Page 13 - Volume 12 Number 6

Photo A: Blown Tire
Photo B: The intact stationary disc. Notice the lugs fitting into receptacles in the brake caliper housing.
Photo C: One of the stationary discs pieced back together with what was left after the brakes were removed. Notice the three mangled lugs on the inside; one is
missing completely.
Photo D: A close-up of a damaged lug receptacle due to the extreme heat, which dislodged the steel lugs.
cooling slot. As the heat intensified, the pad material began to break down and melt. Most of the cooling slots in the rotating discs were filled with this gunk.
JUNE 2018
Check out the heavy gouging in photo F; once the stationary discs broke into pieces, their lugs cut into the caliper housings. This was the worst-case scenario – these brakes had no redeemable cores whatsoever.
And the wheels? All bad. When the stationary discs broke up, the centrifugal force pushed the pieces against the wheel halves and their
outer edges dug in (photo G). As for the R/H outboard wheel, the long taxi back at high idle on a mangled tire followed by a plunge into the gravel median took its toll.
If the brakes were engaged, or partially engaged, the whole time, I was asked why they failed at the taxiway turn. I’m sure the system was overheated so severely that the O-rings melted.
Photo E: The cooling slots in the rotating discs were filled with gunk, like the one circled above.
KING AIR MAGAZINE • 11