Airworthiness Directive · Amendment 39-10051 · Fokker Model F28 Mark 0100 Series Airplanes
Fokker Model F28 Mark 0100 Series Airplanes
Superseded. A later AD replaced this one: AD 2008-22-14. Comply with the one in force.
Model F28 Mark 0100 series airplanes, as listed in Fokker Service Bulletin SBF100-27-069, dated January 1, 1996; certificated in any category.
This amendment adopts a new airworthiness directive (AD), applicable to certain Fokker Model F28 Mark 0100 series airplanes, that requires loosening certain nuts on the horizontal stabilizer control unit (HSCU) to reduce stress on bolts; a one-time inspection of certain bolts on the HSCU to detect cracking, and replacement, if necessary; application of corrosion protection to these bolts; and reassembly and reidentification of the modified HSCU. This amendment is prompted by reports indicating that stress corrosion, resulting from overtightening of nuts on these bolts, has caused some of these bolts to crack and fail. The actions specified by this AD are intended to prevent failure of these bolts because of stress corrosion cracking which, if not corrected, could lead to loss of control of the horizontal stabilizer and reduced controllability of the airplane.
