Lsalt Cb - Tanta
Bottums Up
Blip
I'll say it's incredible.
Go to Airservices AIP , page 15, or do a search of Lowest Safe; alternately Jeppesen ATC, AU-806, para 3.6.
Using a Grid LSALT is acceptable but using the nearest published track LSALT, might avoid actually hitting anything but may not ensure minimum required terrain clearance.
I'll say it's incredible.
Go to Airservices AIP , page 15, or do a search of Lowest Safe; alternately Jeppesen ATC, AU-806, para 3.6.
Using a Grid LSALT is acceptable but using the nearest published track LSALT, might avoid actually hitting anything but may not ensure minimum required terrain clearance.
Thread Starter
Well in the Jeps ENROUTE section, page AU-27 it says:
ROUTE FLIGHT PLANNING REQUIREMENTS
1. All ACFT are required to comply with the following planning requirements when operating in civil controlled airspace.
YSCB YMML
DCT CB UQ215 TANTA Q38 ML DCT
So if it is a requirement to plan via that route, you'd think it was reasonable to a least publish the LSALT for the first leg of that route.
But I suppose rules are rules. Some bright spark must have realised that RNAV routes are flown by big jets that fly really really high in the sky. What would they need LSALT for?!
Yes Capt Fathom you are absolutely correct.
swh Really? Can you do that?
ROUTE FLIGHT PLANNING REQUIREMENTS
1. All ACFT are required to comply with the following planning requirements when operating in civil controlled airspace.
YSCB YMML
DCT CB UQ215 TANTA Q38 ML DCT
So if it is a requirement to plan via that route, you'd think it was reasonable to a least publish the LSALT for the first leg of that route.
But I suppose rules are rules. Some bright spark must have realised that RNAV routes are flown by big jets that fly really really high in the sky. What would they need LSALT for?!
Yes Capt Fathom you are absolutely correct.
swh Really? Can you do that?
Capt Bloggs,
Section 19 of the designated airspace handbook has all of the routes published in Oz, and guess what some RNAV routes do have published LSALTs, now thats incredulous.
:;
Blip,
Yes the boxs in our aircraft do that, very handy for diversions at night.
Section 19 of the designated airspace handbook has all of the routes published in Oz, and guess what some RNAV routes do have published LSALTs, now thats incredulous.
:;
Blip,
Yes the boxs in our aircraft do that, very handy for diversions at night.
Swh,
Thank you. Perhaps you could enlighten us about what percentage of RNAV routes have LSALTs published?
Blip,
That "bright spark" probably has saved industry many many thousands of dollars by deciding that RNAV routes don't require LSALTs. And his justification probably was, as you hypothesise, that most RNAV routes are flown by higher-flying aircraft.
Another consideration here is that Grid MSAs provide a higher level of safety: instead of the highest LSALT for the whole segment, they allow you to descend (if that's what your worried about) to the lowest altitude for the grid square you are in at the time, that being far better than being "stuck" at 8700ft for the whole segment. You will, of course, know what grid square you are in becuase you are on an RNAV route and your therefore would be navigating with an appproved RNAV system...
There are hundreds of "required" RNAV routings that don't have LSALTs published
Thank you. Perhaps you could enlighten us about what percentage of RNAV routes have LSALTs published?
Blip,
That "bright spark" probably has saved industry many many thousands of dollars by deciding that RNAV routes don't require LSALTs. And his justification probably was, as you hypothesise, that most RNAV routes are flown by higher-flying aircraft.
Another consideration here is that Grid MSAs provide a higher level of safety: instead of the highest LSALT for the whole segment, they allow you to descend (if that's what your worried about) to the lowest altitude for the grid square you are in at the time, that being far better than being "stuck" at 8700ft for the whole segment. You will, of course, know what grid square you are in becuase you are on an RNAV route and your therefore would be navigating with an appproved RNAV system...
There are hundreds of "required" RNAV routings that don't have LSALTs published
Capn Bloggs,
If you pull out your AU(HI)10B you can see some of the Tasman RNAV routes like Sydney Auckland (N774 & L521) routes have published LSALTS of 1500.
As to how many L, M, N, P, Q, Y, T, Z RNAV routes have published LSALTS, dont know
Capt Fathom & Blip,
I would not use the 8300/8700 numbers, fairly simple to look elsewhere apart from the HI chart to get a finer GLSALT, AU(LO)8, or even the Canberra <10-1> chart will show you a GLSALT in green of 7700 that you can use for UQ215.
You will also need to comply with the climb requirments on the Canberra SIDs which are up to 6.6%.
If you pull out your AU(HI)10B you can see some of the Tasman RNAV routes like Sydney Auckland (N774 & L521) routes have published LSALTS of 1500.
As to how many L, M, N, P, Q, Y, T, Z RNAV routes have published LSALTS, dont know
Capt Fathom & Blip,
I would not use the 8300/8700 numbers, fairly simple to look elsewhere apart from the HI chart to get a finer GLSALT, AU(LO)8, or even the Canberra <10-1> chart will show you a GLSALT in green of 7700 that you can use for UQ215.
You will also need to comply with the climb requirments on the Canberra SIDs which are up to 6.6%.
