Airworthiness DirectiveEASA AD BR-2021-05-01R1

Hydraulic Power - Alternating Current Motor Pump - Replacement

Published: Mar 22, 2023
Effective: Mar 23, 2023
Deadline: Mar 23, 2023
Replaces: 2021-05-01

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What to do

Operators of Embraer ERJ190-300 and ERJ190-400 aircraft must replace the ACMP 3A pump with PN 3033041-101 within 300 flight hours after May 14, 2021, or before it reaches 2,700 flight hours, repeating replacements before reaching 2,700 hours each time. They must update the AFM to Revision 12 or later within 30 days of the directive's effective date. Ultimately, the affected pump must be replaced with the new PN 3033041-102 to terminate repetitive replacements.

Summary

Brazilian Airworthiness Directive AD 2021-05-01R1 is an amendment issued by the Agência Nacional de Aviação Civil (ANAC) affecting Embraer ERJ190-300 and ERJ190-400 aircraft equipped with hydraulic system #3 main alternating current motor pump (ACMP 3A) Part Number 3033041-101. This directive addresses premature failures of the ACMP 3A tail bearing that could lead to loss of hydraulic system #3 and impact electrical power distribution, potentially compromising aircraft control. It mandates updated Aircraft Flight Manual (AFM) procedures and replacement of the affected pump with a more robust part number.

What changed

This directive cancels and replaces the previous AD 2021-05-01, introducing updated AFM procedures and a terminal action requiring replacement of the ACMP 3A pump with a new part number 3033041-102. It establishes repetitive replacement intervals for the affected pump and clarifies serviceable part definitions. The amendment also incorporates Embraer Service Bulletin SB190E2-29-0003 revisions and AFM updates.

Why it matters

The directive is critical for maintaining flight safety by preventing hydraulic system failures that could lead to loss of aircraft control, especially when combined with an independent engine failure. Operators and maintenance organizations must ensure compliance to avoid unsafe conditions and regulatory penalties. The updated procedures and terminal action reduce the risk of pump failure and associated operational disruptions.

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