Document ID: chunk:federal_register_of_legislation:F2006B09599:body:0:p2
Version: federal_register_of_legislation:F2006B09599
Segment Type: other
Provision Reference: 
Character Range: 2727–5313

inch or more deep, replace the transmission with a serviceable transmission having a large radius shaft fillet before further flight.

                 (d)     Replace transmission, part number 28-13101-1 or -1-R, or 28-13101-3 or -3- R with a serviceable transmission having a large radius shaft fillet.

           Note 1: Installing a serviceable transmission with a shaft, part number 28-13104-1 or -1-R, Revision K, L, M, N, P, R, or S, or part number 28-13140-1 or -1-R, is terminating action for the requirements of this Directive.

           Note 2: FAA AD 2002-08-03 Amdt 39-12710 refers.

 Compliance: 1. Before further flight after 28 August 2002, unless already accomplished.

              2.        Before further flight after 28 August 2002, unless already accomplished.

              3.        a. Before further flight after 28 August 2002, unless already accomplished.

                b.    Unless the initial inspection is already accomplished, before further flight after 28 August 2002. Thereafter at intervals not to exceed 25 hours time in
                service.

                c.    Unless the initial inspection is already accomplished, within 5 hours time in service after 28 August 2002. Thereafter at intervals not to exceed 100 hours time in service.

                d.    Unless already accomplished, within 300 hours time in service after 28 August 2002 or at the next overhaul, whichever occurs first.

           This Amendment becomes effective on 28 August 2002.

Enstrom F-28 Series Helicopters

 AD/ENST 28/9 Amdt 4 (continued)

           Background: Emergency FAA AD 76-17-08 required repetitive inspections of the shoulder radius of the main rotor shaft.

           Amendment 1 reduced the dye-penetrant inspection periods following further investigation by the manufacturer.

           Amendment 2 removed from service main rotor shafts not modified in accordance with SDB No. 0036.

           Amendment 3 was prompted by the failure of a shaft on a Model F-28A helicopter due to a fatigue crack. This Directive added models previously unaffected, which have a "small radius fillet" main rotor shaft installed.

           Amendment 4 is issued in response a new FAA AD which adds additional main rotor gearbox part numbers to the AD requirement.

           Amendment 3 of this Airworthiness Directive became effective on 28 November 2001.

 David Alan Villiers
 Delegate of the Civil Aviation Safety Authority 22 August 2002

 The above AD is notified in the Commonwealth of Australia Gazette on 28 August 2002.