Airworthiness Directive · Amendment 39-10218 · Fokker Model F28 Mark 0100 Series Airplanes
Fokker Model F28 Mark 0100 Series Airplanes
Model F28 Mark 0100 series airplanes having the serial numbers specified in Table 1 of this AD; certificated in any category. Table 1.--Serial Numbers of Airplanes Subject to This AD 11244 through 11460, inclusive 11463 through 11469, inclusive 11471 11474 through 11483, inclusive 11489 through 11491, inclusive 11497 through 11499, inclusive 11501 11502 11504 11506 11507 11512 through 11515, inclusive 11517 11520
This amendment adopts a new airworthiness directive (AD), applicable to certain Fokker Model F28 Mark 0100 series airplanes, that requires repetitive inspections of certain flanges and finger strips at rib 5.0 of the vertical stabilizer to detect fatigue cracking, and repairs, if necessary. This amendment also requires modifications that would strengthen the torsion box at rib 5.0 and prevent fatigue cracking; one of these modifications constitutes terminating action for the repetitive inspections. This amendment is prompted by reports indicating that, during full-scale fatigue testing, cracking has been found on the vertical stabilizer of the test article. The actions specified by this AD are intended to detect and prevent fatigue cracking in the subject area, which, if not corrected, could reduce the structural integrity of the vertical stabilizer.
