"AutoPilot Not Authorized" on approach
#1
On Reserve
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Joined APC: Jul 2008
Posts: 18
"AutoPilot Not Authorized" on approach
Anyone venture to guess why "Autopilot not authorized" would be on an approach (For example KCRQ), relatively flat prethreshold terrain, nothing too fancy type of approach? Why knock it off by 960' ?
thanks
thanks
#2
Might be due to possible oscillations in the LOC or GS. Same thing at KMRY IIRC.
Or maybe it's something with the equipment design, maybe not certified as stable in close.
I don't remember any funnyness on that approach though, and I've done it enough times.
Or maybe it's something with the equipment design, maybe not certified as stable in close.
I don't remember any funnyness on that approach though, and I've done it enough times.
#5
A while back at Flightsafety for recurrent, there was an ILS into MIA (dont remember which one) that has the "no autopilot below whatever altitude". Anyways, the instructor told us it was because there is a large parking lot on short final and all the cars hose the radar altimiter.
I dont know if he was full of s*&t or not?! But that was the reason he gave us.
I dont know if he was full of s*&t or not?! But that was the reason he gave us.
#7
A while back at Flightsafety for recurrent, there was an ILS into MIA (dont remember which one) that has the "no autopilot below whatever altitude". Anyways, the instructor told us it was because there is a large parking lot on short final and all the cars hose the radar altimiter.
I dont know if he was full of s*&t or not?! But that was the reason he gave us.
I dont know if he was full of s*&t or not?! But that was the reason he gave us.
Next time you fly in there, stay on GS to 960' and then see what is right in front of you on the ground. Actually it might simply rapidly rising or dropping terrain.
Autopilots doing a CAT-I should not of course even use the RAD ALT but on GPWS equipped airplane they might disconnect if the RAD ALT sensed rapidly rising terrain.
#9
It's published in case you are using the LOC.
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featheredprop
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08-05-2010 01:51 PM