# NTSB CHI86LA085: Cessna 401B, N777CS, Milwaukee, WI, February 9, 1986

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Limited investigation · Final report
- Date: February 8, 1986, 22:05 local (Feb 9, 1986, 04:05 UTC)
- Place: Milwaukee, WI
- Coordinates: 42.97961, -87.900299 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=42.9796&lon=-87.9003&mi=10
- Phase of flight: [Taxi](https://openairdocs.org/ntsb-phases/250) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 1 uninjured
- Status: Completed
- Report: Approved by Office Director
- NTSB case key (mKey): 13422
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CHI86LA085
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/13422/pdf
- Page: https://openairdocs.org/ntsb/CHI86LA085

## Sequence of events

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

- Main gear collapsed, taxi - from landing
  - wing,wing rib - undetermined (cause)
  - landing gear,gear locking mechanism - disconnected (cause)

## Analysis

WHILE TAXIING TO PARK, THE LEFT MAIN LANDING GEAR COLLAPSED.INVESTIGATION REVEALED THAT THE LEFT HAND GEAR SUPPORT HAD TORN FROM THE WING RIB TO WHICH IT WAS BOLTED. ON THE FAA MALFUNCTION OR DEFECT REPORT SUBMITTED BY THE OPERATOR, COMPANY OFFICIALS STATED THAT IT APPEARED THAT THE GEAR HAD A HEAVY SIDE LOAD PLACED UPON IT AT SOME UNKNOWN TIME. THE PILOT STATED THAT THE LANDING PRIOR TO THE ACCIDENT WAS NORMAL.

## Aircraft

- Registration: [N777CS](https://openairdocs.org/deregistered/N777CS-1989-10-27), registration cancelled 1989-10-27, S/N 4010152 (OpenAirDocs)
- Reported make and model: CESSNA 401B
- Registry model: [Cessna 401](https://openairdocs.org/model/cessna-401) (registry code 207590C) (OpenAirDocs)
- Category: Airplane
- Serial number: 401-0152
- Airframe hours: 5469
- Engines: CONTINENTAL TSIO-520-E 300 horsepower reciprocating
- Damage: Substantial damage
- Flight: Part 135
- Operator: Midwest Aviation Corp.
- Airworthiness certificate: Standard, Normal
- Last inspection: 100 hour, January 23, 1986, 26 hours before
- Departed: GRB, GREEN BAY, WI
- Flight plan: IFR
- Airport: MKE, Mitchell Field

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 24; flight instructor, commercial; airplane ratings: multi-engine land, single-engine land; instrument ratings: airplane; medical: class 1, valid medical--w/ waivers/lim; seat: left; flight hours: 1,728 total, 66 in this make and model, 1,614 as pilot in command, 209 in the last 90 days, 4 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Night/dark
- Wind: 310° at 10 knots
- Visibility: 10 statute miles
- Lowest ceiling: 2,000 ft overcast
- Temperature: 25 °F, dew point 19 °F
- Altimeter: 30.00 inHg

## 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 19860208002349A](https://openairdocs.org/incident/19860208002349A), Feb 8, 1986: Cessna 401, Milwaukee, WI, Substantial damage. Left main gear collapsed during taxi to parking. Suspect heavy side load caused gear support to tear out.

## Other investigations on N777CS (1)

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 CHI84LA130](https://openairdocs.org/ntsb/CHI84LA130), Mar 15, 1984: Cessna 401 (N777CS), Chicago, IL, 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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