# NTSB ANC84LA162: Piper PA-18-150, N9474D, Rohn River, AK, September 1, 1984

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Limited investigation · Final report
- Date: September 1, 1984, 07:30 local (15:30 UTC)
- Place: Rohn River, AK
- Phase of flight: [Takeoff](https://openairdocs.org/ntsb-phases/300) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 2 uninjured
- Status: Completed
- Report: Approved by Office Director
- NTSB office: Alaska Regional Office
- NTSB case key (mKey): 4360
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=ANC84LA162
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/4360/pdf
- Page: https://openairdocs.org/ntsb/ANC84LA162

## Sequence of events

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

- Loss of control - on ground/water, takeoff - roll/run
  - weather condition - high density altitude (contributing factor)
  - aircraft weight and balance - not performed, pilot in command (cause)
  - performance data - not understood, pilot in command (cause)
  - performance data - disregarded, pilot in command (cause)
  - directional control - not maintained, pilot in command (cause)
  - ground loop/swerve - uncontrolled, pilot in command (cause)

## Analysis

THE ACFT WOULD NOT LIFT OFF IN THE DISTANCE THE PLT THOUGHT.THE DENSITY ALT WAS NEAR 1500 FT AND THE PLT HAD 130 LBS IN THE REAR SEAT AND BAGGAGE AREA. THE PLT SAID THAT THE ACFT BOUNCED DURING THE ROLL AND THEN GROUND LOOPED.

## Aircraft

- Registration: [N9474D](https://openairdocs.org/deregistered/N9474D-2013-04-15), registration cancelled 2013-04-15, S/N 18-6819, built 1959 (OpenAirDocs)
- Reported make and model: PIPER PA-18-150
- Registry model: [Piper PA-18-150](https://openairdocs.org/model/piper-pa-18-150) (registry code 7101828) (OpenAirDocs)
- Registry engine: [Lycoming 0-320 series](https://openairdocs.org/engine/lycoming-0-320-series) (registry code 41508, reciprocating) (OpenAirDocs)
- Category: Airplane
- Serial number: 186819
- Airframe hours: 1633
- Engines: LYCOMING O-320 150 horsepower reciprocating
- Damage: Substantial damage
- Flight: Personal, Part 91
- Registered owner: Len O. Hannaman
- Airworthiness certificate: Standard, Normal
- Last inspection: Annual, July 15, 1984

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 36; private; airplane ratings: single-engine land; medical: class 3, valid medical--w/ waivers/lim; seat: front; flight hours: 270 total, 130 in this make and model, 100 in the last 90 days, 10 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Wind: calm
- Visibility: 50 statute miles
- Lowest ceiling: none
- Temperature: 39 °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 19840901050639A](https://openairdocs.org/incident/19840901050639A), Sep 1, 1984: Piper PA18150, Farewell, AK, Substantial damage. Struck a bump on takeoff from a emergency airstrip, lost control and aircraft ground looped. Density altitude factor

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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