Airworthiness directives › 2026-08-06
AD 2026-08-06 Airworthiness Directives; The Boeing Company Airplanes
Models named: 747-400 series. Read the applicability below — it usually turns on serial or part numbers too.
Applicability*9
This AD applies to The Boeing Company Model 747-400 series airplanes, certificated in any category, that have been converted to a freighter configuration in accordance with Supplemental Type Certificate (STC) ST01676SE or converted to special freighter configuration in accordance with STC ST01706SE.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
(1) Before further flight after the effective date of this AD, do a detailed inspection for chafing and arcing damage of the crew oxygen bottle flexible hoses and the adjacent wire harnesses, and for minimum clearance between the crew oxygen bottle flexible hose and the adjacent wire harnesses, in accordance with the Accomplishment Instructions of Israel Aerospace Industries Ltd. Service Bulletin 366-35-157, dated January 2026. (2) If, during any inspection required by paragraph (g)(1) of this AD, any chafing or arcing damage is found, or the clearance is less than 2 inches, before further flight, repair using a method approved by the Manager, International Validation Branch, FAA; or the Civil Aviation Authority of Israel (CAAI); or the CAAI's authorized Designee. If approved by the CAAI Designee, the approval must include the Designee's authorized signature.
Unsafe condition
This AD was prompted by a report of a ruptured crew oxygen bottle flexible hose and arcing damage on an adjacent cargo loading system (CLS) wiring harness near station (STA) 680. The FAA is issuing this AD to address chafing, arcing damage, and insufficient clearance between the crew oxygen bottle flexible hoses and adjacent wire harnesses. The unsafe condition, if not addressed, could result in fire and loss of crew oxygen supply.
Affected ADs
None.
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