# NTSB SEA91LA096: Cessna 150J, N50488, Mulino, OR, May 1, 1991

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Limited investigation · Final report
- Date: May 1, 1991, 16:00 local (23:00 UTC)
- Place: Mulino, OR
- Coordinates: 45.199386, -122.540679 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=45.1994&lon=-122.5407&mi=10
- Phase of flight: [Takeoff](https://openairdocs.org/ntsb-phases/300) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 1 uninjured
- Status: Completed, report February 8, 1993
- Report: Approved by Office Director
- NTSB case key (mKey): 41421
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=SEA91LA096
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/41421/pdf
- Page: https://openairdocs.org/ntsb/SEA91LA096

## Probable cause

THE PILOT'S INADEQUATE REMEDIAL ACTION.  FACTORS INCLUDE NOSE-GEAR VIBRATION.

## Sequence of events

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

- Loss of control - on ground/water, takeoff
  - touch-and-go
  - landing gear,nose gear - vibration (contributing factor)
  - remedial action - not performed, pilot in command (cause)
- In flight collision with terrain/water, takeoff

## Analysis

THE STUDENT PILOT ENCOUTERED NOSEWHEEL SHIMMY DURING TAKEOFF WHILE DOING TOUCH-AND-GO LANDINGS.  HE LOST CONTROL OF THE AIRCRAFT BEFORE IT LIFTED OFF.  THE AIRCRAFT LEFT THE SURFACE AND COLLIDED WITH THE TERRAIN ON THE LEFT SIDE OF THE RUNWAY, SUSTAINING SUBSTANTIAL DAMAGE.

## Aircraft

- Registration: [N50488](https://openairdocs.org/aircraft/N50488), registered now, S/N 15069340, built 1968 (OpenAirDocs)
- Reported make and model: CESSNA 150J
- Registry model: [Cessna 150J](https://openairdocs.org/model/cessna-150j) (registry code 2071820) (OpenAirDocs)
- Registry engine: [Continental 0-200 series](https://openairdocs.org/engine/continental-0-200-series) (registry code 17020, reciprocating) (OpenAirDocs)
- Category: Airplane
- Serial number: 15069340
- Engines: CONTINENTAL O-200-A 100 horsepower reciprocating
- Damage: Substantial damage
- Flight: Instructional, Part 91
- Operator: Mulino Air Center
- Registered owner: Mulino Air Center
- Airport: 4S9, Portland Mulino, runway 32, 3,600 × 150 ft, asphalt

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 48; student; medical: class 3, valid medical--w/ waivers/lim; flight hours: 33 total, 33 in this make and model, 33 as pilot in command, 16 in the last 90 days, 15 in the last 30 days, 1 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Wind: 340° at 8 knots, gusting 10
- Visibility: 10 statute miles
- Temperature: -0 °F, dew point -0 °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 19910501014189A](https://openairdocs.org/incident/19910501014189A), May 1, 1991: Cessna 150J, Mulino, OR, Substantial damage. Porpoised on touch and go. Drifted off runway,airborne between bounces. Landed in mud collapsing nose gear.

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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