Airworthiness directives › 2018-23-13
AD 2018-23-13 Airworthiness Directives; The Boeing Company Airplanes
Models named: 747-8, 747-8F series. Read the applicability below — it usually turns on serial or part numbers too.
Applicability*9
This AD applies to all The Boeing Company Model 747-8 and 747-8F series airplanes, certificated in any category.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
For airplanes with an original certificate of airworthiness, or an original export certificate of airworthiness, issued on or before the effective date of this AD: Within 72 months after the effective date of this AD, inspect for oxygen mask/regulator part number (P/N) MLD20-626-1. A review of airplane maintenance records is acceptable in lieu of the part number inspection if the part number of the oxygen mask/regulator can be conclusively determined from that review. If any oxygen mask/regulator P/N MLD20-626-1 is found, within 72 months after the effective date of this AD, do the actions identified in paragraph (g)(1), (g)(2), or (g)(3) of this AD. (1) Do all applicable actions identified as “RC” (required for compliance) in, and in accordance with, the Accomplishment Instructions of Boeing Special Attention Service Bulletin 747-35-2133, Revision 1, dated November 1, 2017, except as provided by paragraph (h) of this AD. (2) Except as specified in paragraph (i)(3) of this AD: Remove oxygen mask/regulator P/N MLD20-626-1 and install any new or serviceable oxygen mask/regulator that is not P/N MLD20-626-1 and that is FAA approved for installation on the airplane. Note 1 to paragraphs (g)(2) and (g)(3) of this AD: Guidance for the installation procedures can be found in Boeing Model 747 Aircraft Maintenance Manual (AMM) 35-11-18. (3) Except as specified in paragraph (i)(3) of this AD: Remove the oxygen mask/regulator P/N MLD20-626-1 and the installed oxygen mask stowage box combination, and install any new or serviceable oxygen mask/regulator and stowage box combination that does not include oxygen mask/regulator P/N MLD20-626-1, and that is FAA approved for installation on the airplane.
Unsafe condition
This AD was prompted by a report that flightcrew oxygen masks did not function as designed during flight testing. We are issuing this AD to address flightcrew oxygen masks/regulators that do not deploy correctly, which could result in a delay for the flightcrew to put on the masks, which may lead to hypoxia and loss of useful consciousness, potentially resulting in loss of control of the airplane.
Affected ADs
None.
Read the original on the Federal Register →
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The directive text above is reproduced from the Federal Register, a work of the United States government and in the public domain. The separation into applicability, compliance and required actions is TrackAD's.*1