2008-24-12: Bolt which connects the PCU (power control unit) to the elevator surface

2008-24-12 Bombardier: Amendment 39-15753. Docket No. FAA-2008-1238; Directorate Identifier 2008-NM-181-AD. Effective Date (a) This airworthiness directive (AD) becomes effective December 15, 2008. Affected ADs (b) None. Applicability (c) This AD applies to Bombardier Model BD-700-1A10 and BD-700- 1A11 airplanes, certificated in any category, serial numbers (S/Ns) 9002 through 9222 inclusive; equipped with elevator power control units (PCUs) having part number (P/N) GT411-3800-5 or GT411-3800-7. Subject (d) Air Transport Association (ATA) of America Code 27: Flight controls. Reason (e) The mandatory continued airworthiness information (MCAI) states: During scheduled maintenance inspection, a bolt which connects the PCU (power control unit) to the elevator surface was found fractured in the assembly. Further inspection of the assembly revealed that the bearing on the PCU rod end had seized, which resulted in damage to the attachment fitting bushing and fracture of the bolt. Inspection of other in-service airplanes revealed two more seized PCU attachment joints. However, except seizure, no fractured bolt was found on these airplanes. Failure of the bolts in both PCUs on one side could result in disconnection of the elevator control surface which would lead to flutter and loss of the aircraft. This Airworthiness Directive (AD) is issued to mandate the inspection and lubrication of all part number (P/N) GT411-3800-5 and GT411-3800-7 PCU attachment joints. The required actions include inspections for damage and seizure (including signs of seizure) of the PCU attachment joints, an inspection for damage (including wear damage, fretting, corrosion, galling, scoring, fretting wear, and parts that do not meet inspection requirements) of the PCU attachment joint components, and applicable corrective actions. Actions and Compliance (f) Unless already done: For airplanes on which elevator PCUs with P/N GT411-3800-5 or P/N GT411-3800-7, S/N 0615 and lower, are installed, excluding P/N GT411-3800-7 PCUs having a serial number listed in Table 1 of this AD, and excluding P/N GT411-3800-7 PCUs on which less than 1,000 flight hours have accumulated on the PCUs as of the effective date of this AD, do the actions specified in paragraphs (f)(1), (f)(2), and (f)(3) of this AD. Note 1: Units listed in Table 1 of this AD have been lubricated by the vendor and the inspections required by paragraphs (f)(1), (f)(2), (f)(3), and (f)(4) of this AD are not required for those units. Table 1--Serial Numbers 0030 0097 0156 0188 0218 0369 0438 0031 0101 0161 0190 0222 0406 0453 0033 0105 0163 0191 0223 0407 0491 0041 0108 0164 0197 0240 0408 0495 0046 0109 0165 0198 0262 0413 0504 0060 0110 0171 0199 0265 0420 0506 0062 0111 0173 0202 0281 0427 0513 0066 0119 0174 0205 0296 0429 0533 0081 0130 0178 0206 0301 0430 05360083 0138 0179 0208 0310 0431 0586 0087 0141 0181 0210 0323 0433 0092 0145 0183 0214 0365 0435 (1) Within 10 flight cycles or 50 flight hours after the effective date of this AD, whichever occurs first: Inspect for damage and wear and lubricate the PCU attachment joints in accordance with Bombardier Alert Service Bulletin A700-1A11-27-024, Revision 01, dated October 3, 2008; or Bombardier Alert Service Bulletin A700-27-066, Revision 01, dated October 3, 2008; as applicable. (2) Within 90 days or 200 flight hours after performing the actions required by paragraph (f)(1) of this AD, whichever occurs first: Repeat the inspection and lubrication of the PCU attachment joints in accordance with Bombardier Alert Service Bulletin A700- 1A11-27-024, Revision 01, dated October 3, 2008; or Bombardier Alert Service Bulletin A700-27-066, Revision 01, dated October 3, 2008; as applicable. (3) Within 45 days or 100 flight hours after performing the actions required by paragraph (f)(2) of this AD, whichever occurs first: Repeat the inspection and lubrication of the PCU attachment joints in accordance with Bombardier Alert Service Bulletin A700-1A11-27-024, Revision 01, dated October 3, 2008; or Bombardier Alert Service Bulletin A700-27-066, Revision 01, dated October 3, 2008; as applicable. Repeat the inspection thereafter at intervals not to exceed 45 days or 100 flight hours, whichever occurs first, until paragraph (f)(4) of this AD is accomplished. (4) Completion of a disassembly with an inspection for damage, applicable corrective actions, and lubrication of the PCU attachment joint components in accordance with Bombardier Service Bulletin 700- 1A11-27-025, dated October 9, 2008; or Bombardier Service Bulletin 700-27-067, dated October 9, 2008; as applicable; constitutes terminating action for the inspections required by paragraphs (f)(1), (f)(2), and (f)(3) of this AD. (5) Unless already done, if any damage or seizure isfound during any inspection required by paragraphs (f)(1), (f)(2), (f)(3), and (f)(4) of this AD, before further flight, replace the affected part in accordance with Bombardier Service Bulletin 700-1A11-27-025, dated October 9, 2008, or Bombardier Service Bulletin 700-27-067, dated October 9, 2008, as applicable. (6) Actions done before the effective date of this AD in accordance with the Bombardier Alert Service Bulletins A700-1A11-27- 024 and A700-27-066, both dated October 2, 2008, are acceptable for compliance with the corresponding requirements of this AD. (7) Unless already done, submit a report to Bombardier of all findings found during any inspection required by this AD, in accordance with the applicable service bulletin listed in Table 2 of this AD. (i) If the inspection was done on or after the effective date of this AD: Submit the report within 14 days after the inspection. (ii) If the inspection was done before the effective date of this AD: Submit the report within 14 days after the effective date of this AD. Table 2--Service Bulletins for Reports Service Bulletin Revision Level Date Bombardier Alert Service Bulletin A700-1A11-27-024 01 October 3, 2008 Bombardier Alert Service Bulletin A700-27-066 01 October 3, 2008 Bombardier Service Bulletin 700-1A11-27-025 Original October 9, 2008 Bombardier Service Bulletin 700-27-067 Original October 9, 2008 FAA AD Differences Note 2: This AD differs from the MCAI and/or service information as follows: (1) This AD does not mandate the terminating action specified in paragraph A.4. of the MCAI; it is included as an optional terminating action in paragraph (f)(4) of this AD. The planned compliance times for that action would allow enough time to provide notice and opportunity for prior public comment on the merits of those actions. Therefore, we are considering further rulemaking to require the terminating action on all affected airplanes. (2) Paragraph A.3. of the MCAI requires a one-time inspection; however, since we have changed the terminating action in paragraph A.4. of the MCAI to an optional action, paragraph (f)(3) of this AD requires repeating the inspections until the terminating action is performed. (3) This AD does not require the inspection and lubrication of PCUs specified in Paragraph B. of the MCAI. The planned compliance times for those actions would allow enough time to provide notice and opportunity for prior public comment on the merits of those actions. Therefore, we are considering further rulemaking to address this issue. Other FAA AD Provisions (g) The following provisions also apply to this AD: (1) Alternative Methods of Compliance (AMOCs): The Manager, New York Aircraft Certification Office (ACO), FAA, has the authority to approve AMOCs for this AD, if requested using the procedures found in 14 CFR 39.19. Send information to ATTN: Pong K. Lee, Aerospace Engineer, Airframe and Propulsion Branch, ANE-171, FAA, New York ACO, 1600 Stewart Avenue, Suite 410, Westbury, New York 11590; telephone (516) 228-7324; fax (516) 794-5531. Before using any approved AMOC on any airplane to which the AMOC applies, notify your appropriate principal inspector (PI) in the FAA Flight Standards District Office (FSDO), or lacking a PI, your local FSDO. (2) Airworthy Product: For any requirement in this AD to obtain corrective actions from a manufacturer or other source, use these actions if they are FAA-approved. Corrective actions are considered FAA-approved if they are approved by the State of Design Authority (or their delegated agent). You are required to assure the product is airworthy before it is returned to service. (3) Reporting Requirements: For any reporting requirement in this AD, under the provisions of the Paperwork Reduction Act, the Office of Management and Budget (OMB) has approved the information collection requirements and has assigned OMB Control Number 2120- 0056.(4) Special Flight Permits: As described in Section 21.197 and Section 21.199 of the Federal Aviation Regulations (14 CFR 21.197 and 21.199), special flight permits are not allowed. Related Information (h) Refer to Mandatory Continuing Airworthiness Information (MCAI) Transport Canada Civil Aviation Emergency Airworthiness Directive CF-2008-31, dated October 9, 2008, and the service information specified in Table 2 of this AD, for related information. Material Incorporated by Reference (i) You must use the service information specified in Table 3 of this AD to do the actions required by this AD, unless the AD specifies otherwise. (1) The Director of the Federal Register approved the incorporation by reference of this service information under 5 U.S.C. 552(a) and 1 CFR part 51. (2) For service information identified in this AD, contact Bombardier, Inc., 400 C[ocirc]te-Vertu Road West, Dorval, Qu[eacute]bec H4S 1Y9, Canada; telephone 514-855-5000; fax 514-855- 7401; e-mail [email protected]; Internet http:// www.bombardier.com. (3) You may review copies at the FAA, Transport Airplane Directorate, 1601 Lind Avenue, SW., Renton, Washington; or at the National Archives and Records Administration (NARA). For information on the availability of this material at NARA, call (202) 741-6030, or go to: http://www.archives.gov/federal_register/code_of_ federal_regulations/ibr_locations.html. Table 3--Material Incorporated by Reference Service Bulletin Revision Level Date Bombardier Alert Service Bulletin A700-1A11-27-024 01 October 3, 2008 Bombardier Alert Service Bulletin A700-27-066 01 October 3, 2008 Bombardier Service Bulletin 700-1A11-27-025 Original October 9, 2008 Bombardier Service Bulletin 700-27-067 Original October 9, 2008