In reduced performance mode, the manual states that the AHRS performs similar to:
Vertical Gyro with roll and pitch erection cutoffs and also with drift and acceleration errors for the attitude indication (I think the main factor contributing to reduced performance mode for this part of the system is the lack of air data) and
Directional Gyro with drift and turn errors for the directional gyro (I think the only factor determining reduced performance here is the flux valve failure)
I didn't think RLG behaved like this? But I'm not sure...
I have so far only been able to find the following errors for RLG:
Long-term errors result from instability of gyro compensation parameters and include the following terms:
• Bias error
• Scale factor error
• Input axes misalignment error
Short-term errors cannot be calibrated and include:
• Dither spillover
• Random walk
• Quantization noise