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False localiser situation

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False localiser situation

Old 11th Jun 2019, 09:19
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False localiser situation

hi
General thoughts, notes and experiences of the above? Prone to certain airfields or weather conditions.RegardsPin
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Old 12th Jun 2019, 08:48
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.. which is why one uses something else to establish the fact of being on course prior to following the needle.

Years ago, I was doing some contract training work for SAA on the B732 and the sim presented a textbook false localiser for (if I recall correctly) Cape Town. It was easy to set the scene for the problem if crews were other than disciplined in their descent navigation - especially if the automatics were set for capture too early - confused a few chaps over the period - but only once on the basis of once bitten, twice shy.

Plenty of articles such as this one on the net - https://flightsafety.org/asw-article...alizer-signal/
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Old 12th Jun 2019, 16:37
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Mexico, ILS 05R gave me a false capture a few weeks ago. Since then, I leave it in LNAV until we’re established. Not much time though to get it all sorted!
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Old 13th Jun 2019, 10:55
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False courses exist on nearly all Localisers due to the design. Theyre normally around 35 degrees either side of the LLZ track. Same issue with Glide Path aswell (on a 9 degree profile normally). Alot easier to avoid these days with GNSS, however holding the same track whilst holding a really inappropriate heading should set off alarm bells.
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Old 20th Jun 2019, 15:59
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Originally Posted by Pin Head View Post
hi
General thoughts, notes and experiences of the above? Prone to certain airfields or weather conditions.RegardsPin
It happens.
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