# NTSB CHI87DEE06: Schleicher ASK-21, N694KS, Plainfield, IL, March 7, 1987

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Final report
- Date: March 7, 1987, 15:20 local (21:20 UTC)
- Place: Plainfield, IL
- Coordinates: 41.610282, -88.20021 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=41.6103&lon=-88.2002&mi=10
- Phase of flight: [Initial climb](https://openairdocs.org/ntsb-phases/350) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 2 uninjured
- Status: Completed, report March 31, 1989
- Report: Approved by Office Director
- NTSB case key (mKey): 13555
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CHI87DEE06
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/13555/pdf
- Page: https://openairdocs.org/ntsb/CHI87DEE06

## Sequence of events

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

- Miscellaneous/other, takeoff - initial climb
  - emergency procedure - performed, pilot of other aircraft
- Forced landing, maneuvering - turn to landing area (emergency)
- Dragged wing,rotor,pod,float or tail/skid, maneuvering - turn to landing area (emergency)
  - terrain condition - ground
  - clearance - misjudged, pilot in command (cause)

## Analysis

THE GLIDER PLT RPRTD THAT DRG TAKEOFF, THE TOW PLT RELEASED THE TOW ROPE AT APRX 15' AGL. RPRTDLY, HE RELEASED THE TOW ROPE DUE TO A PERCEIVED LACK OF TAKEOFF & CLIMB PERFORMANCE. AFTER BEING RELEASED, THE GLIDER PLT MADE A RIGHT TURN TO AVOID UNACCEPTABLE TERRAIN AHEAD. WHILE TURNING, THE RIGHT WING TIP HIT THE GROUND & THEN THE GLIDER CRASH LANDED.

## Aircraft

- Registration: [N694KS](https://openairdocs.org/aircraft/N694KS), registered now, S/N 21219, built 1984 (OpenAirDocs)
- Reported make and model: SCHLEICHER ASK-21
- Registry model: [Schleicher ASK-21](https://openairdocs.org/model/schleicher-ask-21) (registry code 38015GY) (OpenAirDocs)
- Registry engine: [NONE](https://openairdocs.org/engine/none) (registry code 00000, none) (OpenAirDocs)
- Category: Glider
- Serial number: 21211
- Airframe hours: 455
- Engines: unknown
- Damage: Substantial damage
- Flight: Personal, Part 91
- Operator: Windy Sity Soaring, Inc.
- Registered owner: Advanced Soaring Club Inc.
- Airworthiness certificate: Standard, Normal
- Last inspection: Annual, March 25, 1986, 48 hours before
- Airport: 1C5, Clow, runway 36, 3,400 × 75 ft, dirt

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 44; commercial; airplane ratings: multi-engine land, single-engine land; instrument ratings: airplane; medical: class 2, valid medical--no waivers/lim.; seat: rear; flight hours: 1,602 total, 15 in this make and model, 1,370 as pilot in command, 40 in the last 90 days, 23 in the last 30 days

## Weather

- Conditions: Visual (VMC), Day
- Wind: 270° at 15 knots, gusting 5
- Visibility: 15 statute miles
- Lowest ceiling: none
- Temperature: 72 °F, dew point 63 °F
- Altimeter: 30.00 inHg
- Observed at: ARR, 17 nm away

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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