Airworthiness Directive · Amendment 39-9762 · Fokker Model F28 Mark 0100 Series Airplanes
Fokker Model F28 Mark 0100 Series Airplanes
Model F28 Mark 0100 airplanes; having serial numbers 11244 through 11420 inclusive, 11422, 11424 through 11428 inclusive, 11432 through 11439 inclusive, and 11443 through 11445 inclusive; certificated in any category.
This amendment adopts a new airworthiness directive (AD), applicable to certain Fokker Model F28 Mark 0100 series airplanes, that requires inspections to detect cracking of the Hi-lok bolt holes in the main hinge fittings of the horizontal stabilizer, and repair, if necessary. The amendment also requires modification of the main hinge fitting, modification or replacement of rib connecting angles, and modification of ribs. This amendment is prompted by a report indicating that cracking was found in the main hinge fittings of the horizontal stabilizer during fatigue testing. The cracking was a result of higher- than-anticipated loads induced during operation of the thrust reverser. The actions specified by this AD are intended to prevent deterioration of the fatigue life of the main hinge fittings of the horizontal stabilizer and reduced structural integrity of the horizontal stabilizer due to higher induced loads.
