Runway excursion Accident Aero Designs Pulsar XP N204BH, Sunday 25 September 2022

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Date:	Sunday 25 September 2022
Time:	09:30 LT
Type:	Aero Designs Pulsar XP
Owner/operator:	Private
Registration:	N204BH
MSN:	468
Year of manufacture:	2004
Total airframe hrs:	1501 hours
Engine model:	Rotax 912S
Fatalities:	Fatalities: 0 / Occupants: 1
Other fatalities:	0
Aircraft damage:	Substantial
Category:	Accident
Location:	Big Bear City Airport (L35), CA - United States of America
Phase:	Landing
Nature:	Private
Departure airport:	Apple Valley Airport, CA (APV/KAPV)
Destination airport:	Big Bear, CA
Investigating agency:	NTSB
Confidence Rating:	Accident investigation report completed and information captured

Narrative:
The pilot in the experimental amateur-built tricycle landing gear equipped airplane reported that, he was not aware that a 10-mph tailwind existed during landing. He normally touches down at 90 mph, however with the tailwind, the airplane's ground speed was 104 mph when the airplane touched down and a severe shimmy ensued. The pilot applied the brakes, however the left side brake failed, and the airplane veered right, exited the right side of the runway, and subsequently impacted a hangar. The airplane sustained substantial damage to the left wing and engine mounts.
Post-accident examination of the airplane revealed that the left main landing gear wheel pant inboard bracket rivets failed, and the wheel pant severed the plastic hydraulic brake line.

Probable Cause: The pilot's inability to maintain directional control after landing with an excessive ground speed due to a tailwind which, resulted in a severe shimmy which subsequently damaged a hydraulic brake line.

Accident investigation: