37 Questions
What will cause the firewall valves to open in the emergency mode?
Selector switch in ARM position
When will the system not be electrically powered?
Power levers are forward of the flight idle gate
What is the function of each engine's torque switch in relation to the other engine's firewall valve?
It senses low engine torque
In which position should the selector switch be for fluid delivery to both engines?
CONT position
What will stop fluid flow to the engine during normal operation?
Low torque sensed by torque pressure switch
What is the function of AB flame retainers in afterburning engines?
To stabilize the flame
In the context of engine ignition, why would a variable area nozzle be fully closed at maximum nonafterburning power?
To achieve optimal thrust
What is the key consequence of a variable area nozzle remaining closed after AB ignition?
Flameout risk
Why are afterburner screech liners utilized in afterburning engines?
To reduce noise levels
What role does a firewall flow valve play in the operation of the Metroliner engine?
Managing exhaust flow
What is the purpose of the engine torque pressure switch in the fluid injection system?
To sense engine torque pressure and stop flow to an engine producing less than 600 foot–pounds of torque
What happens when the selector switch is in the ARM position in the fluid injection system?
Fluid cannot flow into the engine’s spray manifold because the firewall valve at each engine is closed
How does the fluid injection system indicate that each pump's pressure has reached 30 PSI?
Each pump's pressure switch closes, illuminating the pump indicating light in the cockpit
In the fluid injection system, what is the function of advancing the power levers past flight idle when the selector switch is in the ARM position?
Supplies power to the arming circuit but prevents fluid flow into the engine’s spray manifold
What action completes an electrical path to illuminate the cockpit ARM light in the fluid injection system?
Operation of two control relays
What component of the AB system is responsible for altering the engine's pressure ratio?
Control box
How is the exhaust nozzle actuated in the AB system?
Hydraulically powered by aerodynamic forces
Which component continuously operates to alter pump output until balance is restored in the AB system?
Control box
In the AB system, what causes an increase in the exhaust area of the nozzle?
Gas load on nozzle flaps
Which component of the AB system can be moved within a 90° sector for normal engine operation?
Throttle
What is the purpose of the variable area nozzle on modern afterburning engines?
Minimize the propelling nozzle area during normal engine operation
What causes the rise in pressure in the afterburner duct if the nozzles remain closed when afterburner is selected?
Turndown of the main engine turbine
How does the variable area nozzle respond to afterburner selection by the pilot?
It opens gradually in stages based on afterburner selection
What role does the firewall valve play in the engine's operating conditions?
Regulating the airflow into the engine
In what scenario would the control box be involved in managing engine operations?
During emergency mode activation
What is the primary purpose of the firewall valves mentioned in the text?
To control the flow of fluid to the engine compartment
How does the control box impact the operation of the fluid injection system?
By monitoring and adjusting fluid injection rates
What role does the selector switch serve in the context of fluid delivery to both engines?
Determining which engine receives fluid injection
In what way does an engine torque switch interact with a firewall valve?
By activating the firewall valve based on torque levels
If a fluid injection system malfunctions, what could be a potential consequence related to engine performance?
Elevated exhaust temperatures causing overheating
What is the primary purpose of firewall valves in the aircraft system?
Manage fluid delivery to the engine
In the context of engine systems, what does the control box primarily control?
Fluid injection system activation
Where should the selector switch be positioned for exclusive fluid delivery to one engine only?
Left engine
What triggers the activation of each engine's torque switch?
Control box signal
If the firewall valves fail to open during an emergency, what is most likely affected?
Fluid flow to the engines
What happens when the selector switch is set to 'Emergency Mode'?
Both engines receive maximum fluid flow
What factor is controlled by each engine's torque switch in relation to the firewall valve of the other engine?
'Fluid flow' rate
Test your knowledge on aircraft engine fire control systems with this quiz. Learn about the conditions that must be met for the control box to open the firewall valves.
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