The function of the pivot doors is to control the direction of the engine exhaust-gases flow. When the pivot doors are in the stowed-and-locked position, the exhaust gases are pointed rearward. In this configuration, the power plant gives forward thrust for taxi, take-off and the flight. When the pivot doors are in deployed position, the exhaust gases are pointed forward. In this configuration, the power plant gives reverse thrust to decrease the aircraft speed on the landing strip and during taxi.

The upper pivot door is attached with pivot pins between the side beams of the thrust reverser assembly. The pivot pins attach the upper pivot door on spherical bearings to allow small deformations and misalignments during reverse thrust. Thus, the load on the fixed structure is lower.

The upper pivot door is an assembly of forged and machined items from aluminum alloy. The upper pivot door includes the outer and inner surfaces. The outer surface supplies an aerodynamic shape to the power plant when the upper pivot door is in the stowed-and-locked position.

The inner surface points the engine exhaust gases rearward when the upper pivot door is in the stowed and locked position. It receives the airflow pressure when the upper pivot door is in the deployed position.

The hydraulically operated pivot door actuator controls the movement of the lower pivot door. One end of the actuator is attached to the pivot door structure and the other end to a spherical bearing in the forward attachment assembly.

The lower pivot door is attached with pivot pins between the side beams of the thrust reverser assembly. The pivot pins attach the lower pivot door on spherical bearings to allow small deformations and misalignments during reverse thrust. Thus, the load on the fixed structure is lower.

The lower pivot door is an assembly of forged and machined items from aluminum alloy. The lower pivot door includes the outer and inner surfaces. The outer surface supplies an aerodynamic shape to the power plant when the lower pivot door is in the stowed-and-locked position. The inner surface points the engine exhaust gases rearward when the lower pivot door is in the stowed-and-locked position. It receives the airflow pressure when the lower pivot door is in the deployed position.

An hydraulically operated pivot door actuator controls the movement of the lower pivot door. One end of the actuator is attached to the pivot door structure and the other end to a spherical bearing in the forward attachment assembly.