Document ID: chunk:federal_register_of_legislation:F2006B09612:body:0:p2
Version: federal_register_of_legislation:F2006B09612
Segment Type: other
Provision Reference: 
Character Range: 3057–4619

1992.

           Note 3: RLD BLA 93-009/3(A) refers.

           Note 4: Fokker Service Bulletins F100-32-070 and F100-32-073 refer.

 Compliance: 1. Within 3 months after the effective date of this AD.

2.    For wheel assemblies with less than 800 flight cycles, inspect before 900 flight cycles, or within 200 flight cycles or at the next tyre chance, whichever occurs first.

             For wheel assemblies with greater than 800 flight cycles, inspect within the next 100 flight cycles or at next tyre change, whichever occurs first.

             In both cases, reinspect no later than every 500 flight cycles or at each tyre change, whichever occurs first. Continue to inspect until Requirement 3 of this AD becomes effective.

3.    After the third inspection under Requirement 2 of this AD and before further flight after that inspection.

4.    At the next two tyre changes after being repaired in accordance with Requirement 3 of this AD. Thereafter at every Wheel Assembly overhaul.

           This Airworthiness Directive becomes effective on 22 April 1999.

           Background: Several F.28 Mk.0100 operators reported finding cracks and broken spokes on Main Wheel Assemblies P/N 5008131-4. Investigation revealed that the manufacturer of the wheels, ABS Corporation, had discontinued a shot-peening procedure which was part of the manufacturing process before April 1991. As a result, a number of units were produced which are prone to fretting and cracking, due to the lack of shot- peening of the assembly mating surfaces and bolt bosses.