Airworthiness directives › 2013-25-13
AD 2013-25-13 Airworthiness Directives; Sikorsky Aircraft Corporation (Sikorsky) Helicopters
Applicability*9
This AD becomes effective February 25, 2014.
Compliance
(1) The Manager, Boston Aircraft Certification Office, FAA, may approve AMOCs for this AD. Send your proposal to: Michael Davison, Flight Test Engineer, Boston Aircraft Certification Office, Engine & Propeller Directorate, 12 New England Executive Park, Burlington, Massachusetts 01803; telephone (781) 238-7156; email michael.davison@faa.gov. (2) For operations conducted under a 14 CFR part 119 operating certificate or under 14 CFR part 91, subpart K, we suggest that you notify your principal inspector, or lacking a principal inspector, the manager of the local flight standards district office or certificate holding district office before operating any aircraft complying with this AD through an AMOC.
Required actions
Joint Aircraft Service Component (JASC) Code: 6220 Main Rotor Hub, 6230 Main Rotor Mast/Swashplate, 6320 Main Rotor Gearbox, 6310 Engine/Transmission Coupling, 6510 Tail Rotor Drive Shaft.
Unsafe condition
(1) Within 25 hours time-in-service (TIS): (i) Insert into the airworthiness limitation section of the maintenance manual or instructions for continued airworthiness the component life prorating formula in Section 1.1.3, Component Life Prorating, pages 1-25 and 1-26, of Sikorsky Technical Manual TM 1-70-23AW-2, Change 3, dated April 15, 2012. (ii) Using the service life limits in Table 1 to Paragraph (e) of this AD, apply the component life prorating formula and calculate the new life limit for each specified part. If the number of hours of a part is unknown, that part cannot be installed on a Sikorsky Model S-70, S-70A, or S-70C helicopter. Do not calculate a new life limit for the part where the Model SH-60 life limit is higher than the life limit on Models S-70, S-70A, and S-70C. Table 1 to Paragraph ( e ) P/N Part description S-70, S-70A, S-70C service life UH-60M service life SH-60B/F service life 38023-10374-041 Spindle and Liner Assembly 8,000 6,400 10,000 70070-10046-055 and -056 Main Rotor Hub 5,100 3,100 1 N/A 70102-08105-102 Main Rotor Spindle Nut 8,000 6,400 10,000 70102-08111-047 Main Rotor Control Horn 20,000/1,300 2 /2,500 2 10,000 1 N/A 70103-08112-041 and -047 Main Rotor Hub 5,100 3,100 1 N/A 70104-08001-044-045 Rotating Swashplate 11,000 4,600 9,600 70351-08186-043 Main Rotor Shaft Extension 14,000 4,900 16,000 70351-38110-043, -044, and -045 Main Rotor Gear Box Housing 11,000 4,000 9,000 70351-38131-042 Main Rotor Shaft 17,000 5,200 19,000 70358-06620-101 and -102 Output Bevel Gear and Shaft 5,000 1,800 1 N/A 70400-08115-043, -045, -046, and -047 Left Tie Rod Assembly 14,000 4,600 6,300 70400-08162-042 Forward Bellcrank Support Assembly 14,000/2,500 3 5,600 7,600 70400-08166-041 Lateral Servo Bellcrank 20,000 11,000 14,000 70410-06520-044 through -046 Tail Rotor Servo Assembly 15,000 11,000 1 N/A 1 There is no service life limit listed because the parts on Model SH-60B/F have a different P/N than the parts on Models S-70, S-70A, and S-70C. 2 For serial number (S/N) 32479930 through 324791859, with CAGE code 60078, the life limit is 1,300 hours TIS. For S/N A241-07543 through A241-07594, A241-07706 through A241-07755, A241-07768 through A241-07771, A241-07800 through A241-07831, R241-00101 through R241-00355, R241-00701 through R241-00966, and R241-01001 through R241-01166, the life limit is 2,500 hours TIS. 3 For S/N A-367-00001 through A367-00035, with CAGE code 78286, the life limit is 2,500 hours TIS. (iii) Record the newly-established life limit of each part on the part's component log card or equivalent record. (2) After establishing the new life limit, replace each part that has reached or exceeded its new life limit with an airworthy part before further flight. (3) Do not install the following parts on a Model S-70, S-70A, or S-70C helicopter if they have been previously installed on a Model UH-60M helicopter: (i) Bolt, self retaining, P/N 70103-08801-102; (ii) Bifilar, P/N 70107-08400-046; (iii) Aft Bellcrank, P/N 70400-08102-045; (iv) Aft Walking Beam Assembly, P/N 70400-08104-048; or (v) Close Tolerance Bolt, P/N 70400-26802-102 and -103.
Affected ADs
This AD defines the unsafe condition as a critical part remaining in service beyond its life limit due to previously being installed on a different helicopter model with higher usage and flight loads. This condition could result in fatigue failure of a critical part and subsequent loss of control of the helicopter.
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