# NTSB CHI91DEP05: Piper PA-25-235, N855SD, Neenah, WI, May 27, 1991

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Final report
- Date: May 27, 1991, 06:15 local (11:15 UTC)
- Place: Neenah, WI
- Coordinates: 44.339534, -89.139396 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=44.3395&lon=-89.1394&mi=10
- Phase of flight: [Takeoff](https://openairdocs.org/ntsb-phases/300) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 1 uninjured
- Status: Completed, report March 24, 1993
- Report: Approved by Office Director
- NTSB case key (mKey): 14838
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CHI91DEP05
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/14838/pdf
- Page: https://openairdocs.org/ntsb/CHI91DEP05

## Probable cause

THE PILOT IN COMMAND'S FAILURE TO ATTAIN SUFFICIENT AIRSPEED TO ACHIEVE FLIGHT, AND HIS FAILURE TO ABORT THE TAKEOFF.

## Sequence of events

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

- Loss of control - on ground/water, takeoff - roll/run
  - terrain condition - dirt bank/rising embankment
  - airspeed - not attained, pilot in command (cause)
  - abort - not performed, pilot in command (cause)

## Analysis

THE AIRCRAFT WAS LOADED WITH A LIQUID PESTICIDE IN PREPARATION FOR AN AERIAL APPLICATION FLIGHT.  ON TAKEOFF THE AIRCRAFT FAILED TO CLEAR A DIRT EMBANKMENT 200' BEYOND THE DEPARTURE END OF THE 2,090' RUNWAY.  THE LOAD WAS LOST WHEN IT LEAKED OUT OF THE HOPPER AFTER IMPACT.  EXACT LOADING WEIGHT AND BALANCE COULD NOT BE DETERMINED.  NO MECHANICAL DEFECTS WERE FOUND DURING POST ACCIDENT EXAMINATION OF THE AIRCRAFT AND ENGINE.

## Aircraft

- Registration: [N855SD](https://openairdocs.org/deregistered/N855SD-2013-05-31), registration cancelled 2013-05-31, S/N 25-4543, built 1968 (OpenAirDocs)
- Reported make and model: PIPER PA-25-235
- Registry model: [Piper PA-25-235](https://openairdocs.org/model/piper-pa-25-235) (registry code 7102504) (OpenAirDocs)
- Registry engine: [Lycoming 0-540 series](https://openairdocs.org/engine/lycoming-0-540-series) (registry code 41532, reciprocating) (OpenAirDocs)
- Category: Airplane
- Serial number: 25-4543
- Engines: LYCOMING O-540-B2C5 235 horsepower reciprocating
- Damage: Substantial damage
- Flight: Aerial application, Part 137
- Operator: Ag-Air Inc.
- Registered owner: Ag-Air Inc.
- Airworthiness certificate: Special, Restricted (Special)
- Last inspection: Annual, January 2, 2000
- Airport: 79C, Brennand, runway 18, 2,090 × 40 ft, asphalt

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 42; commercial; airplane ratings: single-engine land; instrument ratings: airplane; medical: class 2, valid medical--no waivers/lim.; seat: front; flight hours: 2,850 total, 1,200 in this make and model

## Weather

- Conditions: Visual (VMC), Day
- Wind: calm
- Visibility: 4 statute miles
- Lowest ceiling: 5,000 ft broken
- Temperature: 64 °F, dew point 61 °F
- Altimeter: 29.00 inHg
- Observed at: ATW, 5 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 19910527017509A](https://openairdocs.org/incident/19910527017509A), May 27, 1991: Piper PA25235, Neenah, WI, Substantial damage. Unable to lift on takeoff roll overran end of runway and struck embankment. Indicates over gross but load drained.

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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