Airworthiness Directive · Amendment 39-14230 · Boeing Model 747, 757, 767 and 777 Series Airplanes
Boeing Model 747, 757, 767 and 777 Series Airplanes
This AD applies to Model 747, 757, 767, and 777 series airplanes having the line numbers (L/Ns) listed in Table 1 of this AD; certificated in any category.
| Model | Affected L/Ns | Except L/Ns |
|---|---|---|
| 747 | 1 through 299 inclusive and 951 through 1234 inclusive | 292, 296, 297, 1174, 1216. |
| 757 | 2 through 895 inclusive | 870, 886, 894. |
| 767 | 470 through 768 inclusive | 758. |
| 777 | 2 through 253 inclusive | 120, 219, 230, 235, 242, 245, 249. |
The FAA is superseding an existing airworthiness directive (AD), which applies to certain Boeing Model 747, 757, 767, and 777 series airplanes. That AD currently requires modifying certain drip shields located on the flight deck, and follow-on actions. This new AD removes certain airplanes that are included in the applicability statement of the existing AD, and requires modifying additional drip shields on the flight deck of certain other airplanes. This AD is prompted by a determination that certain airplanes have drip shields that are not adequately resistant to fire. We are issuing this AD to prevent potential ignition of the moisture barrier cover of the drip shield, which could propagate a small fire that results from an electrical arc, leading to a larger fire.
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 6 years after February 2, 2001 (the effective date of AD 2000-26-04), accomplish paragraphs (f)(1), (f)(2), and (f)(3) of this AD; in accordance with Boeing Service Bulletin 747-25-3253, dated June 29, 2000, or Revision 3, dated September 4, 2003; 757-25-0226, dated July 3, 2000, or Revision 3, dated September 2, 2004; 757-25-0228, dated July 3, 2000, or Revision 1, dated March 28, 2002; 767-25-0290, dated June 29, 2000, or Revision 4, dated October 28, 2004; or 777-25-0164, dated June 29, 2000, or Revision 1, including Appendices A, B, C, and D, all dated March 22, 2001; as applicable; except as provided by paragraph (g) of this AD. For Model 757-200, -200CB, and -200PF series airplanes identified as being in Groups 1 and 3 in Boeing Service Bulletin 757-25-0226, Revision 3: As of the effective date of this AD, only Revision 3 of the service bulletin may be used. For Model 747 and 767 series airplanes: As of the effective date of this AD, only Boeing Service Bulletin 747-25-3253, Revision 3, or 767-25-0290, Revision 4, as applicable, may be used.
(1) Modify drip shields located on the flight deck by installing fire blocks.
(2) Prior to further flight following accomplishment of paragraph (f)(1) of this AD, perform a functional test of any system disturbed by the modification, in accordance with the applicable service bulletin or airplane maintenance manual (AMM), as applicable. If any functional test fails, prior to further flight, isolate the fault, correct the discrepancy in accordance with the applicable AMM, and repeat the failed test until it is successfully accomplished.
(3) Prior to further flight following the accomplishment of paragraphs (f)(1) and (f)(2) of this AD, install placards on all modified drip shields.
(g) If any wires or equipment are installed on the outboard surface of the drip shield (that is, between the drip shield and the airplane structure), modify that area in accordance with a method approved by the Manager, Seattle Aircraft Certification Office (ACO), FAA.
For Model 747 series airplanes listed in Group 1 in Boeing Service Bulletin 747-25-3253, Revision 3, dated September 4, 2003: In lieu of accomplishing paragraph (f) of this AD, within 6 years after February 2, 2001, collect samples of the insulation and adhesive of the drip shields, and submit the samples to the manufacturer for testing, in accordance with the Accomplishment Instructions of Boeing Service Bulletin 747-25-3253, dated June 29, 2000, or Revision 3, dated September 4, 2003. After the effective date of this AD, only Revision 3 may be used.
(1) If the test on all samples is positive, no further action is required by this AD.
(2) If the test on any sample is negative, accomplish paragraph (f) of this AD before the compliance time specified in that paragraph.
(i) For Model 757-200, -200CB, and -200PF series airplanes identified as being in Group 1 or 3 in Boeing Service Bulletin 757-25-0226, Revision 3, dated September 2, 2004, and that were modified before the effective date of this AD in accordance with Boeing Service Bulletin 757-25-0226, dated July 3, 2000: Within 72 months after the effective date of this AD, modify drip shields located above windows number 2 and 3 on the flight deck by installing fire blocks, in accordance with the Accomplishment Instructions of Boeing Service Bulletin 757-25-0226, Revision 3, dated September 2, 2004; except as provided by paragraph (g) of this AD. After the modification, do the actions required by paragraphs (f)(2) and (f)(3) of this AD because these actions apply to the drip shields modified in accordance with this paragraph.
Modifying the drip shields before the effective date of this AD in accordance with the applicable service bulletin specified in paragraph (j)(1), (j)(2), or (j)(3) of this AD is acceptable for compliance with the corresponding requirements of paragraphs (f) and (i) of this AD, as applicable.
(1) For Model 757-200, -200CB, and -200PF series airplanes: Boeing Service Bulletin 757-25-0226, Revision 2, dated October 31, 2002.
(2) For Model 757-200, -200CB, and -200PF series airplanes identified in Groups 2 and 4 of Boeing Service Bulletin 757-25-0226, Revision 3, dated September 2, 2004: Boeing Service Bulletin 757-25-0226, Revision 1, dated February 15, 2001.
(3) For Model 767 series airplanes: Boeing Service Bulletin 767-25-0290, Revision 3, dated June 26, 2003.
The aircraft, engines and makers this AD names, by the model designations in its text. A model listed here may still be outside the AD's serial ranges.
Aircraft
