# Accident 19990828036779A: Grob G103CTWINIII, San Antonio, TX, August 28, 1999

- Type: FAA accident report (Accident/Incident Data System), as reported
- Date: August 28, 1999, 13:00 local time
- Place: San Antonio, TX
- Airport: Boerne Stage Field Airport
- Damage: Substantial damage
- Phase of flight: Final Approach
- Operating rules: General operating rules (Part 91)
- Location: 29.8008° N, 98.7291° W: From the FAA, an estimate near the named town, within about 3 miles
- Nearby events: https://openairdocs.org/map.md?lat=29.8008&lon=-98.7291&mi=10
- Aircraft: N103MS, a cancelled registration (https://openairdocs.org/deregistered/N103MS-2011-01-28) (OpenAirDocs)
- Registry model: Burkhart Grob G103C TWIN III ACRO (registry code 1660207, https://openairdocs.org/model/burkhart-grob-g103c-twin-iii-acro) (OpenAirDocs)
- Registry engine: NONE (registry code 00000, https://openairdocs.org/engine/none) (OpenAirDocs)
- Reported make and model: GROB G103CTWINIII
- Fatal injuries: 0
- Pilot certificates: Student
- Pilot flight hours: 15 total, 15 in this make and model, 15 in the last 90 days
- NTSB investigation: [NTSB FTW99LA238](https://openairdocs.org/ntsb/FTW99LA238) (OpenAirDocs)
- FAA source: FAA Aviation Safety Information Portal (https://asip.faa.gov/)
- Page: https://openairdocs.org/incident/19990828036779A

## Narrative

As the FAA filed it, in capitals; the FAA replaces private details with ^PRIVACY DATA OMITTED^.

(.4) THE WING OF THE GLIDER STRUCK A TREE WHEN THE SOLO STUDENT PILOT WAS CORRECTING THE FLIGHT PATH TO ALIGN THE GLIDER WITH THE RUNWAY CENTERLINE DURING THE FINAL APPROACH. THE DENSITY ALTITUDE WAS CALCULATED AT 4,215 FEET. THE STUDENT PILOT HAD 15.2 HOURS OF TOTAL FLIGHT TIME IN GLIDERS. HE WAS ENDORSED FOR SOLO FLIGHT AND HAD 2.4 HOURS OF SOLO FLIGHT TIME IN THE GLIDER. THE OPERATOR REPORTED THAT THE ACCIDENT COULD HAVE BEEN PREVENTED BY `MAINTAIN[ING] ADEQUATE CLEARANCE OVER OBSTACLES.'

## The NTSB's investigation of this event (1)

From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date, checked against the reported serial number, make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model.

- [NTSB FTW99LA238](https://openairdocs.org/ntsb/FTW99LA238), Aug 28, 1999: Burkhart Grob 103C (N103MS), San Antonio, TX, substantial damage. Probable cause: The pilot's failure to attain proper runway alignment of the glider resulting in failure to maintain obstacle clearance. A factor was the high density altitude.

## Other reports on N103MS (1)

Matched to the same aircraft by N-number and date.

- [Accident 20090614016819A](https://openairdocs.org/incident/20090614016819A), Jun 14, 2009: Grob G103CTWINIII (N103MS), Gregory, MI, Substantial damage, 1 fatal. Ground launch tow cable broke on lauch/takeoff. Aircraft did not achieve sufficient altitude to continue normal flight. Pilot initiated a 180 degree turn to…

From the FAA Accident/Incident Data System. Reports are matched to registry aircraft by N-number and event date, checked against the reported make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model. For accidents, the NTSB's own investigation is the fuller record.

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