From: Laity Visoski To: "Jeffrey E." <jeevacation@gmail.com> Ce: Lawrence Visoski •r in Subject: Re: Date: Sun, 16 Aug 2015 01:54:26 +0000 Inline-Images: image Um; 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 AIR CONDITIONING N.) %MANUAL 111.4PERAI• , CONTLOL VA; p (ROI DuceClerAMITOPATOR PIACCCURtrai VIELLI SEP Boa ONCE TEEMSoDocr P isca SW 4)1 Am, Sue DARN DUCT ANtopADDR CABIN OVERTLY' pNEvmATIC SENSOR CANN ANNUAL TEMPERATURE CONTROL VALVE* AIRCRAFT GENERAL Y. ENVILITufir T CORK% VM.VE TONGUE 1pice REAR PRESSuRE INSTALLED DV SICK BULKHEAD /OA IN AMY" an 'ACV Phoin 5E,NO 000 ....... CHER MA 00003 bvPASS If VPIRKTURE COMIROI. VALVE Ssin•Lv Ask FROMLECT SEIKO COMBO. sYsTEu VALVE TEmPERATURECCNTRCK TOPOuE 1.3100 Figure 21.10. Refrigeration Systems p UNAND ■Ow .COLDI A ■OT I EFTA01195237 q N cia VAMJAJ. TRinatcpo 03i(ma DUGT COCI0NT sincip 0IHbNryea MOR On PWPUril2 «1.Q COCKPISENT Dum 0 • TEMP SOR SN. tty AND sul, Dc 2 n CABM DUGT TE UP Se*Mil cn SP« 1437 µD SUB z D CO en CABIN DUG ANTICWA,o( CANN PHI uLIATIC OVFATEMP Sl HS0.1 CA0B1 MANUAL Mei PATIME COITROL VALVE' KAR PleSUME PILE0 ØV SIC 426.1"1-0 SUILKPEAD Figur. 21-10. Retrigeration Systems '4 '0141 !air ' '<Jul r .--STATC ... VENT NR f ROM til I StIWO 0:11/111019-nnu loing.<11A1 MORO'. VAlVF TCPOU U0/0“ Ø 0 ~BI " IVOKPrICMDAB . IDU) AR 6,MMB11FA1 tXCK•M ▪ ~MI CI FILCCM~ ~IDO • BOI RUD HA EFTA01195238 'kr - 0:4.02::$00.1 cpwo- C144 Nft nik 94 2.‘ 4 1A- ,00/9 P CS •\ O 41S kcio t. viro- 4- \t 1 .00 _akSOP stnckteDt iv' et,- e• 41440.to so Sr EP LOC JryJt (oleo SEW Q• 1.0, O.14/0 Ste ole &P&G' 0 cPM .00P 4,0*.ckg O P. cfr c‘‘ coo e cSCP co(` PY. 30' Ot-cl Oee %tit. 1111 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. <jeevacation@grnail.conp 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