# NTSB CHI90LA017: De Havilland DH82A, N100MH, Mascoutah, IL, October 22, 1989

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Limited investigation · Final report
- Date: October 22, 1989, 15:53 local (20:53 UTC)
- Place: Mascoutah, IL
- Location: 38.5181° N, 89.8000° W: Placed by OpenAirDocs: center of Mascoutah, IL, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=38.5181&lon=-89.8000&mi=10
- Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 2 uninjured
- Status: Completed, report July 9, 1990
- Report: Approved by Office Director
- NTSB case key (mKey): 14584
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CHI90LA017
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/14584/pdf
- Page: https://openairdocs.org/ntsb/CHI90LA017

## Probable cause

AN UNDETERMINED POWERPLANT PROBLEM, WHICH RESULTED IN A SEVERE VIBRATION.  THE SOFT/UNEVEN TERRAIN WAS CONSIDERED TO BE A CONTRIBUTING FACTOR.

## Sequence of events

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

- Airframe/component/system failure/malfunction, cruise - normal
  - powerplant - undetermined (cause)
  - powerplant - vibration
- Forced landing, descent - emergency
- Nose over, landing - roll
  - terrain condition - soft (contributing factor)
  - terrain condition - rough/uneven (contributing factor)

## Aircraft

- Registration: [N100MH](https://openairdocs.org/aircraft/N100MH), registered now, S/N A17-122 (OpenAirDocs)
- Reported make and model: DE HAVILLAND DH82A
- Registry model: [Dehavilland TIGER MOTH DH 82A](https://openairdocs.org/model/dehavilland-tiger-moth-dh-82a) (registry code 2801002) (OpenAirDocs)
- Registry engine: [Rolls-Royce GIPSY MK series](https://openairdocs.org/engine/rolls-royce-gipsy-mk-series) (registry code 54560, reciprocating) (OpenAirDocs)
- Category: Airplane
- Serial number: A17-122
- Engines: Rolls-Royce GIPSY MAJOR 130 horsepower reciprocating
- Damage: Substantial damage
- Flight: Personal, Part 91
- Registered owner: Roland A. Shepard
- Airworthiness certificate: Standard, Utility; Standard, Normal
- Last inspection: Annual, July 18, 1989, 15 hours before
- Departed: MO49, WASHINGTON, MO
- Destination: CULL, CARMI, IL

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 64; airline transport; airplane ratings: multi-engine land, single-engine land; instrument ratings: airplane; medical: class 2, valid medical--w/ waivers/lim; seat: rear; flight hours: 24,000 total, 40 in this make and model, 20,000 as pilot in command, 10 in the last 90 days, 6 in the last 30 days, 6 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Wind: 150° at 10 knots
- Visibility: 7 statute miles
- Lowest ceiling: 25,000 ft broken
- Temperature: 70 °F, dew point 54 °F
- Altimeter: 30.00 inHg
- Observed at: BLV, 4 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 19891022041969A](https://openairdocs.org/incident/19891022041969A), Oct 22, 1989: Dhavxx DH82AROBRTSN, Mascoutah, IL, Substantial damage. Engine lost partial power. Nosed over in soft field landing . Unable to pinpoint cause but NR4 cylinder weak.

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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