HYDRAULICS Flashcards
How many HYD reservoirs are there in the system?
3
Left
Centre
Right
Which HYD system supplies the FLT controls?
All 3 systems. L, R and Center
Are the HYD reservoirs pressurized?
Yes, by the bleed air system
Which HYD system Powers the Normal brake system?
The Right HYD system
List the primary pumps for the L R C systems
Left: ENG
Right: ENG
Center: Electric C1 and C2 pumps
List the demand pumps for the L R C systems
Left: Electric
Right: Electric
Center: C1 and C2 Air driven pumps
In AUTO, when will the L and R demand pumps operate?
When there is a high demand for HYD fluid and for T/O and Landing
Which HYD system Powers the ALTN/RSV brakes?
Center HYD system
What system is supplied by the C HYD system?
- FLT controls
- leading edge Flaps
- trailing edge flaps
- Landing gear actuation
- Alt/RSV brakes
- Main gear steering
- Nose gear steering
What is the purpose of the RAT?
Used to Power the FLT controls from the C HYD system when all Power sources fails
Will both C1 and C2 primary pumps run on the ground with one Engine running?
No, only C1 will run with one Power source
Will both C1 and C2 demand pumps for C HYD system run if both are selected in AUTO?
No both pumps can’t operate at the same time. If both are selected on only C1 will operate.
What systems are isolated if C HYD system quantity is low and airspeed is above 60 kts?
- alt brakes are isolated
- nose gear actuation and steering isolated (reconnected if airspeed < 60kts or c hyd sys press low or landing gear selected down and engines and engine driven pump operate normally)
- LE slats isolated and will not operate in primary mode (reconnected if c hyd fluid recovers to normal and both engines are running)
Will the RAT deploy automatically if the C HYD system is low?
No, all 3 HYD systems have to be low
Or both engines fail and c hyd press low
Or both AC transfer busses are unpowerded
What Power sources needed for the RAT deployment?
HOT BAT BUS or
APU BAT BUS
