After an accessory change in a free turbine engine, is it necessary to rig N1 and/or N2 compressor?

After an accessory change in a free turbine engine, is it necessary to rig N1 and/or N2 compressor?

• A. Yes, always rig N1
• B. Yes, always rig N2
• C. No rigging is required
• D. Only rig N2 if performance is affected

Answer: (C)

In the context of a free turbine engine, accessory changes typically do not necessitate the rigging of the N1 or N2 compressors. Rigging is generally involved in adjustments or calibrations of the engine controls to ensure proper operational conditions, especially in situations where components directly affecting the engine's performance or operation are replaced. Since accessory changes do not impact the core functions of the N1 or N2 compressors, rigging is not required. The free turbine engine design features a turbine that operates independently from the compressor, allowing for better efficiency and operation under varying conditions. Because the accessories do not interfere with the performance parameters of the compressor, it is safe to conclude that no rigging is necessary following an accessory change. This understanding reinforces the specific maintenance practices associated with free turbine engines, emphasizing their unique operational design.

In the context of a free turbine engine, accessory changes typically do not necessitate the rigging of the N1 or N2 compressors. Rigging is generally involved in adjustments or calibrations of the engine controls to ensure proper operational conditions, especially in situations where components directly affecting the engine's performance or operation are replaced. Since accessory changes do not impact the core functions of the N1 or N2 compressors, rigging is not required.

The free turbine engine design features a turbine that operates independently from the compressor, allowing for better efficiency and operation under varying conditions. Because the accessories do not interfere with the performance parameters of the compressor, it is safe to conclude that no rigging is necessary following an accessory change. This understanding reinforces the specific maintenance practices associated with free turbine engines, emphasizing their unique operational design.