| AD Number | 81-06-53 R1 | Status | Active |
| Effective Date | February 18, 1982 | Issue Date | Not specified |
| Docket Number | Unknown | Amendment | 39-4303 |
| Product Type | ["Aircraft"] | Product Subtype | ["Rotorcraft"] |
| CFR Part | --- - Part 39 | CFR Section | N/A |
| Citation | This information is not available. | ||
| Manufacturer(s) | Sikorsky Aircraft Corporation |
| Model(s) | S62A |
81-06-53 R1 SIKORSKY AIRCRAFT DIVISION: Amendment 39-4124 as amended by Amendment 39-4303. Applies to S-62 series helicopters, certificated in all categories, equipped with P/N S6235-20213 (Goodyear 9430301) or P/N S62350-22013-101 (Goodyear 4000277) rotor brakes discs.
Compliance required as indicated, unless previously accomplished.
A. To prevent operation with cracked rotor brake discs, accomplish the following:
(1) Prior to the next flight and prior to the first flight of each day thereafter, visually inspect the P/N S6235-20213 (Goodyear 9430301) rotor brake disc for cracks in accordance with Paragraph E(1) of Sikorsky Alert Service Bulletin 62B35-12.
(2) Within the next 10 flight hours, and every 120 flight hours thereafter, do a detailed inspection of the P/N S6235-20213 (Goodyear 9430301) rotor brake disc installation and a dye penetrant inspection of the P/N S6235-20213 (Goodyear 9430301) rotor brake disc for possible cracks, in accordance with Paragraph E(2) of Sikorsky Alert Service Bulletin 62B35-12.
(3) Not later than July 31, 1982, replace P/N S6235-20213 (Goodyear 9430301) rotor brake disc with P/N 62350-22013-101 (Goodyear 4000277) rotor brake disc in accordance with Paragraph 2 of Sikorsky Service Bulletin 62B35-13.
(4) Upon completion of the requirements of Paragraph A(3), the inspections required by Paragraph A(1) may be discontinued.
(5) Prior to the accumulation of 120 flight hours since new or the last inspection, or within the next 10 flight hours, whichever occurs later, do a detailed inspection of the P/N 62350-22013-101 (Goodyear 4000277) rotor brake disc installation and a dye penetrant inspection of the rotor brake disc for possible cracks, in accordance with Paragraph E(2) of Sikorsky Alert Service Bulletin 62B35-12, except that the minimum thickness for the new disc is .449 inches and the attachment bolt torque is changed per Figures 1 and 2 of Sikorsky Service Bulletin 62B35-13. Thereafter,inspect at intervals not to exceed 120 flight hours.
(6) If crack indications exist, replace the disc in accordance with the applicable Sikorsky S-62 Maintenance Manual, and resume inspections as required in Paragraph A(5) above.
B. To prevent grounding of helicopters due to nonavailability of serviceable rotor brake discs, the rotor brake system may be temporarily deactivated as follows:
(1) Remove rotor brake cylinder (with bracket) and disc from main gearbox per applicable Sikorsky S-62 Maintenance Manual. Cap and clamp lines.
(2) Placard cockpit to indicate that rotor brake system is not operational.
(3) Rotor brake systems may be reactivated, as soon as serviceable discs are available, by reinstalling cylinder, bracket, and disc in accordance with the applicable Sikorsky S- 62 Maintenance Manual. Remove placard from cockpit, and resume inspections as required by Paragraph A(1), A(2) and A(S), above, as applicable.
C. Report within 24 hours anydiscrepancies found to the Chief, Engineering and Manufacturing Branch, Federal Aviation Administration, New England Region, 12 New England Executive Park, Burlington, Massachusetts 01803.
D. Upon request of the operator, an equivalent means of compliance with the requirements of this AD may be approved by the Chief, Engineering and Manufacturing Branch, FAA, New England Region. Reporting approved by the Office of Management and Budget under OMB No. 04-R0174.
NOTE: Sikorsky Alert Service Bulletin No. 62B35-12, dated March 12, 1981, applies to this AD.
The manufacturer's Alert Service Bulletin and Maintenance Manual identified and described in this directive are incorporated herein and made a part thereof pursuant to 5 U.S.C. 552(a)(1).
All persons affected by this directive who have not already received these documents from the manufacturer may obtain copies upon request to Manager, Technical Services, Commercial Customer Service, Sikorsky Aircraft Division, North Main Street, Stratford, Connecticut 06602. These documents may also be examined at Federal Aviation Administration, New England Region, 12 New England Executive Park, Burlington, Massachusetts 01803, and FAA Headquarters, 800 Independence Avenue, S.W., Washington, D.C. 20591.
Amendment 39-4124 became effective upon publication in the Federal Register except for recipients of the Emergency AD, dated March 16, 1981, for whom it became effective upon receipt.
This amendment 39-4303 becomes effective February 18, 1982.