A aviation & planes forum. AviationBanter

If this is your first visit, be sure to check out the FAQ by clicking the link above. You may have to register before you can post: click the register link above to proceed. To start viewing messages, select the forum that you want to visit from the selection below.

Go Back   Home » AviationBanter forum » rec.aviation newsgroups » Instrument Flight Rules
Site Map Home Register Authors List Search Today's Posts Mark Forums Read Web Partners

Obstacle Clearance Altitude / Height



 
 
Thread Tools Display Modes
  #1  
Old November 12th 04, 10:20 AM
Tim
external usenet poster
 
Posts: n/a
Default Obstacle Clearance Altitude / Height

Hi,

Could anyone give me a good explanation for OCA/OCH. I know it has
something to do with the minimums of ILS-approaches and it should
always be lower than or equal to the DA/DH. I assume it provides you
with a certain obstacle clearance at DA/DH. But how is it
determined????

Best regards,

Tim
  #2  
Old November 12th 04, 10:55 PM
Julian Scarfe
external usenet poster
 
Posts: n/a
Default

"Tim" wrote in message
om...
Hi,

Could anyone give me a good explanation for OCA/OCH. I know it has
something to do with the minimums of ILS-approaches and it should
always be lower than or equal to the DA/DH. I assume it provides you
with a certain obstacle clearance at DA/DH. But how is it
determined????


[ICAO version, YMMV, particularly if you use different sized miles.]
Obstacle clearance altitude OCH is the height on an IAP with the minimum
permitted clearance above obstacles on the final approach. It does not take
account the limitations associated with the navaid (system minimum). Thus
the DH or MDH is the higher of the OCH or the system minimum. The OCA is
obviously the altitude corresponding to the OCH.

For non-precision approaches the OCH is the height of the highest obstacle
on the final approach segment plus a speed-dependent margin. Precision
approach OCHs are more complex, I think. Most Cat I ILSs are limited by the
system minimum of 200 ft rather than the OCH.

Julian Scarfe


  #3  
Old November 21st 04, 11:33 AM
Tim
external usenet poster
 
Posts: n/a
Default

Thanks a lot.

Happy landings,

Tim
 




Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
AOPA Stall/Spin Study -- Stowell's Review (8,000 words) Rich Stowell Aerobatics 28 January 2nd 09 03:26 PM
Report Leaving Assigned Altitude? John Clonts Instrument Flight Rules 81 March 20th 04 03:34 PM
Q about lost comms on weird clearance Paul Tomblin Instrument Flight Rules 34 February 2nd 04 10:11 PM
GPS Altitude with WAAS Phil Verghese Instrument Flight Rules 42 October 5th 03 12:39 AM
Picking up a Clearance Airborne Brad Z Instrument Flight Rules 30 August 29th 03 01:31 AM


All times are GMT +1. The time now is 06:40 PM.


Powered by vBulletin® Version 3.6.4
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
Copyright ©2004-2024 AviationBanter.
The comments are property of their posters.