Final answer:
Pressing the LH/RH ENG FIRE PUSH switchlight in an aircraft arms the fire bottle in preparation for fire suppression, but it does not discharge the extinguisher, immediately shut down the engine, or test the fire detection system.
Step-by-step explanation:
When the LH/RH ENG FIRE PUSH switchlight is pressed in an aircraft, it typically performs a series of actions that are crucial to ensuring the safety of the aircraft when a fire is detected in one of the engines. The correct answer to what occurs when the switchlight is pressed is option (c): the fire bottle is armed. Arming the fire bottle prepares the fire extinguishing system to release its contents, but it does not discharge automatically. The extinguishing agent is typically released by a separate action.
Option (a), the automatic discharge of the extinguisher, does not usually occur when the switchlight is pressed, as there are usually additional steps required to activate the discharge, such as pulling another handle or pressing a separate button. Option (b), the engine being shut down immediately, might be a result of other switchlight actions, but pressing the LH/RH ENG FIRE PUSH does not in itself shut the engine down. Typically, shutting down the engine would involve multiple steps like cutting off the fuel supply and possibly activating a fire handle, depending on the aircraft's procedures. Lastly, option (d), the testing of the fire detection system, would be a function that is performed during maintenance procedures, not during an emergency condition indicated by a fire.
Complete question:
When the LH/RH ENG FIRE PUSH switchlight is pressed, the following occurs:
a)The fire extinguisher discharges automatically.
b)The engine is shut down immediately.
c)The fire bottle is armed.
d)The fire detection system is tested.