Hydraulic System Flashcards
How many hydraulic systems
The Global series aircraft consists of three fully independent and isolated hydraulic systems. Hydraulic pressure is used for all primary flight controls and spoilers, landing gear extension and retraction, nosewheel steering, brake systems and the thrust reversers. Each system has a primary (“A”) pump and a backup (“B”) pump. All three systems operate at 3000 psi, using a phosphate ester Type IV low-density fluid. All three systems are pressurized throughout normal aircraft operations. Systems no. 1 and 2 are each powered by an engine-driven pump (EDP) and an AC-motor pump (ACMP). The ACMPs are used as essential pumps for critical flight phase and to support the EDPs in the event of failure in flight. Most components for systems no. 1 and 2 are located in the aft equipment bay. System no. 3 is powered by two ACMPs. Hydraulic ACMP 3A normally runs continuously while ACMP 3B is used as an essential pump for critical flight phase and in support of the primary ACMP 3A in the event of failure in flight. Most components for system no. 3 are located in the left lower belly fairing area. Each hydraulic system uses a bootstrap reservoir for hydraulic fluid storage. This pressure provides a positive feed to the pumps at all aircraft altitudes and attitudes.
What is primary system
What fluid is used
Skydrol LD4
How is A system assisted
By B system when high demands are required
What is hyd 1 and 2 system
The hydraulic systems no. 1 and 2 supply hydraulic fluid of correct pressure, temperature and quantity to the systems that operate with hydraulic pressure. The hydraulic systems no. 1 and 2 are virtually identical in components. The difference lies in the services they provide and the plumbing associated with them. The majority of components, with the exception of the engine-driven pumps, heat exchangers and the priority valve, are located in the aft equipment bay. The engine-driven pumps (EDP) 1A and 2A supply the primary pressure. More hydraulic pressure is supplied, as necessary, by the AC motor-driven pumps (ACMP) 1B and 2B.
What are hydraulic components
COMPONENTS
The following components are found within hydraulic systems no. 1 and 2:
• Reservoirs – systems no. 1 and 2
• Hydraulic temperature transducer
• Ecology bottle • Hydraulic firewall shutoff valve
• Engine-driven pump • AC motor-driven pump (ACMP)
• Hydraulic filter manifold assembly
• Hydraulic pressure switches
• Hydraulic pressure transducer
• Damped check valve • Heat exchanger bypass valve
• Priority valve – systems no. 2 only
Can hydraulics be switched off
L/h and r/h hydraulics switched off via SOV panel on o/h panel flight deck
What is normal brake system press
1400 psi
What is lowest press for parking brake
1100 psi, doesn’t work
What system obd brake
Syst 2
Where is hydraulic filter manifold
Aft fuselage between engines near reservoirs
How many heat exchangers
2 left and 1 right
Left= syst 1 and 3
Right = syst 2
What is bootstrap accumulator
To supply entire system for 44 sec in case of failure
What does syst press #3 do
System press #3 supplies warm fluid to rat
Do ecology bottles check shaft seal leakage
Yes
