# NTSB SEA06CA088: Potts MA-5, N413AC, Kalispell, MT, April 27, 2006

- Type: NTSB accident investigation
- Classification: Accident · Minor injuries · Data collection · Final report
- Date: April 27, 2006, 15:30 local (21:30 UTC)
- Place: Kalispell, MT
- Coordinates: 48.310554, -114.256111
- Nearby events: https://openairdocs.org/map.md?lat=48.3106&lon=-114.2561&mi=10
- Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping)
- Highest injury: Minor injuries
- Injuries: 1 minor
- Status: Completed, report October 3, 2006
- Report: Approved by Office Director
- NTSB case key (mKey): 63588
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=SEA06CA088
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/63588/pdf
- Page: https://openairdocs.org/ntsb/SEA06CA088

## Probable cause

Separation of the left main landing gear during the landing roll for an undetermined reason, which resulted in the airplane nosing down.

## Sequence of events

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

- Airframe/component/system failure/malfunction, landing - roll
  - landing gear,main gear - separation (cause)
- Nose down, landing - roll
  - terrain condition - runway

## Analysis

According to the pilot, the airplane "pulled to the right after landing straight."  He applied left rudder and brake, and the left main landing gear leg "broke off near weld 8 inches above axle."  The gear leg dug into the asphalt, and the airplane nosed down.  An FAA inspector examined the airplane and reported structural damage to the fuselage near the left gear attachment point.  The reason for the failure of the left main landing gear was not determined.

## Factual narrative

On April 27, 2006, about 1530 mountain daylight time, a Potts MA-5 amateur-built experimental airplane, N413AC, sustained substantial damage when the left main landing gear separated during the landing roll on runway 20 at Glacier Park International Airport, Kalispell, Montana.  The private pilot, the sole occupant, received minor injuries.  The airplane was registered to a private individual and operated by the pilot.  Visual meteorological conditions prevailed and no flight plan was filed for the 14 CFR Part 91 personal local flight.

According to the pilot, the airplane "pulled to the right after landing straight."  He applied left rudder and brake, and the left main landing gear leg "broke off near weld 8 inches above axle."  The gear leg dug into the asphalt, and the airplane nosed down.  An FAA inspector examined the airplane and reported structural damage to the fuselage near the left gear attachment point.  The reason for the failure of the left main landing gear was not determined.

## Aircraft

- Registration: N413AC (not matched to a registry record)
- Reported make and model: Potts MA-5
- Category: Airplane, amateur-built
- Serial number: 263
- Engines: Lycoming O-320-E2D reciprocating
- Damage: Substantial damage
- Flight: Personal, Part 91
- Airworthiness certificate: Special, Experimental (Special)
- Departed: GPI, Kalispell, MT
- Destination: GPI
- Airport: GCI, Glacier Park International, runway 20

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 74; private; airplane ratings: single-engine land; medical: class 3; flight hours: 1,018 total, 102 in this make and model, 13 in the last 90 days, 4 in the last 30 days

## Weather

- Conditions: Visual (VMC), Day

## 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 20060427004749A](https://openairdocs.org/incident/20060427004749A), Apr 27, 2006: Amtr MA5, Kalispell, MT, Substantial damage. (-23) Aircraft landed normally on runway 20. Given taxi instructions to turn left on runway 12. Apparently, right brake locked up, and aircraft went up on its…

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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