PA-28 flight instructor reported a loss of control and runway excursion after landing due to left ma...

Attributes
ACN	1578325
Time
Date	201809
Local Time Of Day	1201-1800
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	VMC
Aircraft 1
Make Model Name	PA-28 Cherokee/Archer/Dakota/Pillan/Warrior
Operating Under FAR Part	Part 91
Flight Phase	Landing
Component
Aircraft Component	Main Gear
Person 1
Function	Instructor
Qualification	Flight Crew Instrument Flight Crew Flight Instructor Flight Crew Commercial Flight Crew Multiengine
Experience	Flight Crew Last 90 Days 200 Flight Crew Total 1700 Flight Crew Type 800
Events
Anomaly	Aircraft Equipment Problem Less Severe Deviation - Procedural Published Material / Policy Ground Event / Encounter Loss Of Aircraft Control Ground Excursion Runway

Narrative:

On rollout from landing; the student and I experienced directional control difficulties that led to the airplane exiting runway 21 on the south side by a few feet. We stopped the airplane and shutdown to inspect the possible damage. The top of the torque link on the left main gear had come apart from its attachment resulting in a counterclockwise twisting of the left main landing gear that caused the airplane to lose control on rollout and yaw to the left. No side loading or unsafe touchdown occurred during the touchdown prior to the incident. Future preflights will consist of examining the torque link attachments with greater scrutiny.

Original NASA ASRS Text

Title: PA-28 flight instructor reported a loss of control and runway excursion after landing due to left main gear torque link issue.

Narrative: On rollout from landing; the student and I experienced directional control difficulties that led to the airplane exiting Runway 21 on the south side by a few feet. We stopped the airplane and shutdown to inspect the possible damage. The top of the torque link on the left main gear had come apart from its attachment resulting in a counterclockwise twisting of the left main landing gear that caused the airplane to lose control on rollout and yaw to the left. No side loading or unsafe touchdown occurred during the touchdown prior to the incident. Future preflights will consist of examining the torque link attachments with greater scrutiny.

Data retrieved from NASA's ASRS site 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.