# NTSB CHI84LA386: Piper PA25, N4571Y, Sheboygan, WI, September 7, 1984

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Limited investigation · Final report
- Date: September 7, 1984, 14:30 local (19:30 UTC)
- Place: Sheboygan, WI
- Coordinates: 43.699531, -87.740509 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=43.6995&lon=-87.7405&mi=10
- Phase of flight: [Initial climb](https://openairdocs.org/ntsb-phases/350) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 1 uninjured
- Status: Completed
- Report: Approved by Office Director
- NTSB case key (mKey): 12770
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CHI84LA386
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/12770/pdf
- Page: https://openairdocs.org/ntsb/CHI84LA386

## Sequence of events

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

- Loss of control - in flight, takeoff - initial climb
  - weather condition - crosswind (contributing factor)
  - weather condition - gusts (contributing factor)
  - compensation for wind conditions - improper, pilot in command (contributing factor)
  - proper climb rate - not attained, pilot in command (contributing factor)
  - object - tree(s) (contributing factor)
  - maneuver - performed, pilot in command (contributing factor)
  - load jettison - delayed, pilot in command (cause)
  - airspeed(vs) - not maintained, pilot in command (cause)
  - stall/mush - inadvertent, pilot in command
- In flight collision with terrain/water, descent - uncontrolled

## Analysis

PLT INITIATED TAKEOFF IN STRONG GUSTY X-WIND. APPROACHING TREE LINE, ACFT BEGAN TO SINK. PLT TURNED TO AVOID TREES AND STALLED ACFT. LOAD JETTISON WAS TOO LATE TO AID IN STALL RECOVERY AND ACFT MUSHED INTO GROUND.

## Aircraft

- Registration: [N4571Y](https://openairdocs.org/aircraft/N4571Y), registered now, S/N 25-4235, built 1967 (OpenAirDocs)
- Reported make and model: PIPER PA25
- 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: 254235
- Airframe hours: 3445
- Engines: LYCOMING O-540-B2C5 235 horsepower reciprocating
- Damage: Substantial damage
- Flight: Aerial application, Part 137
- Registered owner: Agland Air
- Airworthiness certificate: Special, Restricted (Special)
- Last inspection: Annual, April 9, 1984, 169 hours before
- Airport: runway 28, 2,600 ×  ft, grass/turf

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 39; commercial, flight instructor; airplane ratings: single-engine sea, multi-engine land, single-engine land; instrument ratings: airplane; medical: class 2, valid medical--no waivers/lim.; seat: center; flight hours: 9,988 total, 5,140 in this make and model, 220 in the last 90 days

## Weather

- Conditions: Visual (VMC), Day
- Wind: 135° at 15 knots, gusting 20
- Visibility: 10 statute miles
- Lowest ceiling: none
- Temperature: 79 °F

## 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 19840907047609A](https://openairdocs.org/incident/19840907047609A), Sep 7, 1984: Piper PA25235, Sheboygan, WI, Substantial damage. After liftoff in wooded area,aircraft began to sink. Dumped load but settled to ground. Gusty surface wind factor.

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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