stavka wrote on Apr 21^st, 2024 at 6:05pm:

So, can you please explain the "Blue Left Loc" and "AFF" mode on AP rotating knob? Thank You!

From the C130 manual at AVIALOGS.

• BLUE LEFT-LOC : Flying inbound or outbound on the localizer beam. (Think LOC mode on Boeing/Airbus)
  
• GYRO PILOT : Used for any autopilot mode not using radios. Wings level, flies where you point it. Can use the trim and turn dials to fine tune during flight.
  
• RANGE LOC : Used for VOR/VORTAC tracking.
  
• AFF/APR : Approach mode - ILS loc and glideslope tracking. Not sure if this mode is working as intended.