View Full Version : MSA Malaga
applecrumble
15th May 2017, 18:29
Why is the 25 MSA from the MLG FL90 to the northeast and FL85 to the west.
This should be an altitude rather than a flight level just in case of a very low QNH?
Can you provide a pic? The Jep set I'm looking at (admittedly not current, I don't have those to hand) show MSAs as altitudes, as expected.
Piltdown Man
15th May 2017, 20:34
ENAIRE's charts (http://www.enaire.es/csee/Satellite/navegacion-aerea/en/Page/1078418725163/?other=1083158950596&other2=1083857759015&other3=1193296551801#ancla3356) all appear to have altitudes (uncorrected for low temperature). My company uses LIDO charts and also have these two sectors as shown as Minimum Flight Levels rather than Altitudes. I shall have to look further.
Cough
16th May 2017, 09:06
Picked randomly the ILS Y 31 chart from your ENAIRE link... Interestingly has a couple of FL's on it...
Indeed so. Ditto ILS Z 12.
aterpster
16th May 2017, 14:12
This would be a question for the procedures designers.
applecrumble
17th May 2017, 05:17
Yes, I mean if the QNH was 30Hpa low then you would be getting uncomfortably close to some granite if you were at "MSA FL90"
I can't see any reason to have a FL.
^^ How do you contact the procedure designers?
aterpster
17th May 2017, 13:23
There should be an aeronautical division page on Spain's government website.
Maxfli
18th May 2017, 00:08
Suggested answer.....
In the grid to the West the highest spot height is 6190'
In the grid to the East the highest spot height is 6778'
Respective Grid MORAs 82 & 88 (rounded up to nearest 100' +2000' as above 6000)
Both are above the Transition Altitude 6000' and converted to FLs, ensuring terrain clearance in the event of low QNH.
wiggy
18th May 2017, 08:57
Agree it's a bit strange, looking at the radar vectoring chart it's all altitudes......
aterpster
18th May 2017, 14:17
The radar chart makes the same statement as the approach chart: Trans level by ATC...Trans alt: 6,000.
applecrumble
18th May 2017, 18:34
Suggested answer.....
In the grid to the West the highest spot height is 6190'
In the grid to the East the highest spot height is 6778'
Respective Grid MORAs 82 & 88 (rounded up to nearest 100' +2000' as above 6000)
Both are above the Transition Altitude 6000' and converted to FLs, ensuring terrain clearance in the event of low QNH.
Not too sure how that ensures terrain clearance in the case of low QNH.
If during a bad spell of weather (which I have seen down there) when the QNH drops significantly, then you are getting closer and closer to terrain. Just seems very odd to reference MSA on a standard pressure and no QNH.
KISS anyone. Maybe it's just to confuse us!?
I emailed the AIP nav of Spain but I'm not hopeful of a response.