his second flight in the airplane. It is likely that the pilot was not sufficiently familiar with the flight characteristics of the light experimental airplane.

Analysis

Primary failure mode
Loss of control
First missed decision gate
Pilot could have aborted the takeoff after sensing loss of lift.

NTSB coding

Evidence available

  • Photos
  • 6 docket documents
View NTSB final reportView NTSB docket

Docket documents6

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