Airworthiness Directive · Amendment 39-11679 · Fokker Model F.28 Mark 0070 and 0100 Series Airplanes
Fokker Model F.28 Mark 0070 and 0100 Series Airplanes
All Model F.28 Mark 0070 and 0100 airplanes, certificated in any category.
Note 1: This AD applies to each airplane identified in the preceding applicability provision, regardless of whether it has been modified, altered, or repaired in the area subject to the requirements of this AD. For airplanes that have been modified, altered, or repaired so that the performance of the requirements of this AD is affected, the owner/operator must request approval for an alternative method of compliance in accordance with paragraph (b) of this AD. The request should include an assessment of the effect of the modification, alteration, or repair on the unsafe condition addressed by this AD; and, if the unsafe condition has not been eliminated, the request should include specific proposed actions to address it.
This amendment adopts a new airworthiness directive (AD), applicable to all Fokker Model F.28 Mark 0070 and 0100 series airplanes, that requires installation of new, improved bonding jumpers on the horizontal stabilizer. This amendment is prompted by issuance of mandatory continuing airworthiness information by a foreign civil airworthiness authority. The actions specified by this AD are intended to ensure adequate electrical bonding between the horizontal and vertical stabilizers. Inadequate electrical bonding, in the event of a lightning strike, could cause electrical arcing, and result in damage to the hydraulic lines and consequent failure of the hydraulic systems.
To ensure adequate electrical bonding between the horizontal and vertical stabilizers, accomplish the following:
(a) Within 18 months after the effective date of this AD, accomplish the actions required by paragraphs (a)(1) and (a)(2) of this AD, in accordance with the Accomplishment Instructions of Fokker Service Bulletin SBF100-23-032, dated September 22, 1999.
(1) On the left-hand side of the horizontal stabilizer, replace the existing bonding jumper on the horizontal stabilizer torsion box with a new, improved bonding jumper.
(2) On the right-hand side of the horizontal stabilizer, install a new, improved bonding jumper.
Note 2: Fokker Service Bulletin SBF100-23-032, dated September 22, 1999, references Fokker 70/100 Aircraft Maintenance Manual (AMM), Chapter 20-13-05, as an additional source of service information to accomplish the installation of the new bonding jumpers.
