AD 2007-19-03 Airworthiness Directives; McDonnell Douglas Model 717-200 Airplanes

Models named: 717-200. Read the applicability below — it usually turns on serial or part numbers too.

This AD applies to all McDonnell Douglas Model 717-200 airplanes, certificated in any category.

You are responsible for having the actions required by this AD performed within the compliance times specified, unless the actions have already been done. Identification of PCDU Part Number (f) Within 20 months after the effective date of this AD, inspect the PCDU to determine its part number. A review of airplane maintenance records is acceptable in lieu of this inspection if the part number can be conclusively determined from that review. (1) If the part number is below 762904E, do the actions specified in paragraphs (g) and (h) of this AD. (2) If the part number is 762904E or higher, no further work is required by this AD. Modification (g) Within 20 months after the effective date of this AD, modify the PCDU in accordance with Boeing Alert Service Bulletin 717-24A0028, Revision 1, dated December 20, 2005. A modification done before the effective date of this AD in accordance with Boeing Alert Service Bulletin 717-24A0028, dated November 24, 2004, is acceptable for compliance with the requirements of this paragraph. Note 1: Boeing Alert Service Bulletin 717-24A0028 refers to Hamilton Sundstrand Service Bulletin 40EGS22P-24-10, Revision 1, dated May 11, 2005, as an additional source of service information for the modification. Concurrent Requirements (h) Before or concurrently with the modification required by paragraph (g) of this AD, do the applicable actions specified in Table 1 of this AD. Table 1.—Concurrent Requirements Do the following— In accordance with Hamilton Sundstrand Service Bulletin— Rework the transformer rectifier unit assembly (TRU) 40EGS22P-24-3, dated June 30, 2000. Rework the W3 wiring harness assembly to install direct lead wires to the TRU Add a ground wire to the TRU transformer Add an insulated spacer to the PCDU top cover Install new PCDU 186 firmware 40EGS22P-24-4, Revision 1, dated January 2, 2002. Install new PCDU 186 firmware 40EGS22P-24-6, dated July 25, 2002. Modify the top cover of the PCDU 40EGS22P-24-7, dated September 3, 2003. Modify printed wiring board (PWB) assemblies A4 and A5 40EGS22P-24-8, dated September 4, 2003. Check and apply torque seal to fasteners on the TRU assembly and to PCDU internal fasteners, as applicable Modify PWB assembly A4 40EGS22P-24-9, dated November 19, 2003. Credit for Accomplishment of Earlier Service Bulletin (i) Installation of new PCDU 186 firmware before the effective date of this AD in accordance with Hamilton Sundstrand Service Bulletin 40EGS22P-24-4, dated April 26, 2001, is acceptable for compliance with the corresponding requirements of paragraph (h) of this AD. Alternative Methods of Compliance (AMOCs) (j)(1) The Manager, Los Angeles Aircraft Certification Office, FAA, has the authority to approve AMOCs for this AD, if requested in accordance with the procedures found in 14 CFR 39.19. (2) To request a different method of compliance or a different compliance time for this AD, follow the procedures in 14 CFR 39.19. 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. Material Incorporated by Reference (k) You must use the service documents identified in Table 2 of this AD to perform the actions that are required by this AD, unless the AD specifies otherwise. Table 2.—Material Incorporated by Reference Service Bulletin Revision level Date Boeing Alert Service Bulletin 717-24A0028 1 December 20, 2005. Hamilton Sundstrand Service Bulletin 40EGS22P-24-3 Original June 30, 2000. Hamilton Sundstrand Service Bulletin 40EGS22P-24-4 1 January 2, 2002. Hamilton Sundstrand Service Bulletin 40EGS22P-24-6 Original July 25, 2002. Hamilton Sundstrand Service Bulletin 40EGS22P-24-7 Original September 3, 2003. Hamilton Sundstrand Service Bulletin 40EGS22P-24-8 Original September 4, 2003. Hamilton Sundstrand Service Bulletin 40EGS22P-24-9 Original November 19, 2003. Hamilton Sundstrand Service Bulletin 40EGS22P-24-4, Revision 1, dated January 2, 2002, has the following effective pages:   Page Nos. Revision level shown on page Date shown on page 1, 3, 4, 5, 6, 7, 8 1 January 2, 2002. 2 Original April 26, 2001. The Director of the Federal Register approved the incorporation by reference of these documents in accordance with 5 U.S.C. 552(a) and 1 CFR part 51. Contact Boeing Commercial Airplanes, Long Beach Division, 3855 Lakewood Boulevard, Long Beach, California 90846, Attention: Data and Service Management, Dept. C1-L5A (D800-0024), for a copy of this service information. 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/cfr/ibr-locations.html . Issued in Renton, Washington, on September 4, 2007. Stephen P. Boyd, Acting Manager, Transport Airplane Directorate, Aircraft Certification Service. [FR Doc. E7-17844 Filed 9-11-07; 8:45 am] BILLING CODE 4910-13-P

This AD results from reports of failed power conversion distribution units (PCDUs), the loss of an electrical bus, and the presence of a strong electrical burning odor in the flight deck and forward cabin. We are issuing this AD to prevent the loss of an electrical bus due to PCDU failure, resulting in the loss of all flight displays for an unacceptable time period, and consequent emergency landing.