Details Title: Hydraulic system Description: Cessna Sovereign Total Flash Cards: 51 Created: 03/25/2009 16:00:58		New Users: To study from this flashcard set, or to create your own your own study flash cards, REGISTER HERE. Existing Users: CLICK HERE. Additional Aviation Flashcards
Cards in this set: Term       How is the hydraulic pressure supplied? Definition       a) Engine driven pump on each engine   b) Electrical auxiliary pump when engine not running Term       How much pressure do the pumps provide? Definition           3000 PSI Term       Where is the hydraulic reservoir located? Definition           Tailcone Term       Why does the reservoir keep fluid under pressure? Definition           To prevent cavitation Term       What is the main accumulator for? Definition         Dumpens pressure spikes during high flow demands Term       What is the NWS accumulator for? Definition           Provides backup pressure when main DC is lost Term     How many cubic inches of fluid is the reservoir serviced with? Definition           340 cu inches Term           What is the auxiliary pump for? Definition       Primarily to set the parking brakes with engines off   or help maintaining pressure to hyd reservoir Term       Can you use the aux pump in flight? Definition           Prohibited Term       What is the unload position on the engine switch panel? Definition           Used during engine start airborne Term       What is the function of the unload switch? Definition           Open the hyd pump unload valve, and relieve pump pressure Term       What message do you get when pressing the unload switch? Definition           Hydraulic pressure low L-R will appear when pump pressure drops below 2200 PSI Term       What happens to the hydraulic system with one pump inop? Definition           System still operate normally with one pump only Term     What are the 3 gauges you inspect in the left nose compartment on preflight? Definition     From top to bottom:   Brake pneumatic bottle   NWS accumulator   Gear blow down bottle     Term       What prevents the TR's to deploy in flight? Definition           Isolation valves block hydraulic pressure to the unlock mechanism Term     What light and message do you see if the TR's are armed in flight? Definition         a) Arm will display above N1 tapes   b) T/R armed L-R Term       What lights and message do you see if the TR's are unlocked in flight? Definition         a) Unlk above N1 tapes   b) T/R unlock L-R Term       What lights and messages do you see if the TR's are deployed in flight? Definition   a) dply above N1 tapes   b) T/R armed L-R message   c) T/R unlock L-R message   d) Engine control fault L-R message   e) Emer stow switches flashes Term         What is the memory item for a TR's deployment? Definition       1) Press affected stow emer   2)  Affected throttle idle   3) Slow to 150 Kts max Term         How does emer stow work? Definition       Open the isolation valve   Provide pressure to the actuators to keep the door stowed Term       What lights and message do you see once you press emer stow? Definition         a) White "arm" above N1 tapes   b) T/R armed L-R Term       What does a closed center hydraulic system mean? Definition           Keep constant pressure to provide flow on demand Term       What system become inop when you lose hydraulic system? Definition a) Spoilers   b) Gear   c) Speedbrakes   d) T/R's   e) NWS   f) Brakes Term       How is the hydraulic volume gauge powered on the ground service panel? Definition         Main DC   Since preflight is done with batteries off, check the EICAS instead Term         At what PSI do you set the brakes? Definition           2400 PSI Term         What powers the aux pump? Definition            Main DC Term         What does hyd PSI measure on the EICAS? Definition           System pressure only, not an output of the pump Term         What does hydraulic pressure high mean? Definition           3400 PSI for longer than 10 seconds (pump doing too much) Term         Why the 10 Kts limitation during X-wind with no hydraulic fluid? Definition           No more roll spoilers Term         With no hydraulic, why landing distance multiplied by 1.63? Definition     No brakes   No anti-skid   No speedbrakes     Term         Why will you not have anti-skid with no hydraulic? Definition         Because you will have to use emergency braking, which does not have anti-skid function Term       What do the TR's require to open on the ground? Definition         a) 3 squat switches   b) Throttles at idle Term           Max reverse thrust N1 Definition             70 % Term       At what speed must the TR's be at idle? Definition           65 Kts Term       How are the TR's held down? Definition         4 locks   2 on top, 2 at bottom Term         When do the TR's need to be checked? Definition     a) 1st flight of the day   b) Flight predicated on use of T/R's for performance   c) Maintenance Term           What does arm light mean? Definition            Pressure available to TR's Term       What does unlock light mean? Definition           At least 1 of 4 locks is unlock Term       How do you get an arm light in flight? Definition         a) TR's lever up   b) Emer stow pressed Term     What is the memory item for a brake failure on the ground? Definition       a) Feet off the pedals   b) Pull and hold the emergency brake handle until stopped Term     What happens to the rudder bias when the TR's unlock light illuminate? Definition           Move to its minimum position Term       Why do you get eng control fault message when the TR's are deployed in flight? Definition       No cable to throttle   FADEC sets a miscompare between its position and the engine automatically set at idle Term       What is the sequence of valves for the TR's to be opened? Definition           Pressure/isolation valve/control valve/ unlock or deploy   "PIC" Term       What happens to the speedbrakes if you lose hydraulic? Definition         a) If retracted, they will not extend   b) If extended, they will blow to trailing position Term       Why is it prohibited to use the aux pump in flight? Definition             Cooling issues Term       What is the purpose of the isolation valve with TR's? Definition           Allows hydraulic pressure to reach the control valve Term         How is the isolation valve powered? Definition             Main DC Term         What is the purpose of the control valve with the TR's? Definition           Directs hydraulic fluid to the deploy or stow side of the actuators Term         How is the control valve powered? Definition             Main DC Term         What happens when pressing the emer stow? Definition         a) Opens the isolation valves   b) Directs the control valve to the stow position Term       Why does it take longer for the gear to come down using the blowdown Vs normal operation? Definition         Normal operation uses 3000 PSI hydraulic pressure   Blowdown uses only 1800 PSI, explaining the amount of time