HYD Flashcards
(25 cards)
The utility system supplies hydraulic power to…
Flaps Main Landing Gear Nose Landing Gear Normal Brakes Nosewheel Steering 1/2 FlightControl Boost System AR Hoses
The booster system supplies…
1/2 Flight Control Boost System
The auxiliary system supplies….
Cargo Door and Ramp Emergency Brake Emergency Nose Gear Extension Emergency AR Hose Operation Ground Tie in to Utility System
Where is the utility reservoir located and how much does it hold?
left side of cargo compartment
5.5 gallons
Where is the ground test valve located?
left aft wheelwell fairing
How many filters are in the utility system?
four
Which bus powers the suctions boost pumps (booster and utility)?
Essential AC
How many filters are in the booster system?
4
Where is the booster reservoir and how much does it hold?
right side of cargo compartment
3.1 gallons
What operates the auxiliary system?
3 phase ac electrically driven hyd pump
Which bus powers the aux system’s electric diven pump?
Main AC
Where is the Aux system located
Aft left cargo compartment
How many filters are in the aux system?
2
How much fluid does the aux reservoir hold?
5.3 gallons
Hyd Sys Pressure (Utility/Booster)
Red=
Yellow=
White=
Red=0-2450psi or>3510psi
Yellow=2550-2890psi or 3210-3500psi
White 2900-3200psi
Normal pressure based on 100% NP, flight controls neutral, suctions boost pumps ON, and nos sys. actuation.
LSGI may produce pressure as low as 2550 and is acceptable provided normal limits are met with the above conditions.
Rudder Boost Pressure
Red=
Yellow=
White=
Red= 0-2540 or >=3510 (15-100% flaps)
0-1090 or >=1610 psi (0-15% flaps)
Yellow= 2550-2890 or 3210-3500 (15-100% flaps)
1440-1600psi (0-15% flaps)
White=2900-3200 (15-100%)
1100-1390 psi (0-15%)
Aux Hyd Sys Pressure
Red=
Yellow=
White=
Red= 0-2240 or >=3510 psi
Yellow= 2250-2750 or 3210-3500
White= 2760-3200psi
Hydraulic Accumlator Preload Utility Booster Normal Brake Emergency Brake Aerial Refueling Hyd
Utility=1500 (+/-100psi) Booster=1500 (+/-100psi) Normal Brake =1500 (+/-100psi) Emergency Brake=1000 (+/-100psi) AR Hyd = 1350 (+/-50psi)
Normal Brake Pressure
Red
Yellow
White
Red=0-2240 or >=3510 psi
Yellow=2250-2890 or 3210-3500psi
White= 2900-3200
2250psi min for one brake application with normal brakes and anti skid OFF
Emergency Brake Pressure
Red
Yellow
White
Red= 0-2240 or >=3510
Yellow= 2250-2890 or 3310-3500
White= 2900-3300
2900 psi min for one application of emergency brakes
HYD SYS PRESSURE LO/LOSS/LEAK
A. ENGINE PUMPS (affected system)…..OFF (PM)
B. SUCTION BOOST PUMP switch (affected system)……OFF (PM)
Do you shut off hydraulic engine pumps for excessive hydraulic system pressure?
No, because the pressure line between the hyd pump and shutoff valve is isolated from its means of pressure control. Excessive pressure will build until the pump or line ruptures dumping the fluid into the engine nacelle.
When do you get AUX HYD PMP PRESS LO Caution?
When Aux pump is on and output pressure is less than 1000psi
When do you get HYD PMP (#) PRESS LO Caution?
When engine driven pump output pressure < 1000psi and NP above 70%
