# NTSB MIA87LA199: Let L-13, N99946, Plymouth, FL, May 31, 1987

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Limited investigation · Final report
- Date: May 31, 1987, 13:05 local (17:05 UTC)
- Place: Plymouth, FL
- Location: 28.7066° N, 81.5814° W: Placed by OpenAirDocs at ORLANDO APOPKA (X04), within about a mile (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=28.7066&lon=-81.5814&mi=10
- Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 1 uninjured
- Status: Completed, report May 9, 1988
- Report: Approved by Office Director
- NTSB case key (mKey): 31937
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=MIA87LA199
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/31937/pdf
- Page: https://openairdocs.org/ntsb/MIA87LA199

## Sequence of events

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

- Hard landing, landing - flare/touchdown
  - altimeter - misread, pilot in command (cause)
  - flare - misjudged, pilot in command (cause)
  - lack of total experience in type of aircraft, pilot in command (contributing factor)

## Analysis

THE PLT MISREAD THE ALTIMETER BY 1000 FT WHEN THE FLT ENTERED THE INITIAL POINT OF THE TRAFFIC PATTERN. HE THEN BEGAN CIRCLING TO DISSIPATE ALT & REALIZED THAT THE ACFT WAS LOW. HE THEN PROCEEDED DOWNWIND, TURNED BASE THEN FINAL & LANDED HARD BUCKLING THE WINGS & FUSELAGE.

## Aircraft

- Registration: [N99946](https://openairdocs.org/deregistered/N99946-2018-04-06), registration cancelled 2018-04-06, S/N 025822 (OpenAirDocs)
- Reported make and model: LET L-13
- Registry model: [Let BLANIK L-13](https://openairdocs.org/model/let-blanik-l-13) (registry code 1360306) (OpenAirDocs)
- Category: Glider
- Serial number: 025822
- Airframe hours: 2282
- Engines: NONE NONE unknown
- Damage: Substantial damage
- Flight: Personal, Part 91
- Registered owner: Tnple Niner Soaring Inc.
- Airworthiness certificate: Standard, Normal
- Last inspection: 100 hour, April 28, 1987, 25 hours before
- Airport: X04, Orlando North, runway 15, 3,000 × 30 ft, asphalt

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 58; private; airplane ratings: single-engine land; seat: front; flight hours: 164 total, 6 in this make and model, 5 in the last 90 days

## Weather

- Conditions: Visual (VMC), Day
- Wind: 80° at 9 knots
- Visibility: 15 statute miles
- Lowest ceiling: none
- Temperature: 88 °F, dew point 66 °F
- Altimeter: 30.00 inHg
- Observed at: MCO, 22 nm away

## 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 19870531034979A](https://openairdocs.org/incident/19870531034979A), May 31, 1987: Let L13BLANIK, Plymouth, FL, Substantial damage. Misjudged altitude on final stretched glide and landed hard on the runway.

## Other investigations on N99946 (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 MIA92LA122](https://openairdocs.org/ntsb/MIA92LA122), May 4, 1992: Let L-13 (N99946), Boynton Beach, FL, substantial damage. Probable cause: PREMATURE EXTENSION OF THE SPOILERS BY THE PILOT DURING APPROACH TO LAND. CONTRIBUTING TO THE ACCIDENT WAS HIS LACK OF TOTAL EXPERIENCE IN THE TYPE OF AIRCRAFT AND IN-FLIGHT ENCOUNTER WITH A…

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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