The 1986 Thunderbird TY-90 brochure cover featured TY-90 Serial Number 9044, sold new to Sapp Brothers Logging of
Alsea Oregon in 1985. As you can see it was mounted to a Skagit T-100 self-propelled tower which has been upgraded with the
big Anderson-Boling steering axles usually found on the T-110HD self-propelled units-- 8 steering tires on her.
Knuckle-joints were an ongoing problem with the Sculler steering axles on the standard T-100 SP units when used
with bigger and heavier slackline yarder hoists. in 1997 the machine sold to Phoenix Logging at Craig Alaska.