# NTSB CHI96LA122: Cessna 210K, N9470M, West Chicago, IL, April 1, 1996

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Limited investigation · Final report
- Date: April 1, 1996, 13:55 local (19:55 UTC)
- Place: West Chicago, IL
- Coordinates: 41.8805, -88.220466 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=41.8805&lon=-88.2205&mi=10
- Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 1 uninjured
- Status: Completed, report December 16, 1996
- Report: Approved by Office Director
- NTSB case key (mKey): 10220
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CHI96LA122
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/10220/pdf
- Page: https://openairdocs.org/ntsb/CHI96LA122

## Probable cause

Maintenance personnel's failure to comply with an airworthiness directive on the landing gear which led to a retraction/extension assembly malfunction.

## Sequence of events

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

- Gear retraction on ground, landing - flare/touchdown
  - landing gear,normal retraction/extension assembly - malfunction (cause)
  - maintenance,compliance with ad - not complied with, other maintenance personnel (cause)

## Analysis

On landing the right main landing gear collapsed.  Subsequent examination revealed that the extension and retraction mechanism had malfunctioned.  Airworthiness directives pertaining to the landing gear directly affecting the retraction and extension function had not been accomplished.

## Factual narrative

On April 1, 1996, at 1355 central standard time, a Cessna 210K, N9470M, operated by a private pilot, sustained substantial damage when the right main gear collapsed on landing.  The airplane landed on runway 10 (4,751' x 75' dry/asphalt) at DuPage Airport, West Chicago, Illinois.  The pilot reported no injuries.  The local personal 14 CFR Part 91 flight was operating in visual meteorological conditions.  No flight plan was on file.  The flight departed West Chicago, Illinois, about 1200.

Subsequent to the accident an examination of the landing gear retraction/extension mechanism was conducted by the Federal Aviation Administration (FAA).  According to the FAA inspector there were airworthiness directives (AD) pertaining the landing gear which had not been accomplished.  The same inspector stated the AD's directly affected the function of the retraction/extension mechanism system.

The pilot told FAA inspectors that he did not have a current biennial flight review.  His FAA third class medical was issued on August 15, 1995; however, it was valid for three months and had expired at the time of the accident.

## Aircraft

- Registration: [N9470M](https://openairdocs.org/aircraft/N9470M), registered now, S/N 21059370, built 1970 (OpenAirDocs)
- Reported make and model: Cessna 210K
- Registry model: [Cessna 210K](https://openairdocs.org/model/cessna-210k) (registry code 2073446) (OpenAirDocs)
- Registry engine: [Continental IO-520 series](https://openairdocs.org/engine/continental-io-520-series) (registry code 17032, reciprocating) (OpenAirDocs)
- Category: Airplane
- Serial number: 21059370
- Airframe hours: 2204
- Engines: Continental IO-520-L 285 horsepower reciprocating
- Damage: Substantial damage
- Flight: Personal, Part 91
- Registered owner: Frnk P. Riggio
- Airworthiness certificate: Standard, Normal
- Last inspection: Annual, August 1, 1995, 20 hours before
- Departed: DPA
- Airport: DPA, Du Page Airport, runway 10, 4,751 × 75 ft, asphalt

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 68; private; airplane ratings: single-engine land; instrument ratings: airplane; medical: class 3, expired; seat: left; flight hours: 2,500 total

## Weather

- Conditions: Visual (VMC), Day
- Wind: 10° at 10 knots
- Visibility: 40 statute miles
- Lowest ceiling: none
- Altimeter: 30.00 inHg
- Observed at: DPA

## 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 19960401009449A](https://openairdocs.org/incident/19960401009449A), Apr 1, 1996: Cessna 210K, Chicago/West Ch, IL, Substantial damage. Right main gear collapsed landing. Possible hard landing. No biennial and operating with three ADS not complied. (-23) on April 01, 1996 at approximately 1400…

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.

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.