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Taxi Check - #2 L & R bleed closed (Read 5994 times)

KrisJ Full Member Offline Posts: 33 Joined: Jan 11^th, 2010	Taxi Check - #2 L & R bleed closed Dec 26^th, 2012 at 8:22am	Print Post
	Item in the Taxi Checklist says to close number 2 left & right bleed air switches. Do we open them back at any point of taxi or flight? Thanks, Kris


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Markoz CS Team Offline Posts: 12445 Location: Victoria, Australia Joined: Apr 24^th, 2009 Gender:	Re: Taxi Check - #2 L & R bleed closed Reply #1 - Dec 27^th, 2012 at 2:31am	Print Post
	You turn them back on after takeoff (which should be on the After Takeoff Check List). Not turning them back on leads to a pressurization warning horn when you reach 10,000 feet!

	Mark Fletcher PC: i7 10700K @3.8/5.1GHz \| 64GB DDR4 3200 \| 12GB RTX 4070 Super \| 32" LCD Monitor \| 1TB SSD + 2TB SSD + 2TB HDD \| Win 11 Pro
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KrisJ Full Member Offline Posts: 33 Joined: Jan 11^th, 2010	Re: Taxi Check - #2 L & R bleed closed Reply #2 - Dec 27^th, 2012 at 9:12am	Print Post
	Got it! Thanks! I am exploring 727 once again...


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LOU Beta Team Offline 727,707,747,757,767= 40years of Boeings Posts: 1610 Location: Central PA, USA Joined: Mar 3^rd, 2010 Gender:	Re: Taxi Check - #2 L & R bleed closed Reply #3 - Jan 1^st, 2013 at 8:07pm	Print Post
	The reason to close the 2 left & right bleeds is to isolate the two sides. The #2 bleed switches are used on the ground to provide air from the APU for A/C and start air and if and engine fails or there is a bleed trip from �engine 1 or 3. The number 1 & 3 bleeds have different sub systems than the number 2 engine bleeds. Engine 1 & 3 have a high pressure modulating valve to supply air when is at low power settings. Normally eighth stage is used with 13th for low thrust settings. Engine 1 & 3 have high stage available, # 2 only has 4 stage air. Engine 2 is normally not used for bleed air to the A/C system. Sorry for the poor quality of the screen capture. Lou Uploaded with ImageShack.us

	Processor: Intel Core i7-4770k @3.5Ghz Memory: 6Gb DDR3 1600mhz Video: NVIDIA GeForce GTX 680 Storage: 256Gb Samsung 840 Pro \| 120Gb OCZ Agility 3 \| WD Black 640Gb 7200rpm 55" Samsung LED - HDTV for monitor
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Markoz CS Team Offline Posts: 12445 Location: Victoria, Australia Joined: Apr 24^th, 2009 Gender:	Re: Taxi Check - #2 L & R bleed closed Reply #4 - Jan 2^nd, 2013 at 6:14am	Print Post
	Thank you for that explanation of how it all works Lou. Now all I have to do is get my head around it. But...at least it's not as complex as the fuel management for the 707!!!

	Mark Fletcher PC: i7 10700K @3.8/5.1GHz \| 64GB DDR4 3200 \| 12GB RTX 4070 Super \| 32" LCD Monitor \| 1TB SSD + 2TB SSD + 2TB HDD \| Win 11 Pro
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