EASA AD 2021-0039R2: Return to Service

What to do

Operators must install the approved Flight Control Computer and MAX Display System software before the next flight after 27 January 2021, perform required wiring modifications, sensor tests, and install colored caps on stick shaker circuit breakers. They must also update the Airplane Flight Manual and conduct operational readiness flights. Additionally, pilots must complete return to service training in approved simulators prior to operating the aircraft.

Summary

EASA Airworthiness Directive 2021-0039R2 is a regulatory document addressing the return to service of Boeing 737-8 and 737-9 (MAX) aeroplanes. It mandates software updates, modifications, and operational changes to ensure safe flight operations following previous grounding due to safety concerns. The directive covers installation of updated Flight Control Computer and MAX Display System software, wiring modifications, sensor tests, and updated pilot training requirements.

What changed

This revision corrects a paragraph to avoid conflicts with later approved Airplane Flight Manual revisions without changing the original requirements. The directive supersedes earlier versions including EASA AD 2019-0051R1 and introduces mandatory installation of serviceable FCC and MDS DPC software, wiring modifications, and operational readiness flights. It also requires updated pilot training and amendments to minimum equipment lists.

Why it matters

This directive is critical for operators and maintenance organizations to ensure compliance with updated safety standards following fatal accidents involving the Boeing 737 MAX. It enables the safe return to service of affected aircraft by addressing software and hardware issues that could lead to loss of control. Compliance ensures regulatory approval for flight operations and mitigates operational risks associated with the MCAS system.

What to do

Summary

What changed

Why it matters

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