2 NDB.
Hello everyone! Just a simple question for you! 2 NDB on approach chart and Std mnms. What does it mean? As I understand it means that both NDBs must be operative(i.e. no NOTAMS inop status) , another opinion that we have to have 2 onboard ADFs to work with both NDBs simultaneously. As an example, on some A320s it's possible to tune only one NDB at one moment. Thanx.
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As I recall it, what is listed on the approach page for nav aids, NDB, DME, VOR ILS etc must all be tuned and identified prior to commencing the approach.Hence a twin NDB approach can't be attempted with only one serviceable ADF on board.
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Yes you need 2 ADFs as the previous poster said, if you try to keep up with two NDBs on one ADF it may end in grief
Edit though 2NDB approaches are very rare, it would be cute seeing two little trees on the plate...I call NDBs little trees or bushes. |
Any criteria regarding unserviceability should be on the approach chart, I'd imagine. Dual NDB approaches still common in Russia (I note that's the OP's location).
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Remember having to do a twin locator in anger once into YMEN RWY 17.
Four things required. Two NDB's and two ADF's. Simples. halas |
Originally Posted by TelsBoy
(Post 10850263)
Any criteria regarding unserviceability should be on the approach chart, I'd imagine. Dual NDB approaches still common in Russia (I note that's the OP's location).
At Dubrovnik had Secretary Brown's USAF crew had dual NDB (and had they known how to use it "the Russian way") they all would still be alive today. |
Problem is in many modern outfits a single ADF is available, making these approaches impossible to fly raw data, unless approval is gained to mitigate against the lack of a second ADF.
In years gone by, we were allowed to operate dual FMC aircraft only to fly a dual NDB approach using a single ADF installation. (Approval was gained for this prior to operating) |
Originally Posted by Skyjob
(Post 10851109)
Problem is in many modern outfits a single ADF is available, making these approaches impossible to fly raw data, unless approval is gained to mitigate against the lack of a second ADF.
In years gone by, we were allowed to operate dual FMC aircraft only to fly a dual NDB approach using a single ADF installation. (Approval was gained for this prior to operating) |
I find it unbelievable that pilots are still letting down in the goo with only 90 year old technology nav aids to line them up with runway.
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Biggie old mate, Do you have any better ideas when that is all you have??
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Originally Posted by Big Pistons Forever
(Post 10851208)
I find it unbelievable that pilots are still letting down in the goo with only 90 year old technology nav aids to line them up with runway.
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Here in the US, if equipped,with dual ADFs you can use one to fly the approach and the other to listen to AM radio... you will never see a dual NDB approach here AFAIK.
I'm joking of course! |
Many thanx friends. It was useful:)
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2 NDB on approach chart and Std mnms. What does it mean? As I understand it means that both NDBs must be operative(i.e. no NOTAMS inop status) , another opinion that we have to have 2 onboard ADFs to work with both NDBs simultaneously. |
Originally Posted by mustafagander
(Post 10851480)
Biggie old mate, Do you have any better ideas when that is all you have??
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Originally Posted by Pugilistic Animus
(Post 10851643)
Here in the US, if equipped,with dual ADFs you can use one to fly the approach and the other to listen to AM radio... you will never see a dual NDB approach here AFAIK.
I'm joking of course! |
Originally Posted by Big Pistons Forever
(Post 10851208)
I find it unbelievable that pilots are still letting down in the goo with only 90 year old technology nav aids to line them up with runway.
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Originally Posted by deja vu
(Post 10856709)
Yeah, could you imagine, no magenta line, no map display, no FMS , no coupled approach, no RNAV plus skill required.
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... if my recall is not yet totally deranged ... we used to be able to do a twin locator approach in Oz with one ADF. Start on the outer and then switch to the inner between the two. I don't know that any of us actually liked the idea at all but, with eyes wide, we managed. I guess it helped not having any real tiger country to contend with.
It is possible that, with the debilitating passage of time, we only trained these on the Link .. it was all a long time ago, now. |
JT was that on the 727 or 737, and was the ADF needle on a RMI or fixed card? just curious
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As best I can recall, this was when I joined Ansett as a sprog on the F27. Some of the fleet were a tad primitive in the navaids department ... wandering off a little, do you have any knowledge of the AL30J autopilot ? If not, Dora-9's post #48 in https://www.pprune.org/pacific-gener...endship-3.html is illuminating (he was a checkie on the Type for quite a while - after my time in the RHS so I never flew with him). The later aircraft (L188, and the Boeings) were a little better equipped. I know I have flown the EN twin locator with one ADF but whether that was on the F27 or light twin late one night, I just can't remember - I can't even remember what I had for breakfast yesterday ....
I think that all the Fokkers had RMIs (?) - the Dora-9s, Donderwolkes and such fine chaps will recall with far greater clarity than I. If my recall related to a light twin, that would have been fixed card. (PS I shouldn't have mentioned that Fokker thread ... just wasted how ever long re-reading it ... many chuckles and guffaws along the way ....) |
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