# NTSB ANC91LA071: Piper PA-18, N8466Y, Anchorage, AK, June 9, 1991

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Limited investigation · Final report
- Date: June 8, 1991, 17:30 local (Jun 9, 1991, 01:30 UTC)
- Place: Anchorage, AK
- Coordinates: 61.220657, -149.849853 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=61.2207&lon=-149.8499&mi=10
- Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 2 uninjured
- Status: Completed, report May 5, 1993
- Report: Approved by Office Director
- NTSB office: Alaska Regional Office
- NTSB case key (mKey): 5555
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=ANC91LA071
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/5555/pdf
- Page: https://openairdocs.org/ntsb/ANC91LA071

## Probable cause

THE PILOT'S FAILURE TO MAINTAIN DIRECTIONAL CONTROL OF THE AIRPLANE DURING THE LANDING ROLL.  CONTRIBUTING TO THE ACCIDENT WAS THE CROSSWIND.

## Sequence of events

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

- Loss of control - on ground/water, landing - roll
  - weather condition - crosswind (contributing factor)
  - directional control - not maintained, pilot in command(cfi) (cause)
- On ground/water encounter with terrain/water, landing - roll
- Dragged wing,rotor,pod,float or tail/skid, landing - roll

## Analysis

THE PILOT STATED THAT AFTER TOUCHDOWN AND ROLLOUT ON THE RUNWAY, HE LOST DIRECTIONAL CONTROL OF THE AIRPLANE.  THE AIRPLANE THEN GROUND LOOPED TO THE LEFT.

## Aircraft

- Registration: N8466Y (not matched to a registry record)
- Reported make and model: PIPER PA-18
- Category: Airplane
- Serial number: 187309023
- Airframe hours: 1633
- Engines: LYCOMING O-320 160 horsepower reciprocating
- Damage: Substantial damage
- Flight: Instructional, Part 91
- Operator: John Berggren
- Registered owner: John Berggren
- Airworthiness certificate: Standard, Normal
- Last inspection: Annual, June 7, 1991, 3 hours before
- Airport: MRI, Merrill, runway 24, 3,992 × 100 ft, asphalt

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 44; commercial, flight instructor, private; airplane ratings: single-engine land, single-engine sea; instrument ratings: airplane; medical: class 2, valid medical--w/ waivers/lim; seat: rear; flight hours: 618 total, 26 in this make and model, 556 as pilot in command, 46 in the last 90 days, 18 in the last 30 days, 4 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Wind: 230° at 7 knots
- Visibility: 70 statute miles
- Lowest ceiling: none
- Temperature: 61 °F, dew point 50 °F
- Altimeter: 29.00 inHg
- Observed at: MRI, 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 19910608020789A](https://openairdocs.org/incident/19910608020789A), Jun 8, 1991: Piper PA18150, Anchorage, AK, Substantial damage. Student ground looped the tail wheel aircraft on landing. CFI failed to stop the runway incursion.

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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