AD 77-07-11 ACTIVE

77-07-11 PRATT & WHITNEY AIRCRAFT: Amendment 39-2872. Applies to Pratt & Whitney Aircraft JT8D-9 and -9A turbofan engine models with the following serial numbers:

665158, 665161, 665165, 665169, 665179, 665180, 665181, 665194, 665197, 665201, 665202, 665207, 665208, 665213, 665215, 665216, 665218, 665220, 665221, 665231, 665244, 665246, 665252, 665254, 665258, 665279, 665282, 665283, 665285, 665288, 665303, 665304, 665311, 665312, 665315, 665317, 665318, 665321, 665323, 665328, 665329, 665331, 665335, 665336, 665338, 665340, 665345, 665358, 665364, 665370, 665375, 665377, 665380, 665381, 665384, 665386, 665388, 665389, 665392, 665393, 665402, 665406, 665408, 665410, 665416, 665417, 665418, 665421, 665429, 665434, 665436, 665437, 665438, 665440, 665441, 665442, 665443, 665448, 665455, 665459, 665463, 665467, 665468, 665481, 665489, 665519, 665520, 665521, 665528, 665529, 665531, 665532, 665533, 665536, 665538, 665547, 665548, 665549, 665551, 665552, 665560, 665562, 665563, 665630, 665631, 665636, 665637, 665659, 665661, 665662, 665663, 665664, 665665, 665666, 665667, 665668, 665681, 665682, 665683, 666789, 666803, 666807, 666810, 666838, 666882, 666884, 666892, 666901, 666913, 674162, 674344, 674399, 674401, 674250, 674262, 674266, 674314, 674325, 674333, 674335, 674354, 674355, 674359, 674361, 674374, 674376, 674379, 674380, 674384, 674391, 674400, 674404, 674422, 674482, 674487, 674489

Compliance required as indicated prior to the accumulation of 6000 hours time in service after February 20, 1975, unless already accomplished.

To preclude interference between the fourth stage turbine stator and rotor as a result of possible intermixing of different material stators, inspect for and replace all fourth stage stator vanes not FAA approved for that engine model.

This supersedes Amendment 39-1835, AD 74-10-12, as amended by Amendment 39-2088.

This Amendment becomes effective April 15, 1977.