Final answer:
Pressing the ENGINE FIRE pb on an aircraft's flight deck triggers a procedure aimed at cutting off potential fuel sources to the engine and suppressing the fire, including isolating fuel, hydraulic fluid, and bleed air, and discharging fire-extinguishing agents.
Step-by-step explanation:
When an ENGINE FIRE pb (push button) is pressed on an aircraft's flight deck, a series of critical actions are initiated to address a potential engine fire situation. These actions are designed to ensure the safety of the aircraft and its occupants by controlling and potentially extinguishing the fire. The main actions are as follows:The fuel supply to the affected engine is cut off to stop the flow of fuel which can feed the fire.The hydraulic fluid supply to the engine is isolated to prevent a hydraulic fire.The engine bleed air supply is shut off to stop the flow of hot air which could exacerbate the fire.In many aircraft systems, generator control is also switched off to the affected engine to eliminate a potential electrical source of ignition.Usually, fire-extinguishing agents are discharged into the engine to douse the fire. In some aircraft, this is achieved through releasing halon or other fire-suppressant chemicals.Specific cockpit indications and warnings activate to inform the pilots of the action taken and the status of the engine fire situation.By taking these steps, the aircraft attempts to contain and eliminate the engine fire, ensuring the safety of the flight.In conclusion, pressing the ENGINE FIRE pb is a critical response to a fire situation that helps mitigate the risk of fire spreading and causing further damage to the aircraft. Quick and decisive action, according to established safety protocols, is crucial during such emergencies.