What is the approach speed with flaps at 15º, when ice is present on the airframe?

When considering the approach speed with flaps extended to 15 degrees and ice present on the airframe, the correct answer of 105 knots is based on the need to maintain a safe margin above stall speed, particularly in the presence of ice. Ice can significantly alter the aerodynamic properties of the aircraft, leading to increased stall speeds due to changes in airflow and potential weight increases.

The approach speed must provide sufficient buffer to maintain control and ensure safe operations during landing. The critical factors include the performance characteristics specified in the aircraft's operating handbook, which recommend adjustment for ice accumulation. In this case, setting the approach speed to 105 knots with ice on the airframe allows pilots to have better performance margins and aids in preventing stalls during the approach.

Other speeds provided in the options are either too high or too low, which do not align with the standard operational procedures for managing ice contamination. Situational awareness and adherence to these operational limitations are essential for maintaining safety when ice is known to be present.