# NTSB SEA93LA067: Beech C-99, N63978, Seattle, WA, February 25, 1993

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Limited investigation · Final report
- Date: February 24, 1993, 16:48 local (Feb 25, 1993, 00:48 UTC)
- Place: Seattle, WA
- Coordinates: 47.539512, -122.309783 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=47.5395&lon=-122.3098&mi=10
- Phase of flight: [Standing](https://openairdocs.org/ntsb-phases/150) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 2 uninjured
- Status: Completed, report October 13, 1993
- Report: Approved by Office Director
- NTSB case key (mKey): 42990
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=SEA93LA067
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/42990/pdf
- Page: https://openairdocs.org/ntsb/SEA93LA067

## Probable cause

THE IMPROPER STARTING PROCEDURE BY THE PILOT OF THE AERONCA. A FACTOR CONTRIBUTING TO THE ACCIDENT WAS INADEQUATE COMMUNICATIONS BY THE PILOT OF THE AERONCA.

## Sequence of events

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

- On ground/water collision with object, standing - engine(s) operating
  - starting procedure - improper, pilot of other aircraft (cause)
  - communications - inadequate, pilot of other aircraft (contributing factor)

## Analysis

THE PILOT, HAVING JUST LANDED HIS AERONCA ON RUNWAY 31L, EXITED AT THE FIRST TAXIWAY AND WAS CLEARED BY GROUND CONTROL TO HIS DESTINATION ON THE AIRPORT. NO REQUEST BY THE AERONCA PILOT WAS MADE AS HE APPROACHED AND PASSED BEHIND THE BEECH C-99 WHICH WAS EXECUTING A RUNUP AT A HOLD SHORT. AS THE AERONCA PASSED BEHIND THE BEECH IT SPUN AROUND AND ITS ENGINE QUIT. THE PILOT OF THE AERONCA THEN RADIOED GROUND CONTROL THAT HE HAD BEEN SPUN AROUND AND GROUND CONTROL REQUESTED THE BEECH TO 'COME TO IDLE' WHICH WAS ACKNOWLEDGED. THE PILOT OF THE AERONCA THEN EXITED HIS AIRCRAFT TO HAND PROP THE ENGINE. ONCE THE ENGINE STARTED, THE AIRCRAFT BEGAN TAXIING WITHOUT ANY OCCUPANTS AS THE PILOT HAD LEFT THE THROTTLE IN A POSITION GREATER THAN IDLE. THE AERONCA SUBSEQUENTLY IMPACTED THE RIGHT REAR QUARTER OF THE BEECH.

## Aircraft

- Registration: [N63978](https://openairdocs.org/aircraft/N63978), registered now, S/N U-171, built 1981 (OpenAirDocs)
- Reported make and model: BEECH C-99
- Registry model: [Beech C-99](https://openairdocs.org/model/beech-c-99) (registry code 1154006) (OpenAirDocs)
- Registry engine: [Pratt & Whitney Canada PT6A-60A](https://openairdocs.org/engine/pratt-whitney-canada-pt6a-60a) (registry code 52043, turbo-prop) (OpenAirDocs)
- Category: Airplane
- Serial number: U-171
- Engines: P&W PT6A-36 715 horsepower turbo prop
- Damage: Substantial damage
- Flight: Positioning, Part 91
- Operator: Ameriflight, Inc.
- Registered owner: Precision Aircraft Lease, Inc.
- Airworthiness certificate: Standard, Normal
- Last inspection: AAIP, January 2, 2000
- Destination: 75S, BURLINGTON, WA
- Flight plan: VFR
- Airport: BFI, Boeing Field

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 28; airline transport; airplane ratings: single-engine land, multi-engine land; instrument ratings: airplane; medical: class 2, valid medical--no waivers/lim.; seat: left; flight hours: 3,830 total, 265 in this make and model, 3,730 as pilot in command, 200 in the last 90 days, 70 in the last 30 days

## Weather

- Conditions: Visual (VMC), Day
- Wind: 340° at 4 knots
- Visibility: 50 statute miles
- Lowest ceiling: none
- Temperature: 43 °F, dew point 18 °F
- Altimeter: 30.00 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 19930224005322A](https://openairdocs.org/incident/19930224005322A), Feb 24, 1993: Beech C99, Seattle, WA, Substantial damage. During holding and run up advised cut power due N9279E in wake. Aeronca engine quit. Pilot propped it. Hit Beech.

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.

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.