# NTSB FTW90DPJ01: Zimmerman Moni Motorglider, N15JZ, Oklahoma City, OK, October 4, 1989

- Type: NTSB accident investigation
- Classification: Accident · Minor injuries · Final report
- Date: October 4, 1989, 17:10 local (22:10 UTC)
- Place: Oklahoma City, OK
- Location: 35.6018° N, 97.7062° W: Placed by OpenAirDocs at SUNDANCE (HSD), within about a mile (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=35.6018&lon=-97.7062&mi=10
- Phase of flight: [Approach](https://openairdocs.org/ntsb-phases/500) (OpenAirDocs' grouping)
- Highest injury: Minor injuries
- Injuries: 1 minor
- Status: Completed, report July 22, 1992
- Report: Approved by Office Director
- NTSB case key (mKey): 22950
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=FTW90DPJ01
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/22950/pdf
- Page: https://openairdocs.org/ntsb/FTW90DPJ01

## Probable cause

POWER LOSS DUE TO THE DETERIORATED MUFFLER BAFFLE WHICH WAS NOT DISCOVERED IN THE RECENT ANNUAL INSPECTION. A FACTOR WAS THE PILOT'S FAILURE TO PROPERLY ANALYZE AND CORRECT FOR THE HEADWIND.

## Sequence of events

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

- Loss of engine power(total) - mech failure/malf, approach - vfr pattern - final approach
  - exhaust system,muffler - deteriorated (cause)
  - maintenance,annual inspection - improper, other maintenance personnel (cause)
  - exhaust system,muffler - blocked(partial)
  - compensation for wind conditions - improper, pilot in command (contributing factor)
- Forced landing, descent - emergency
- In flight collision with terrain/water, landing - flare/touchdown

## Aircraft

- Registration: N15JZ (not matched to a registry record)
- Reported make and model: ZIMMERMAN MONI MOTORGLIDER (MONI MOTOR)
- Category: Airplane, amateur-built
- Serial number: 333T
- Airframe hours: 81
- Engines: KFM 107E MAXI 30 horsepower reciprocating
- Damage: Substantial damage
- Flight: Personal, Part 91
- Registered owner: Daniel R. Stroud
- Airworthiness certificate: Special, Experimental (Special)
- Last inspection: Annual, August 29, 1989, 8 hours before
- Departed: HSD, OKLAHOMA CITY, OK
- Airport: HSD, Sun Dance, runway 17, 5,000 × 50 ft, concrete

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 36; commercial; airplane ratings: single-engine land; instrument ratings: airplane; medical: class 2, valid medical--w/ waivers/lim; seat: center; flight hours: 2,041 total, 10 in this make and model, 1,873 as pilot in command, 34 in the last 90 days, 16 in the last 30 days

## Weather

- Conditions: Visual (VMC), Day
- Lowest ceiling: none

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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