Jump to content
Sign in to follow this  
Harry Sugden

active 2017-05-25 - CAP 493 - Determining Transition Level

Recommended Posts

Harry Sugden

Effective 25/05/2017

The method for determining Transition Level is being changed. Prior to this SI, Transition Level was the first flight level above Transition Altitude (TA). This did not provide any vertical separation because Transition Level was at most 500 ft above TA.

Transition Level is changing so that is will always provide a minimum of 1,000 ft above TA. This means aircraft flying at Transition Level will be vertically separated from aircraft flying at TA.

CAP 493 (MATS Part 1 S1 Ch7 5B): Transition level is the lowest Flight Level available for use above the transition altitude and shall be located at least a nominal 1,000 ft above the transition altitude to permit the transition altitude and the transition level to be used concurrently in cruising flight, with vertical separation ensured. Except where an alternative means of calculating the transition level is detailed within local instructions, the transition level may be determined from the table as follows:

fd33b1206a.png&key=5979b6da8389bbc53d7f8

  • There are no changes to local rules about whether QNH 1013 means high or low pressure -  these remain the same.
  • Minimum Stack Level (MSL), where applicable, is exactly the same for a given QNH.
  • MSL is now defined as: "the first whole flight level which is equal to, or higher than, the Transition Level”.
Edited by Nathan Donnelly

Share this post


Link to post
Share on other sites
Chris Pawley

Just a reminder, this will be effective at the new AIRAC (1706) dated 25 May 2017

 

Chris

Share this post


Link to post
Share on other sites
Sign in to follow this  

  • Similar Content

    • Chris Pawley
      By Chris Pawley
      Effective 28 March 2019
       
      A number of frequency changes are effected at Prestwick:
      Prestwick Approach 124.620 becomes 124.630- due to 8.33 kHz spacing restrictions we are unable to replicate this, so the original frequency is retained
      Prestwick ATIS 121.120 becomes 121.130 - due to 8.33 kHz spacing restrictions we are unable to replicate this, so the original frequency is retained
       
      Documentation will be updated in future to inform future users of discrepancies on these frequencies 
    • Chris Pawley
      By Chris Pawley
      Effective 28 March 2019
      A number of frequency changes are effected at East Midlands:
      East Midlands Ground 121.900 becomes 121.905 - due to 8.33 kHz spacing restrictions we are unable to replicate this, so the original frequency is retained
      East Midlands Tower 124.000 becomes 124.005 - due to 8.33 kHz spacing restrictions we are unable to replicate this, so the original frequency is retained
      East Midlands Director 120.120 becomes 120.130 - due to 8.33 kHz spacing restrictions we are unable to replicate this, so the original frequency is retained
      East Midlands ATIS 122.670 becomes 122.680 - due to 8.33 kHz spacing restrictions we are unable to replicate this, so the original frequency is retained
       
      Documentation will be updated in future to inform future users of discrepancies on these frequencies
    • Chris Pawley
      By Chris Pawley
      Effective 28 March 2019
       
      In order to rationalise danger area designation, a number of danger areas are redesignated to a standard form:-
      EG D 006->EG D 006b EG D 007->EG D 007c EG D 008->EG D 008c EG D 009->EG D 009b EG D 133->EG D 133b EG D 138->EG D 138d The standard form is that any danger area with subsections, should each contain a letter designator - those without designated numerically only. Any references to danger zones in written documentation will be updated in a future update. The Sector File contains these changes from the effective date.
    • Chris Pawley
      By Chris Pawley
      Effective 28 March 2019
       
      A frequency monitoring code is established (3727) for Brize Norton. Those aircraft outside controlled airspace, but tuned to Brize Norton Approach (124.270) may use this code in order to indicate their presence on the frequency.
       
      Local documentation will be updated to reflect this in a future update.
    • Chris Pawley
      By Chris Pawley
      Effective 31 January 2019
       
      The following frequencies are updated at Belfast/City
       
      Belfast/City Tower 122.820 becomes 122.830 - however due to the inability to simulate 8.33 kHz frequencies - we will retain the existing frequency
      Belfast/City Information 136.620 becomes 124.580 - however due to inability to simulate 8.33kHz frequencies - we will use 124.570
       
      The UK Sector File is updated per 2019/02. Other resources will be updated in a future AIRAC cycle.
×
×
  • Create New...