Final answer:
The maximum permissible bearing error for IFR operations when conducting a VOR check on the airport surface with an approved test signal is ±4 degrees. This is essential for navigation accuracy and must be checked regularly according to Federal Aviation Regulations.
Step-by-step explanation:
When conducting a VOR (VHF Omnidirectional Range) check on the airport surface with an approved test signal for Instrument Flight Rules (IFR) operations, the maximum permissible bearing error is ±4 degrees. VOR system calibration is critical for navigation accuracy during IFR conditions. It is essential to routinely check the VOR system in accordance with Federal Aviation Regulations to ensure the safety and accuracy of flight operations under IFR.