757_Pneumatics.docx - 9 3-757:72 System Description...

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Unformatted text preview: 9:; 3-757 :72; System Description Location of Components Introduction Airforfl'lo pnourroticsystom con bosuppiiod by: I aground ojrsourco I firoAF‘U I firoongirros. F'riorto ongirrostortfl'ro APUorgrourlzl sourco suppiiosfl'lo systom, oftororrgirro start, tho mginossupphr blood oirfor prlournotics. Switchoson fl'lo Blood A'rConiIol F'orloi oporototho AFU and ongirro blood o'r supp-hr systom. This ihstrotosflro locofion ofcompononis intho Pnourrofics systom. All common-us PACK iPIoHTI “HGT” “HE S'I'lrFITEFI ROBE MT” EIIEIIEAII WPPL'I" Sm!- moo All surrur 51mm SUPPLY 5W CMHEC'TDH corruzc'rorr mimo- Prllllnliichir Tho fiflbwirq systorr'ls role; on prrourr'loticsfor oporofion: I ojrumditionirgrprossurizofim I wing ondorrg'noonfi-ico I ongirro crossstorh'rrg I hydraulic rosonoirprossuro. Qt: B-757 Ground Pneumatlc Supply 36.1fl2 Juana: In'huducfinn 'IMIm qumda'risavaidala, 'rtsmpliasa'rfurgrmrfl mamatbfumfims. T113113 are tum grumda'rsupplyctmnadus: . mean the lafi pmunatbduct . mean the right munathdlm - bufl'l mmdhrfia’a mmmdfldfflrm packupamt'nn Huh: Tum a'r madam quL'radfurandna start. uriassasingh cart is hid-1 trauma output. APLI Bhdflr THsihst'atasfilaAF'U amply-mg a'rfurpnmrrafits prhrtuangha stilt “HON": “mum ELEED Mn III I I |' . -._ EU ant-I... ' uu Ll'l' fwd} PRESS . nu 9.. IDLAHDH IIIIDUHD PNEUMI‘HG I ma ANTI-BE HWIIAUIJF IEEEFMJHE ®ua PH EIJHATICS B-757 3“: APU Bleed Air Surlpllzllr Intmdmtion During “In an During Engine Start I III-flight The APU isoonneoted to file pneurrafio system fl'lrough ‘lZl'lfl AF'LI bleed air valve. F'ush'ng the APU Bleed Air switch 0N, sendsanopen signal to file valve. The APU can provide bleed a'r boH'I on ‘lZl'IB ground and in-fiight. However, it is used pr'l'narilvasa ground pneurratiosouroefora'roondifion'ng paolLoperalJ'on and engine starfing. ln-fiight, APU air is avaihblefor I'rnited use. {See In-fl'ght below.) During APUstart, ‘lZl'lfl AF'Umt'ol o'l'ouitalmvstheAF'U bleed airvalve toopenwhen the APU reaches norrnal operat'ng speed. The VALVE disagreement light ihn'l'nates mornentariv wl'lilethe Inaive is in tIansit. With tl'fl AF‘U bleed valve open: I APU air is suppied to file pneurrafitsonthe lefiside. lffl'le isolalJ'on valve is open: I APU air firms 'nto boH'I sidesfora'roondifioning paolL operation or engine start. To prevent engine bleed air from back pressuring fl'le AF‘U: I a d1eoltvalve is located in file AP'LI duct, and I tl'lfl AF‘U bleed air valve auton'latioaI}.r oloses. - Automatic olosureofthe APU bleed a'r valve depends on the relative position of engine bleed airvalves andthe isolation valve. The APU bleed valve sensesflle positionoflhese valves and olosesautorrafitalv when an engine bleed airvalve opens. - lffl'le isolalJ'on valve is dosedthe AFU valve looks at the leFt engine bleed valve only. F'neurnatiosare avaiable up to an allitude ofapprox'rnatelv 1?,Eflfl feet. BarometriooonlIol trFAPUoonpmmts-autcmnatballvreduoesAF'U pneurratio pressure output and results 'I1 'nsuFFioient pressure for oabin pressurizafion above EDDDD feet. I This is toensure sufficient generator outputto rneet elect-ital derrands without merloading fiIeAF'U. @111: PIEUIATIH B-757 Englne Bleed Alr Supply In‘h'udllcfinn 35.1114 11:12:11.1“ The left and rig-Itangha blaad a'rmppiasara sirn'hr. THsilust'atas HIE mails blaad a'r mppias afiarmgila start BLEEI3|l AIR ". I 'I .I' ._IE-fl an], an, 3:352; _.21} .0“- IEDLATIDIHII L'H'IIG ANTI-ICE ”EMILE: RESERVE-Ina- GROUND FNEUHRTIB H WING MTI-I'JE HTDHAULIG FIESEFWWE @ua PH ELIIATICS 3-757 :32: Engine Bleed Air Supply [continued] lntmdmtion Engin- BIIIdAir Valves isolation Valve Duct Pressure ErlgirlIAnti-iol Engirle bleed a'rfor the pneumatic system comes from eithertl'le: I high pressure {HF‘l‘pergirle compressor section or I low pressure {LF'1engirle oompressorseotion. Durirg engirle lowthn.lstoperatjorl, ‘lZl'Ifl HF' valve is open allow'ng high pressure airto powertl'lesystem. fistl'lmstisirlcreased, tile HF' valve autorratJ'caIy modulatesth the closed position, allowirg tl'le LF'checlc valveto supply bleed a'r. At high altJ'tr.lcleI the HF' valve modulates tovuard open to ensure adequate pneurratic pressure is avaiable for systems requ'rirg it. The bleed airficnvstzl'lrocgh ‘lZl'Ifl erg'ne bleed airvalvefor pressure oontIolarldthen 'I1to pneumatic ductirg fibrdistribution tothe bleed a'r users. Erg'ne bleed airval'ves are: I electJ'icaIy controlled by tile Erg'ne Bleed Air switches arlcl I pressure actuated. Theretbre, even tl'locghthe valves are signaled open priortotheerghestart,tl1eywil rerra'n closed unti tl'leerg'ne is runnirg. Tile Engine Bleed AirOFF lights traclc tl'le po-sitionoftl'le erg'ne bleed a'r valves: I ilum'natjrg anytime the associated valve is dosed I extjrguishirg when bleed air pressure opens the valve. Engine bleeda'rfblvstl'lroLghthe lefiarld rght prleumaticductsto tl'lesyatems requ'rirga'r. Norrralfight procedures requ're isolatJ'rg tl'leerg'ne bleed a'r supplyinto left arlcl right systemsaf'tererghe start Each engine supplies alrto its corTesporIdirg: I airoorlditionirg pack I wirg anti-ioeductirg and I to aoorrrnon manifold fortlle hydraulic: reservoirs. Tile two sides are oorlrleoted by a rranifold. Separation oftl'le left and right sides is oontIoIed bytlle operation oftlle isolation valve intlle manitbld. Thisvalve ismntIolled by 'lIl'lfl ISOLATION switch. The Pneurratjc Duct Pressure Indicatorsl'lowstl'le pressure intlle lefiarld right pneumatic ducts. These pressures should be approximately equal. Bleeda'rtbrerg'ne oolvl antlioe istalten from downstream oftl'leerg'ne bleed a'rvalve on each engine. @ua PIELIHATIBS 36.1113 3-75? cam, in: Non-Nontral Indications Ho Engine Bind Air Duct Air Overpass III'I Duct Air Overtunporlturl DuctAirLrI-Ik APLI Bind Valv- Disagrlllnont Isolation Valv- Disagreement lfti'leeng'ne bleed air I.rslve is closed, no bleed a'r is flowing from ti'leeng'ne result'ng 'I1. I the EICAE advisory message L or R ENG BLEED OFF being displayed I the Eng'ne Bleed Air OFF light ilkrn'l'nat'ng. An overpressure ofan engine bleed system causes the associated HF' bleed a'r valve to be automatically locked closed result'ng in: I the EIGAE message L or R ENG Hl STAGE being displayedand I tile associated HI STAGE light ilkrn'l'nates. This locked valve cannot be unlocked whiea'rborne and requires maintenance action t'orcu'reotion. Hmvever, LF' air cont'nuesto fiowtothe affected side. Theengine bleeda'rtemperature exceeding the maximum temperature l'rnitcausesti'le associated engine bleed air'Iralve and the HF' bleedto automaticallyclose result'ng 'I1: I the EICAS caution rnesmge Lor R ENG BLEED "I.I"ALto be displayed and I the iIuminationoftiIe assoc'ated engine BLEED light. The system [an be reset and the valves enabled to open byselecting the associated eng'ne bleed air switch OFF ti'len 0N. Bleed air leak detection along the pneumatic ducts is provided by leak detection loops. The loopsareoontinuous elements that activate whena bleed air leak is detected. Activation oFan element causes: I the EICE caution rnesfige Lor R BLD DUCT LEAKtoappearand I the associated DUCT LEAK ight to iIuminate. The leak must be isotatedandtile bleed souroetur'ned of'fto preventsti'mturaldarrage. "Mlen the temperature has cooled sufficientiy, ti'le mesflge disappears and light extinguishes. Disagreement between time positionofti'le AF'U bleed airvalve and itssignaled position muses: I the EICAE advisory message AF'U BLEED "I.I"AL and I AF'U 1I.I"AL‘I.I'E light to ihm'nate. Disagreerrrent between the position oftile isolation valve and the switch causes: I the EIGAE advisory message BLEED ISLN "v'AL and I ilum'nation of the isolation "I.I"AL"v'E light. 63:: B -757 :1: Controls and Indicators Location of Controls and Indicators Introduction T his illst rates filo pom rrafio system oonIIoIs and 'nditatona. Iotatod 'n filo fight dock. BLEED “II I._ | I .' -.__I 5D aa' ..- —}k_._ 5:543 $0 ”it .- . I ' ISOLATION g; B-757 3i“: Bleed Al r Central Panel h‘huducfinn Tll'eihst'atflsfila Blafldh'rCurltrul Pflmllutatfld werlmd hfilafiight deck. BLEED AIH I". I I .I' EL'EU an“; DUCT 7.4%; PHE55 }. 20 .. ." l' I I D IsaLATIM 'I H ...
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