SYS 110 - Hydraulics 1 Flashcards
At what pressure will the pressure relief valve open up in the emergency system?
3500 PSI
At what pressure does the hydraulic system in the T-6A operate at?
3000 PSI +/- 120 PSI
The emergency hydraulic system and primary hydraulic system are independent of eachother. (T/F)?
True
The emergency package contains its own hydraulic lines (T/F)
True
What are the 3 conditions that will cause an aural landing gear tone to sound?
- Gear handle not down, PCL is below mid-range, airspeed is below 120 KIAS, and flaps up/TO
- All gear not indicating down and locked w/ flaps in landing
- There is weight on wheels with the gear handle up
When is the emergency hydraulic system pressurized?
At engine start up
What 3 situations will the emergency hydraulic system be used?
- Primary Hydraulic System Fail
- Engine Failure
- BATT BUS Failure
If you would like to silence the landing gear aural tone, what conditions must be met?
Landing Flaps are not selected
b. Airspeed is above 120 kts
c. PCL is below approx 87% N1, and, the aircraft is subsequently slowed below 120 kts
When pre-flighting the aircraft, you check the hydraulic service bay. What two things are you looking for in regards to the green line that shows hydraulic status?
What does the green line tell you?
You are confirming that the aircraft green line is either in FULL AC (Accumulator Full) or FULL AD (Accumulator Discharged). If neither of those are met, notify maintenance.
The green line tells you the amount of fluid in the reservoir.
What is the white extended range for the hydraulic system (Shown on the ESD)?
1800-2880 psi and 3120-3500 PSI
Where is the pressure relief valve located?
In the Hydraulic Service Bay
If the fluid flow rate of the emergency accumulator exceeds _____, a hydraulic fuse limits fluid loss to a max volume of _____.
0.25 GPM
20-30 cubic inches or 0.5 quarts
What does the reservoir in the hydraulic system do?
It provides pressurized fluid back to the engine-driven pump to keep the pump “charged” with fluid.
What lights do you expect to see on the landing gear panel if you pull the emergency landing gear handle?
3 green, 2 red, and red handle
What does it mean if you have 3 red on the gear position indicator?
Landing gear and/or gear doors are in transit
Why would the HYDR FL LO annunciator illuminate?
Fluid levels dropped below 1QT in the reservoir.
At what PSI can the hydraulic system begin to operate the primary components after engine start?
1800 PSI
What two components are used in the emergency hydraulic system and how many times can you use them?
Land gear and inboard main gear doors, and the flaps. One time use
What type of valve keeps the emergency accumulator pressurized?
One Way Check Valve
What type of gas is compressed in the emergency accumulator?
Helium
At what PSI does the pressure relief valve open at?
3250 to 3500 PSI
When using the emergency landing gear handle, will the main landing gear inboard doors remain extended or will they retract?
They remain extended.
What is the amber caution range for the hydraulic system (Shown on the ESD)
1700-1800 PSI and 3500-3600 PSI
The airspeed sensor for the landing gear aural tone prevents warnings above ____ KIAS, with the gear hand and flaps ____ or ____, regardless of PCL position.
120 KIAS
UP or TO
At what PSI is the fluid reduced to in the reservoir and how is it accomplished?
50 PSI
A piston reduced the pressure to 50 PSI and a cylinder keeps the pressure at 50
What system components does the primary T-6 hydraulic system opeate?
a. Landing gear
b. Inboard main gear doors
c. Flaps
d. Nose Wheel Steering
e. Speed Brake
At what fluid flow rate is the emergency accumulator restricted to?
0.25 GPM
What will cause a EHYD PX LO annunciator?
If the PX in the emergency system drops below 2400 PSI +/- 150 PSI
What two conditions will cause the landing gear handle to illuminate red?
- Main gear inboard doors are not closed
2. PCL is approaching IDLE w/ Gear Handle Up
Do the hydraulically actuated main inboard gear doors share an actuator or do they each have their own? If they share one, how does it work?
The share an actuator. The actuator turns a torque tube and a bell crank.
What handle can maintenance pull if they need to release the pressure in the emergency accumulator?
T-Handle
The Nosewheel Steering system has to selectors in the selector manifold. (T/F)?
False, NWS has no selectors in the selector manifold
How long does a normal gear retraction/extension take?
6 seconds
What does it mean if you have 3 green on the gear position indicator?
Gear is down and locked. Extension/retraction of the gear and doors is complete.
What does it mean if you have 3 green and 2 red on the gear position indicator?
Landing gear inboard doors are open
What prevents the movement of the landing gear handle on the ground? How?
The weight on wheels sensor.
A downlock solenoid prevents the movement of the landing gear handle.
Where does the pressure come from for the emergency hydraulic system?
From the emergency accumulator
Is the Downlock Override Button in the RCP?
No
What portion of the hydraulic system isolates the primary hydraulic system from the emergency?
The slide valve.
How many electrical selector valves does the selector manifold contain?
5
What is the engine driven pump driven by?
The accessory gearbox
When will the HYDR FL LO annunciator come on?
- If the hydraulic fluid level in the reservoir drops below 1 Qt
- If the HYDR SYS circuit breaker is popped
- Battery Bus Failure
