# NTSB MIA91GA034: Asta N22S, N5056D, Homestead Afb, FL, November 28, 1990

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Final report
- Date: November 28, 1990, 05:45 local (10:45 UTC)
- Place: Homestead Afb, FL
- Coordinates: 25.499198, -80.400131 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=25.4992&lon=-80.4001&mi=10
- Phase of flight: [Unknown](https://openairdocs.org/ntsb-phases/990) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 3 uninjured
- Status: Completed, report March 12, 1993
- Report: Approved by Office Director
- NTSB case key (mKey): 32762
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=MIA91GA034
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/32762/pdf
- Page: https://openairdocs.org/ntsb/MIA91GA034

## Probable cause

THE BENDING OVERSTRESS FAILURE OF THE LEFT MAIN LANDING SCREWJACK AT AN UNDETERMINED TIME DURING FLIGHT FOR UNDETERMINED REASONS.

## Analysis

FLIT EXPERIENCED INFLIT MALFUNCTION OF LDG GEAR SYSTEM WITH UNSAFE GEAR INDICATION.  ON LDG ROLL THE LEFT MAIN LDG GEAR COLLAPSED SMOOTHLY.  THE LEFT MAIN LDG GEAR SCREWJACK WAS FOUND SEPARATED DUE TO BENDING OVERSTRESS.  NO OTHER FAILURES IN THE LDG GEAR SYSTEM WERE NOTED.  ACCORDING TO THE ACFT MANUFACTURER NO FAILURES IN THE LDG GEAR SYSTEM COULD CAUSE BENDING OVERSTRESS OF THE SCREWJACK.  ONLY PLACING THE WEIGHT OF THE AIRPLANE ON A RETRACTING OR EXTENDING GEAR COULD CAUSE THE FAILURE.

## Sequence of events

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

- Airframe/component/system failure/malfunction, unknown
  - landing gear,normal retraction/extension assembly - overload (cause)
  - landing gear,normal retraction/extension assembly - bent (cause)
  - landing gear,normal retraction/extension assembly - undetermined (cause)
- Main gear collapsed, landing - roll

## Aircraft

- Registration: [N5056D](https://openairdocs.org/deregistered/N5056D-2013-08-20), registration cancelled 2013-08-20, S/N N22S-164 (OpenAirDocs)
- Reported make and model: ASTA N22S
- Registry model: [Government Aircraft Factories N22S](https://openairdocs.org/model/government-aircraft-factories-n22s) (registry code 3880103) (OpenAirDocs)
- Category: Airplane
- Serial number: LS-162
- Engines: ALLISON C250-B17E 420 horsepower turbo prop
- Damage: Substantial damage
- Flight: Public aircraft, Part 91
- Registered owner: U.S. Customs Service
- Airworthiness certificate: Standard, Normal
- Flight plan: Company VFR
- Airport: KHST, homestead, AFB, runway 5, 11,700 × 300 ft, concrete

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 50; commercial; airplane ratings: single-engine land, single-engine sea, multi-engine land; instrument ratings: airplane; medical: class 1, valid medical--w/ waivers/lim; seat: left; toxicology performed; flight hours: 7,769 total, 185 in this make and model, 7,446 as pilot in command, 40 in the last 90 days, 8 in the last 30 days, 1 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Dawn
- Wind: 70° at 7 knots
- Visibility: 7 statute miles
- Lowest ceiling: none
- Temperature: 77 °F, dew point 70 °F
- Altimeter: 30.00 inHg
- Observed at: HST

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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