Airworthiness directives › 2004-05-14
AD 2004-05-14 Airworthiness Directives; Boeing Model 707 and 720 Series Airplanes
Models named: 707, 720 series. Read the applicability below — it usually turns on serial or part numbers too.
Applicability*9
All Model 707 and 720 series airplanes, as listed in Boeing 707/720 Alert Service Bulletin A3502, dated February 21, 2002; certificated in any category.
Compliance
Required as indicated, unless accomplished previously. To prevent separation of the engine from the airplane due to stress corrosion cracking and consequent fracturing of the bolts, accomplish the following: Service Bulletin References (a) The term “service bulletin,” as used in this AD, means the Accomplishment Instructions of Boeing 707/720 Alert Service Bulletin A3502, dated February 21, 2002. Inspection and Corrective Action (b) Except as provided by paragraph (c) of this AD, within 12 months from the effective date of this AD, perform a general visual inspection of the bolts forward of the wing front spar upper chord on the overwing support fittings of the inboard and outboard nacelle struts to verify that BACB30US type bolts are installed, per Figure 1 of the service bulletin. Note 1: For the purposes of this AD, a general visual inspection is defined as: “A visual examination of an interior or exterior area, installation, or assembly to detect obvious damage, failure, or irregularity. This level of inspection is made from within touching distance unless otherwise specified. A mirror may be necessary to enhance visual access to all exposed surfaces in the inspection area. This level of inspection is made under normally available lighting conditions such as daylight, hangar lighting, flashlight, or droplight and may require removal or opening of access panels or doors. Stands, ladders, or platforms may be required to gain proximity to the area being checked.” (c) The service bulletin specifies that reviewing records is another way to verify if a BACB30US type bolt is installed. However, this AD does not allow that alternative. The general visual inspection required by paragraph (b) of this AD must be accomplished to verify if BACB30US type bolts are installed. (d) If any bolt other than the BACB30US type bolts specified in Figure 1 of the service bulletin is found during the inspection required by paragraph (b) of this AD or if any bolt cannot be identified: Prior to further flight, do the actions specified in paragraphs (d)(1) and (d)(2) of this AD, per Figure 2 of the service bulletin. (1) Perform a high frequency eddy current (HFEC) inspection of the hole bore for cracks and corrosion and measure the hole to verify the diameter is within the specified dimensions. If any corrosion or cracking is found or if the measured hole diameter is not within the specified dimensions, and the service bulletin specifies to contact Boeing for appropriate action: Prior to further flight, repair per a method approved by the Manager, Seattle Aircraft Certification Office (ACO), FAA; or per data meeting the type certification basis of the airplane approved by a Boeing Company Designated Engineering Representative who has been authorized by the Manager, Seattle ACO, to make such findings. For a repair method to be approved, the approval must specifically reference this AD. (2) Replace the bolt with a new BACB30US type bolt per Figure 2 of the service bulletin. Parts Installation (e) As of the effective date of this AD, no person shall install any bolt other than a BACB30US type bolt in the locations specified in this AD, on any airplane. Alternative Methods of Compliance (f) In accordance with 14 CFR 39.19, the Manager, Seattle Aircraft Certification Office, FAA, is authorized to approve alternative methods of compliance for this AD. Incorporation by Reference (g) Unless otherwise specified in this AD, the actions shall be done in accordance with Boeing 707/720 Alert Service Bulletin A3502, dated February 21, 2002. This incorporation by reference was approved by the Director of the Federal Register in accordance with 5 U.S.C. 552(a) and 1 CFR part 51. Copies may be obtained from Boeing Commercial Airplanes, P.O. Box 3707, Seattle, Washington 98124-2207. Copies may be inspected at the FAA, Transport Airplane Directorate, 1601 Lind Avenue, SW., Renton, Washington; or at the Office of the Federal Register, 800 North Capitol Street, NW., suite 700, Washington, DC. Effective Date (h) This amendment becomes effective on April 14, 2004. Issued in Renton, Washington, on February 24, 2004. Kalene C. Yanamura, Acting Manager, Transport Airplane Directorate, Aircraft Certification Service. [FR Doc. 04-4684 Filed 3-9-04; 8:45 am] BILLING CODE 4910-13-P
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