Airworthiness Directive · Amendment 39-11720 · Fokker Model F.28 Mark 0070 Series Airplanes
Fokker Model F.28 Mark 0070 Series Airplanes
Superseded. A later AD replaced this one: AD 2004-13-17. Comply with the one in force.
Model F.28 Mark 0070 airplanes, serial numbers 11565 and 11569; 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 certain Fokker Model F.28 Mark 0070 series airplanes. This action requires a one-time inspection to detect loose bolts attaching the gustlock counter-bracket to the pulley on the elevator tension regulator assembly, and corrective action, if necessary. This amendment is prompted by issuance of mandatory continuing airworthiness information by a foreign civil airworthiness authority. The actions specified in this AD are intended to prevent restricted elevator movement and consequent reduced controllability of the airplane.
To prevent restricted elevator movement and consequent reduced controllability of the airplane, accomplish the following:
(a) Within 2 months after the effective date of this AD, perform a one-time general visual inspection of the elevator gustlock counter-bracket of the elevator tension regulator assembly to detect any discrepancy (including improper installation, loose bolts, sealant damage or an insufficient amount of sealant, and incorrect torque values of the bolts or nuts), in accordance with the Accomplishment Instructions of Fokker Service Bulletin SBF100-27-076, dated July 1, 1999.
(1) If no discrepancy is detected, no further action is required by this AD.
(2) If any discrepancy is detected, prior to further flight, accomplish the applicable corrective actions [removing the sealant (if present) from the bolt head and nut and checking the torque value of the bolt and nut; replacing any discrepant bolt, washer, or nut with a new component; ensuring specified torque values; and applying sealant to the bolt head and nut to prevent corrosion], in accordance with the service bulletin.
Note 2: For the purposes of this AD, a general visual inspection is defined as: “A visual examination of an interior or exterior area, installation, or assembly to detect obvious damage, failure, or irregularity. This level of inspection is made under normally available lighting conditions such as daylight, hangar lighting, flashlight, or drop-light, and may require removal or opening of access panels or doors. Stands, ladders, or platforms may be required to gain proximity to the area being checked.”
