82-17-03 SIKORSKY AIRCRAFT: Amendment 39-4437. Applies to Sikorsky Model S-76A helicopters, equipped with rotor brake systems, certificated in all categories.
Compliance is required as indicated, unless already accomplished. To prevent the possibility of fire due to a malfunctioning rotor brake, accomplish the following:
(a) Within the next 10 hours' time in service after the effective date of the AD on aircraft equipped with P/N 76363-09101-101 rotor brake:
(1) Prior to each flight whenever the rotor brake has previously been applied, inspect puck-to-disk clearance for .045 inch minimum at all 4 pucks.
(2) If the puck-to-disk clearance is less than .045 inch, remove rotor brake assembly and replace with a serviceable unit.
(b) Within the next 90 days after the effective date of the AD, unless already accomplished:
(1) Modify the No. 2 relay panel assembly in accordance with the Accomplishment Instructions, Paragraph 2, of Sikorsky Customer Service Bulletin No. 76-66-7, dated March 9, 1981, or FAA approved equivalent.
(2) Modify the brake installation by the addition of shield assemblies in accordance with the Accomplishment Instructions, Paragraph 2, of Sikorsky Customer Service Bulletin No. 76-66-8A, dated September 30, 1981, or FAA approved equivalent.
NOTE: After installation of the shield assemblies, the supplementary installation of an access door in the upper rotor brake shield, in accordance with Sikorsky Customer Service Notice No. 76-79, dated December 23, 1981, or later FAA approved revision, may be accomplished at the operator's option.
(3) Install a warning relay in accordance with the Accomplishment Instructions, Paragraph 2, of Sikorsky Customer Service Bulletin No. 76-66-10B, dated November 25, 1981, or FAA approved equivalent.
(4) Modify Sikorsky P/N 76363-09101-101 brake by the installation of torqueless grip adjusters, Goodyear P/N 9522164, in accordance with Sikorsky Customer Service Notice No. 76-51B, dated April 22, 1982, or FAA approved equivalent, and Customer Service Letter CSL-SPT-82-089, dated May 20, 1982, or FAA approved equivalent. Reassemble and test in accordance with Paragraph B and C of Sikorsky Customer Service Notice No. 76-51B, dated April 22, 1982, or FAA approved equivalent.
(c) After compliance with paragraph (b) of the AD, the inspection prescribed by paragraph (a)(1) above is no longer required.
(d) Equivalent means of compliance may be approved by the Chief, Boston Aircraft Certification Branch, Federal Aviation Administration, New England Region, 12 New England Executive Park, Burlington, Massachusetts 01803.
This amendment becomes effective August 23, 1982.