Transport Canada has ordered Bombardier CRJ700, CRJ900 and CRJ1000 operators to modify slat components to prevent failure of a pin that could cause the related slat to break away.
The directive (CF-2013-31), which is effective Oct. 22, gives operators 6,000 flight hours or 30 months, whichever comes first, to replace locking plates with “an anti-migration assembly” on both the left-and right-wing No. 3 slats.
“It was discovered that for certain slat system jam-disconnect failure cases, the resulting slat skew could lead to failure of the eccentric pin at the slat track 3-3 attachment,” says Transport Canada. “If the pin migrates out of the attachment lugs, this could cause the No. 3 slat panels to disconnect from the wing.”
The directive is based on a Bombardier service information sent to operators in June.