Comments on: So You Fly RNP-0.1 ? That Don’t Impress Me Much ! http://www.plasticpilot.net/blog/2008/05/16/so-you-fly-rnp-01-that-dont-impress-me-much/ General Aviation and Aviation In General Sun, 14 Mar 2010 09:23:43 +0100 http://wordpress.org/?v=2.8.5 hourly 1 By: PlasticPilot http://www.plasticpilot.net/blog/2008/05/16/so-you-fly-rnp-01-that-dont-impress-me-much/comment-page-1/#comment-3306 PlasticPilot Mon, 19 May 2008 15:21:04 +0000 http://www.plasticpilot.net/blog/2008/05/16/so-you-fly-rnp-01-that-dont-impress-me-much/#comment-3306 As far as I know, the VOR and ILS monitoring is based on receivers (a.k.a. monitors) located near the station. If the received signal is not as expected, the control system switches to the second transmitter. If the problem is not solved, the system automatically switches the transmitter off. This offers relatively good protection against transmitter problems, or local interference, but nothing prevents wider range disturbances. Hearing and checking the morse code is also kind of an integrity check, but it's not that robust. As far as I know, the VOR and ILS monitoring is based on receivers (a.k.a. monitors) located near the station. If the received signal is not as expected, the control system switches to the second transmitter. If the problem is not solved, the system automatically switches the transmitter off.

This offers relatively good protection against transmitter problems, or local interference, but nothing prevents wider range disturbances. Hearing and checking the morse code is also kind of an integrity check, but it’s not that robust.

]]> By: fred http://www.plasticpilot.net/blog/2008/05/16/so-you-fly-rnp-01-that-dont-impress-me-much/comment-page-1/#comment-3302 fred Mon, 19 May 2008 11:06:40 +0000 http://www.plasticpilot.net/blog/2008/05/16/so-you-fly-rnp-01-that-dont-impress-me-much/#comment-3302 well, I'm not a specialist to answer ... well, I’m not a specialist to answer …

]]> By: PlasticPilot http://www.plasticpilot.net/blog/2008/05/16/so-you-fly-rnp-01-that-dont-impress-me-much/comment-page-1/#comment-3284 PlasticPilot Sun, 18 May 2008 16:35:18 +0000 http://www.plasticpilot.net/blog/2008/05/16/so-you-fly-rnp-01-that-dont-impress-me-much/#comment-3284 Fred, I agree that accuracy monitoring is a serious challenge, as it is in any ground navaid equipment. However, knowing how VORs and ILSs are monitored (couple of monitors at known positions), cross-checking a GPS position with inertial or other positioning system does not seems like a big deal to me. But I could be totally wrong ;-) Fred, I agree that accuracy monitoring is a serious challenge, as it is in any ground navaid equipment. However, knowing how VORs and ILSs are monitored (couple of monitors at known positions), cross-checking a GPS position with inertial or other positioning system does not seems like a big deal to me. But I could be totally wrong ;-)

]]> By: fred http://www.plasticpilot.net/blog/2008/05/16/so-you-fly-rnp-01-that-dont-impress-me-much/comment-page-1/#comment-3282 fred Sun, 18 May 2008 15:54:24 +0000 http://www.plasticpilot.net/blog/2008/05/16/so-you-fly-rnp-01-that-dont-impress-me-much/#comment-3282 What is new is the ability to monitor the accuracy and alert the crew if RNP capabilities decrease. This is what differentiate RNP from basic RNAV. The challenge is there. By the way, RNP1 is a 1 NM precision 95% of the time, not 99,999%. fred What is new is the ability to monitor the accuracy and alert the crew if RNP capabilities decrease. This is what differentiate RNP from basic RNAV. The challenge is there.
By the way, RNP1 is a 1 NM precision 95% of the time, not 99,999%.

fred

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