# NTSB SEA93FA046: Aero Commander 680FL, N111MN, Lester, WA, December 26, 1992

- Type: NTSB accident investigation
- Classification: Accident · Fatal · Field investigation · Final report
- Date: December 25, 1992, 21:37 local (Dec 26, 1992, 05:37 UTC)
- Place: Lester, WA
- Coordinates: 47.339679, -121.919868 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=47.3397&lon=-121.9199&mi=10
- Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping)
- Highest injury: Fatal
- Injuries: 1 fatal
- Status: Completed, report December 16, 1993
- Report: Approved by Office Director
- NTSB case key (mKey): 42934
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=SEA93FA046
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/42934/pdf
- Page: https://openairdocs.org/ntsb/SEA93FA046

## Probable cause

UNDETERMINED.

## Sequence of events

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

- Loss of control - in flight, climb - to cruise
  - reason for occurrence undetermined (cause)
- In flight collision with terrain/water, descent - uncontrolled

## Analysis

AFTER DEPARTURE, THE AIRPLANE INTERCEPTED AIRWAY V-2, AND APPEARED TO CLIMB NORMALLY UNTIL REACHING 8300 FT (9000 ASSIGNED) WHILE TRACKING APRX 110 DEG MAG. RADAR ANALYSIS SHOWED THE AIRPLANE AT 128 KIAS WHEN IT ABRUPTLY TURNED LEFT 30 DEG AND THEN APPEARED TO RECOVER. VOICE COMMUNICATION DURING THIS EVENT WAS NORMAL WITH NO CHANGE IN THE PILOT'S LEVEL OF ANXIETY. IMMEDIATELY THEREAFTER, THE HEADING CHANGED OVER 90 DEG TO THE LEFT (NORTHBOUND), AND A MAXIMUM 6750 FPM RATE OF DESCENT DEVELOPED BEFORE THE HEADING STABILIZED AND THE DESCENT SLOWED. THE AIRPLANE'S GROUND IMPACT SITE WAS APRX 1 NM SW OF THE LAST RADAR TARGET. WRECKAGE DISTRIBUTION WAS ROUGHLY PARALLEL TO V-2. THE AIRPLANE IMPACTED THE MOUNTAINSIDE IN A STEEP NOSE LOW, LEFT WING DOWN ATTITUDE. THE ENGINES, PROPELLERS/GOVERNORS WERE DISASSEMBLED AND INSPECTED WITH NO EVIDENCE OF MECHANICAL MALFUNCTION. EXAM OF THE LEFT PROPELLER INDICATED LOW POWER ON IMPACT. THERE WAS NO EVIDENCE OF SIGNIFICANT ICING/TURBULENCE.

## Aircraft

- Registration: [N111MN](https://openairdocs.org/deregistered/N111MN-1993-06-08), registration cancelled 1993-06-08, S/N 1806150 (OpenAirDocs)
- Reported make and model: AERO COMMANDER 680FL
- Registry model: [Aero Commander 680FL](https://openairdocs.org/model/aero-commander-680fl) (registry code 0141608) (OpenAirDocs)
- Category: Airplane
- Serial number: 1806-150
- Airframe hours: 11219
- Engines: LYCOMING IO-720-B1B 400 horsepower reciprocating
- Damage: Destroyed
- Flight: Part 135
- Operator: Corporate Air
- Registered owner: Corporate Air
- Airworthiness certificate: Standard, Normal
- Last inspection: AAIP, December 1, 1992, 42 hours before
- Departed: SEA, SEATTLE, WA
- Destination: GEG, SPOKANE, WA
- Flight plan: IFR

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 36; airline transport, flight instructor; airplane ratings: multi-engine land, single-engine land; instrument ratings: airplane; medical: class 1, valid medical--no waivers/lim.; seat: left; toxicology performed; flight hours: 3,108 total, 138 in this make and model, 2,629 as pilot in command, 151 in the last 90 days, 62 in the last 30 days, 3 in the last 24 hours

## Weather

- Conditions: Night/dark
- Wind: 180° at 11 knots
- Visibility: 4 statute miles
- Lowest ceiling: 900 ft broken
- Temperature: 39 °F, dew point 37 °F
- Altimeter: 29.00 inHg
- Observed at: SEA, 35 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 19921225051609A](https://openairdocs.org/incident/19921225051609A), Dec 25, 1992: Gulstm 680FL, Lester, WA, Destroyed, 1 fatal. After leveling, seen make turns and then a dive. Leveled off prior impact. Left engine at low power. No defects. (.19) no preliminary accident narrative…

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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