EASA AD 2023-0078R1
Electrical Power — Direct Current Emergency Electrical Network — Tests / Modification; Aircraft Flight Manual / Master Minimum Equipment List — Amendment
Summary
EASA Airworthiness Directive 2023-0078R1 is a regulatory update addressing electrical power issues related to the direct current emergency electrical network on ATR 42 and ATR 72 aeroplanes. It applies to various ATR 42-400, ATR 42-500, and ATR 72 series aircraft and focuses on tests, modifications, and amendments to the Aircraft Flight Manual and Master Minimum Equipment List to mitigate risks of temporary loss of cockpit display systems.
What Changed
This revision of EASA AD 2023-0078 updates the group classifications of affected aircraft by removing certain serial numbers from Group 1 and reassigning them to Group 3. It restates previous requirements and introduces new mandates including amendments to the AFM and MMEL, operational tests, and a required modification of the battery toggle switch wiring within 12 months. It also prohibits installation of affected parts on certain aircraft groups.
Why It Matters
This directive is critical for aviation professionals because it addresses a potential unsafe condition that could lead to loss of airplane control due to temporary loss of all cockpit display units. Operators and maintenance teams must comply to ensure continued airworthiness and safe operation of affected ATR aircraft. Compliance ensures that electrical system vulnerabilities are mitigated, reducing risk during flight.
What To Do
Operators of affected ATR 42 and ATR 72 aeroplanes must amend their Aircraft Flight Manuals and Master Minimum Equipment Lists as specified, perform operational tests of the contactor within 30 days of the original AD effective date, and complete the required modification of the battery toggle switch wiring within 12 months of this AD's effective date. Installation of affected parts is prohibited after modification or immediately for certain aircraft groups. Flight crews must be informed of all changes.
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