Final answer:
The landing gear horns on an aircraft will typically activate in three main situations: when the landing gear is not deployed and the aircraft is at a low altitude, if there is an unsafe condition in the gearbox, and if the horns are manually activated by the pilots to signal an issue.
Step-by-step explanation:
The original question seems to be about when the landing gear horns (or warning horns) will activate on an aircraft, which is a safety feature to alert the pilots of potential issues. However, the provided scenarios involve everyday street scenes rather than aviation-related situations and do not pertain to the functioning of landing gear horns. To address the intended question, here are three situations where the landing gear horns may activate on an aircraft:
- Landing gear not deployed: A warning horn will sound in the cockpit if the aircraft is at a low altitude or a certain configuration is met (like flap deployment) and the landing gear is not fully extended and locked for a safe landing.
- Unsafe gearbox: If the landing gear's position does not match the selected position (up, down, or in transition), indicating an unsafe condition for the gearbox, the horn may sound to alert the crew.
- Manual activation: Pilots can manually activate the horn to test the system or to alert the crew to an unsafe situation regarding the landing gear that is not otherwise automatically triggered by the aircraft's systems.
These horns are part of the aircraft's safety protocols to ensure the crew is warned about potential landing gear issues before landing.