ADT vs CTOT
 

Would some nice person be able to explain the difference between:
Approved Departure Time
Calculated Take Off Time

Many thanks

Buggered if I know!!!!

You need either SilentHandover or Mr Chips to reply. They know everything!

As I understand the system (and I'm certainly no expert),

The Appoved Departure Time, is as it says, the time your departure is approved for i.e the time filed in your plan.

The Calculated Take Off Time is basically a departure slot allocated by flow control, the system works on an estimated off blocks time and a nominal taxy time for the aerodrome (EGPF 10mins) and the delay is determined from that.

The CTOT has some tolerance at some units, usually -5mins to +10mins around the CTOT.#
Flow are a lot stricter now and no leeway outside these times is permitted except under extreme circumstances which are listed in the unit MATS part2.

Hope this helps, no doubt somebody from flow will correct something I've said

As an aside, any of you fly guys out there, when you have a slot, if its busy, call ground a little bit earlier for push/start that way we won't have to refuse/send you back to stand because you've got stuck in a queue, we may tell you to wait, but a least we'll get you going in time for the slot
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Turn left heading 230, close from the left, report established

[This message has been edited by form49 (edited 16 November 2000).]

Approved Departure Times are what they use to be called, now (since CFMU) they're Calculated Take-Off Times. We still call 'em 'slots'!!! :)

Oi - I know NOTHING about flow, and i'll sue any bugger who says that i do!!! ;)

[This message has been edited by Mr Chips (edited 16 November 2000).]

Your soooooo vain Mr Chips!!!!!

The AIP clouds the issue - surprise! - by referring to both CTOT and Slot times.

I'm with Lew Ton here. The ADT was what the slot was known as prior to CFMU 3 ops. The CTOT is just the new name for it and I agree, they are all just slots !

If you're having difficulty sleeping try http://www.ais.org.uk/uk_aip/pdf/enr/20109.pdf for the UK AIP gospel (produced by London FMP I think) and / or http://www.cfmu.eurocontrol.be/doc/c...MANUAL_6_0.pdf for the entire ATFM users manual for the word from the horse's mouth !

RT

Thanx!!!!!

Don't fly into EGHI by any chance do you ????

Only when there's be no rain for 7 days and 7 nights!!!!!
I'm afraid I'm EGCC based
Thanx to everybody for the info.