# NTSB CHI84LA064: Cessna 421, N7557Q, Harbor Springs, MI, December 17, 1983

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Limited investigation · Final report
- Date: December 17, 1983, 17:15 local (22:15 UTC)
- Place: Harbor Springs, MI
- Coordinates: 45.43016, -84.980598 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=45.4302&lon=-84.9806&mi=10
- Phase of flight: [Takeoff](https://openairdocs.org/ntsb-phases/300) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 4 uninjured
- Status: Completed
- Report: Approved by Office Director
- NTSB case key (mKey): 12507
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CHI84LA064
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/12507/pdf
- Page: https://openairdocs.org/ntsb/CHI84LA064

## Sequence of events

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

- Loss of control - on ground/water, takeoff
  - aborted takeoff - performed, pilot in command (contributing factor)
  - directional control - not maintained, pilot in command (cause)
  - ground loop/swerve - inadvertent, pilot in command
  - airport facilities,runway/landing area condition - snow covered (contributing factor)
  - airport facilities,runway/landing area condition - icy (contributing factor)
- On ground/water encounter with terrain/water, takeoff
  - terrain condition - snowbank (contributing factor)

## Analysis

THE PLT STATED THAT AN OVERBOOST OCCURRED ON THE RIGHT ENG DURING THE TAKEOFF ROLL. HE PULLED OFF POWER ON BOTH ENGS BUT THE ACFT SLID OFF THE RWY INTO A SNOWBANK.

## Aircraft

- Registration: [N7557Q](https://openairdocs.org/aircraft/N7557Q), registered now, S/N 421B0345, built 1972 (OpenAirDocs)
- Reported make and model: CESSNA 421
- Registry model: [Cessna 421B](https://openairdocs.org/model/cessna-421b) (registry code 2076014) (OpenAirDocs)
- Registry engine: [Continental GTSI0-520-F-K](https://openairdocs.org/engine/continental-gtsi0-520-f-k) (registry code 17031, reciprocating) (OpenAirDocs)
- Category: Airplane
- Serial number: 421B0345
- Engines: CONTINENTAL GTSIO-520-H 375 horsepower reciprocating
- Damage: Substantial damage
- Flight: Personal, Part 91
- Registered owner: E.F. Soloman
- Airworthiness certificate: Standard, Normal
- Destination: LAN, LANSING, MI
- Flight plan: IFR
- Airport: D87, Harbor Springs, runway 28, 3,915 × 60 ft, asphalt

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 31; commercial; airplane ratings: single-engine land, multi-engine land; instrument ratings: airplane; medical: class 1, valid medical--no waivers/lim.

## Weather

- Conditions: Visual (VMC), Night/dark
- Wind: 330° at 8 knots
- Visibility: 3 statute miles
- Lowest ceiling: 2,500 ft overcast
- Temperature: 18 °F, dew point 14 °F
- Altimeter: 30.00 inHg
- Observed at: PLN, 11 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 19831217063059A](https://openairdocs.org/incident/19831217063059A), Dec 17, 1983: Cessna 421B, Harbor Springs, MI, Substantial damage. Pilot stated that during takeoff roll, an overboost occurred on right engine. Aircraft slid off runway into snow.

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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