AD 99-09-51 Airworthiness Directives; McDonnell Douglas Model MD-11 Series Airplanes

Models named: MD-11 series. Read the applicability below — it usually turns on serial or part numbers too.

Model MD-11 series airplanes, certificated in any category; having the following fuselage/factory serial numbers: ------------------------------------------------------------------------ Fuselage No. Serial No. ------------------------------------------------------------------------ 447........................................................ 48401 448........................................................ 48402 449........................................................ 48458 453........................................................ 48411 454........................................................ 48412 455........................................................ 48449 456........................................................ 48407 457........................................................ 48408 461........................................................ 48495 466........................................................ 48416 467........................................................ 48417 470........................................................ 48459 475........................................................ 48461 476........................................................ 48434 478........................................................ 48435 479........................................................ 48450 484........................................................ 48484 486........................................................ 48499 488........................................................ 48413 491........................................................ 48414 492........................................................ 48489 493........................................................ 48500 495........................................................ 48410 496........................................................ 48496 497........................................................ 48460 501........................................................ 48418 502........................................................ 48485 505........................................................ 48451 506........................................................ 48437 509........................................................ 48486 512........................................................ 48497 515........................................................ 48514 516........................................................ 48523 517........................................................ 48547 518........................................................ 48468 519........................................................ 48469 520........................................................ 48502 521........................................................ 48548 523........................................................ 48404 524........................................................ 48405 525........................................................ 48518 528........................................................ 48503 529........................................................ 48512 533........................................................ 48538 539........................................................ 48519 541........................................................ 48520 450........................................................ 48419 451........................................................ 48420 452........................................................ 48421 462........................................................ 48505 469........................................................ 48487 480........................................................ 48472 481........................................................ 48473 482........................................................ 48481 483........................................................ 48436 485........................................................ 48474 489........................................................ 48475 499........................................................ 48490 503........................................................ 48491 504........................................................ 58527 507........................................................ 48528 510........................................................ 48476 511........................................................ 48477 513........................................................ 48501 514........................................................ 48478 522........................................................ 48498 526........................................................ 48550 527........................................................ 48551 530........................................................ 48552 531........................................................ 48553 535........................................................ 48554 536........................................................ 48479 537........................................................ 48596 538........................................................ 48480 540........................................................ 48597 550........................................................ 48598 ------------------------------------------------------------------------ Note 1: This AD only affects Model MD-11 series airplanes equipped with a 72-inch cargo door. Model MD-11 series airplanes equipped with a 104-inch cargo door are not subject to the unsafe condition addressed by this AD due to the configuration of the wire bundles. Note 2: This AD applies to each airplane identified in the preceding applicability provision, regardless of whether it has been modified, altered, or repaired in the area subject to the requirements of this AD. For airplanes that have been modified, altered, or repaired so that the performance of the requirements of this AD is affected, the owner/operator must request approval for an alternative method of compliance in accordance with paragraph (c) of this AD. The request should include an assessment of the effect of the modification, alteration, or repair on the unsafe condition addressed by this AD; and, if the unsafe condition has not been eliminated, the request should include specific proposed actions to address it.

Required as indicated, unless accomplished previously. To ensure that a wire harness support bracket/clamp is installed on the wire bundle at frame 1681, accomplish the following: (a) Within 5 days after the effective date of this AD: Perform a one-time visual inspection under the floorboards in the lower center cargo compartment at frame 1681 (approximately one inch outboard of longeron R46) to verify that a bracket having part number P/N 9D0062-3-16-24 (or equivalent), and an open face nylon clamp having P/N NMC1001-1 or 383-1 (see Figure 1, Item 14/267), are installed to support wire bundle No. AGS9110. (The nylon clamp specified in this paragraph may be a larger size, depending on the size of the wire bundle.) (1) If the bracket and clamp are installed: Prior to further flight, perform a visual inspection to detect damage of the subject wire bundle. If any damage is detected, prior to further flight, accomplish paragraphs (a)(1)(i) and (a)(1)(ii) of this AD. (i) Repair in accordance with Chapter 20-30-01 of the McDonnell Douglas MD-11 Airplane Maintenance Manual. And (ii) Install a silicone rubber coated with a glass cloth protective wrap [Douglas Material Specification (DMS) 2109 or equivalent] around the wire bundle(s) in the area over frame 1681 above stringer R46 in accordance with Chapter 20-10-01 of the McDonnell Douglas MD-11 Wiring Diagram Manual. [[Page 23182]] (2) If the bracket or clamp is not installed: Prior to further flight, perform a visual inspection to detect damage (i.e., chafing, damage, or missing wire insulation) of the subject wire bundle(s). (i) If no damage is detected: Prior to further flight, install a silicone rubber coated with a glass cloth protective wrap (DMS 2109 or equivalent) around the wire bundle(s) in the area over frame 1681 above stringer R46 in accordance with Chapter 20-10-01 of the McDonnell Douglas MD-11 Wiring Diagram Manual. (ii) If any damage is detected: Prior to further flight, accomplish the actions required by paragraphs (a)(1)(i) and (a)(1)(ii) of this AD. (b) Within 10 days after accomplishing the inspection required by paragraphs (a) and (a)(1) of this AD, submit a report of the inspection results (both positive and negative findings) to the Manager, Los Angeles Aircraft Certification Office (ACO), FAA, Transport Airplane Directorate, 3960 Paramount Boulevard, Lakewood, California 90712-4137; fax (562) 627-5210. Information collection requirements contained in this regulation have been approved by the Office of Management and Budget (OMB) under the provisions of the Paperwork Reduction Act of 1980 (44 U.S.C. 3501 et seq.) and have been assigned OMB Control Number 2120-0056. (c) An alternative method of compliance or adjustment of the compliance time that provides an acceptable level of safety may be used if approved by the Manager, Los Angeles ACO. Operators shall submit their requests through an appropriate FAA Principal Maintenance Inspector, who may add comments and then send it to the Manager, Los Angeles ACO. Note 3: Information concerning the existence of approved alternative methods of compliance with this AD, if any, may be obtained from the Los Angeles ACO. (d) Special flight permits may be issued in accordance with sections 21.197 and 21.199 of the Federal Aviation Regulations (14 CFR 21.197 and 21.199) to operate the airplane to a location where the requirements of this AD can be accomplished. (e) This amendment becomes effective on May 5, 1999, to all persons except those persons to whom it was made immediately effective by emergency AD 99-09-51, issued on April 16, 1999, which contained the requirements of this amendment. BILLING CODE 4910-13-P [[Page 23183]] [GRAPHIC] [TIFF OMITTED] TR30AP99.011 Issued in Renton, Washington, on April 23, 1999. Darrell M. Pederson, Acting Manager, Transport Airplane Directorate, Aircraft Certification Service. [FR Doc. 99-10815 Filed 4-29-99; 8:45 am] BILLING CODE 4910-13-C