# NTSB FTW86FPJ09: Quick Silver Mxii, N4410W, Ardmore, OK, June 20, 1986

- Type: NTSB accident investigation
- Classification: Accident · Serious injuries · Final report
- Date: June 20, 1986, 12:30 local (17:30 UTC)
- Place: Ardmore, OK
- Coordinates: 34.189292, -97.109695 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=34.1893&lon=-97.1097&mi=10
- Phase of flight: [Approach](https://openairdocs.org/ntsb-phases/500) (OpenAirDocs' grouping)
- Highest injury: Serious injuries
- Injuries: 2 serious
- Status: Completed
- Report: Approved by Office Director
- NTSB case key (mKey): 21940
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=FTW86FPJ09
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/21940/pdf
- Page: https://openairdocs.org/ntsb/FTW86FPJ09

## Sequence of events

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

- Loss of engine power(partial) - mech failure/malf, approach - vfr pattern - base leg/base to final
  - engine assembly,bearing - failure,total (cause)
- Forced landing, descent - emergency
- In flight collision with object, landing - flare/touchdown
  - object - tree(s)

## Analysis

THE ACFT LANDED SHORT OF THE RWY AFTER LOSING ENG PWR DURING THE APCH. POST ACC INSPECTION SHOWED THAT THE BEARING ON THE PWR SHAFT FAILED. THIS ALLOWED THE BELT TENSION TO BECOME SLACK WHICH REDUCED THE PROP RPM. NO OTHER DISCREPANCIES WERE NOTED.

## Aircraft

- Registration: N4410W (not matched to a registry record)
- Reported make and model: QUICK SILVER MXII
- Category: Airplane, amateur-built
- Serial number: 1455
- Engines: ROTAX 503 48 horsepower reciprocating
- Damage: Substantial damage
- Flight: Personal, Part 91
- Registered owner: Glenn G. Smith
- Airworthiness certificate: Special, Experimental (Special)
- Last inspection: Annual, August 15, 1985, 60 hours before
- Airport: runway 20, 1,800 × 11 ft

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 28; private; airplane ratings: single-engine land; medical: class 2, valid medical--w/ waivers/lim; seat: left; flight hours: 503 total, 115 in this make and model, 464 as pilot in command, 25 in the last 90 days, 10 in the last 30 days

## Weather

- Conditions: Visual (VMC), Day
- Wind: calm
- Lowest ceiling: none
- Temperature: 84 °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 19860620026949A](https://openairdocs.org/incident/19860620026949A), Jun 20, 1986: Amtr QUICKSILVER, Ardmore, OK, Substantial damage. Power loss, hit tree, ground on forced landing. Power shaft bearing worn,failed. Slackened belt to propeller drive.

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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