# NTSB LAX89DVG02: Knowles Thorp T-18, N77KK, Lincoln, CA, December 4, 1988

- Type: NTSB accident investigation
- Classification: Accident · Minor injuries · Final report
- Date: December 4, 1988, 14:22 local (22:22 UTC)
- Place: Lincoln, CA
- Coordinates: 38.929317, -121.249481 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=38.9293&lon=-121.2495&mi=10
- Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping)
- Highest injury: Minor injuries
- Injuries: 1 minor
- Status: Completed, report December 29, 1989
- Report: Approved by Office Director
- NTSB case key (mKey): 26164
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=LAX89DVG02
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/26164/pdf
- Page: https://openairdocs.org/ntsb/LAX89DVG02

## Sequence of events

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

- On ground/water encounter with terrain/water, landing - roll
  - directional control - not maintained, pilot in command (cause)
- Nose over, landing - roll

## Analysis

THE PILOT STATED THAT HE WAS PRACTICING TAKEOFFS AND LANDINGS ON A LOCAL FLIGHT. DURING ONE OF THOSE LANDINGS HE INDICATED THAT THE RIGHT WHEEL LOCKED UP AND CAUSED THE AIRCRAFT TO VEER TO THE RIGHT. HE STATED THAT HE SUBSEQUENTLY LOST CONTROL OF THE AIRCRAFT AND IT RAN OFF THE RIGHT SIDE OF THE RUNWAY AND NOSED OVER. EXAMINATION OF THE BRAKING SYSTEM ON THE AIRCRAFT DID NOT REVEAL ANY EVIDENCE OF MECHANICAL MALFUNCTION.

## Aircraft

- Registration: [N77KK](https://openairdocs.org/deregistered/N77KK-1998-07-16), registration cancelled 1998-07-16, S/N 492 (OpenAirDocs)
- Reported make and model: KNOWLES THORP T-18
- Registry model: [Knowles THORP T-18](https://openairdocs.org/model/knowles-thorp-t-18) (registry code 89510BQ) (OpenAirDocs)
- Category: Airplane, amateur-built
- Serial number: 492
- Airframe hours: 1059
- Engines: LYCOMING O-290D 135 horsepower reciprocating
- Damage: Substantial damage
- Flight: Personal, Part 91
- Operator: Justus, Norman Charles
- Registered owner: Justus, Norman Charies
- Airworthiness certificate: Special, Experimental (Special)
- Last inspection: Annual, March 11, 1988, 49 hours before
- Departed: Q94, RIO LINDA, CA
- Airport: 051, Lincoln Muni, runway 15, 6,001 × 100 ft, asphalt

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 71; commercial; airplane ratings: single-engine land, multi-engine land; medical: class 3, valid medical--w/ waivers/lim; seat: left; flight hours: 1,175 total, 400 in this make and model, 22 in the last 90 days, 3 in the last 30 days, 1 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Wind: 230° at 3 knots
- Visibility: 10 statute miles
- Lowest ceiling: none
- Temperature: 63 °F, dew point 43 °F
- Altimeter: 30.00 inHg
- Observed at: MCC

## 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 19881204052539A](https://openairdocs.org/incident/19881204052539A), Dec 4, 1988: Amtrth THORPT18, Lincoln, CA, Substantial damage. Veered off runway on landing and nosed over. Blamed locked brake. None found.

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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