Porbeck John M SLIPSTREAM GENESIS N53QB

Summary

On 13 August 2011 at about 12:20 local time, a Porbeck John M SLIPSTREAM GENESIS registered N53QB, operated by Joseph Maxim, was involved in an accident near Bryan, Texas, United States. One person was on board and one was seriously injured. The aircraft was substantially damaged. The NTSB has published a probable cause for this accident; it is quoted in full below.

Date

13 August 2011 at 12:20

Classification

Accident

Location

Bryan, Texas, United States

Nearest airport

Coulter Field (CFD)

Coordinates

30.7156, -96.3311

Aircraft

Porbeck John M SLIPSTREAM GENESIS

Registration

N53QB

Category

Airplane

Engines

1

Operator

Joseph Maxim

Operating rule

Part 91: General Aviation

Purpose of flight

Personal

Phase of flight

Not recorded

Route

Bryan → Bryan

Aircraft damage

Substantial

Weather

VMC

Light

Day

NTSB number

CEN11LA672

1 person was seriously injured.

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.

Quoted verbatim from the NTSB record. This site does not paraphrase or interpret it.

Read the full 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.

Quoted verbatim from the NTSB record.