Airworthiness Directive · Amendment 39-15193 · McDonnell Douglas Model 717-200 Airplanes
McDonnell Douglas Model 717-200 Airplanes
This AD applies to all McDonnell Douglas Model 717-200 airplanes, certificated in any category.
The FAA is adopting a new airworthiness directive (AD) for all McDonnell Douglas Model 717-200 airplanes. This AD requires inspecting the power conversion distribution unit (PCDU) to determine its part number, and modifying certain PCDUs. This AD results from reports of failed 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.
You are responsible for having the actions required by this AD performed within the compliance times specified, unless the actions have already been done.
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.
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.
Before or concurrently with the modification required by paragraph (g) of this AD, do the applicable actions specified in Table 1 of this AD.
| 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. |
(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.
