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irs selectors problem (Read 5745 times)

JohnB. Full Member Offline KMEM Posts: 36 Location: Olive Branch,MS USA Joined: Jan 2^nd, 2013 Gender:	irs selectors problem Apr 8^th, 2013 at 3:01am	Print Post
	I almost always start all my flights in cold and dark. First turn on the battery then the i turn on the left fuel pumps for the apu. So when the apu is running i turn the irs selectors to align then after all 3 are aligned I switch it to nav. Maybe a minute later they start to flash align all at the same time. Is their a fix or my error?

	Yours truly,&&John
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Markoz CS Team Offline Posts: 12373 Location: Victoria, Australia Joined: Apr 24^th, 2009 Gender:	Re: ils selectors problem Reply #1 - Apr 8^th, 2013 at 8:49am	Print Post
	Do not turn them to ALIGN! Turn them directly to NAV and they will align and work fine. From the �757 Captain� FLIGHT MANUAL Part II � Aircraft Systems (cs757_manual2.pd) page 12: IRS Alignment An IRS must be aligned before it can enter NAV mode. Rotating the IRS mode selector from OFF to NAV begins the IRS alignment. The IRS performs a short power test, during which the ON DC light illuminates. When the ON DC extinguishes the ALIGN light illuminates. Alignment requires approximately 30 seconds, time frame intentionally set for quick alignment.

	Mark Fletcher PC: i7 10700K @3.8/5.1GHz \| 64GB DDR4 3200 \| 12GB RTX 4070 Super \| 32" LCD Monitor \| 1TB SSD & 2x2TB SSD \| Win 11 Pro - FSX/FSX-SE/P3D3/P3D4/P3D5/P3D6/MSFS2020 15.6" Gaming Laptop: i7 7700HQ \| 32GB DDR4 \| 6GB GTX 1060 \| 256GB SSD & 1TB HDD \| Win 10 Pro 64bit - FSX-SE/P3D4
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LOU Beta Team Offline 727,707,747,757,767= 40years of Boeings Posts: 1594 Location: Central PA, USA Joined: Mar 3^rd, 2010 Gender:	Re: ils selectors problem Reply #2 - Apr 8^th, 2013 at 3:22pm	Print Post
	Also, in RW you should not move the plane during alignment. Don't forget to enter your position in the CDU under POS INIT. 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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JohnB. Full Member Offline KMEM Posts: 36 Location: Olive Branch,MS USA Joined: Jan 2^nd, 2013 Gender:	Re: irs selectors problem Reply #3 - Apr 8^th, 2013 at 8:14pm	Print Post
	Thanks guys it worked

	Yours truly,&&John
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LOLcakes Full Member Offline Posts: 155 Location: Sydney, AU Joined: Jan 27^th, 2012	Re: ils selectors problem Reply #4 - Apr 18^th, 2013 at 8:40am	Print Post
	Markoz wrote on Apr 8^th, 2013 at 8:49am: Do not turn them to ALIGN! Turn them directly to NAV and they will align and work fine. From the �757 Captain� FLIGHT MANUAL Part II � Aircraft Systems (cs757_manual2.pd) page 12: IRS Alignment An IRS must be aligned before it can enter NAV mode. Rotating the IRS mode selector from OFF to NAV begins the IRS alignment. The IRS performs a short power test, during which the ON DC light illuminates. When the ON DC extinguishes the ALIGN light illuminates. Alignment requires approximately 30 seconds, time frame intentionally set for quick alignment. Why? The way I learnt it was that you move all three switches to ALIGN, then wait until the ALIGN light starts to flash, enter IRS position in FMC and then move switches to NAV. Are you telling me that I've been doing it wrong this whole time?


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Markoz CS Team Offline Posts: 12373 Location: Victoria, Australia Joined: Apr 24^th, 2009 Gender:	Re: irs selectors problem Reply #5 - Apr 19^th, 2013 at 3:01am	Print Post
	In the beginning I turned them from OFF to ALIGN, then NAV, but it didn't always work. So after reading about moving them from OFF to NAV to align them, I do it that way now. So if it works for you to move them from OFF to ALIGN, then NAV, then that's okay to do.

	Mark Fletcher PC: i7 10700K @3.8/5.1GHz \| 64GB DDR4 3200 \| 12GB RTX 4070 Super \| 32" LCD Monitor \| 1TB SSD & 2x2TB SSD \| Win 11 Pro - FSX/FSX-SE/P3D3/P3D4/P3D5/P3D6/MSFS2020 15.6" Gaming Laptop: i7 7700HQ \| 32GB DDR4 \| 6GB GTX 1060 \| 256GB SSD & 1TB HDD \| Win 10 Pro 64bit - FSX-SE/P3D4
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