# NTSB CHI92LA213: Beech H35, N7957D, Baraboo, WI, July 28, 1992

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Limited investigation · Final report
- Date: July 27, 1992, 22:41 local (Jul 28, 1992, 03:41 UTC)
- Place: Baraboo, WI
- Coordinates: 43.459953, -89.739807 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=43.4600&lon=-89.7398&mi=10
- Phase of flight: [Takeoff](https://openairdocs.org/ntsb-phases/300) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 1 uninjured
- Status: Completed, report July 29, 1993
- Report: Approved by Office Director
- NTSB case key (mKey): 15499
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CHI92LA213
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/15499/pdf
- Page: https://openairdocs.org/ntsb/CHI92LA213

## Probable cause

INADEQUATE MAINTENANCE SERVICE AND AIRCRAFT PREFLIGHT BY THE PILOT. A FACTOR CONTRIBUTING TO THIS ACCIDENT WAS A PARTIAL FAILURE OF THE BRAKE SYSTEM.

## Sequence of events

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

- Airframe/component/system failure/malfunction, takeoff - aborted
  - landing gear,normal brake system - failure,partial (contributing factor)
  - maintenance,service of aircraft/equipment - inadequate, pilot in command (cause)
  - aircraft preflight - inadequate, pilot in command (cause)
- Overrun, takeoff - aborted
- On ground/water collision with object, takeoff - aborted
  - object - tree(s)
  - object - fence post

## Analysis

THE PILOT WAS PERFORMING A NIGHT TAKEOFF WHEN THE COCKPIT ENTRANCE DOOR OPENED.  THE PILOT STATED HE WAS UNABLE TO CLOSE THE DOOR AND DECIDED TO ABORT THE TAKEOFF.  ACCORDING TO THE PILOT, THE BRAKES DID NOT FUNCTION PROPERLY DURING HIS ATTEMPT TO STOP THE AIRPLANE.  THE AIRPLANE DEPARTED THE DEPARTURE END OF THE RUNWAY AND COLLIDED WITH TREES AND FENCE POSTS. AN ON-SCENE INVESTIGATION REVEALED THE HYDRAULIC SYSTEM WAS MECHANICALLY SOUND.  THE BRAKE SYSTEM HYDRAULIC FLUID RESERVOIR WAS FOUND EMPTY OF FLUID.  EVIDENCE OF LEAKING BRAKE FLUID ON THE AIRFRAME AND LANDING GEAR LEG WAS NOT OBSERVED.

## Aircraft

- Registration: [N7957D](https://openairdocs.org/deregistered/N7957D-2023-10-21), registration cancelled 2023-10-21, S/N D-5247, built 1957 (OpenAirDocs)
- Reported make and model: BEECH H35
- Registry model: [Beech H35](https://openairdocs.org/model/beech-h35) (registry code 1151520) (OpenAirDocs)
- Registry engine: [Continental O-470 series](https://openairdocs.org/engine/continental-o-470-series) (registry code 17026, reciprocating) (OpenAirDocs)
- Category: Airplane
- Serial number: D5247
- Airframe hours: 4175
- Engines: CONTINENTAL O-470-G 240 horsepower reciprocating
- Damage: Substantial damage
- Flight: Personal, Part 91
- Operator: David R. & Wanda L. Swanson
- Registered owner: David R. & Wanda L. Swanson
- Airworthiness certificate: Standard, Utility
- Last inspection: Annual, December 6, 1991, 80 hours before
- Departed: C85
- Airport: C85, Baraboo-Dell Muni, runway 1, 4,900 × 75 ft, asphalt

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 30; private; airplane ratings: single-engine land; medical: class 3, valid medical--w/ waivers/lim; seat: left; flight hours: 156 total, 27 in this make and model, 80 as pilot in command

## Weather

- Conditions: Visual (VMC), Night/dark
- Wind: 10° at 2 knots
- Visibility: 10 statute miles
- Lowest ceiling: none
- Temperature: 64 °F, dew point 57 °F
- Altimeter: 29.00 inHg
- Observed at: MSN, 30 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 19920727027639A](https://openairdocs.org/incident/19920727027639A), Jul 27, 1992: Beech H35, Baraboo, WI, Substantial damage. Cabin door came open on liftoff. Tried close then began belated abort. Over heated brakes faded lacked brake fluid

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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