# NTSB CHI84LA128: Cessna 421B, N41022, Madison, WI, March 10, 1984

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Limited investigation · Final report
- Date: March 10, 1984, 15:15 local (21:15 UTC)
- Place: Madison, WI
- Coordinates: 43.099151, -89.310737 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=43.0992&lon=-89.3107&mi=10
- Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 2 uninjured
- Status: Completed
- Report: Approved by Office Director
- NTSB case key (mKey): 12559
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CHI84LA128
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/12559/pdf
- Page: https://openairdocs.org/ntsb/CHI84LA128

## Sequence of events

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

- Main gear collapsed, landing - roll
  - weather condition - crosswind (contributing factor)
  - landing gear,main gear strut - failure,total (cause)
  - maintenance,alignment - improper, other maintenance personnel (cause)
- In flight collision with object, landing - roll
  - object - runway light (contributing factor)
  - directional control - not possible, pilot in command (cause)
  - landing gear,main gear attachment - overload (contributing factor)
  - ground loop/swerve - uncontrolled, pilot in command (contributing factor)

## Analysis

THE ACFT WENT OFF THE RWY TO THE LEFT DURING LANDING. THERE WAS A CROSSWIND OF 15-28 KTS AT THE TIME. THE PLT SAID THE ACFT VEERED LEFT AND COULD NOT BE CONTROLLED. AFTER THE ACCIDENT THE WAS 464P-26 BOLT AND 5133-4032 SPACER WERE SHEARED OFF BOTH THE LEFT AND RIGHT BELLCRANK ASSEMBLIES. A MECHANIC SAID THESE WERE OVERLOAD FAILURES WITH NO SIGNS OF FATIGUE.

## Aircraft

- Registration: [N41022](https://openairdocs.org/deregistered/N41022-1984-10-25), registration cancelled 1984-10-25, S/N 421B0402 (OpenAirDocs)
- Reported make and model: CESSNA 421B
- Registry model: [Cessna 421B](https://openairdocs.org/model/cessna-421b) (registry code 2076014) (OpenAirDocs)
- Category: Airplane
- Serial number: 4210402
- Airframe hours: 2906
- Engines: CONTINENTAL GTSIO-520-H 375 horsepower reciprocating
- Damage: Substantial damage
- Flight: Instructional, Part 91
- Registered owner: Norland Corporation
- Airworthiness certificate: Standard, Normal
- Airport: MSN, Dane County, runway 18, 9,005 × 150 ft, concrete

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 43; commercial; airplane ratings: multi-engine land, single-engine land; instrument ratings: airplane; medical: class 1, valid medical--no waivers/lim.; seat: left; flight hours: 1,600 total, 418 in this make and model, 1,553 as pilot in command, 39 in the last 90 days, 1 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Wind: 240° at 15 knots, gusting 28
- Visibility: 10 statute miles
- Lowest ceiling: 10,000 ft overcast
- Altimeter: 29.00 inHg
- Observed at: MSN

## 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 19840310005519A](https://openairdocs.org/incident/19840310005519A), Mar 10, 1984: Cessna 421B, Madison, WI, Substantial damage. Bolt and spacer were sheared off both left and right hand bellcrank assemblies. Landing gear collapsed when landing

## Other investigations on N41022 (2)

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.

- [NTSB MIA79FLG25](https://openairdocs.org/ntsb/MIA79FLG25), Jul 2, 1979: Cessna 152 (N41022), Greeleyville, SC, substantial damage
- [NTSB MIA79FLG24](https://openairdocs.org/ntsb/MIA79FLG24), Jun 21, 1979: Cessna 421B (N41022), Trenton, SC, substantial damage

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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