FAA Advisory Circular Addresses Unwanted Reverse Thrust | Aviation International News

Regulations and Government

FAA Advisory Circular Addresses Unwanted Reverse Thrust

The FAA's recent amendments to Part 25 airworthiness regulations require system safety assessments for key systems

Aircelle is delivering thrust reversers for the Passport engine shipset to equip the first Bombardier Global 7000 business jet to fly. Aircelle builds the reversers as part of its role in Nexcelle–the joint venture with GE Aviation’s Middle River Aircraft Systems.

By Gordon Gilbert • Contributor - Accidents and Regulations

September 13, 2024

Recently published FAA Advisory Circular AC 25.933-1 provides guidelines for large aircraft manufacturers to comply with updated safety regulations aimed at preventing dangerous thrust reversals during flight. The document stems from recent amendments to FAA Part 25 airworthiness regulations that take effect September 24 and require system safety assessments for key systems such as flight controls and powerplants.

It also highlights the increased risk of unwanted reverser deployments in modern aircraft. “As the predominant configuration of large transport-category airplanes has developed into a high-bypass-ratio twin-engine-powered models, recovery from an unwanted in-flight thrust reversal have decreased,” the circular says.

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