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NYC90LA170 · Cessna 340A

22 Jul 1990 · Prospect, PA, United States

Brennan Aviation Cessna 340A · Accident: main gear collapsed during landing

From Nantucket Memorial Airport (ACK) to an unrecorded destination

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Event

NTSB case
NYC90LA170
Event typeAccident: someone killed or seriously injured, or the aircraft substantially damaged (NTSB definition). Incident: an occurrence that affected or could have affected safety, short of that. Glossary
Accident
InvestigationHow far the investigation had got when the record was published: preliminary, ongoing, final or completed. Unknown where the source does not say. Glossary
Completed
API-reported fatalities
0 · all aircraft and ground
Ground fatalities
0
OperationWhat kind of flying it was, grouped by the rules it flew under: airline (US Part 121), air taxi and commuter (Part 135), general aviation (Part 91 and similar), military or government. Glossary
General aviation
WeatherVisual meteorological conditions (VMC): good enough to fly by looking outside. Instrument conditions (IMC): cloud or low visibility, flying by instruments. Glossary
Visual Meteorological Cond

Cessna 340A

Aircraft type
Cessna 340
Category
Airplane
RegistrationThe aircraft's tail number, such as N12345 or G-ABCD. Registrations are reissued, so the same one years apart can be a different aircraft. Glossary
N555KB
Onboard fatalities
Unknown
Route
From Nantucket Memorial Airport (ACK), Nantucket, MATo not recorded
Aircraft age
Not recorded
Flight rulesThe regulations the flight operated under: in the US, Part 91 (general aviation), Part 121 (airlines), Part 135 (air taxi and commuter) and others; for flights abroad, the NTSB's coarser commercial or non-commercial code. Glossary
Part 91: General Aviation
Phase of flightThe stage of the flight when things started to go wrong: standing, taxi, takeoff, initial climb, en route, maneuvering, approach or landing. Glossary
Landing · landing roll
First occurrenceThe single coded event the NTSB judges best describes what happened (records from 2008 on). Older records name the first occurrence in the sequence instead. Glossary
Main gear collapsed
DamageDestroyed: beyond practical repair. Substantial: damage that affects the structure, performance or handling and normally needs major repair. Minor: less than that. Glossary
Substantial

Cause areas

  • Landing gear, gear locking mechanism › Separation
  • Landing gear, gear locking mechanism › Sheared
  • Terrain condition › Rough/uneven
  • Terrain condition › Wet

Approximate · Coordinates as recorded by the NTSB; no uncertainty radius is established.

NTSB narrative

THE PILOT SAID THAT TOUCHDOWN WAS NORMAL AND AFTER ROLLING APPROXIMATELY 300 FEET THE FIRST INDICATION THAT ANYTHING WAS WRONG WAS SEEING AND HEARING THE RIGHT PROPELLER STRIKING THE RUNWAY. THE RIGHT LANDING GEAR FOLDED. THE AIRPLANE STARTED SLIDING USING THE RIGHT PROPELLER AS A SKID. THE AIRPLANE SLID TO THE RIGHT OF THE RUNWAY AND STOPPED 600 FEET FURTHER DOWN THE RUNWAY IN A MARSHY AREA. INSPECTION REVEALED THE RIGHT MAIN LANDING GEAR DOWN LOCK LINKAGE SEPARATED BETWEEN THE ROD END AND THE SIDE BRACE LOCK LINK ASSEMBLY. THE END FITTING BOLT WAS SHEARED AT THE FITTING. THE RUNWAY SURFACE WAS WET AND CONSISTED OF TAR AND CHIP (ALMOST LIKE GRAVEL).

Probable cause

AN ON GROUND COLLISION WITH TERRAIN AFTER THE RIGHT MAIN LANDING GEAR SIDE BRACE FAILED DUE TO SHEAR FROM THE SOFT, WET, ROUGH RUNWAY, ALLOWING THE RIGHT MAIN LANDING GEAR TO COLLAPSE.

Verbatim NTSB analysis and probable cause from the NTSB dataset

Sources

NTSB record NYC90LA170
Event ID
20001212X23809
Case number
NYC90LA170
Dataset
historical-pre2008
Source SHA-256
89e2df6d848e7ab3b42e7d7c7a03ff403303057a26ca04c95b3ea67201c3ce74
Source notes (4)
  • Unreviewed is an editorial label, not an investigation status. API-sourced is not report-checked or human-reviewed. Explicit event totals are used without summing aircraft injury tables; onboard allocation is withheld. Unknown values remain unknown. The operation category is mapped from the NTSB-reported FAR part and has not been reviewed.
  • Filled from the NTSB case API where the bulk record had no value: investigation status. Values present in the bulk record are kept.
  • The date is the local date, which is the same as the UTC date the NTSB stores.
  • API snapshot SHA-256: 6b4d6cc02d3447e356f224d4e4d77559394d46dfde244d06d6c51c374edd51da; retrieved 2026-09-23T05:32:45.502Z.