Coulter Field Airport
Aircraft Accident/Incident Report

Bryan, Texas 77808
Saturday, August 13, 2011 7:20 CDT

NTSB Narrative Summary Released at Completion of Accident

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.

NTSB Probable Cause Narrative

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.

Event Information

Type of Event Accident
Event Date 8/13/2011
Event Day of the Week Saturday
Time of Event 720
Event Time Zone Central Daylight Time
Event City Bryan
Event State TEXAS
Event Country --
Zipcode of the event site 77808
Event Date Year 2011
Event Date Month 8
MidAir Collision Indicator No
On Ground Collision occurred ? No
Event Location Latitude 304256N
Event Location Longitude 0961952W
Event Location Airport Coulter Field
Event Location Nearest Airport ID CFD
Indicates whether the acc/inc occurred off or on an airport Off Airport/Airstrip
Distance from airport in statute miles --
Degrees magnetic from airport --
Airport Elevation --
Weather Briefing Completeness --
Investigator's weather source Witness
Time of the weather observation 715 Central Standard Time
Direction of event from weather observation facility (degrees) 240
Weather Observation Facility ID CFD
Elevation of weather observation facility 456
Distance of event from weather observation facility (units?) 1
Time Zone of the weather observation CST
Lighting Conditions Day
Lowest Ceiling Height --
Lowest Non-Ceiling Height --
Sky/Lowest/Cloud Conditions Clear
Sky Condition for Lowest Ceiling None
Visibility Runway Visual Range (Feet) --
Visibility Runway Visual Value (Statute Miles) --
Visibility (Statute Miles) 10
Air Temperature at event time (in degrees celsius) 27
Dew Point at event time (in degress fahrenheit) 15
Wind Direction (degrees magnetic) 200
Variable Wind Indicator Wind direction could be determined
Wind Speed (knots) 7
Wind Velocity Indicator --
Wind Gust Indicator Not Gusting
Wind Gust (knots) --
Altimeter Setting at event time (in. Hg) 30
Density Altitude (feet) --
Intensity of Precipitation --
METAR weather report --
Event Highest Injury Serious
On Ground, Fatal Injuries --
On Ground, Minor Injuries --
On Ground, Serious Injuries --
Injury Total Fatal --
Injury Total Minor --
Injury Total None --
Injury Total Serious 1
Injury Total All 1
Investigating Agency NTSB
NTSB Docket Number (internal use) 31608
NTSB Notification Source FAA Operations Center
NTSB Notification Date --
NTSB Notification Time --
Fiche Number and/or location -used to find docket information --
Date of most recent change to record Sep 3 2013 12:06PM
User who most recently changed record coln
Basic weather conditions Visual Meteorological Cond
FAA District Office --

Aircraft Involved

Aircraft #1

Aircraft Registration Number N53QB
NTSB Number CEN11LA672
Missing Aircraft Indicator --
Federal Aviation Reg. Part Part 91: General Aviation
Type of Flight Plan filed Unknown
Flight plan Was Activated? --
Damage Substantial
Aircraft Fire None
Aircraft Explosion None
Aircraft Manufacturer's Full Name PORBECK JOHN M
Aircraft Model SLIPSTREAM GENESIS
Aircraft Series Identifier --
Aircraft Serial Number JMP-01
Certified Max Gross Weight 1320
Aircraft Category Airplane
Aircraft Registration Class --
Aircraft is a homebuilt? Yes
Flight Crew Seats 1
Cabin Crew Seats --
Passenger Seats 1
Total number of seats on the aircraft 2
Number of Engines 1
Fixed gear or retractable gear Fixed
Aircraft, Type of Last Inspection Conditional
Date of Last Inspection --
Airframe hours since last inspection --
Airframe Hours 60
ELT Installed Yes
ELT Activated No
ELT Aided Location of Event Site No
ELT Type --
Aircraft Owner Name Joseph Maxim
Aircraft Owner Street Address --
Aircraft Owner City Bryan
Aircraft Owner State TX
Aircraft Owner Country USA
Aircraft Owner Zipcode 77803
Operator is an individual? No
Operator Name Joseph Maxim
Operator Same as Owner? Yes
Operator Is Doing Business As --
Operator Address Same as Owner? Yes
Operator Street Address --
Operator City Bryan
Operator State TX
Operator Country USA
Operator Zip code 77803
Operator Code --
Owner has at least one certificate None
Other Operator of large aircraft? No
Certified for Part 133 or 137 Operation --
Operator Certificate Number --
Indicates whether an air carrier operation was scheduled or not --
Indicates Domestic or International Flight --
Operator carrying Pax/Cargo/Mail --
Type of Flying (Per_Bus / Primary) Personal
Second Pilot on Board No
Departure Point Same as Event Yes
Departure Airport Code CFD
Departure City Bryan
Departure State TX
Departure Country USA
Departure Time 733
Departure Time Zone CDT
Destination Same as Local Flt dest & departure same, accident can occur anywhere
Destination Airport Code CFD
Destination City Bryan
Destination State TX
Destination Country USA
Specific Phase of Flight --
Report sent to ICAO? --
Evacuation occurred --
Date of most recent change to record Jun 30 2013 3:39PM
User who most recently changed record lema
Since inspection or accident Last Inspection
Event Location Runway Number and Location N/A
Runway Length --
Runway Width --
Sight Seeing flight No
Air Medical Flight No
Medical Flight --