# NTSB ANC89LA104: Interstate S-1A, N37209, Iliamna, AK, June 27, 1989

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Limited investigation · Final report
- Date: June 27, 1989, 15:00 local (23:00 UTC)
- Place: Iliamna, AK
- Coordinates: 59.850101, -154.559585 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=59.8501&lon=-154.5596&mi=10
- Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 1 uninjured
- Status: Completed, report March 29, 1991
- Report: Approved by Office Director
- NTSB office: Alaska Regional Office
- NTSB case key (mKey): 5207
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=ANC89LA104
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/5207/pdf
- Page: https://openairdocs.org/ntsb/ANC89LA104

## Probable cause

PILOT FAILED TO MAINTAIN DIRECTIONAL CONTROL DURING THE ATTEMPTED GO-AROUND. FACTORS IN THE ACCIDENT WERE THE ROUGH/UNEVEN TERRAIN AND THE BRUSH BESIDE THE RUNWAY.

## Sequence of events

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

- In flight collision with terrain/water, landing - aborted
  - terrain condition - rough/uneven (contributing factor)
- Loss of control - in flight, landing - aborted
  - terrain condition - high vegetation (contributing factor)
  - recovery from bounced landing - improper, pilot in command (cause)
- Nose over, landing - aborted

## Analysis

THE PILOT STATED THAT HE HIT A BUMP IN THE RUNWAY, CAUSING THE AIRPLANE TO BOUNCE DURING LANDING. HE THEN ATTEMPTED TO MAKE A GO-AROUND. THE RIGHT WING HIT SOME SCRUB BRUSH ALONG THE SIDE OF THE RUNWAY, CAUSING THE PILOT TO LOSE CONTROL OF THE AIRPLANE AND NOSE OVER.

## Aircraft

- Registration: [N37209](https://openairdocs.org/deregistered/N37209-2014-11-26), registration cancelled 2014-11-26, S/N 52, built 1942 (OpenAirDocs)
- Reported make and model: INTERSTATE S-1A
- Registry model: [Interstate S-1A](https://openairdocs.org/model/interstate-s-1a) (registry code 1850202) (OpenAirDocs)
- Registry engine: [Lycoming 0-290 series](https://openairdocs.org/engine/lycoming-0-290-series) (registry code 41506, 4 cycle) (OpenAirDocs)
- Category: Airplane
- Serial number: 52
- Airframe hours: 1574
- Engines: LYCOMING O-290-D 125 horsepower reciprocating
- Damage: Substantial damage
- Flight: Personal, Part 91
- Operator: Dugagan, Reuben V.
- Registered owner: Reuben V Dunagan
- Airworthiness certificate: Standard, Normal
- Last inspection: Annual, April 4, 1989, 30 hours before
- Airport: NONE, Iliaska, runway 18, 700 × 75 ft, grass/turf

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 43; commercial; airplane ratings: single-engine land, single-engine sea; instrument ratings: airplane; medical: valid medical--w/ waivers/lim; seat: left; flight hours: 2,521 total, 24 in this make and model, 2,461 as pilot in command, 46 in the last 90 days, 46 in the last 30 days, 1 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Wind: 160° at 10 knots
- Visibility: 50 statute miles
- Lowest ceiling: none
- Temperature: 59 °F, dew point 43 °F
- Altimeter: 29.00 inHg

## 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 19890627017709A](https://openairdocs.org/incident/19890627017709A), Jun 27, 1989: Arctic S1AARCTIC, Iliamna, AK, Substantial damage. Hit a bump on runway during a go around attempt causing a wing to hit brush. The aircraft nosed over.

## Other investigations on N37209 (1)

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.

- [NTSB ANC05LA073](https://openairdocs.org/ntsb/ANC05LA073), May 7, 2005: Interstate S-1A (N37209), Palmer, AK, substantial damage. Probable cause: The pilot's misjudged distance and speed, which resulted in an overrun during the landing roll, and subsequent nose over. Factors contributing to the accident were a tailwind and a short landing area.

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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