<< >> NASA ASRS Report 1077243, March 2013

The pilot of a KIS4 experimental aircraft noted a considerable shimmy from the nose landing gear after landing. When he arrived at the hangar and inspected the nose wheel he discovered that a failed exhaust pipe had been directing hot gases onto the nose wheel assembly; causing a partial failure.

Attributes
ACN	1077243
Time
Date	201303
Local Time Of Day	1201-1800
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	Amateur/Home Built/Experimental
Operating Under FAR Part	Part 91
Flight Phase	Landing
Route In Use	None
Flight Plan	None
Component
Aircraft Component	Exhaust Pipe
Person 1
Function	Pilot Flying Single Pilot
Qualification	Flight Crew Commercial Flight Crew Instrument Flight Crew Multiengine
Experience	Flight Crew Last 90 Days 30 Flight Crew Total 2050 Flight Crew Type 580
Events
Anomaly	Aircraft Equipment Problem Critical

Narrative:

After completing 2 touch and go landings; I landed and the nose wheel gave me an extremely hard shimmy. After the airplane came to a complete halt I taxied to the hangar without further shimmy and inspected the nose wheel. I found that one of the exhaust pipes had broken about 9' from the tip inside the cowling. The ensuing hot gasses were blowing directly on an h-bracket in the nose wheel assembly weakening it causing it to partially fail. This partial failure caused the nose wheel not to track properly upon landing causing the extreme shimmy I felt. I contacted ground control and advised them of what happened in case the missing piece was still on the runway. Except for the extreme shimmy on landing I did not feel anything different in the airplane handling. I do remember the airplane had a slight shimmy during the previous touch and go landings; but nothing out of the ordinary.

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Original NASA ASRS Text

Title: The pilot of a KIS4 experimental aircraft noted a considerable shimmy from the nose landing gear after landing. When he arrived at the hangar and inspected the nose wheel he discovered that a failed exhaust pipe had been directing hot gases onto the nose wheel assembly; causing a partial failure.

Narrative: After completing 2 touch and go landings; I landed and the nose wheel gave me an extremely hard shimmy. After the airplane came to a complete halt I taxied to the hangar without further shimmy and inspected the nose wheel. I found that one of the exhaust pipes had broken about 9' from the tip inside the cowling. The ensuing hot gasses were blowing directly on an H-Bracket in the nose wheel assembly weakening it causing it to partially fail. This partial failure caused the nose wheel not to track properly upon landing causing the extreme shimmy I felt. I contacted Ground Control and advised them of what happened in case the missing piece was still on the runway. Except for the extreme shimmy on landing I did not feel anything different in the airplane handling. I do remember the airplane had a slight shimmy during the previous touch and go landings; but nothing out of the ordinary.

Data retrieved from NASA's ASRS site as of July 2013 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.