Document ID: chunk:federal_register_of_legislation:F2017L00863:body:0:p1
Version: federal_register_of_legislation:F2017L00863
Segment Type: other
Provision Reference: 
Character Range: 0–3317

AIRWORTHINESS DIRECTIVE
On the commencement date specified below, and for the reasons set out in the background section, the CASA delegate whose signature appears below repeals Airworthiness Directive (AD) AD/ELECT/42 Amdt 1 and issues the following AD under subregulation 39.001 (1) of CASR 1998 and subsection 33 (3) of the Acts Interpretation Act 1901. The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct an unsafe condition) be taken in relation to the aircraft or aeronautical product mentioned in the applicability section: (a) in the circumstances mentioned in the requirement section; and (b) in accordance with the instructions set out in the requirement section; and (c) at the time mentioned in the compliance section.

Electrical Equipment Miscellaneous (including Magnetos)
AD/ELECT/42 Amdt 2  Bendix Impulse Couplings  13/2017

Applicability:  All Bendix Magnetos with type designations:
                   S4LN-21/1225/1227  S4RN-21/1225/1227
                   S6LN-21/23/25/1225/1227 S6RN-21/23/25/1225/1227
                   S4LN-200 P/N 10-163005-7 D-2021/2031,
                   D-3000 (all)

                   Except Bendix Blue Label Impulse Coupled Magnetos Serial Number 8236001 and above, or Bendix Red Label Impulse Coupled Magnetos with the following Serial Numbers and above:

                               S-20 Series: B-001171 or A297043;
                               S-200 Series: B-001732 or A297043;
                               S-1200 Series: B-001162 or A297043;
                               D-2000 Series: 35550;
                               D-3000 Series: B-000249 or 5806.
Requirement:    For all applicable impulse couplings having less than 300 operating hours -
                   1. Remove magneto from the engine in accordance with engine/aircraft manufacturers published instructions;
                   2. Place the magneto in a suitable work stand with the impulse coupling facing up;
                   3. Use finger pressure to push inward on the toe of each flyweight so that the flyweight heel protrudes outward;
                   4. Using a fine number 1 double cut 1/2 inch wide file at least 3/32 inch thick pass the file across the heel of the flyweight attempting to remove material. If the flyweight has been properly heat treated the file will glide smoothly over the heel of the flyweight removing no material. If the flyweight is not properly heat treated (soft) the file will not glide easily across the surface of the flyweight heel and material will be removed;

      5. If an improperly heat treated (soft) flyweight is found, immediately remove and replace the cam assembly and/or the impulse coupling assembly with an assembly meeting the requirement of this AD, following procedures in the Magneto Overhaul Instructions and paying strict attention to Notes and Cautions in those Instructions;
      6. Inspect the impulse coupling stop pins for wear and replace as necessary;
      7. After flyweights have been identified, stop pins inspected, and the impulse coupling reinstalled on the magneto; if the magneto was removed; identify the magneto by stamping a 1/16 inch letter F in the upper right corner of the identification plate to indicate that this