78-12-05 SIKORSKY: Amendment 39-3240 as amended by Amendment 39-3562.
Applies to Sikorsky Models S-61L, S-61N, S-61NM, and S-61A helicopters with fixed S-61L type landing gears. After the effective date of this AD, compliance is required as indicated below in accordance with the designated paragraphs of Section 2 of Sikorsky Service Bulletin No. 61B25-6C, dated March 8, 1978, or later FAA approved revisions.
1. Within the next 10 landings, remove from service all S6125-50312 series and S6125-50313 series fitting assemblies and replace them in accordance with Paragraph C.
2. Within 15 hours time in service, and thereafter at intervals not to exceed 15 hours time in service, inspect, and replace if cracked, fitting assemblies S6125-50333-1, S6125-50333- 2, S6125-50334-1, and S6125-50334-2 in accordance with Paragraph B.
3. Within 120 landings, and thereafter at intervals not to exceed 120 landings or 15 flight hours from the last inspection, whichever results in longest calendar interval, inspect, and replace if cracked, fitting assemblies S6125-50333-1, S6125-50333-2, S6125-50334-1, and S6125-50334-2 with 7,000 or more landings in accordance with Paragraph D.
NOTE: If the number of landings cannot be determined, the fitting assemblies shall be considered to have more than 7,000 landings.
4. Within 15 hours time in service, and thereafter at intervals not to exceed 15 hours time in service from the last inspection, inspect, and replace if cracked, fitting assemblies, P/Ns S6180-63151 series, S6180-63161 series, S6125-50314 series, S6125-50315 series, S6125-50317 series, and the attachment lugs of S6125-50304-1 and S6125-50304-2 cylinder assemblies in accordance with Paragraph E.
5. Within 10 landings, unless already accomplished, and thereafter at intervals not to exceed 400 landings from the last inspection, inspect, and replace if cracked, tube assemblies, P/Ns S6125-50310-3, S6125-50310-4, S6125-50311-6, and S6125-50311-7, with 1,100 or more landings in accordance with Paragraph F.
NOTE: If number of landings cannot be determined, fitting assemblies shall be considered to have more than 1,100 landings.
6. Within 10 landings, unless already accomplished, and thereafter at intervals not to exceed 1,200 landings from the last inspection, inspect, and replace if cracked, tube assemblies, P/Ns S6125-50310-3, S6125-50310-4, S6125-50311-6, and S6125-50311-7, with 2,300 or more landings in accordance with Paragraph G.
7. Within 50 landings, unless already accomplished, and thereafter at intervals not to exceed 670 landings from the last inspection, inspect, and replace if cracked, fitting assemblies, P/N S6180-63161 series, with 126,000 or more landings, in accordance with Paragraph H.
8. Daily or at 50 landing intervals, whichever comes first, inspect and replace if cracked, fitting assemblies, P/N S6180-63151 series, with 75,000 or more landings in accordance with Paragraph I.
9. Within50 landings after the effective date of this amendment, unless already accomplished, and thereafter at intervals not to exceed 2,000 landings from the last inspection, inspect and replace, if cracked, cylinder assemblies, P/Ns S6125-50304-1 and S6125-50304-2, with 45,000 or more landings in accordance with Paragraph J.
10. Within 50 landings after the effective date of this amendment, unless already accomplished, and thereafter at intervals not to exceed 2,000 landings from the last inspection, inspect and replace, if cracked, cylinder assemblies, P/Ns S6125-50304-1 and S6125-50304-2, with 98,000 or more landings in accordance with Paragraph K.
11. Within 50 landings, remove from service all main landing gear upper tube assemblies, P/Ns S6125-50338-1 and S6125-50338-2, and lower tube assemblies, P/Ns S6125- 50337-1 and S6125-50337-2, that have been in service for more than 32,000 landings.
NOTE: If the number of landings specified in Paragraphs 7, 8, 9, 10, and 11 above cannot be determined, an estimate of the number of landings based upon the past operation of the part may be made and submitted for approval to the Chief, Engineering and Manufacturing Branch, FAA, New England Region.
The manufacturer's specifications and procedures identified and described in this directive are incorporated herein and made a part hereof 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 Sikorsky Aircraft, Stratford, Connecticut 06602. These documents may also be examined at FAA, New England Region, 12 New England Executive Park, Burlington, Massachusetts 01803, and at FAA Headquarters, 800 Independence Avenue, S.W., Washington, D.C. A historical file on this AD which includes the incorporated material in full is maintained by the FAA at its Headquarters in Washington, D.C., and at the FAA, New England Region Headquarters, Burlington, Massachusetts.
This amendment supersedes AD 77-16-06, Amendment 39-2997.
Amendment 39-3240 became effective upon publication in the FEDERAL REGISTER.
This Amendment 39-3562 becomes effective upon publication in the FEDERAL REGISTER.