# NTSB NYC90LA170: Cessna 340A, N555KB, Prospect, PA, July 22, 1990

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Limited investigation · Final report
- Date: July 22, 1990, 16:30 local (20:30 UTC)
- Place: Prospect, PA
- Coordinates: 40.899017, -80.040161 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=40.8990&lon=-80.0402&mi=10
- Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 2 uninjured
- Status: Completed, report March 12, 1993
- Report: Approved by Office Director
- NTSB case key (mKey): 36698
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=NYC90LA170
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/36698/pdf
- Page: https://openairdocs.org/ntsb/NYC90LA170

## 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.

## Sequence of events

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

- Main gear collapsed, landing - roll
  - terrain condition - rough/uneven (cause)
  - terrain condition - wet (cause)
  - landing gear,gear locking mechanism - separation (cause)
  - landing gear,gear locking mechanism - sheared (cause)
- Loss of control - on ground/water, landing - roll
- On ground/water encounter with terrain/water, landing - roll
  - terrain condition - rough/uneven (contributing factor)

## Analysis

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).

## Aircraft

- Registration: N555KB (not matched to a registry record)
- Reported make and model: CESSNA 340A
- Category: Airplane
- Serial number: 0689
- Engines: CONTINENTAL TSIO-520-NB 310 horsepower reciprocating
- Damage: Substantial damage
- Flight: Personal, Part 91
- Operator: Brennan Aviation Corp.
- Departed: ACK, NANTUCKET, MA
- Flight plan: IFR
- Airport: NONE, Koehler, runway 28, 2,421 × 40 ft, gravel

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 52; commercial; airplane ratings: multi-engine land, single-engine land; instrument ratings: airplane; medical: class 2, valid medical--w/ waivers/lim; flight hours: 2,569 total, 226 in this make and model, 31 in the last 90 days, 14 in the last 30 days, 3 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Wind: 240° at 5 knots
- Visibility: 3 statute miles
- Lowest ceiling: 4,000 ft overcast
- Temperature: -0 °F, dew point -0 °F

## 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 19900722029269A](https://openairdocs.org/incident/19900722029269A), Jul 22, 1990: Cessna 340A, Prospect, PA, Substantial damage. Right main gear collapsed on landing after hitting soft spots in runway. Down lock linkage separated at rod end.

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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