Accident Piper PA-46-500TP N504SR, Tuesday 15 March 2005
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Date:Tuesday 15 March 2005
Time:15:10 LT
Type:Silhouette image of generic P46T model; specific model in this crash may look slightly different    
Piper PA-46-500TP
Owner/operator:Private
Registration: N504SR
MSN: 4697165
Year of manufacture:2003
Total airframe hrs:186 hours
Engine model:Pratt & Whitney PT6A-42A
Fatalities:Fatalities: 0 / Occupants: 2
Other fatalities:0
Aircraft damage: Substantial
Category:Accident
Location:Flagstaff, Arizona -   United States of America
Phase: Unknown
Nature:Private
Departure airport:Heber, UT (36U)
Destination airport:Flagstaff-Pulliam Airport, AZ (FLG/KFLG)
Investigating agency: NTSB
Confidence Rating: Accident investigation report completed and information captured
Narrative:
The airplane veered off the left side of the runway during the landing roll and the nose landing gear collapsed upon impact with a snow bank. The pilot reported that the airplane touched down normally on the main landing gear, but when the nose landing gear touched down the airplane veered suddenly and violently to the left. He believed the nose landing gear was not responding to normal control inputs. The tire and skid marks on the runway were consistent with the pilot's statement and showed that the airplane's track diverged in excess of 70 degrees from the runway centerline just after nose wheel touchdown. Examination of the tires disclosed that the nose tire was scrubbed perpendicularly to the tire tread from right to left. No flat spots or other unusual signatures were observed on the main tires or the brakes. Post accident investigation of the nose landing gear system revealed the bolt that attaches the hydraulic actuator to the engine mount was sheared and the nose gear steering arm was fractured. Examination of the steering arm revealed it met the manufacturer's specifications and its failure, along with the bolt, was determined to be overload. Examination of the steering bungee revealed no obvious anomalies. According to the airplane manufacturer, there were 32 prior reports of temporary and unexplained loss of directional control immediately following nose wheel touchdown during landings, primarily when crosswind conditions are present and/or when applying full propeller reverse. Investigation of those events by the manufacturer's engineering department found that a contributing cause of the directional control problems was identified as insufficient nose gear steering authority, which under certain conditions, can allow the nose gear steering system rotation to momentarily exceed the pilot's input. The manufacturer issued a service bulletin, which recommended the incorporation of nose gear installation modifications. The modifications were intended to increase the pilot's steering authority and remedy the directional control problems. According to manufacturer, the accident airplane was manufactured after all of the nose gear modifications were implemented on the production line.

Probable Cause: the loss of directional control during landing for undetermined reasons.

Accident investigation:
cover
  
Investigating agency: NTSB
Report number: LAX05LA116
Status: Investigation completed
Duration: 1 year and 5 months
Download report: Final report

Sources:

NTSB LAX05LA116

Revision history:

Date/timeContributorUpdates
10-Oct-2022 16:12 ASN Update Bot Added

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