99-01-08: Stage 7 through Stage 15 High-Pressure Compressor (HPC) Disks

99-01-08 Pratt & Whitney: Amendment 39-10975. Docket 98-ANE-77-AD. Applicability: Pratt & Whitney (PW) JT8D and JT3D series turbofan engines, with stage 7 through stage 15 high-pressure compressor (HPC) disks installed, identified by part number (P/N) and serial number (S/N) specified in Appendix 1. These engines are installed on but not limited to the following aircraft: Boeing 707, 727, and 737 series airplanes and McDonnell Douglas DC-8, DC-9, and MD-80 series airplanes. Appendix 1 Disk Part Number and Serial Number (Sorted By Disk Part Number) Stage Disk Part Number Disk Serial Number 7 701407 7A7271 7 701507 4Z2030, 4Z2122, 8Z6454 7 766007 8B5265 7 774407 B207AA0307, B207AA0350, B207AA0379, B207AA0578, B207AA0643, BENCAH1353, BENCAH2320, BENCAH2327, BENCAH2851, BENCAH4091, BENCAJ8414, BENCAJ8440, BENCAK1631, BENCAK1684,BENCAK5135, BENCAK6623, BENCAK6643, BENCAK8115, H19093, H19026, H29904, J17128, J17407, J39120, J72011, J72132, K20050, K20167, K78491, L72139, M15364, M15368, M77985, M83784, M93463, N14127, N14190, N14213, N24114, N23978, N24091, N37879, N37919, N70390, N88161, N88195, N88335, N88342, N94974, N95036, P14716, P14741, P35486, P54563, P60347, P60394, P60446, P70328, P81247, P81253, P81392, P81399, P86295, P86311, R03089, R12413, R12418, R12549, R12557, R19365, R31290, R31411, R37414, R37520, R37554, R46834, R46893, R46918, R46943, R47019, R72171, R72257, S05566, S05610, S05659, S10014, S10050, S13885, S13910, S14048, S14063, S14088, S14173, S36633, S36810, S36857, S37128, S37149, S37168, S37187, S37312, S37367, S37389, S37420, S37469, S37498, T04409, T04526, T04566, T04615, T04632, T04898, T04899, T04988, T05055, T05106 7 5006007-01 B207AA0068, B207AA0693, BENCAH0061, BENCAH3134, BENCAJ8558, BENCAJ8594, BENCAL0749, BENCAL2650, R54586, R79450, S11202, S11206, S57118, S57216, S57519 7 5006007-02 BENCAK9643, BENCAK9690, BENCAK9697, BENCAK9705, BENCAK9723, BENCAL3657, BENCAL5478 7 774407 BENCAH0521, BENCAJ8454, R57626, T04885 8 738308 9B1363, H03990 8 748608 7A9608, 7B9489, 8B0397, B208AA0030, B208AA0045, B208AA0070, BENCAJ8185, G30014, G62624, G63907, H29599, H35085, H64390, H84992, H86520, J29857, J29958, J57418, J57426, J57469, J57532, J57660, J57663, J94763, J94815, M54646, M54770, M54821, M54843, N14562, N14765, N84308, N84314, N84317, N84319, N84373, N84418, P26025, P26136, P26153, P26171, P28471, P28530, P28534, P28564, P28596, P28607, P83853, P94736, P98927, R18995, R46153, R73850, S01136, S01153, S01185, S50692, S50748, S78016, S78066, S78128 8 787008 K51696, K52389, L61543, M76852, M77423, M77749, M77791, N33354, N33408, N33702, N33760, N89060, N89386, N90133, N90152 8 787008F N89050 8 787208 B228AA0194, B228AA0343, B228AA0371, B228AA0540, B228AA0574, B228AA0605, BENCAH4505, BENCAH5428, BENCAH5435, BENCAJ5724, BENCAK0065, BENCAK0066, BENCAK6165, BENCAK6359, BENCAK8796, BENCAK9253, BENCAL1567, BENCAL1571, BENCAL1579, BENCAL1887, BENCAL3339 ,BENCAL5283,BENCAM0672, J47026, K12730, N06609, N89709, P43644, P43665, P43897, P43936, P43950, P43954, P44141, P44694, P45378, P45593, R23192, R23234, R23450, R23452, R23569, R23837, R24172, R24201, R24205, R24390, R24599, R24827, R91709, S07732, S39110, S39281, S39337, S39409, S39410, S39487, S39509, S39534, S39633, S39676, S39721, S39942, S39963, S39996, S40033, S40041 8 788608 H36177 8 788708 7A2254 8 789508 G51990 8 789608 J46995 8 792038 B228AA0331, B228AA0511, B228AA1005, BENCAJ8854, BENCAJ8871 8 796348 K53240 8 797938 BENCAL2605 8 5005808-01 B228AA0901, BENCAJ1138, BENCAJ8902, S70327 9 628209 5X8746 9 701509 8Z5256, 9A6145, H86825, J00245, J25666, J87515, J89031, K34309, K35061, K55559, K85824, L31209, L31751, L55770, M10469, M40027, M49712, M61566, M84762, M86342, M86842, M86844, N02758, N02994, N209AA0006, N209AA0080, N209AA0091, N209AA0094, N209AA0255, N209AA0339, N209AA0352, N209AA0561, N21068, N21507, N21508, N22475, N22570, N22591, N41297, N42662, N57120, N79874, N79893, N81317, N97653, NENCAH0017, NENCAH0187, NENCAH0192, NENCAH0222, NENCAH0269, NENCAH0280, NENCAH0337, NENCAH0422, NENCAH0445, NENCAH0451, NENCAH0593, NENCAH0737, NENCAH0757, NENCAH0913, NENCAH0920, NENCAH1014, NENCAH1227, NENCAH1357, NENCAH1430, P11360, P11370, P11443, P11450, P12878, P51572, P52444, P52971, P53248, P77028, P77207, P78457, P97645, P98143, P98661, P98961, P98991, R17442, R18113, R45676, R46466, R72941, R73009, R73013, R73420, R73464, R73467, R73804, R73934, S00689, S00741, S00777, S00798, S18975, S19201, S50490, S77602, S77616, S77651 9 739509 G79836 9 772509 H49185, K56788, P97497, R73983, S01209, S50832 9 798509 B209AA0539, BENCAH3770, BENCAJ9383, BENCAK9880, BENCAL0717, BENCAL0703, BENCAL2372, BENCAL6305 9 701509 BENCAH0448 9 701509N R18236 9 772509 K23767 9 798509 BENCAJ9360, P53159 10 701410 7Z0800, 7Z0806 10 701810 0A0377, 3B8966, 3B9144, 9Z9847, A00862, H39339, H60642, R22292 10 701810G G82663 10770510 4B4921, G80187 10 772510 B210AA0014, B210AA0202, B210AA0273, B210AA0637, B210AA0640, B210AA0749, B210AA0752, B210AA0429, BENCAH0251, BENCAH1404, BENCAJ9735, BENCAJ9784, BENCAJ9868, BENCAK5318, BENCAK5762, BENCAK5946, BENCAK9105, BENCAL0388, BENCAL1598, BENCAL1601, BENCAL2427, BENCAL4455, BENCAL5993, H34395, H58784, J23708, J68609, J87953, J88767, K03190, K03586, K24796, K25271, K35625, K55848, K66100, K68068, K85468, L15000, L56873, L84428, L86007, M10049, M10613, M39974, M56263, M61659, M84606, M87097, N03907, N02538, N02778, N03133, N21767, N22275, N41185, N41208, N41484, N41613, N42094, N42143, N42187, N42838, N57150, N57830, N57862, N80227, N80661, N80671, N81136, N81150, N81454, N81456, P11024, P11818, P11869, P12016, P12811, P51804, P51873, P52670, P53019, P53213, P76639, P77620, P77862, P78050, P97278, P98630, R17507, R18502, R18520, R44856, R44861, R44864, R45159, R46345, R72614, R72630, R72884, R73138, R73408, R73612, R73617, R73862, S01349, S01364, S01365, S01406, S01463, S01486, S19301, S19305, S19487, S19630, S50981, S51203, S70220, S78451, S78492, S78780, T18947, T19138, T19153, T49020, BENCAJ9732, N81125, S70249 11 701411 2B3335, 6Y6265, 6Y7124, 9Y4723 11 701811 A03782, G33309, H24029, J28340 11 701811D 5A8129 11 772511 B211AA0058, B211AA0106, B211AA0119, B211AA0240, B211AA0621, B211AA0744, B211AA0944, B211AA1224, B211AA1227, BENCAH4040, BENCAK0466, BENCAK7376, BENCAK7377, BENCAK7378, BENCAK7391, BENCAK7432, BENCAK7436, BENCAK7449, BENCAK7493, BENCAK7517, BENCAL2882, BENCAL2903, BENCAL3047, BENCAL3107, J23871, J60159, J60844, J88645, K23851, K25421, K34786, K35678, K56219, K86641, L30533, L31909, L84584, L85406, LI4848, M39922, M40288, M49491, M61348, M73855, M86390, N21317, N02565, N02849, N03254, N03566, N03749, N03884, N21373, N21747, N22005, N22023, N22361, N22749, N41265, N41900, N42762, N56596, N57211, N57249, N57915, N98569, N98918, N99538, P10980, P11984, P12374, P12389, P12900, P51911, P52733, P53057, P66436, P77051, P77157, P77977, P78064, P78528, P78566, R05712, R18713, R29689, R29849, R29855, R29858, R29957, R30079, R30091, R30098, R30396, R30540, R30753, R30778, R31032, R44897, R45822, R46094, R46488, S03919, S03920, S04110, S04209, S04340, S04487, S04565, S04576, S04601, S04625, S80671, S80726, S80801, S80817, S80830, T22255, T22427, T22430, T22433, T22695, T22711, T23028, B211AA0681, N97343 11 772511H S03892 11 772511M B211AA0066, B211AA0584 12 414212HC 5L5355 12 701412 1Z5717, 5Y5915 12 701812 1Z7175, 3A3910, A02080, H62635, N28026 12 701812D G93483 12 717312 2B3418, G15036, G29488, G63557 12 769312 1Z5153 12 772512 H34015, H77074, J24654, J38490, J59514, K02314, K24837, K55637, K55648, K86189, L15523, L30268, L30307, L31553, L56280, L56328, L84937, L86244, M86432, M10163, M10415, M10948, M11260, M11282, M40263, M48887, M49046, M49595, M61285, M61856, M61955, M84903, M86222, N02391, N02431, N02488, N03222, N03686, N22344, N22883, N41245, N41249, N41463, N57445, N57460, N58065, N58102, N58109, N58117, N80256, N81365, N97115, N97124, N97457, N98208, N98222, N99001, N99066, P11199, P12270, P12312, P51405, P51433, P51437, P52633, P53139, P53173, P77109, P77978, P78005, P78202, P97472, P98163, P98509, P98706, P98876, R17547, R18000, R18009, R18395, R18404, R19046, R19047, R45120, R45947, R46042, R46055, R73153, R73459, R73782, R74102, R74120, R74356, R74528, S01701, S01720, S01963, S02019, S51348, S51376, S51391, S51490, S51499, S51540, S51542, S78919, S78924 12 798512 B212AA0948, B212AA0032, B212AA0209, B212AA0234, B212AA0255, B212AA0276, B212AA0283, B212AA0436, B212AA0439, B212AA0442, B212AA0497, B212AA0739, B212AA0788, B212AA0808, B212AA0826, B212AA1042, BENCAH1745, BENCAH2182, BENCAJ9560, BENCAJ9619, BENCAJ9680, BENCAK8619, BENCAK9455, BENCAL0437, BENCAL0445, BENCAL0446, BENCAL0450, BENCAL2451, BENCAL2462, BENCAL5111, BENCAL6030, R46125, S94444, S94463, S94550, T19384, T28481, T28560,T28581, T43085 12 772512 N97437 12 772512G S02004 12 798512 BENCAJ9509, BENCAL2313, BENCAL6575 13 701813 9B6665, G92924, H10764, H63434, H63596 13 701813E H40915 13 762413 T02660 14 750414 H91643, H92945, N68876, P95479, T39660 15 750115 H530181 15 750415 J35404, S97819 Note 1: This airworthiness directive (AD) applies to each engine identified in the preceding applicability provision, regardless of whether it has been modified, altered, or repaired in the area subject to the requirements of this AD. For engines that have been modified, altered, or repaired so that the performance of the requirements of this AD is affected, the owner/operator must request approval for an alternative method of compliance in accordance with paragraph (b) of this AD. The request should include an assessment of the effect of the modification, alteration, or repair on the unsafe condition addressed by this AD; and, if the unsafe condition has not been eliminated, the request should include specific proposed actions to address it. Compliance: Required as indicated, unless accomplished previously. To prevent the failure of a high-pressure compressor disk due to Cadmium embrittlement, resulting in uncontained engine failure and damage to the airplane, accomplish the following: (a) Remove from service stage 7 through stage 15 high-pressure compressor (HPC) disks identified in Appendix 1 of this AD as follows: (1) For disks with less than 250 hours time in service (TIS) since last NiCd plating, remove disk and replace with a serviceable part within 100 hours TIS after the effective date of this AD. (2) For disks with greater than or equal to 250 hours and less than 500 hours TIS since last NiCd plating, remove disk and replace with a serviceable part within 150 hours TIS after the effective date of this AD. (3) For disks with greater than or equal to 500 hours TIS since last NiCd plating no action is required. (4) Disks removed from service in accordance withthis AD are not eligible for installation in any engine. (b) An alternative method of compliance or adjustment of the compliance time that provides an acceptable level of safety may be used if approved by the Manager, Engine Certification Office. Operators shall submit their requests through an appropriate FAA Principal Maintenance Inspector, who may add comments and then send it to the Manager, Engine Certification Office. Note 2: Information concerning the existence of approved alternative methods of compliance with this airworthiness directive, if any, may be obtained from the Engine Certification Office. (c) Special flight permits may be issued in accordance with sections 21.197 and 21.199 of the Federal Aviation Regulations (14 CFR 21.197 and 21.199) to operate the aircraft to a location where the record search requirements of this AD can be accomplished. (d) This amendment becomes effective on January 5, 1999.