Tuesday, August 03, 2021

Glasflugel 304S, N304AB: Accident occurred July 30, 2021 in Briggs, Burnet County, Texas

This is preliminary information, subject to change, and may contain errors. Any errors in this report will be corrected when the final report has been completed. 

The National Transportation Safety Board did not travel to the scene of this accident.

Additional Participating Entity: 
Federal Aviation Administration / Flight Standards District Office; San Antonio, Texas

Location: Briggs, TX
Accident Number: CEN21LA346
Date & Time: July 30, 2021, 14:40 Local
Registration: N304AB
Aircraft: HpH, Spol. S.R.O. Glasflügel 304S 
Injuries: 1 Serious
Flight Conducted Under: Part 91: General aviation - Personal

On July 30, 2021, about 1440 central daylight time, a HpH, Spol. S.R.O Glasflügel 304S experimental glider, N304AB, was substantially damaged when it was involved in an accident near Briggs, Texas. The pilot was seriously injured. The glider was operated as a Title 14 Code of Federal Regulations Part 91 personal flight.

According to the aerotow pilot, shortly after takeoff and while the tow plane was about 300 ft above the runway, the glider unexpectedly released from the tow rope. The glider then entered a left turn and landed in what appeared to be a wings level attitude. The tail boom and empennage separated during the landing. The tow rope appeared to be undamaged.

An examination of the glider revealed that the vertical elevator control rod, part no. 304S-46-12, had fractured about 0.75 inch above the lower clevis and a portion of the fractured control rod contained corrosion deposits. Additionally, the upper portion of the vertical elevator control rod exhibited a significant hole due to corrosion. The vertical elevator control rod was extracted from the vertical stabilizer and sent to the National Transportation Safety Board (NTSB) Materials Laboratory for further examination.

According to the maintenance logbook, on July 6, 2021, the glider was inspected and found to be in an airworthy condition. The aviation mechanic with inspector authorization noted in the corresponding logbook entry that he had “checked controls” and that the condition inspection had been completed in accordance with Federal Aviation Regulations Part 43, Appendix D.

Aircraft and Owner/Operator Information

Aircraft Make: HpH, Spol. S.R.O. 
Registration: N304AB
Model/Series: Glasflügel 304S
Aircraft Category: Glider
Amateur Built: No
Operator: On file 
Operating Certificate(s) Held: None
Operator Designator Code:

Meteorological Information and Flight Plan

Conditions at Accident Site: VMC 
Condition of Light: Day
Observation Facility, Elevation: KGRK,1015 ft msl 
Observation Time: 14:56 Local
Distance from Accident Site: 14 Nautical Miles 
Temperature/Dew Point: 33°C /20°C
Lowest Cloud Condition: Scattered / 6000 ft AGL
Wind Speed/Gusts, Direction: / ,
Lowest Ceiling: 
Visibility: 10 miles
Altimeter Setting: 30.06 inches Hg 
Type of Flight Plan Filed: None
Departure Point: Briggs, TX 
Destination: Briggs, TX

Wreckage and Impact Information

Crew Injuries: 1 Serious
Aircraft Damage: Substantial
Passenger Injuries:
Aircraft Fire: None
Ground Injuries:
Aircraft Explosion: None
Total Injuries: 1 Serious 
Latitude, Longitude: 30.856293,-97.945853 (est)





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