Grob G103
San Antonio, TX — August 22, 2019
Event Information
| Date | August 22, 2019 |
| Event Type | ACC |
| NTSB Number | GAA19CA506 |
| Event ID | 20190823X03734 |
| Location | San Antonio, TX |
| Country | USA |
| Coordinates | 29.72333, -98.69444 |
| Airport | Boerne Stage Field |
| Highest Injury | NONE |
Aircraft
| Make | Grob |
| Model | G103 |
| Category | GLI |
| FAR Part | 091 |
| Aircraft Damage | SUBS |
Conditions
| Light Condition | DAYL |
| Weather | VMC |
Injuries
| Fatal | 0 |
| Serious | 0 |
| Minor | 0 |
| None | 1 |
| Total Injured | 0 |
Event Location
Probable Cause
The failure of the glider tow rope, which lodged in the glider's rudder and resulted in a hard landing. Contributing to the accident was the pilot's failure to properly secure the glider's aft canopy.
Full Narrative
The glider pilot reported that, while in tow and approaching 3,000ft AGL, the rear canopy opened. The glider pilot informed the tow airplane via radio of the open canopy, and the tow pilot informed the glider that he would try to tow the glider closer to the runway. Moments later, the glider entered an "uncontrollable downward spin," and the front canopy shattered. The pilot regained control of the glider, and he recalled that the rear canopy had separated from the glider. He made an extended right base and prepared for an off-airport landing. He reported that the flight controls were not responding properly, and the glider landed hard on the runway.
The pilot reported that after the accident he, found a section of the tow rope still connected to the glider, which was wrapped and inserted into the rudder mechanism.
Photographs received from FAA Inspectors showed that the tow rope exhibited overload signatures. Each airplane still had a portion of the tow rope attached to aircraft after the tow rope failure.
The glider sustained substantial damage to the composite fuselage.
About This NTSB Record
This aviation event was investigated by the National Transportation Safety Board (NTSB). NTSB investigates all U.S. civil aviation accidents to determine probable cause and issue safety recommendations to prevent future accidents.