# NTSB ANC92LA004: Cessna 170B, N4606C, Chugiak, AK, October 11, 1991

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Limited investigation · Final report
- Date: October 10, 1991, 18:00 local (Oct 11, 1991, 02:00 UTC)
- Place: Chugiak, AK
- Coordinates: 61.409084, -149.170059 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=61.4091&lon=-149.1701&mi=10
- Phase of flight: [Takeoff](https://openairdocs.org/ntsb-phases/300) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 1 uninjured
- Status: Completed, report March 31, 1993
- Report: Approved by Office Director
- NTSB office: Alaska Regional Office
- NTSB case key (mKey): 5663
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=ANC92LA004
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/5663/pdf
- Page: https://openairdocs.org/ntsb/ANC92LA004

## Probable cause

THE STUDENT PILOT'S FAILURE TO MAINTAIN DIRECTIONAL CONTROL DURING THE TAKEOFF RUN.

## Sequence of events

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

- Nose over, takeoff - aborted
  - directional control - not maintained, pilot in command (cause)

## Analysis

THE STUDENT PILOT WAS PRACTICING SOLO TAKEOFF AND LANDINGS WITH THE INSTRUCTOR SUPERVISING FROM THE RAMP.  AFTER A NUMBER OF TAKEOFF AND LANDINGS, THE STUDENT PILOT TAXIED TO THE INSTRUCTOR'S LOCATION AND THE INSTRUCTOR THEN TOLD HIM TO CONTINUE PRACTICING.  THE STUDENT PILOT TAXIED TO THE RUNWAY AND BEGAN HIS TAKEOFF ROLL.  THE AIRPLANE BECAME AIRBORNE AFTER ONLY A PARTIAL POWER APPLICATION BY THE PILOT AND BEGAN TO VEER TO THE LEFT AND HE APPLIED RIGHT RUDDER.  HE STATED THE AIRPLANE DID NOT RESPOND AND HE ABORTED THE TAKEOFF BY REDUCING THE THROTTLE.  HE STATED HE FAILED TO REMOVE THE RIGHT RUDDER AND THE AIRPLANE IMMEDIATELY MADE A SHARP RIGHT TURN.  THE LEFT WING STRUCK THE RUNWAY AND THE AIRPLANE NOSED OVER.

## Aircraft

- Registration: [N4606C](https://openairdocs.org/deregistered/N4606C-2018-12-04), registration cancelled 2018-12-04, S/N 25550 (OpenAirDocs)
- Reported make and model: CESSNA 170B
- Registry model: [Cessna 170B](https://openairdocs.org/model/cessna-170b) (registry code 2072306) (OpenAirDocs)
- Registry engine: [Continental C145 series](https://openairdocs.org/engine/continental-c145-series) (registry code 17012, reciprocating) (OpenAirDocs)
- Category: Airplane
- Serial number: 25550
- Engines: LYCOMING O-340-A1A 170 horsepower reciprocating
- Damage: Substantial damage
- Flight: Instructional, Part 91
- Operator: Fitzgibbon, Paul Gratton
- Registered owner: Bingman, Lester
- Airworthiness certificate: Standard, Normal
- Last inspection: Annual, October 5, 1990, 78 hours before
- Departed: Z15
- Airport: Z15, Birchwood, runway 1, 4,000 × 150 ft, asphalt

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 24; student; airplane ratings: single-engine land; medical: class 3, valid medical--no waivers/lim.; seat: left; flight hours: 38 total, 38 in this make and model, 8 as pilot in command, 38 in the last 90 days, 38 in the last 30 days, 2 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Wind: calm
- Visibility: 30 statute miles
- Lowest ceiling: none
- Temperature: 39 °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 19911010045599A](https://openairdocs.org/incident/19911010045599A), Oct 10, 1991: Cessna 170B, Birchwood, AK, Substantial damage. Became airborne unexpected veered due torque. Aborted hit runway crabbed due full right rudder. Nosed over.

## Other investigations on N4606C (3)

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 ANC05LA076](https://openairdocs.org/ntsb/ANC05LA076), May 14, 2005: Cessna 170B (N4606C), Dillingham, AK, substantial damage. Probable cause: The pilot's inadequate compensation for wind conditions, which resulted in a loss of control during the landing roll. Factors associated with the accident are a crosswind, and an inadvertent ground…
- [NTSB ANC76AA045](https://openairdocs.org/ntsb/ANC76AA045), Sep 28, 1975: Cessna 170 (N4606C), Bethel, AK, substantial damage
- [NTSB ANC73DAG69](https://openairdocs.org/ntsb/ANC73DAG69), Dec 10, 1972: Cessna 170B (N4606C), Bethel, AK, substantial damage

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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