how to find elevation for an uncertified ALA?
Thread Starter
Join Date: Nov 2014
Location: Australia
Posts: 31
Likes: 0
Received 0 Likes
on
0 Posts
how to find elevation for an uncertified ALA?
how to find elevation for an unknown ala?
is there a way before im even up in the air?
as i can find the density by using the declared density chart in the CAO
however how would i use this data for TDR/LDR in the poh
is there a way before im even up in the air?
as i can find the density by using the declared density chart in the CAO
however how would i use this data for TDR/LDR in the poh
Join Date: Jan 2015
Location: Perth
Posts: 104
Likes: 0
Received 0 Likes
on
0 Posts
For an approximation, Google Earth.
Draw a "Path" (Add -> Path) from somewhere at sea level to your intended destination and hit Edit -> Show Elevation Profile.
Tools -> Options to change it to feet if you desire that.
In the air, part of the fun I remember during PPL navigation exercises was a diversion to an unplanned airfield. You should get a feeling for circuit heights and standard circuits so that even navigating to a unplanned airfield you can judge the circuit height and therefore approximate the airfield height even without any other information and then get ready for your ALA inspection.
Draw a "Path" (Add -> Path) from somewhere at sea level to your intended destination and hit Edit -> Show Elevation Profile.
Tools -> Options to change it to feet if you desire that.
In the air, part of the fun I remember during PPL navigation exercises was a diversion to an unplanned airfield. You should get a feeling for circuit heights and standard circuits so that even navigating to a unplanned airfield you can judge the circuit height and therefore approximate the airfield height even without any other information and then get ready for your ALA inspection.
Join Date: Jul 2007
Location: in the classroom of life
Age: 55
Posts: 6,864
Likes: 0
Received 1 Like
on
1 Post
Groggy 
Before you are up in the air suggests to me at least you are on the ground and in range of a phone/internet/jam tim and string. In such a case you should be seeking permission to use the ALA from the owner, and surely they can give you some "near enough is good enough" data on the field.
Otherwise I did not understand the question.
is there a way before im even up in the air?
Otherwise I did not understand the question.
Jabba is correct.
Don't land anywhere unless you have prior permission (preferably written) and this permission should include your required details.
I once was almost fined 10 ($5,500) demerit points by our friends at CASA for almost landing at an ALA without permission (I didn't touch down). I did have permission but it was not from the appropriately authorized person. From now on, it's written permission or an SMS as a minimum.
Don't land anywhere unless you have prior permission (preferably written) and this permission should include your required details.
I once was almost fined 10 ($5,500) demerit points by our friends at CASA for almost landing at an ALA without permission (I didn't touch down). I did have permission but it was not from the appropriately authorized person. From now on, it's written permission or an SMS as a minimum.
the known unknown...
Overfly this unknown ala...presumably your altimeter is on area QNH....at an estimated height above the field 1000'. If yr cruising at 3500' then... you have yr answer.
Once you have landed..with prior permission...check the altimeter reading and see how good yr guestimate of height above ground was.
Of course ala ht. will be a close approximate as area QNH may differ slightly from the actual ala QNH
Before flight ?....Captn Fathom has a good idea.
Once you have landed..with prior permission...check the altimeter reading and see how good yr guestimate of height above ground was.
Of course ala ht. will be a close approximate as area QNH may differ slightly from the actual ala QNH
Before flight ?....Captn Fathom has a good idea.
Free 1:250 topos
Geoscience Australia have online free 1:250k topo charts. www.ga.gov.au
Contour lines too!
If you have HEMA maps app on your iPad you can download it on there too.
Contour lines too!
If you have HEMA maps app on your iPad you can download it on there too.
Join Date: Apr 2008
Location: Australia
Posts: 669
Likes: 0
Received 0 Likes
on
0 Posts
as i can find the density by using the declared density chart in the CAO
however how would i use this data for TDR/LDR in the poh
however how would i use this data for TDR/LDR in the poh
So, take the density altitude (DALT) you derived from the CAO charts, and use the ISA model to convert it to a set of PALT and temperature numbers. Don't forget to add the elevation to the DALT value obtained from the chart.
A DALT of 2,000' for example, would be a PALT of 2,000' and temperature of 11 degrees C.
From now on, it's written permission or an SMS as a minimum.
You probably dont land at very many places then.
You probably dont land at very many places then.
What you thought was a welcoming wave.... wasn't.
93 Protection of certain rights
Nothing in these Regulations shall be construed as conferring on any aircraft, as against the owner of any land or any person interested therein, the right to alight on that land ... .
Nothing in these Regulations shall be construed as conferring on any aircraft, as against the owner of any land or any person interested therein, the right to alight on that land ... .
Join Date: Dec 2010
Location: Goolwa
Age: 59
Posts: 124
Likes: 0
Received 0 Likes
on
0 Posts
Back to how to find the elevation for an unknown ALA....
Method 1) Take a bag of flour and whilst flying over the ALA chuck it out the window (this works best in high wing aircraft) carefully measuring the time it takes to hit the ground (some sharp manoeuvring may be needed to get good visibility of the drop zone). Using the formula d = 1/2gt2 you can subtract the distance covered by the bag of flour from the altitude indicated on the altimeter and you should have the AMSL of the airfield.
Method 1) Take a bag of flour and whilst flying over the ALA chuck it out the window (this works best in high wing aircraft) carefully measuring the time it takes to hit the ground (some sharp manoeuvring may be needed to get good visibility of the drop zone). Using the formula d = 1/2gt2 you can subtract the distance covered by the bag of flour from the altitude indicated on the altimeter and you should have the AMSL of the airfield.
Join Date: Apr 2002
Location: Melbourne
Posts: 102
Likes: 0
Received 0 Likes
on
0 Posts
Jabba is correct.
Don't land anywhere unless you have prior permission (preferably written) and this permission should include your required details.
I once was almost fined 10 ($5,500) demerit points by our friends at CASA for almost landing at an ALA without permission (I didn't touch down). I did have permission but it was not from the appropriately authorized person. From now on, it's written permission or an SMS as a minimum.
Don't land anywhere unless you have prior permission (preferably written) and this permission should include your required details.
I once was almost fined 10 ($5,500) demerit points by our friends at CASA for almost landing at an ALA without permission (I didn't touch down). I did have permission but it was not from the appropriately authorized person. From now on, it's written permission or an SMS as a minimum.
You may not have a right to land somewhere without permission, however that is very different to it being a criminal offence under CARs/CAOs to land somewhere without permission.
There is something enormously satisfying (for me) in scoping out a piece of real estate in the wilderness then landing on it. I never ask permission, who would I ask? This is a hugely popular sector of aviation in the USA, with several web sites devoted to it and an FAA publication specifically written about it. In Australia it seems frowned upon and there is very little interest in the subject.
Sometimes I use Google Earth, sometimes I just scope it out from the air. My only requirements is that there is something interesting to do when I land, either camping, fishing or just sightseeing. Axiomatic to these operations is of course a STOL aeroplane and suitable tyres.
It is my belief, although I admit to no research, that this is perfectly legal as far as CASA goes, there only remains the subject of land holder permission. Given that the land I use is mostly public land anyway, way outside the public eye, why would I even ask? Given our good ole Aussie semantics, the answer would never be yes in any event.
Sometimes I use Google Earth, sometimes I just scope it out from the air. My only requirements is that there is something interesting to do when I land, either camping, fishing or just sightseeing. Axiomatic to these operations is of course a STOL aeroplane and suitable tyres.
It is my belief, although I admit to no research, that this is perfectly legal as far as CASA goes, there only remains the subject of land holder permission. Given that the land I use is mostly public land anyway, way outside the public eye, why would I even ask? Given our good ole Aussie semantics, the answer would never be yes in any event.
