Which landing gear positions must regulations indicate?

The correct choice highlights the importance of ensuring that the landing gear is in a safe and secure position during all phases of flight. Regulations specify that the landing gear must be indicated as being "down and locked" when in the extended position, and "up and locked" when retracted. This is crucial for the safe operation of the aircraft, as these conditions confirm that the landing gear is properly secured.

Having clear indicators for both positions is vital; it reassures the flight crew that the gear is in the appropriate configuration before landing or takeoff. This minimizes the risk of landing gear failure, which can lead to catastrophic results if a crew attempts to land without confirmed gear deployment.

The incorrect options do not encompass the full requirements or specific terminology outlined in regulations. For example, simply stating "up and down" lacks the specificity regarding locking mechanisms essential for ensuring the gear's integrity. Similarly, "down and stowed" does not accurately reflect the requirements for secure engagement during flight. Finally, "down and downlocked" does not include the critical indication of the gear's status when it is retracted. Therefore, the specific terms "down and locked" and "up and locked" present a comprehensive understanding of the regulatory requirements for landing gear indication.