Runway excursion Accident Piper PA-18-135 Super Cub N9952Q,
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ASN Wikibase Occurrence # 141984
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Date:Monday 2 January 2012
Type:Silhouette image of generic PA18 model; specific model in this crash may look slightly different    
Piper PA-18-135 Super Cub
Registration: N9952Q
MSN: 18-3579
Year of manufacture:1954
Total airframe hrs:3962 hours
Engine model:Lycoming O-360-B2B
Fatalities:Fatalities: 0 / Occupants: 2
Aircraft damage: Substantial
Location:Astronaut Kent Rominger Airport - 8V1, Del Norte, CO -   United States of America
Phase: Landing
Departure airport:Del Norte, CO (8V1)
Destination airport:Del Norte, CO (8V1)
Investigating agency: NTSB
Confidence Rating: Accident investigation report completed and information captured
The pilot, who held a private pilot certificate, was receiving dual instruction from a certified flight instructor (CFI) to become familiar with his newly acquired tailwheel-equipped airplane. After practicing some standard flight maneuvers at altitude, the pilot returned to the departure airport to practice full stop landings and takeoffs. The CFI demonstrated the first landing, and then the pilot performed the next four landings and takeoffs with the CFI monitoring the controls and providing assistance when necessary. The CFI stated that the pilot's first landing was normal, the second landing required minor directional control assistance, the third landing required no assistance, and the fourth landing required some assistance from the base leg to final approach but the landing and roll were normal. On the fifth landing, the pilot made a nice three-point touchdown and rolled straight ahead. During the landing roll, the airplane suddenly swerved to the right and the CFI noticed that the pilot had already applied full left corrective rudder. The CFI then applied the left brake, but the application was ineffective. He then applied right brake to slow the airplane's pending departure off the runway. The airplane nosed over and came to rest in a snow bank that was bordering the runway. The top of the rudder sustained substantial damage.

The airplane was equipped with a supplemental type certificate non-standard brake system. The CFI stated that, when he had ferried the airplane, he noted that the brake system was extremely sensitive. The CFI stated that he told the pilot early in his instruction that the use of the brakes should be avoided in normal operations due to their sensitivity. The CFI stated that he believes that the sensitivity of the brake system was a causal factor in the accident.
Probable Cause: The pilot's loss of directional control during the landing roll, which resulted in a runway excursion. Contributing to the accident were the sensitivity of the brake system and the certified flight instructor pilot's delayed remedial action.

Accident investigation:
Investigating agency: NTSB
Report number: CEN12CA132
Status: Investigation completed
Duration: 2 months
Download report: Final report


FAA register:

History of this aircraft

Other occurrences involving this aircraft
27 December 2000 N9952Q 0 RAMONA, California sub


Revision history:

20-Jan-2012 16:00 Geno Added
20-Jan-2012 16:37 Geno Updated [Location, Departure airport, Destination airport, Source, Narrative]
04-Jun-2012 20:34 Geno Updated [Source, Narrative]
21-Dec-2016 19:26 ASN Update Bot Updated [Time, Damage, Category, Investigating agency]
27-Nov-2017 17:53 ASN Update Bot Updated [Operator, Other fatalities, Departure airport, Destination airport, Source, Narrative]

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