Main Deck Oxygen Alert System - Circuit Breaker Wiring Connection - Inspection
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AI-generated summary of the official EASA document. Verify against the PDF before acting.
What to do
Operators must perform a visual inspection of the wiring connection at circuit breaker C9066 and correct any faults according to IAI Service Bulletin 368-24-098 Rev.1 dated June 23, 2021. After correction, the Main Deck Oxygen Alert System must be tested. Compliance is required within 10 days from the effective date of July 1, 2021.
Summary
Airworthiness Directive AD ISR-I-24-2021-6-6R1 issued by the State of Israel Civil Aviation Authority mandates inspection and correction of the wiring connection for the Main Deck Oxygen Alert System circuit breaker on Boeing 767-300BDSF special freighter conversions. This directive applies to aircraft modified under CAAI STC SA218, FAA STC ST02040SE, and EASA STC 10028430. The directive addresses a wiring error that could lead to overheating and potential system malfunctions.
What changed
This new Airworthiness Directive introduces a mandatory inspection of the wiring connection common to circuit breaker C9066, correcting any improper connections and testing the Main Deck Oxygen Alert System. It clarifies that wire W0040-9003-20 must connect to Terminal 1 of circuit breaker C9066 instead of Terminal 2 to prevent overheating and possible wire damage.
Why it matters
This directive is critical for aviation professionals because improper wiring can cause smoke alarms, increasing crew workload, and may lead to short circuits affecting other systems. Ensuring correct wiring enhances aircraft safety and prevents potential in-flight electrical hazards. Operators and maintenance teams must address this promptly to maintain airworthiness and compliance.
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