# NTSB LAX89LA039: Aerospatiale TB-20, N94TB, Yucca Valley, CA, November 5, 1988

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Limited investigation · Final report
- Date: November 5, 1988, 14:30 local (21:30 UTC)
- Place: Yucca Valley, CA
- Coordinates: 34.150997, -116.410636 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=34.1510&lon=-116.4106&mi=10
- Phase of flight: [Initial climb](https://openairdocs.org/ntsb-phases/350) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 2 uninjured
- Status: Completed, report November 24, 1989
- Report: Approved by Office Director
- NTSB case key (mKey): 26289
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=LAX89LA039
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/26289/pdf
- Page: https://openairdocs.org/ntsb/LAX89LA039

## Sequence of events

In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf).

- Loss of control - in flight, takeoff - initial climb
  - weather condition - high wind (contributing factor)
  - weather condition - crosswind (contributing factor)
  - weather condition - gusts (contributing factor)
  - compensation for wind conditions - inadequate, pilot in command(cfi) (cause)
  - weather evaluation - inadequate, pilot in command(cfi) (contributing factor)
  - weather condition - high density altitude (contributing factor)
- In flight collision with terrain/water, descent - uncontrolled
  - terrain condition - soft (contributing factor)
- Nose down, landing

## Analysis

THE STUDENT PLT AND THE CFI AGREED THAT THE ACFT DEVELOPED A HIGH SINK RATE AS IT PASSED OVER THE DEPARTURE END OF THE DIRT RWY. THE ACFT COLLIDED WITH THE GROUND ABOUT 3/4 MILE FROM THE RWYS END. THE WINDS WERE VARIABLE BUT BASICALLY FROM THE SOUTH AT 15-20 KTS. THE DA WAS 4500 FT. A GROUND WITNESSES THOUGHT HE HEARD THE ENG SPUTTER AT THE RWYS END. THE CFI SAID THAT BECAUSE OF THE LACK OF CLIMB HE CHECKED THAT THE THROTTLE WAS FULLY OPEN AND THEN LOOKED BACK OUTSIDE. HE SAID THAT THE STUDENT DID ALL THAT HE THOUGHT COULD BE DONE SO HE DID NOT INTERFERE IN CONTROLLING THE ACFT. NO MALFUNCTIONS WERE REPORTED BY THE PLTS.

## Aircraft

- Registration: [N94TB](https://openairdocs.org/deregistered/N94TB-1991-04-05), registration cancelled 1991-04-05, S/N 542 (OpenAirDocs)
- Reported make and model: AEROSPATIALE TB-20
- Registry model: [Socata TB-20 TRINIDAD](https://openairdocs.org/model/socata-tb-20-trinidad) (registry code 8680695) (OpenAirDocs)
- Category: Airplane
- Serial number: 542
- Airframe hours: 713
- Engines: LYCOMING I0-540-C4D5D 250 horsepower reciprocating
- Damage: Substantial damage
- Flight: Instructional, Part 91
- Registered owner: Anthony Korba
- Airworthiness certificate: Standard, Normal
- Last inspection: Annual, August 18, 1988, 55 hours before
- Destination: SNA, SANTA ANA, CA
- Airport: Dirt Strip, runway 27, 1,500 ×  ft, dirt

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 36; airline transport; airplane ratings: multi-engine land, single-engine land; instrument ratings: airplane; medical: class 1, valid medical--w/ waivers/lim; seat: right; flight hours: 2,380 total, 80 in this make and model, 2,380 as pilot in command, 244 in the last 90 days, 76 in the last 30 days

## Weather

- Conditions: Visual (VMC), Day
- Wind: variable at 15 knots, gusting 30
- Visibility: 50 statute miles
- Lowest ceiling: none
- Temperature: 81 °F

## FAA reports on this event (1)

The FAA's own accident and incident reports, matched to the aircraft by N-number and date (OpenAirDocs).

- [Accident 19881105059639A](https://openairdocs.org/incident/19881105059639A), Nov 5, 1988: Socata TB20TRINIDAD, Yucca Valley, CA, Substantial damage. High sink rate after leaving end of runway continued to impact. Crosswind too much for safety. Blamed windshear.

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.

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