Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
17 Cards in this Set
- Front
- Back
How many hydraulic systems are on the airplane?
|
3
|
|
What systems use hydraulic power?
|
Flight controls
Spoilers Landing gear Nosewheel steering Brakes Thrust reversers |
|
Can hydraulic fluid be transferred between systems?
|
No
|
|
How many hydraulic pumps are on the airplane?
|
6 total
2 Engine driven 4 AC |
|
What are the basic components of the hydraulic systems
|
Reservoir
Pumps Accumulator |
|
What is the purpose of the accumulator?
|
Maintains constant pressure by covering transient demands
Avoids pump cavitations |
|
When will ACMP 1 or 2 automatically activate?
|
Ground
Flaps >0 and T/L set to T/O or Groundspeed >50 knots Flight Engine or EDP failure Flaps >0 |
|
What are some important items controlled by HYD 2?
|
Landing gear
Nosewheel steering Inboard brakes |
|
What is the PTU?
|
Power Transfer Unit
Mechanical pump that uses HYD 1 power to provide HYD 2 pressure |
|
What is the primary purpose of the PTU?
|
To allow landing gear retraction in the event of an engine 2 or EDP 2 failure
|
|
When will the PTU automatically activate?
|
During t/o and landing with flaps >0 if
Engine 2 fails or EDP 2 fails |
|
How is single engine taxi possible if nosewheel steering is on HYD 2?
|
Releasing the parking brake activates ACMP 2
|
|
What is the primary purpose of HYD 3 system?
|
Backup for the flight controls
|
|
Why are HYD ACMP 3A & 3B pump switch positions ON & AUTO respectively?
|
3A is primary and has no automation
3B is a backup and automatically activates if 3A fails |
|
Which HYD ACMP will function if the RAT is the only power source?
|
3A only
|
|
In an electrical emergency what provides hydraulic pressure to flight controls until the RAT comes online?
|
HYD 3 accumulator
After 8 seconds the RAT will power ACMP 3A |
|
In an electrical emergency can the HYD 3 system power requirements overload the RAT?
|
No. A flow limiter valve is used to reduce flow and limits pump electrical power draw to prevent a RAT stall
|