SO1115 - Hydraulics.txt
Card Set Information
SO1115 - Hydraulics.txt
Why does the T-38C aircraft have two hydraulic reservoirs
To allow for two independent hydraulic systems
What are the minimum, normal range, and maximum hydraulic system pressure limitations
When will the hydraulic caution light illuminate
The hydraulic caution light illuminates when there is a hydraulic overtemp and hydraulic low pressure. It will NOT illuminate for an overpressure, but an overpressure will often lead to an overtemp
Can you maneuver the T-38C with the left engine frozen and the right gearbox failed
No, immediate ejection is recommended. A frozen engine produces no hydraulic pressure along with a gear box fail. With no pressure, you get not control
Which of the following statements about the airframe mounted gearbox are true
When you lose the airframe mounted gearbox, you lose the generator and the hydraulic pump. A gearbox fail to shift does not affect the hydraulics on that side
If the left airframe mounted gearbox shaft shears
the gear must be lowered with the alternate system
With 0 hydraulic pressure will you have control of the primary flight controls
The flight control hydarulic system is which side and controls what
Right, ailerons, rudder, horizontal stabilizer
The utility hydraulic system is which side and controls what
With both hydraulic systems inop, can you move the flight controls
What are the main components of each hydraulic system?
indicating and warning system
Where are the hydraulic reservoirs mounted in the engine bay
above the hydraulic pumps
How are the hydraulic reservoirs pressurized?
bleed air from the engine
The hydraulic pump is driven by what?
By the engine through the airframe mounted gearbox
When the airframe mounted gearbox fails to shift, how does this affect the hydraulic system?
No effect, the hydraulic pump compensates for both low and high engine speeds
How is the hydraulic pressure indicating system powered?
AC for each respective side
After the MASTER CAUTION and the respective hydraulic light illuminate, when will both lights extinguish?
When hydraulic pressure rises above 1800psi
What distinguishes a hydraulic overtemp vs low pressure indications?
Both will give MASTER CAUTION and respective hydraulic light but overtemp will indicate normal hydraulic pressure
If caution light illuminate due to hydraulic overtemp, when will the lights extinguish?
when the hydraulic temp drops below the high-temperature point (the temp at which the lights went on)
Will a leak in one hydraulic system affect the other?
With a leak in a hydraulic system, the hydraulic pressure ___ with control movements and eventually ___.
fluctuates wildly, drops to zero
With Low hydraulic pressure avoid ___ and then ___
avoid zero and negative-G flight, land as soon as possible
What can cause zero hydraulic pressure?
engine seizure and airframe mounted gearbox failure
With zero hydraulics, land as soon as ___.
land as soon as possible
What can cause high hydraulic pressure?
faulty pressure regulator or a line restriction
What can cause high hydraulic temp?
continued operation at high hydraulic pressure
hydraulic pump malfunction
Continued operation with high hydraulic temp will affect the flight controls how?
eventually flight controls will get sluggish and may bind
Indication of airframe mounted gearbox failure
Both genertor and hydraulic light illumination on a side
With a rudder system failure, the rudder may defelect a full __ degrees
With a rudder system failure, the rudder will reach the full 30 degree position in __ to __ seconds
Indications of rudder system failure
increasing yaw followed by a violent roll and departure from controlled flight
Can the aircraft be controlled with a rudder system failure?
only for the first two seconds, but the 30 degree deflection will lead to an accelerated stall and become completely uncontrollable
If rudder system failure in flight occurs, what actions are taken?
If rudder system failure is suspected on takeoff roll, what actions are taken?
high speed abort or ejection
What is the difference between Rudder system malfunction and flap and aileron malfunction?
Aircraft is controllable with flap or aileron malfunction
With a stability augmentor malfunction, the rudder can move a maximum of _ degrees in as little as _seconds
If in highspeed and high AOA a stability augmentor malfuntion can cause ___
an abrupt uncommanded roll
If a stability augmentor malfuction occurs, what action is taken?
turn the stab-aug system OFF
If turning the stability augmentor system off due to a malfunction, can you continue your mission?
If the yaw damper switch disengages in flight, can you turn it back on?
if you reset the yaw damper and it immediately disengages but rudder response is normal, can you continue your mission?
yes, but write it up
Indications of rudder system failure vs a stability augmentor failure
with a stab-aug failure the rudder can still be moved and the aircraft is still easily controlled
What provides the artificial feel for the flight control system?
System of springs for aileron/rudder and a bobweight for the stabilizer
Describe the flight control system path from control stick to flight controls
Movement of the control stick/rudder pedals actuates a cable system which in turn operates hydraulic servo valves of actuating cylinders for each flight control surface
How are the flight control servo valves' operation
Pressurized hydraulic fluid flows to the actuated valve to the appropriate side of the cylinder, which operates the control surface
What electrical system operates the trim?
When the trim system is actuated, what actually happens?
Electric motors move the control stick position relative to the artificial feel springs which in turn moves the flight controls hydraulically
Which hydraulic system(s) to aileron and stabilizer trim use?
Utility and flight
What two things can move stabilizer trim?
Stick trim button and takeoff trim button
What does it mean when the takeoff trim light is green?
The stabilizer is correctly trimmed for takeoff
What is the range of movement for the rudder using rudder trim?
What must be on for the rudder trim to operate?
What must be on for the stab-aug system to operate?
Both EGI and yaw damper must be on
What directly activates the stability augmentation system (SAS)?
What type of power does yaw damper require and what hydraulic system does it use?
left AC and utility
What hydrualic/electrical power does the speed brake use?
How can you get intermediate speed brake positions?
Momentarily placing either switch in the desired position and returning the switch to OFF
What position must the speed brake switch be in to allow it to "creep" up with airload pressure?
Which speedbrake switch has priority?
What would cause the speed brake to freeze in position?
DC electrical failure
What hydraulic/electrical power does NWS use?
What 2 things must happen for NWS to work?
Weight on nosegear, NWS button depressed
What happens when you release the NWS button?
Nosewheel returns to center
Utility hydraulics memory acronym
FANGS - Flight controls, Augmenter (SAS), NWS, Gear, SB
Landing gear hydraulic/electrical power?
Why do we open gear doors on after landing checklist?
Allows for preflight/postflight inspection of the gear well area
What are the 2 times you would use thelanding gear alternate release handle?
DC electrical or utility hydraulic failure
How does the landing gear alternate release handle work?
disengages electrical/hydraulics and allows gravity/airstream to bring the gear down
In what position must the landing gear handle be in for the alternate release handle to work?
What becomes unavailable if alternate gear extension is used?
The mechanical linkage rudder limiter system restricts rudder deflection to what when the nose gear is extended 3/4 or less?
The mechanical linkage rudder limiter system restricts rudder deflection to what when the nose gear is extended greater than 3/4?
What three conditions cause the gear warning (HUD, red light, aural tone) to go off when the gear is up?
210 KCAS or less, 10,000 feet or below, both throttles below 96%
When the gear handle is up, what does a red light in the handle indicate?
gear doors not up and locked
When the gear handle is down, what does a red light in the handle indicate?
all three landing gear are not down and locked
What electrical system operates the flaps?
How many right AC-powered flap motors are there?
How are the flap levers interconnected and which one actuates the electrical switch?
What stops the flaps at 60% when the lever is placed that position?
What stops the flaps at UP or FULL when the lever is placed that position?
How are the flaps connected to the slab?
Mechanically through a flexible cable in the right flap
What are the 3 functions of the flap/slab interconnect?
Reduces pitch changes with flap actuation, increases nose-down stick authority, and increases amount of slab deflection per inch of stick travel (pitch sensitivity)
Does the stick move as the flap/slab interconnect repositions the slab?
Nosewheel returns to center
What will be the indications of a flap/slab interconnect failure with flaps down?
Sudden pitchup and stall
What is the best course of action to land with flap/slab interconnect failure?
What intermediate flap setting should you use of a no-flap landing is not possible with flap/slab interconnect failure?
What does the aux flap control allow you to do?
Position flaps in intermediate positions
How can you position flaps in intermediate positions using the aux flap switch?
60% becomes the OFF detent