FAA: Jet Seal Might Jam Emergency Turbine—Peel and Freak-Out Fix
Published Date: 8/28/2026
Proposed Rule
Summary
The FAA proposes to adopt a new airworthiness directive (AD) for certain Embraer S.A. Model EMB-545 and EMB-550 airplanes. This proposed AD was prompted by the possibility of the Ram Air Turbine (RAT) compartment door seal peeling off and becoming entangled with the RAT rotor. This proposed AD would require replacement of the RAT compartment door seal. The FAA is proposing this AD to address the unsafe condition on these products.
Analyzed Economic Effects
3 provisions identified: 2 benefits, 1 costs, 0 mixed.
Mandatory RAT Door Seal Replacement
If you operate Embraer Model EMB-545 or EMB-550 airplanes, the FAA proposes you must replace the Ram Air Turbine (RAT) compartment door seal as specified in ANAC AD 2021-12-01 (effective December 15, 2021). The replacement uses RAT door seal part number P/N 550-04725-901 and is required because a peeling seal can tangle with the RAT rotor and cause loss of RAT function and possible loss of airplane controllability.
Estimated Compliance Cost for Operators
The FAA estimates the replacement will take 4 work-hours at $85/hour ($340 labor) plus $1,221 parts, for a cost of $1,561 per airplane. The FAA estimates this AD would affect 55 U.S.-registered airplanes for a total estimated cost to U.S. operators of $85,855, though the manufacturer says some or all costs may be covered under warranty.
No Manufacturer Reporting Required
Although ANAC AD 2021-12-01 asks operators to submit certain information to the manufacturer, the FAA's proposed AD does not include that reporting requirement. This means operators are not required by the FAA AD to send those reports to the manufacturer as part of compliance.
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