Airworthiness directives › 2016-09-08
AD 2016-09-08 Airworthiness Directives; The Boeing Company Airplanes
Models named: 747-8 series. Read the applicability below — it usually turns on serial or part numbers too.
Applicability*9
This AD applies to The Boeing Company Model 747-8 series airplanes, certificated in any category, as identified in Boeing Alert Service Bulletin 747-21A2571, dated December 4, 2015.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
Except as required by paragraph (h) of this AD, at the applicable time in paragraph 1.E., “Compliance,” of Boeing Alert Service Bulletin 747-21A2571, dated December 4, 2015, do a detailed inspection for correct installation of the backup air supply clamp, and before further flight, do all applicable related investigative and corrective actions, in accordance with the Accomplishment Instructions of paragraph 1.E., “Compliance,” of Boeing Alert Service Bulletin 747-21A2571, dated December 4, 2015.
Unsafe condition
This AD was prompted by a report indicating that flex hoses of the occupant backup air supply were found disconnected from the adjacent fiberglass duct on two airplanes. We are issuing this AD to detect and correct an incorrect clamp installation on the inboard end of the flex hose, which allows the flex hose to slowly become disconnected from the adjacent fiberglass duct, and damage to the hose. This condition, in conjunction with a cargo fire event, can potentially lead to decreased airflow to the main deck, possibly resulting in smoke and/or toxic fumes penetrating into the main deck passenger compartment, which could result in injury to the passengers or cabin crew.
Affected ADs
None.
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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