EFTA01195236.pdf

From: Laity Visoski To: "Jeffrey E." <[email protected]> Ce: Lawrence Visoski •r in Subject: Re: Date: Sun, 16 Aug 2015 01:54:26 +0000 Inline-Images: imageUm; image2.jpeg; image3.jpeg Jeffrey Great email description of coffin corner.. weight and altitude vs performance., Below Are comments from Cyrus supervisor at PBC Gulfstream: -Both left and right (cockpit and cabin) packs can feed the cabin silencer through some interconnect valves. -Air data computer will only have effect on auto-throttles, aileron trim and elevator trim (if autopilot is engaged). Enough autopilot input from drastic course change may lift a little flight spoiler but the plane would be banking rather aggressively from that input. So no direct spoiler control. -If you turn the right pack or right bleed air off in flight there is a cross-over duct and check valve that will open and allow the left air/pack to supply air to both cockpit and cabin. The ADC does allow the turbine bypass valve on both ACM's to open but that's at 42k feet -The left and right pack inlet valves go into high flow mode from 25 pounds per min to 26.5 PPM at 13k feet -They jump again to 28 PPM to the packs at 23k feet -So the ACM turbine bypass valves and the pack inlet valves are both altitude controlled but only the turbine bypass valve gets it altitude position from the ADC. The other has a built in aniroid on the side of the valve and senses the atmospheric pressure in the boiler mom in flight. EFTA01195236  EFTA01195237 AIR CONDITIONING N.) AIRCRAFT GENERAL Y. /OA IN %MANUAL 111 .4PERAI• , TENVILITufir CONTLOL VA; p CORK% VM.VE TONGUE 1pice AMY" an 'ACV Phoin DuceClerAMITOPATOR 5E,NO (ROI VIELLI PIACCCURtrai SEP Boa ONCE TEEM P SoDocr isca SW 4)1Am, Sue .......000 MA CHER bvPASS 00003 DARN DUCT ANtopADDR CABIN pNEvmATIC OVERTLY' SENSOR If VPIRKTURE COMIROI. VALVE UNAND Ssin•Lv Ask .COLDI CANN FROMLECT SEIKO ANNUAL TEMPERATURE COMBO. sYsTEu ■Ow A CONTROL VALVE* REAR PRESSuRE TEmPERATURECCNTRCK ■OT I BULKHEAD VALVE TOPOuE 1.3100 INSTALLED DV SICK Figure 21.10. Refrigeration Systems p  EFTA01195238 cia N q tcpo VAMJAJ. TRina 03i(ma '4 '0141!air ' '<Jul COCI0NT DUGT sinc ip 0IHbNryea MOR «1.Q PWPUril2 On COCKPISENT Dum • TEMP SOR 0 SN. tty AND sul, n 2 .--STATC r ... VENT c D CABM DUGT TEUP Se*Mil SP« 1437 µD SUB cn en CO D z CABIN DUG ANTICWA,o( CANN PHI uLIATIC OVFATEMP Sl HS0.1 Ø IVOKPrICMDAB 0 ~BI " NR . IDU) AR 6,MMB11FA1 tXCK•M f ROM til I StIWO CA0B1 0:11/111019-nnu ▪ ~MI CI FILCCM~ ~IDO MANUAL Mei PATIME COITROL VALVE' loing.<11A1MORO'. • BOI RUD HA KAR PleSUME VAlVF TCPOU U0/0“ SUILKPEAD PILE0 ØV SIC 426.1"1-0 Systems Figur. 21-10. Retrigeration  cpwo- C144 Nft nik94 2.‘ 'kr - 0: 4.02::$00.1 4 1A- ,00/9 P CS \t O 41S kcio t. viro- 4- •\ JryJt (oleo 1.0,SEW4/0 Q• O.1 _akSOP Ste stnckteDt iv' 41440.tet o ,- soe• .00P 4,0*.ckg O P. 1 0 .0 c‘‘ cfr cooe cSCP co(` SrEP PY. LOC 30' Ot-cl %tit. Oee ole &P&G' 1111 cPM 0 Ai -Laity, Honestly I doubt the bleed is your problem but only way to tell that I can think of is to turn them off one at a time in flight. And see if the problem changes_ Best is to turn both off at altitude but that is not a flight I'm going on! Cyrus Sent from my iPhone On Aug 15, 2015, at 9:30 PM, jeffrey E. <[email protected] wrote: Up to about 28,000 feet the aircraft is limited by indicated air speed (Vne), so say you can do 350 kias at ground level, you can do that all the way up to 28,000 too. Above that the limit is by Mach number (Mmo), as you continue to climb your indicated air speed and your ground speed now decline as your Mach number remains constant. However, even though you are slowing down you engines are burning less and less fuel, part of this is from the decreased IAS, but part is from the cold air. Colder air gives greater charge weight, it can be compressed more and the engines get greater thermodynamic efficiency. EFTA01195239 Eventually you reach the lowest clean IAS for your current weight, and that's as high as you are going. It doesn't make any difference how much power you could add, you still can't climb because to do so you would need to slow down or break up, and to slow down you'd have to start deploying high lift devices which increase drag and reduce efficiency. This is what's called the coffin corner, your engines are probably running near max power, you are near or at max speed and you are just above the stall. please note The information contained in this communication is confidential, may be attorney-client privileged, may constitute inside information, and is intended only for the use of the addressee. It is the property of JEE Unauthorized use, disclosure or copying of this communication or any part thereof is strictly prohibited and may be unlawful. If you have received this communication in error, please notify us immediately by return e-mail or by e-mail to jeevacationggmail.com, and destroy this communication and all copies thereof, including all attachments. copyright -all rights reserved EFTA01195240