Electrical Power — Direct Current Emergency Electrical Network — Tests / Modification; Aircraft Flight Manual / Master Minimum Equipment List — Amendment
- Published
- Effective
- Deadline
- Replaces
- 2021-0120-E
- Replaces
- 2023-0078
AI-generated summary of the official EASA document. Verify against the PDF before acting.
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.
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.
More for ATR ATR42
All 70- EASA PAD 26-119Oxygen – Oxygen Pressure Regulator – InspectionOct 2, 2026
- EASA AD 2026-0185Flight Controls – Angle of Attack Probes – Functional ChecksSep 29, 2026
- EASA PAD 26-097Flight Controls – Angle of Attack Probes – Functional ChecksAug 27, 2026
- EASA AD 2026-0046Landing Gear — Landing Gear Selector Valve — Functional CheckMar 6, 2026
- EASA AD 2026-0038Air Conditioning — Integrated Air System Control — ModificationFeb 26, 2026
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