AD 76-06-01

76-06-01 SIKORSKY AIRCRAFT: Amendment 39-2541. Applies to S-61L, S-61N, S- 61NM, S-61R, S-62A, S-64A, S-64E, S-64F helicopters certified in all categories, including Military CH-3C, HH-3C, CH-3E, HH-3E, CH-54B helicopters certificated in all categories and equipped with:

1. Model 66WAP200 hydraulic pumps, Serial Numbers 1080 through 1086, 2013, 2015, 2228, 2298, 2670, 2889, and all Serial Numbers with "DO-" prefix, except FAA approved New York Air Brake Company Serial Numbers DO-1 through DO-83.

2. Model 66WAN200 hydraulic pumps, Serial Numbers DO-2110, DO-2117, DO- 2163, DO-2165, DO-2222, DO-2227.

Compliance required as indicated.

To detect flaking chrome plating from the pistons of Model 66WAP200 hydraulic pump, Serial Numbers 1080 through 1086, 2013, 2015, 2228, 2298, 2670, 2889, and all Serial Numbers with "DO-" prefix, except FAA approved New York Air Brake Company Serial Numbers DO-1 through DO-83; and Model 66WAN200 hydraulic pump, Serial Numbers DO-2110, DO-2117, DO-2163, DO-2165, DO-2222, DO-2227, accomplish the following:

a. Before the first flight each day, inspect the filter and filter bowl on the primary, auxiliary, and utility hydraulic manifold for the presence of chrome plating flakes, in accordance with the applicable Maintenance Manual instructions. If flakes are found, remove all pumps, with serial numbers noted above, and replace with FAA approved pumps before further flight. Immediately after replacement of the pump, flush and inspect the hydraulic system in accordance with the applicable Maintenance Manual instructions.

NOTE: For the requirements regarding the listing of compliance with this AD in the helicopter's permanent maintenance record, see FAR 91.173.

b. Within the next 180 calendar days after the effective date of this AD, replace all pumps, with serial numbers noted above, with FAA approved New York Air Brake Company pumps.

c. Advise the FAA, Chief, Engineering and Manufacturing Branch, New EnglandRegion, 12 New England Executive Park, Burlington, Massachusetts 01803, of the serial numbers of unapproved pumps found, the registration and serial number of the helicopter on which they are installed, and the serial nubmers of the replacement pumps. (Reporting approved by the Office of Management and Budget under OMB No. 04-R0174.)

d. After complying with Paragraph (b) of this AD, the inspection required by Paragraph (a) may be discontinued.

This amendment becomes effective March 24, 1976.