Airworthiness Directive · Amendment 39-21779 · Time limits/maintenance checks
The Boeing Company Airplanes
This AD applies to The Boeing Company Model 747-400F series airplanes, certificated in any category, equipped with a dual non-activated global navigation satellite system (GNSS) unit and antenna installed in accordance with supplemental type certificate (STC) ST04393NY, dated September 3, 2019.
The FAA is adopting a new airworthiness directive (AD) for certain The Boeing Company Model 747-400F series airplanes. This AD was prompted by the determination that more restrictive tasks and limitations are necessary. This AD requires revising the existing maintenance or inspection program, as applicable, to incorporate more restrictive tasks and limitations, as specified in a European Union Aviation Safety Agency (EASA) AD, which is incorporated by reference. The FAA is issuing this AD to address the unsafe condition on these products.
Except as specified in paragraph (h) of this AD: Comply with all required actions and compliance times specified in, and in accordance with, EASA AD 2021-0138, dated June 9, 2021.
(1) Where EASA AD 2021-0138 refers to its effective date, this AD requires using the effective date of this AD.
(2) The requirements specified in paragraphs (1) and (2) of EASA AD 2021-0138 do not apply to this AD.
(3) Paragraph (3) of EASA AD 2021-0138 specifies revising “the approved AMP” within 12 months after its effective date, but this AD requires revising the existing maintenance or inspection program, as applicable, within 90 days after the effective date of this AD.
(4) The initial compliance time for doing the tasks specified in paragraph (3) of EASA AD 2021-0138 is at the applicable “thresholds” as incorporated by the requirements of paragraph (3) of EASA AD 2021-0138, or within 90 days after the effective date of this AD, whichever occurs later.
(5) The provisions specified in paragraph (4) of EASA AD 2021-0138 do not apply to this AD.
(6) The “Remarks” section of EASA AD 2021-0138 does not apply to this AD.
After the existing maintenance or inspection program has been revised as required by paragraph (g) of this AD, no alternative actions (e.g., inspections) and intervals are allowed unless they are approved as specified in the provisions of the “Ref. Publications” section of EASA AD 2021-0138.
The following provisions also apply to this AD:
(1) Alternative Methods of Compliance (AMOCs): The Manager, New York ACO Branch, FAA, has the authority to approve AMOCs for this AD, if requested using the procedures found in 14 CFR 39.19. In accordance with 14 CFR 39.19, send your request to your principal inspector or responsible Flight Standards Office, as appropriate. If sending information directly to the manager of the certification office, send it to the attention of the person identified in paragraph (k) of this AD. Information may be emailed to: ATTN: Program Manager, Continuing Operational Safety, FAA, New York ACO Branch, 1600 Stewart Avenue, Suite 410, Westbury, NY 11590; telephone 516-228-7300; fax 516-794-5531. Before using any approved AMOC, notify your appropriate principal inspector, or lacking a principal inspector, the manager of the responsible Flight Standards Office.
(2) Contacting the Manufacturer: For any requirement in this AD to obtain instructions from a manufacturer, the instructions must be accomplished using a method approved by the Manager, New York ACO Branch, FAA; or EASA; or Fokker Service's EASA Design Organization Approval (DOA). If approved by the DOA, the approval must include the DOA-authorized signature.
