EASA AD No.: 2010-0213

EASA Form 110 Page 1/3 

## EASA AIRWORTHINESS DIRECTIVE

AD No.: 2010-0213 [Corrected: 03 December 2010]

Date: 14 October 2010

Note: This Airworthiness Directive (AD) is issued by EASA, acting in accordance with Regulation (EC) No 216/2008 on behalf of the European Community, its Member States and of the European third countries that participate in th e activities of EASA under Article 66 of that Regulation.

This AD is issued in accordance with EC 1702/2003, Part 21A .3B. In accordance with EC 2042/2003 Annex I, Part M.A.301, the continuing airworthiness of an aircraft shall be ensured by accomplishing any applicable ADs. Consequently, no person may opera te an aircraft to which an AD applies, except in accordance with t he requirements of that AD, unless otherwise specified by the Ag ency [EC 2042/2003 Annex I, Part M.A.303] or agreed with the Authority of the State of Registry [EC 216/2008, Article 14(4) exemptio n].



### Type Approval Holder’s Name :

Eurocopter Deutschland GmbH Type/Model designation(s) :

EC 135 and EC 635 helicopters

TCDS Number : EASA.R.009

Foreign AD : Not applicable

Supersedure : None



### ATA 63 Main Rotor Drive – Main Transmission Housing Upper Part – Modification

Manufacturer(s): Eurocopter Deutschland GmbH (ECD), Eurocopter España S.A.

Applicability: EC 135 P1(CDS), EC 135 P1 (CPDS), EC 135 P2(CPDS), EC 135 P2+, EC 135 T1(CDS), EC 135 T1(CPDS) , EC 135 T2(CPDS), EC 135 T2+, EC 635 T1(CPDS), EC 635 P2+ and EC 635 T2+ helicopters, all serial numbers, if equipped with a Main Transmission FS108 housing upper part, Part Number (P/N) 4649 301 034.

Reason: A recent inspection has shown that, on some of the housing upper parts for the main transmission FS108, the bypas s inlet in the oil filter area has not been manufactured in accordance with the applicable design specifications.

This condition, if not corrected, could adversely affect the oil-filter bypass function, which is essential for continued safe flight.

For the reason described above, this AD requires a temporary modification of each affected P/N 4649 301 034 main transmission upper part by installing a corrugated washer, which will establish an equivalent structural design for the oil supply to the bypass. This AD also requires rework of the oil filter area to bring the affected parts (back) within the applicable design specifications.
This AD has been republished to remove a part serial number (1028) from Appendix 1 of this AD and to correct paragraphs (2) and (3) for consistency.

Effective Date: 28 October 2010EASA AD No.: 2010-0213

EASA Form 110 Page 2/3 Required Action(s) and Compliance Time(s): Required as indicated, unless accomplished previously:
(1) Within 3 months after the effective date of this AD, identify the serial number (s/n) of the P/N 4649 301 034 main transmission upper part installed on the helicopter and, if the s/ n is listed in Appendix 1 of this AD, modify the filter housing of t he housing upper part of the main transmission in accordance with the in structions of paragraph 3.B.2 (a) of ECD Alert Service Bulleti n (ASB) EC135-63A-017.
(2) From the effective date of this AD, do not install a P/N 4649 301 034 main transmission upper part with a s/n as listed in Appendix 1 of this AD on any helicopter, unless it has been m odified as required by paragraph (1) of this AD, or reworked as requi red by paragraph (3) of this AD.
(3) Within 4 000 flight hours, or at the next main transmission repair or overhaul, whichever occurs first after th e effective date of this AD, rework each main transmission housing upper part with a s/n as listed in Appendix 1 of this AD in accordance with the instructions of paragraph 3.B.2 (b) of the E CD ASB EC135-63A-017.

Ref. Publications: ECD ASB EC135-63A-017 or iginal issue dated 11 October 2010.
The use of later approved revisions of this document is acceptable for compliance with the requirements of this AD.

Remarks : 1. If requested and appropriately substantiated, EASA can approve Alternative Methods of Compliance for this AD.
2. The required actions and the risk a llowance have granted the issuance of a Final AD with Request for Comments, postponing the public consultation process after publication.
3. Enquiries regarding this AD should be referred to the Airworthiness Directives, Safety Management & Re search Section, Certification Directorate, EASA. E-mail ADs@easa.europa.eu
4. For any question concerning the tec hnical content of the requirements in this AD, please contact: Eurocopter Deutschland GmbH, Industriestrasse 4, 86607 Donauwörth, Federal Republic of Germany Telephone: + 49 (0)151-1422 8976; Facsimile: + 49 (0)906-71 4111.EASA AD No.: 2010-0213

EASA Form 110 Page 3/3 

### APPENDIX 1

List of affected P/N 4649 301 034 Main Transmission Housing Upper Parts

serial numbers 111 263 1066 through 1100 115 265 1102 through 1120 119 267 through 269 1122 through 1147 127 271 through 274 1149 through 1197 130 276 1199 through 1214 136 277 1216 through 1243 137 279 through 281 1245 through 1265 144 289 1267 through 1294 151 through 153 292 1296 through 1305 155 294 1307 through 1313 156 through 159 295 through 297 1315 through 1359 161 through 163 300 1361 through 1373 165 through 168 302 1375 through 1410 170 304 1412 through 1417 171 305 1419 through 1428 173 307 1430 through 1447 175 through 179 309 1449 through 1462 181 310 1464 through 1472 183 through 190 313 1478 through 1500 193 316 1502 through 1536
195 318 1538 200 through 203 319 1540 through 1555 209 322 1557 through 1565 215 323 1567 through 1584 217 329 through 333 1586 through 1604 218 335 through 339 1606 through 1633 220 341 through 343 1635 through 1643 223 345 through 349 1645
224 351 1646 227 355 1649 through 1656 242 357 1658 through 1682 244 358 1684 through 1709 249 360 1711 through 1714 250 363 1716 through 1718 245 through 248 364 1720 through 1730
251 366 1732 254 1000 through 1006 1733 255 1008 through 1027 1735 257 1029 through 1032 1736 259 1034 through 1037 1742 260 1039 through 1048 262 1050 through 1064