# NTSB FTW85LA218: Cessna 421, N888K, Mckinney, TX, May 10, 1985

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Limited investigation · Final report
- Date: May 10, 1985, 17:27 local (22:27 UTC)
- Place: Mckinney, TX
- Coordinates: 33.180244, -96.590591 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=33.1802&lon=-96.5906&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): 21747
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=FTW85LA218
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/21747/pdf
- Page: https://openairdocs.org/ntsb/FTW85LA218

## Sequence of events

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

- Nose gear collapsed, taxi - from landing
  - airport facilities,runway/landing area condition - soft (cause)
  - landing gear,nose gear - failure,total

## Analysis

AFTER LANDING WHILE TAXIING ON THE RWY, THE ACFT'S NOSE WHEEL STARTED BOGGING DOWN IN SOFT ASPHALT ON THE RWY. THE SOFT ASPHALT WAS PUSHED ALONG IN FRONT OF THE WHEEL UNTIL IT CAUSED ENOUGH RESISTANCE TO OVERSTRESS THE NOSE GEAR CAUSING IT TO COLLAPSE. THE ACFT'S NOSE THEN IMPACTED THE RWY RESULTING IN SUBSTANTIAL DAMAGE TO THE ACFT. THE ASPHALT HAD NOT BEEN ROLLED/PACKED ENOUGH TO SUPPORT THE WEIGHT OF THE SUBJECT ACFT.

## Aircraft

- Registration: [N888K](https://openairdocs.org/deregistered/N888K-2017-10-20), registration cancelled 2017-10-20, S/N 421-0088, built 1968 (OpenAirDocs)
- Reported make and model: CESSNA 421
- Registry model: [Cessna 421](https://openairdocs.org/model/cessna-421) (registry code 2076010) (OpenAirDocs)
- Registry engine: [Continental GTSIO-520-C](https://openairdocs.org/engine/continental-gtsio-520-c) (registry code 17035, reciprocating) (OpenAirDocs)
- Category: Airplane
- Serial number: 4210088
- Engines: CONTINENTAL GTSIO-520-D 375 horsepower reciprocating
- Damage: Substantial damage
- Flight: Personal, Part 91
- Operator: Km&D Energy Inc.
- Registered owner: Mk & D Energy, Inc.
- Departed: F26, PLANO, TX
- Airport: TX05, Aero Country, runway 17, 2,950 × 40 ft, asphalt

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; medical: unknown, unknown; seat: left

## Weather

- Conditions: Visual (VMC), Day
- Wind: 140° at 11 knots
- Visibility: 10 statute miles
- Lowest ceiling: 25,000 ft overcast
- Temperature: 82 °F, dew point 70 °F
- Altimeter: 29.00 inHg
- Observed at: DAL, 35 nm away

## 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 19850510016649A](https://openairdocs.org/incident/19850510016649A), May 10, 1985: Cessna 421, Mckinney, TX, Substantial damage. Nose gear collapsed while taxiing back on the runway after landing. Claimed soft asphalt on runway caused collapse.

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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