Airworthiness directives › 2021-15-04
AD 2021-15-04 Airworthiness Directives; The Boeing Company Airplanes
Models named: 767-300 series. Read the applicability below — it usually turns on serial or part numbers too.
Applicability*9
This AD applies to The Boeing Company Model 767-300 series airplanes, certificated in any category, that have been modified to a Bedek Division Special Freighter (BDSF), in accordance with FAA Supplemental Type Certificate (STC) ST02040SE (the freighter configuration is designated as 767-300BDSF), and which are listed in paragraph 1.A., “Effectivity,” of IAI-Aviation Group Alert Service Bulletin 368-24-098, Revision 1, dated June 2021.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
Within 10 days after the effective date of this AD, perform a detailed inspection of the wiring connection common to the C9066 circuit breaker to make sure 20 AWG wire is connected to terminal 1 and the BUS is connected to terminal 2, in accordance with steps 1. through 3. of the Accomplishment Instructions of IAI-Aviation Group Alert Service Bulletin 368-24-098, Revision 1, dated June 2021. If 20 AWG wire is not connected to terminal 1 or the BUS is not connected to terminal 2, before further flight, make changes to the wiring connection and test the main deck oxygen alert system, in accordance with steps 4. through 13. of the Accomplishment Instructions of IAI-Aviation Group Alert Service Bulletin 368-24-098, Revision 1, dated June 2021.
Unsafe condition
This AD was prompted by a report that the electrical diagram for the C9066 circuit breaker connection (wiring) for the “Main Deck Oxygen Alert Control” is erroneous and might have resulted in incorrect installation. The FAA is issuing this AD to address potential incorrect installation of the “Main Deck Oxygen Alert Control” circuit breaker, which could result in overheating and burning of the wiring, and consequently, could result in smoke triggering an alarm and causing the crew workload to increase; or could result in a short circuit to adjacent wires causing malfunctions in other systems. Furthermore, since this is a potentially unprotected circuit, if any failure occurs along the length of this circuit it could result in a fire and cause collateral damage to adjacent circuits and affect critical systems necessary for continued safe flight and landing.
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