Electrical Power – Cockpit Display Systems – Tests; Aircraft Flight Manual / Master Minimum Equipment List – Amendment
Superseded. Comply with 2023-0078R1, which replaces this document.
- Published
- Effective
- Deadline
AI-generated summary of the official EASA document. Verify against the PDF before acting.
What to do
Operators of affected ATR 42-500 and ATR 72-212A aircraft must amend the AFM within 7 days of 5 May 2021 and update the MMEL accordingly. Group 2 aircraft must perform operational tests on contactor FIN 1PA within 30 days and electrical tests on battery toggle switch FIN 7PA within 2 months of the effective date. Test results must be reported to ATR within 10 days after each test. Any discrepancies found during tests require corrective action before further flight.
Summary
EASA Airworthiness Directive 2021-0120-E is an emergency directive addressing safety issues on ATR 42-500 and ATR 72-212A aeroplanes equipped with ATR modification 05948 (the '-600 version'). It mandates amendments to the Aircraft Flight Manual and Master Minimum Equipment List, and requires operational and electrical tests on specific electrical components related to cockpit display systems. The directive aims to prevent loss of all display units and the Integrated Electronic Standby Instrument due to potential faults in the battery toggle switch and contactor.
What changed
This directive introduces temporary amendments to the AFM and MMEL, requiring operators to perform operational tests on contactor FIN 1PA and electrical impedance tests on battery toggle switch FIN 7PA. It also mandates reporting of test results to ATR and restricts dispatch of aircraft with certain electrical equipment inoperative. These measures are interim actions pending further investigation.
Why it matters
The directive addresses a critical safety risk that could lead to loss of aircraft control due to failure of cockpit display systems. Compliance ensures continued airworthiness and operational safety for affected ATR 42 and ATR 72 aircraft. Operators, maintenance organizations, and compliance teams must implement these measures promptly to avoid regulatory violations and maintain safe flight operations.
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