# NTSB CHI88MA026: Beech 200, N334DP, Jefferson, WI, November 16, 1987

- Type: NTSB accident investigation
- Classification: Accident · Fatal · Major investigation · Final report
- Date: November 16, 1987, 08:19 local (14:19 UTC)
- Place: Jefferson, WI
- Coordinates: 43.000278, -88.799766 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=43.0003&lon=-88.7998&mi=10
- Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping)
- Highest injury: Fatal
- Injuries: 8 fatal
- Status: Completed, report July 29, 1992
- Report: Approved by Office Director
- Safety recommendations: Yes
- NTSB case key (mKey): 14172
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CHI88MA026
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/14172/pdf
- Page: https://openairdocs.org/ntsb/CHI88MA026

## Sequence of events

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

- Loss of control - in flight, descent
  - reason for occurrence undetermined (cause)
- Airframe/component/system failure/malfunction, descent - uncontrolled
  - wing - overload
  - design stress limits of aircraft - exceeded (cause)
  - wing - separation
  - cooling system,cowling - separation
- In flight collision with terrain/water, descent - uncontrolled

## Analysis

WHILE CRUISING ABV FRZG LVL AT 12,000', THE FLT WAS CLRD TO DSCND & MAINT 9000'. ABT 1-1/2 MIN LTR, THE FLT DECLARED A MAYDAY (EMERGENCY). RADIO & RADAR CTC WERE LOST & THE ACFT CRASHED IN A NR VERTICAL DSCNT. RADAR DATA SHOWED THAT AFTER STARTING A DSCNT, THE ACFT ENTERED A LEFT/DESCENDING MNVR. SUBSEQUENTLY, THE LEFT OUTBOARD WING PANEL & BOTH ENGS SEPD IN FLT. THE LAST TRANSPONDER REPLY WAS AT 2800'.  AN EXAM REVEALED THE LEFT WING PANEL HAD SEPD FM POSITIVE OVERLOAD. NO FATIGUE OR PRE-EXISTING CRACK WAS FND ON ANY FRACTURE AREA. ALSO, DMG WAS FND ON THE LEFT ENG'S INBOARD COWLING THAT MATCHED DMG ON THE VERTICAL & RGT HORIZONTAL STABILIZERS; HOWEVER, SEQUENCE OF COWLING SEPN WAS NOT VERIFIED. THE SEPD WING PANEL & PARTS OF THE ENG COWLING WERE FOUND ABOUT 3/4 MI FM THE MAIN WRECKAGE. AN NTSB TRAJECTORY STUDY INDCD AN IN-FLT SEPN OCCURRED AT AN ALT OF APRX 5600' AS ACFT WAS HDG SE IN A 50 TO 70 DEG DIVE. ELEV TRIM INDCR WAS FND WITH A FULL NOSE UP INDCN. BOTH PLTS WERE INSTRUMENT RATED.

## Aircraft

- Registration: [N334DP](https://openairdocs.org/deregistered/N334DP-2014-12-02), registration cancelled 2014-12-02, S/N BB-1188, built 1984 (OpenAirDocs)
- Reported make and model: BEECH 200
- Registry model: [Beech B200](https://openairdocs.org/model/beech-b200) (registry code 1152922) (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: BB-1188
- Airframe hours: 1050
- Engines: P&W PT6A-42 850 horsepower turbo prop
- Damage: Destroyed
- Flight: Business, Part 91
- Registered owner: Danpar Aviation, Inc.
- Airworthiness certificate: Standard, Normal
- Last inspection: Continuous airworthiness, October 23, 1987, 14 hours before
- Departed: CGX, CHICAGO, IL
- Destination: C85, BARABOO, WI
- Flight plan: IFR

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 59; flight instructor, commercial; airplane ratings: multi-engine land, single-engine land; instrument ratings: airplane; medical: class 2, valid medical--w/ waivers/lim; toxicology performed; flight hours: 18,000 total, 3,000 in this make and model, 1 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Wind: 180° at 14 knots
- Visibility: 5 statute miles
- Lowest ceiling: 2,300 ft overcast
- Temperature: 48 °F, dew point 43 °F
- Altimeter: 29.00 inHg
- Observed at: MSN, 22 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 19871116064999A](https://openairdocs.org/incident/19871116064999A), Nov 16, 1987: Beech B200, Jefferson, WI, Destroyed, 8 fatal. Lost outboard part of left wing in flight. Observed spinning out of clouds. No defects found. Indicates lost control

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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