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ERJ 170 HYD
Hydraulic systems questions
| Question | Answer |
|---|---|
| How many hydraulic systems are on the airplane? | • 3 Independent systems• HYD 1, HYD 2, and HYD 3 |
| What systems use hydraulic power? | • Flight controls• Spoilers• Landing gear• Nose wheel steering• Wheel brakes• Thrust reversers |
| Can hydraulic fluid be transferred between each system? | NO |
| How many hydraulic pumps are on the airplane? | • 6 total: 2 EDPs (Engine Driven Pumps) 4 ACMPs (AC Motor Pumps) |
| What are the basic components of the hydraulic systems? | • Reservoir • Pumps• Accumulator |
| What is the purpose of the accumulator? | • Helps to maintain constant pressure by covering transient demands• Helps to avoid pump cavitations |
| When will ACMP 1 or 2 automatically activate?Ground: | • Ground Flaps > 0, and• TL set to T/O, or• Groundspeed > 50 kts |
| When will ACMP 1 or 2 automatically activate?Flight: | • Flight Engine failure or EDP failure Flaps > 0 |
| What are some important items controlled by HYD 2 system? | • 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 takeoff 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? | • Back-up for the Flight controls |
| Why are HYD ACMP 3A & B pump switch positions ON & AUTO respectively? | • HYD ACMP 3A pump is primary and has no automation• HYD ACMP 3B pump is a back-up and automatically activates if ACMP 3A fails |
| What, if any, HYD ACMP will function if the RAT is the only power source? | • HYD ACMP 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 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 |
Created by:
rah170
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