# NTSB ANC90LA163: Cessna 150-L, N17008, Anchorage, AK, September 2, 1990

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Limited investigation · Final report
- Date: September 1, 1990, 17:45 local (Sep 2, 1990, 01:45 UTC)
- Place: Anchorage, AK
- Coordinates: 61.220603, -149.850708 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=61.2206&lon=-149.8507&mi=10
- Phase of flight: [Maneuvering](https://openairdocs.org/ntsb-phases/450) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 2 uninjured
- Status: Completed, report September 15, 1992
- Report: Approved by Office Director
- NTSB office: Alaska Regional Office
- NTSB case key (mKey): 5444
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=ANC90LA163
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/5444/pdf
- Page: https://openairdocs.org/ntsb/ANC90LA163

## Probable cause

THE PILOT-INN-COMMAND'S FAILURE TO MAINTAIN FLYING SPEED. CONTRIBUTING TO THE ACCIDENT WAS IMPROPER ALTITUDE.

## Sequence of events

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

- Loss of control - in flight, maneuvering
  - terrain condition - high terrain (cause)
  - aircraft control - not maintained, pilot in command (cause)
  - weather condition - downdraft (contributing factor)
  - proper altitude - not attained, pilot in command (cause)
  - weather condition - high wind (contributing factor)
- In flight collision with terrain/water, maneuvering

## Analysis

THE PILOT STATED THAT HE WAS FLYING PARALLEL TO A RIDGE LINE WHEN HE ENCOUNTERED A SEVERE DOWNDRAFT. THE AIRPLANE THEN CRASHED ON THE RIDGE.

## Aircraft

- Registration: N17008 (not matched to a registry record)
- Reported make and model: CESSNA 150-L
- Category: Airplane
- Serial number: 15073577
- Airframe hours: 7063
- Engines: CONTINENTAL O-200A 100 horsepower reciprocating
- Damage: Substantial damage
- Flight: Personal, Part 91
- Registered owner: H & H Air Service
- Airworthiness certificate: Standard, Normal
- Last inspection: 100 hour, August 29, 1990, 3 hours before
- Flight plan: Company VFR

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 29; flight instructor, commercial; airplane ratings: single-engine land, single-engine sea; instrument ratings: airplane; medical: class 2, valid medical--no waivers/lim.; seat: left; flight hours: 545 total, 53 in this make and model, 496 as pilot in command, 284 in the last 90 days, 149 in the last 30 days, 4 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Wind: 320° at 11 knots, gusting 15
- Visibility: 40 statute miles
- Lowest ceiling: none
- Temperature: 55 °F, dew point 41 °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 19900901037679A](https://openairdocs.org/incident/19900901037679A), Sep 1, 1990: Cessna 150L, Anchorage, AK, Substantial damage. Flying below a ridge encountered downdraft. Unable to recover, contacted a slope and nosed over. Blamed windshear.

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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