What is the maximum speed with the window open in KIAS?

The correct maximum speed with the window open is 129 KIAS. This figure represents the airspeed at which it is safe to operate the aircraft with the window open without risking structural damage or creating significant aerodynamic issues.

In multi-engine aircraft, operating at or below the specified speed ensures that airflow does not cause excessive stress on the cabin structure, especially at higher altitudes and airspeeds where aerodynamic forces are greater. This limit is crucial for safety since exceeding it could lead to issues like increased drag or potential failure of window mechanisms.

Understanding the operational limits, including airspeed restrictions with the window open, is vital for the safe handling of the aircraft and for compliance with manufacturer specifications during flight operations.