EASA AD ISR-I-35-2022-12-9: Supernumerary Oxygen System Mask Replacement | RegNotify

Airworthiness DirectiveEASA AD ISR-I-35-2022-12-9

Supernumerary Oxygen System Mask Replacement

Published: Feb 13, 2023
Effective: Feb 8, 2023
Deadline: Feb 8, 2024

AI-generated summary of the official EASA document. Verify against the PDF before acting.

What to do

Operators of affected Boeing 737-300/-400 and 737-700/-800 aircraft must replace Safran oxygen masks P/N 28314-12 with B/E Aerospace masks P/N 174097-11 during the next suitable planned maintenance inspection. This replacement must be completed within 12 months from the effective date of February 8, 2023. Contact the Civil Aviation Authority of Israel for further information if needed.

Summary

Airworthiness Directive AD ISR I-35-2022-12-9 issued by the Civil Aviation Authority of Israel mandates the replacement of supernumerary oxygen system masks on Boeing 737-300/-400 and 737-700/-800 aircraft. The directive applies to aircraft serial numbers listed in service bulletins SB 365-35-M058 and SB 365-35-M011. It requires the installation of oxygen masks with TSO C64a authorization to ensure compliance with airworthiness regulations.

What changed

This new Airworthiness Directive introduces the requirement to replace the currently installed Safran oxygen masks, part number 28314-12, with B/E Aerospace oxygen masks, part number 174097-11, which have TSO C64a approval. The change addresses the lack of performance data for the existing masks and ensures regulatory compliance for the supernumerary oxygen mask and cylinder assemblies.

Why it matters

This directive is critical for aviation professionals because it ensures that oxygen masks meet recognized performance standards, enhancing safety for crew and passengers. Operators and maintenance organizations must update their equipment to remain compliant with airworthiness requirements, avoiding operational restrictions. Compliance teams need to track and implement this change within the specified timeframe to maintain aircraft airworthiness certificates.

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