757_Hydraulics.docx - ~= B 757 HYDRALLIGB mm m System...

Info icon This preview shows pages 1–10. Sign up to view the full content.

Image of page 1

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

Image of page 2
Image of page 3

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

Image of page 4
Image of page 5

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

Image of page 6
Image of page 7

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

Image of page 8
Image of page 9

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

Image of page 10
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: ®~= B 757 HYDRALLIGB - mm. m System Components Intmdllctiun This diagram ihstratas fl'la hydraulic: firsts rm. NIGHT ETE'I'EI m "I m m but! un m» man I‘ll“! m me BIKER IMIEB- G“. B 7 7 29. 11.1.3 HYDRALLIGS - 5 Jan so, in fists-m Components [Continued] Ger-ere] The aircraft isequipped wifl'lthree separatearld 'I1deperldent hydraulicsystems: I LEFT I lIBEMTER I RIGHT These tl'll'flfl hydrauliosystems provide powerto tile thrust reversers, brakes, autopiot servos, fight oontrols,1’epstslats,|andirlg gear, and nose wheel steer'ng. Reservoirs The LeFL Center, and Right systems each have an hdependerrt reservoir. The reservoirs : I are pressurized by bleed airto ensure positive fluid flow I omtaina standp'pe to maintaina reserve amount of hydrauio fluid in tile eventofa system leak I are equipped lvitha quantity measuring systemto provide information to tile EIGAS status display for quantity and refil 'nditsfiorls I are provided wifl'la Low Quantity ightthatilumirlates {REJanvhen filefiuid quantity reaches orler'haiF full arldr'or bieeda'r pressure is low. Tile hydrath fiuid quantity on EIGli-‘E statusdisplays' I 1.00 whenthe reservoirfiuidquantity isfullyservioed I 0.?5 lvi'lenthe reservoir is 34 full and dispblys RFILrefill} as a ren'l'rlder I 0.20 approximately when standpipe fluid is auaiable. Pllnps The Lefiarld Right systemsar'eeaoh powered by: I oneerlg'ne-driven purrp I and orle eleob'iodrivm pump. The Leftsystem fiapsl'slats, hrld'ng gear, and rlose wheel steering can also reoeive power from file right hydrauliosystem fl'lrougha Power Transfer Unit {F'TLI}. The lIiieunter hydraulic system is powered by. I tlno elem'io-driven pumps. Ifrequired, a Ram AirTurbirle {RAT} can poll-erfl'le oenter hydrauio system. System Pressure The Left, Center, and Right systems each provide: “9'“an I pressure infonTation to the EGAS status display I a LtsIv pressure light to 'rlditste when system pressure is low. Qua; 3-757 .517: Left hydraulic System Intmdmtiun This diagram ihstratas the left hydra ulit: system ache mafia. EIBAB STATUE DISPLNI' PRESSURE TMNB-III'I'I'EH TflFlJuP'Sl'E-LA'I'B. LMII’IIIE GEM. HDEEWHEEL STEERIN- Mlfl HIMI [WI TO "SING Gfl-IP'DIIEHTi PHEHUR‘E TRIKE-I111! @r... HTDRALLIGS 3-757 .51: Left Hydraulic System [Continued] Fluid Supply Engine-Driven Electric-D risen PowerTnnsfer Unit Tile left system resenro'r has astandpipeto mainta'n reserve hydraulicfhfl for use by the Power Transfer Unit 'n the eventof a left system hydraulic leak. Fhid forthe enginedriuen pumpflo'insthrougha shut offyalveoonti'oled hythe Left Engine F'I'e switch. Pul'ngthe fre switch: I shuts offthe flow of fluidto the pump I depressurizes the pump. The eng'ne-driuren purrp isthe primary poser souroeforthe left hydrauic system: I the engine pump can be depressurized with the eng'ne mnning by tuming offthe Engine Pump switch I low pump output pressure is 'ndicated bythe Eng'ne Pump Low Pressure fight I an engine purrp overheat is 'ndicated by the Eng'ne Purrp Duerheat ight. An electric-driven pump also powers the left system: I the Electric Pump switch contmls the pump I low pump output pressure is 'ndiceted bythe Electric Pump Low Pressure fight I an overheat is 'ndicated bythe Electric Pump Overheat fight. The Power Transfer Unit {PTU} isa hydraulic motor pumpwhichtranst'ers hydrauic power from the right systemtothe left system. The PTLl isautomaticallyaotiyated: I ifthe left engine t'ailsor I the left engine purrp pressure is low. When activated, the PTLl augments the left hydrauic system electric pumpto operate: I the flapstshts I hnd'ng gear I nose “heelsteering I Hydraulic Motor Generator {HMS}. 53305. series only. See Electrical section for description. PTLl operation is 'nhibited ifthe righteng'ne is notoperat'ng - right electrical hydrath pressure only is 'nsufficient pressure to drive PTLl. Witi'l left hytlrauic system imperative, and with the PTLl operat'ng, system pressure information is arraihble on ECAS status disphy. "9:; 3-757 37: Right Hydraulic System Intmductinn This. diagram ihstatas file right hydra ulit: system ache rrat'c. EICAS STATUS IIIISPLA‘Ir FfiEfisuHE TIMER TO UBIIE DGIIFDHEH'I'S- HOLA'I'ION 'I'D BRAKES GEBMWG @ua HTDRALLICS 3-757 :2: Right Hydraulic watt-m [Continued] Fluid 5 apply Engine-Driven Electric-D riven Reserve Brakes The right reservo'r hasa standp'pe to maintain reserve hydrauicfiiid for use bythe reserve brakes. Fhid forthe engirledriven pumpflowsthrougha shut oFFvaiveoontIoIed bythe right Engine F'I'e switch. Pul'ngthe fi'e switch: I shuts ofithe flow offiuidto the pump I depressurizes the pump. The eng'ne-driven purrp isthe primary power souroe for the right system: I the engine pumpcan be depressurized with the eng'ne operating bytuming offthe Engine Pump switch I low pump output pressure is hdicated by the Erlg'ne Pump Low Pressure fight I an engine purrp ouerheat is hdicated by the Eng'ne Purrp Dverheat Ight. An eleob'iD-drivm pump also powers the right system: I the Electric Pump switch controls the pump I low pump output pressure is 'ndicated by the Electric Pump Low Pressure fight I an electric output pump overheat is indicated bythe Electric Purrp Ovetheat light. Activating the Reserve Brakes switch: I signals the electric pump to operate regardlessofthe Electric Purrp switch position I opensthe supply valve which allows use ofthe reserve hydrauliofklid I closesthe isolation I.ueltle which ailmns the electric pumpto power the rlom'al brakes exchsively. Gt; 3-757 :7: Center Hydraulic System Intmdmtiun This diagram ibstrates file [31% hydrauit: system sd'lemat in. ME“ RAII AIR TUBE EICAS STATUS DISP LNIIr Emfll IE @ua HYDRALLICS B-757 “LL Center Hydraulic fists-m [Continued] Fluid Supply Electric-D riven LondShed Run Air Turbine Automatic llhnnal Extension RtetrIchn Tile center reservo'r hssa standpipe to rrIainta'n reserve hydraulicfiuidfor use bythe Ram A'r Turbine {RAT}. Two electi'iodriven purrps power the center system I the Center Electric Pump switd'les No.1 and Econti'olthe purrps I low pump pressure is indicated bythe Electric Pump Low Pressure light I an electric purrp overheat is 'I1dicated byti'le Electric Pump Querl'leat ight. When there is only a single power source {AP Ll, external potter, or one engine generator} and both Electric Purrp switches are ON: I the No. 2 electric purrp operation is inhbited to reduce electric loads The Ram AirTurbineiRAT} hydraulic pump is located in the body t'a'rirlg afiol‘ti'le right man gear. The UNLKD lightntan'ber} indicates tile RAT is not locked in tile stowed position. At speeds above 130 knots: I the RAT provides adequate power tbr normal center system operation I a Ram A'r Turbine Pressure light {green} indicatesthe RAT is pmviding hydraulic power. Infight, ti'le RAT autcmatically deploys 'nto ti'le airsti'eamwhen: I both erlg'nesfail. - The RAT ti'lensuppies hydrauic ponertothe centersystem. Manualextensicnofti'le RAT is' I provided by tile guarded Ram Air Turb'ne switch I available anyt'rne the switch is activated I powered by the Hot Battery Bus. Once extended, the RATcan only be retrsctedontlle ground. G"; B -757 :11 Controls and Indicators Looatlon of Controls and Indloators Inhoducfion Thomanunborofmt'dsa'fl irfltfltmassooiatodw'rfl'l ‘H'Ifl hytkmiosystoms This ciaqarn ihstratosfl'lo'r Iooah'on in the flight dark. III .Ill'l'lulflB H‘I'D PUIFB- G 1-ELEH |}.'|"5 1.I2II2I 1.|IH] Ell-HI 2am :Illllll GZSUD‘I EC ...
View Full Document

  • Summer '15
  • chris

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern