# NTSB SEA86LA029: Maule M-5-180C, N5635D, Idaho Falls, ID, December 7, 1985

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Limited investigation · Final report
- Date: December 7, 1985, 15:30 local (22:30 UTC)
- Place: Idaho Falls, ID
- Coordinates: 43.499877, -111.890892 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=43.4999&lon=-111.8909&mi=10
- Phase of flight: [Approach](https://openairdocs.org/ntsb-phases/500) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 1 uninjured
- Status: Completed
- Report: Approved by Office Director
- NTSB case key (mKey): 40338
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=SEA86LA029
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/40338/pdf
- Page: https://openairdocs.org/ntsb/SEA86LA029

## Sequence of events

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

- Loss of engine power(total) - nonmechanical, approach - faf/outer marker to threshold (ifr)
  - induction air control/system - ice (cause)
- Forced landing, descent - emergency
- Nose over, landing - flare/touchdown
  - terrain condition - snow covered (contributing factor)

## Analysis

A TOTAL LOSS OF POWER OCCURRED DURING AN ILS APPROACH DUE TO INDUCTION ICE. DURING TOUCHDOWN ON 12 INCHES OF SNOW A NOSE OVER OCCURRED.

## Aircraft

- Registration: [N5635D](https://openairdocs.org/aircraft/N5635D), registered now, S/N 8006C, built 1979 (OpenAirDocs)
- Reported make and model: MAULE M-5-180C
- Registry model: [Maule M-5-180C](https://openairdocs.org/model/maule-m-5-180c) (registry code 5460204) (OpenAirDocs)
- Registry engine: [Lycoming O&VO-360 series](https://openairdocs.org/engine/lycoming-o-vo-360-series) (registry code 41514, reciprocating) (OpenAirDocs)
- Category: Airplane
- Serial number: 8006C
- Airframe hours: 1350
- Engines: LYCOMING O-360-CIF 180 horsepower reciprocating
- Damage: Substantial damage
- Flight: Positioning, Part 91
- Registered owner: Richard Roth
- Airworthiness certificate: Standard, Normal
- Last inspection: 100 hour, September 1, 1985, 45 hours before
- Departed: BZM, BOZEMAN, MT
- Destination: TWF, TWIN FALLS, ID
- Flight plan: IFR
- Airport: IDA, Idaho Falls, runway 202, 8,997 × 150 ft, snow

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 40; commercial, airline transport, flight instructor; airplane ratings: single-engine land, multi-engine land; instrument ratings: airplane; medical: class 1, valid medical--w/ waivers/lim; seat: left; flight hours: 5,905 total, 121 in this make and model, 5,905 as pilot in command, 120 in the last 90 days, 4 in the last 24 hours

## Weather

- Conditions: Instrument (IMC), Day
- Wind: 10° at 6 knots
- Visibility: 2 statute miles
- Lowest ceiling: 1,000 ft overcast
- Temperature: 27 °F, dew point 25 °F
- Altimeter: 30.00 inHg
- Observed at: IDA, 5 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 19851207061149A](https://openairdocs.org/incident/19851207061149A), Dec 7, 1985: Maule M5180C, Idaho Falls, ID, Substantial damage. Engine ran rough and then quit on final. Landed in field. Ice in induction hose,air filter entirely covered in ice.

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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