West Star Aviation is advising operators of Embraer Legacy 450/500 and Praetor 500/600 aircraft of a newly issued FAA Emergency Airworthiness Directive (AD 2026-08-52) requiring immediate attention and compliance.

As a trusted technical resource for Embraer operators, West Star Aviation is prepared to support rapid compliance while minimizing operational disruption.

Understanding the Issue

Emergency AD 2026-08-52 stems from findings identified by Brazil’s aviation authority (ANAC), which reported failures in one load path of the pitch trim actuator (PTA) within the horizontal stabilizer system.

This condition was discovered during routine maintenance checks and presents a serious risk:

• Potential failure of both load paths of the pitch trim actuator
• Possible unrestricted movement of the horizontal stabilizer under aerodynamic loads
• Increased risk of loss of aircraft control

Due to the severity of the condition, this AD is effective immediately upon receipt, and compliance is mandatory.

Required Actions

The AD mandates operators to perform procedures outlined in ANAC Emergency AD 2026-04-02, including:

Operational Check of the Pitch Trim Actuator (PTA)

• Verification of actuator performance and irreversibility function

Optional Pitch Trim Verification

• Additional validation of system integrity

On-Condition Actions (if discrepancies are found)

• Replacement of the pitch trim actuator if the system fails testing criteria
• Follow-up operational check of any replaced component
• Reporting of test and verification data

Failure conditions include:

• “TEST FAILED” status after five minutes
• “TEST ABORTED” after five repeated attempts

West Star Aviation: Your Partner for Immediate Compliance

West Star Aviation has extensive experience supporting Embraer Legacy and Praetor platforms, including flight control systems, avionics, and scheduled maintenance requirements.

Our teams are equipped to:

• Perform the required PTA operational checks
• Conduct the optional pitch trim verification
• Execute on-condition actuator replacements if required
• Ensure proper documentation and reporting for compliance

With multiple locations and experienced technicians, West Star can respond quickly to help operators meet this urgent requirement.

Act Now

Given the emergency nature of this AD, operators should take immediate steps to schedule compliance. Early action helps ensure:

• Continued airworthiness
• Regulatory compliance
• Minimal disruption to flight operations