Flight Control System Flashcards
Is there an aerodynamic feedback force to the T38 control system? If yes, explain it. If not, why?
No
Hydraulic power is used to control the T38 flight control system. The use of hydraulic power does not provide a direct mechanical connection to the flight control surfaces, thus there is no direct aerodynamic feedback
How does the artificial feel system work for the flight controls?
A system of springs for the aileron and rudder system provide a relative feel of feedback due to their position, and a system of springs and bobweights do the same for the stabilizer
Explain the rudder limiter system:
A mechanical linkage limits rudder pedal travel to set the travel limits for the rudder in certain configurations.
When the nose gear is extended 3/4 or less, rudder deflection is limited to 6 degrees. With greater than 3/4 deflection, rudder deflection is allowed the full 30-degrees
How does the trim system operate?
The trim system uses AC power to move the stick position relative to the artificial feel springs. The movement of the stick position adjusts the servo valves, releasing hydraulic pressure to the respective flight control surface, trimming the aircraft
How much can you trim the rudder with the rudder trim knob?
+/- 2 degrees in either direction
What is the stability augmenter system designed to do?
Reduce the T38s yaw tendencies
What two items must be on for the SAS to be activated?
Both the EGI switch and the Yaw damper switch
What is required for rudder trim to operate?
The SAS must be on
How does the SAS work?
Utility hydraulic pressure dampens yaw movements by moving the rudder
What is the power source for the speed brake?
The speed brake requires utility hydraulic pressure and DC electrical power
What is the difference between the front and rear speed brake switch?
The FCP has three detents in each position while the RCP is spring loaded to return to the center (OFF) position
Rear switch has priority
What does placing either speed brake switch into the centered (OFF) position do to the speed brake?
It removes hydraulic pressure from the speed brake
If you experience a DC power failure, what will happen to the speed brake?
It will freeze in its position
If there is a utility hydraulic failure, what will happen to the speedbrake?
It will creep from its last position
What happens to the speed brake below 250 psi utility hydraulic pressure?
The speed brake will not retract, even with the switch in the up position