Hydraulic Systems Flashcards
What is powered by the #1 Hydraulic system?
FAIREP
- Flaps
- Anti-skid Brakes
- Inboard Roll Spoilers
- Rudder (lower PCU)
- LH/RH Elevators (outboard PCU’s)
- Power Transfer Unit (PTU)
What is powered by the #2 Hydraulic system?
PROGEN
- Park/Emerg Brake
- Rudder (upper PCU)
- Outboard Roll Spoilers
- Gear (Landing Gear)
- Elevators LH/RH (centre PCU’s)
- Nose Wheel Steering
What does the #3 Hydraulic system serve as a backup to?
- LH/RH Elevators
How is the #1 Hydraulic system powered?
- Engine Driven Pump
- backed up by a standby Hydraulic pump
How is the # 2 Hydraulic system powered?
- Engine Driven pump
- Backed up by a power transfer unit (PTU)
How many Hydraulic Systems are on the Q400?
What are they?
- 4
- # 1 and #2 (main systems)
- # 3 backs up the elevators
- Alternate landing gear extension Hydraulic system
What are the minimum quantities you must have for dispatch in the #1, #2, and # 3 Hydraulic systems?
- 40% min in all 3
The #1 Hydraulic system reservoir (8 US quarts) is located where?
The #1 Nacelle
The #2 Hydraulic reservoir is located where?
The #2 Nacelle
What happens if the the Hydraulic fluid in each reservoir is above temperature limits?
The related #1/#2 HYD FLUID HOT light comes on.
The #1 and #2 Hydraulic system each have an isolation valve which is normally open. What happens if the system fluid quantity is low?
2 system:
The isolation valve closes, and the related #1 or #2 HYD ISO VALVE caution light comes on.
Hydraulic power is only available for: #1 system: - flaps - PTU - Rudder - Elevators
- Rudder
- Elevators
The Firewall Shut-off Valve will close if:
Green light = open, white light = closed
- Engine 1 or 2 PULL FUEL/ HYD OFF handle is pulled
- # 1 or #2 Hydraulic reservoir fluid quantity is low
- Hydraulic fluid overheats
The standby Hydraulic Pump is backup for which system?
1 Hydraulic system
Standby Hydraulic is an AC motor powered by?
The right 115v AC Bus
When does the Standby Hydraulic Pump operate automatically?
- # 1 engine fails in flight, or
- # 1 reservoir is not empty, and
- Park brake is off, and
- Flaps are set to more than 0 degrees, and
- AC power is available
Note: the standby hydraulic pump flow rate is less than the EDP, thus services will operate at a slower rate.
Note: When the standby hydraulic pump operates automatically, the green ON legend does not come on.
A priority valve is included in the #1 Hydraulic system and is normally open. If the Hydraulic pressure in #1 system decreases below 2100 psi….
The priority valve closes. This shuts off Hydraulic power to the flaps and PTU. Hydraulic power is maintained to the elevators, rudder, inboard spoilers and brakes.
The PTU is a backup source to which system?
How does it operate?
2 Hydraulic system
The PTU uses Hydraulic pressure from the #1 system to power the Hydraulic motor. The motor then operated the Hydraulic Pump to pressurize the #2 system.
Hydraulic fluid is not shared or transferred between #1 and #2 Hydraulic systems during PTU operation. Hydraulic pressure must be available in the #1 and #2 system for PTU operation.
The PTU may be operated manually or automatically. It automatically operates if:
- # 2 reservoir is not empty, and
- park brake is off, and
- Flaps are set to more than 0, and
- # 1 EDP pressure is more than 2,400 psi
What does the #3 hydraulic system power?
- It is an independent system which powers the left and right inboard elevator PCU’s.
- The system operates automatically if the #1 and/or #2 hydraulic systems lose pressure or if both engines fail.
Where is the alternate landing gear hydraulic reservoir located?
- Lower right nose compartment
What is the minimum hydraulic quantity for dispatch?
- 40% in all 3 systems
Where is the standby pump pressure indication?
- MFD 2, scale indicates from 0-4000 in 1000 psi increments.
Where are the PTU pressure indications displayed?
- There is no pressure monitoring when the PTU is selected on manually. Thus, the green ON advisory light, on the PTU CNTRL switchlight, must be monitored when the PTU has been selected on.
When does the #1 hydraulic system priority valve close?
A priority valve is included in the #1hyd system and is normally open
- If the hydraulic pressure in the #1system decreases below 2100 psi
- This shuts off hydraulic power to the flaps and PTU. Hydraulic pressure is maintained to the elevators, rudder, inboard spoilers and brakes.
