Runway excursion Accident Maule MX-7-235 Super Rocket N114MK, 11 May 2012
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ASN Wikibase Occurrence # 145720
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Type:Silhouette image of generic M7 model; specific model in this crash may look slightly different    
Maule MX-7-235 Super Rocket
Registration: N114MK
MSN: 10022-C
Fatalities:Fatalities: 0 / Occupants: 1
Aircraft damage: Substantial
Location:Roche Harbor airport (WA09), Roche Harbor, WA -   United States of America
Phase: Landing
Departure airport:Anacortes, WA (74S)
Destination airport:Roche Harbor, WA (WA09)
Investigating agency: NTSB
Confidence Rating: Accident investigation report completed and information captured
The pilot/owner was conducting a short personal flight in the tailwheel-equipped airplane. The departure, flight, and approach to the paved 30-ft by 3,593-ft runway were all normal, and the wind was calm. The pilot made a normal and uneventful three-point landing, but immediately after touchdown, the airplane veered sharply to the left. The pilot applied full right rudder and some right brake, but he was unable to keep the airplane on the runway. The airplane departed the left side of the runway, traversed an adjacent grassy area, and struck a drainage ditch about 50 ft from the runway. The airplane sustained substantial damage.

Postaccident examination of the airplane revealed that the left brake master cylinder piston rod was damaged such that it could prevent release of brake pressure. The damage was attributed to normal operation of the parking brake, during which a locking lever formed multiple cuts and ridges in the rod, and, under certain conditions, could prevent the free travel required for release of brake pressure. Although the damage to the piston rod would have been detectable by a detailed inspection, its nature, extent, and location limited its ability to be detected under the scope of a typical annual inspection. In addition, the pilot had not had any previous occurrences of dragging or stuck brakes, which would have warranted a more detailed inspection of the brake system components. Once airborne, the pilot had no way to detect, prevent, or eliminate a locked wheel due to this condition.

Probable Cause: A damaged brake master cylinder piston rod, which resulted in a landing with the left brake applied. The damage was a result of normal parking brake operation.


FAA register:

Accident investigation:
Investigating agency: NTSB
Status: Investigation completed
Duration: 2 years and 7 months
Download report: Final report

Revision history:

19-May-2012 10:16 Geno Added
21-Dec-2016 19:28 ASN Update Bot Updated [Time, Damage, Category, Investigating agency]
27-Nov-2017 20:42 ASN Update Bot Updated [Operator, Other fatalities, Departure airport, Destination airport, Source, Narrative]

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