Hydraulics Flashcards
Which components can pressurise the
GREEN System?
EDP1
&
PTU
Which Components can
pressurise the
BLUE System?
Blue Electric Pump
&
RAT
Which components can
pressurise the
YELLOW System?
EDP2
PTU
&
Yellow Electric Pump
Which components can the
Hand Pump
pressurise?
Cargo Door
actuators only.
When will the
PTU Operate?
When the difference between the
GREEN & YELLOW
systems exceeds
500 psi.
When is the
PTU inhibited?
- Aircraft is on GROUND, and
- Either: Park Brake is set,
- or NWS is in the towing position, and
- One Eng Master SW is ON, the other OFF.
- Also, it will not run within 40 secs of Cargo Door operation.
Does the RAT deploy
automatically
for any Hydraulic System
Failures?
No
What do the priority valves do?
Cut off hydraulic power to heavy users.
This preserves hydraulic power for
flight controls.
Hydraulic Reservoirs are pressurised.
Why?
This prevents cavitation at the
pumps.
Particularly at altitude.
When does the BLUE
electric pump
usually operate?
After First Engine Start
or
In flight with AC power available.
When does the YELLOW Electric Pump
normally operate?
- Switch in NORMAL Position - For Cargo Door Operation only.
- Switch in ON Position - It runs if AC Power is available.
What 4 faults cause
EDP1 or EDP2 FAULT lights
to illuminate?
- Reservoir Low Level
- Reservoir Overheat
- Reservoir Low Air Pressure
- Low Pump Output Pressure
If a FAULT light illuminates in a Pump
or the PTU pb, the PUMP/PTU is switched off.
What is the difference in sysytem response for
an OVERHEAT (fluid or pump)?
The FAULT light remains illuminated
until the system cools when
it will extinguish.
For other faults the FAULT light(s)
extinguish when the pb
is switched OFF.
Before Engine Start,
which hydraulic systems
can be pressurised?
ALL OF THEM
- Switch the YELLOW Elec Pump ON, this will pressurise the YELLOW system and GREEN via the PTU.
- Select the BLUE override pb ON, this will pressurise the BLUE system.
At what pressure is a
‘Low Pressure’
ECAM caution/Warning
triggered?
1,450 psi
Is the loss of EDP1 the same as
the loss of
GREEN hydraulics?
- NO
- The PTU will maintain GREEN pressure if EDP1 fails.
On Take-off a
Double Hydraulic Failure occurs at
90 knots.
Will this generate an ECAM warning?
No
This warning is inhibitted from
80 knots to 1,500 feet.
Which Busbar powers the
BLUE electric pump?
AC1
Which Busbar powers the
YELLOW electric pump?
AC2
or External power
(Yellow Pump is on the Ground/Flight Bus.)
Aircraft is shut down, battery switches OFF.
Can the RAT be manually deployed?
YES
Control comes from the HOT BATT Busbars
What is the normal range
of hydraulic pressure?
3,000 psi +/- 200
Following the loss of GREEN, YELLOW
or BLUE due to RSVR OVERHEAT,
LO AIR PR or LO LEVEL,
may the the system be restored for the
approach?
LO AIR PR:
System Pump/PTU as appropriate may be re-activated.
RSVR OVERHEAT:
May be restored if overheat has cooled (FAULT light out)
LO LEVEL:
System is not to be used.
The BLUE Pump has failed.
Are we required to deploy the RAT?
No
The BLUE pump has failed
&
now the GREEN (or YELLOW) System also fails.
Are we required to deploy the RAT?
YES
Which DUAL hydraulic Failure
will NOT put the aircraft into
Alternate Law?
BLUE & YELLOW
