Expanded CDM Procedures (TWR/GND/DEL)

BeforeThese youprocedures start,are makefor sureDEL, GND and TWR. Follow them in full unless traffic is very light. A CTOT must always be followed.

Start CDM is started for yourthe airport.airport first. See Starting CDM & handing over master.

Expanded CDM Procedures (TWR/GND/DEL)

This covers both ATFCM (CTOTs) and A-CDM (TSATs).

ExpandedBIRD runs CDM procedureswith arereal donemode off. The EOBT is never copied into the TOBT, so a flight has no TSAT until the pilot sets a TOBT on the VDGS or you set one. Getting the TOBT is part of every clearance.

The lists

DEL and GND work from the start-up list.list; TWR may use the departure listlist. instead. Please note that:

• You should follow A-CDM procedures unless traffic is low, using eitherClick the departureTSAT listheader orto thesort by start-up list.
• You MUST adhere to the displayed CTOT for take-off.

Reference Material

Click the TSAT column header. This sorts the list by TSAT and makes it easier to manage.time.

Expanded mode shows a lot more information, but the procedures are very similar.

Columns

There are four main times (EOBT, TOBT, TSAT, CTOT), three status columns (E, TTG, CONF) and four additional items (ASRT, ASAT, DE-ICE, ECFMP).

• EOBT: Estimated Off-Block Time
  • The off-block time filed in the flight plan (e.g. from SimBrief). The time the passengers show up for.
• TOBT: Target Off-Block Time
  • The time the aircraft expects to be ready, confirmed or updated by the pilot on the VDGS (vats.im/vdgs) or set by ATC.
• TSAT: Target Start-up Approval Time
  • The time the system calculates from the TOBT to fit the aircraft into the departure sequence.
  • Mainly for local airport capacity.
• CTOT: Calculated Take-Off Time
  • The aircraft must take off within -5/+10 minutes of this time. The TSAT is adjusted to match.
  • For external capacity (ATFCM, ECFMP).

ColourColumn	EOBTWhat it shows	TOBT	TSAT	CTOTClick to
LIGHT GREENEOBT	--Filed off-block time	Valid,Edit but not yet active	--EOBT
DARK GREENTOBT	--Target off-block time	ActiveEdit TOBT, or Ready TOBT (withinsets it to now)
TSAT	Start-up time	Calculated, no action
TTOT	Take-off time	Calculated, no action
CTOT	Slot	Set or remove a manual CTOT (master only)
TSAC	The TSAT you gave the start-pilot	Set it to the current TSAT
ASRT / READY	Pilot has called ready	Set or clear ASRT
ASAT	Start-up window)approved	Set by CDM server*
YELLOW	--	TOBT+4 to +5 (about to expire)	TSAT+4 to +5 (about to expire)	Default colour
RED	Flight suspended	--		Set by CAD*
ORANGE	EOBT more than 5 min from TOBT			Set by manual event*
WHITE	Default colour			--STUP/PUSH

*The source of a CTOT is for information only.

---

• E: Whether the TOBT is valid.
• TTG: Time to go until the TSAT (negative = time remaining, positive = past the TSAT).
• CONF: Whether the TOBT has been confirmed (or changed) by the pilot or by ATC.

Colours

Column	Colour	E	TTG	CONFMeaning
DARK GREENTOBT	CorrectLight (C)green or/ Passeddark (P)green	-35Before min/ toafter +3 min	Default colourEOBT-5
YELLOWTOBT	--Yellow	+4Last minminute tobefore +5the min	TSAT+4TOBT expires
REDEOBT	Invalid (I)Orange	--Pilot has changed the EOBT and it differs from the TOBT
TSAT	Light

greenValid,

---

not

yet
• ASRT:in Actualthe Start-up Request Time
  • The timewindow: the pilot requestedmust start-up.wait SetTSATDark it when a pilot calls before their TSAT window. It stopsgreenIn the flightwindow being invalidated at (TSAT and lets the system look for an earlier TSAT.
• ASAT: Actual Start-up Approval Time
  • When start-up is approved (status set to STUP or PUSH), ASAT is recorded and the rest of the line turns grey.
• DE-ICE: De-icing assigned
  • The aircraft needs de-icing, so the taxi-out time is extended.
• ECFMP: European Collaboration and Flow Management Project
  • Shows where a flow measure comes from. For information only.

Procedures

The procedures depend on whether you are handling sequencing only, or both clearance delivery and sequencing.

Aircraft calls for ATC clearance (if within your area of responsibility)

If a CTOT is present: advise the pilot of the CTOT and of the earliest start-up time (TSAT).

If there is no CTOT: no further action is required at this stage.

Aircraft calls for start-up/pushback

Check the times:

• TSAT dark green±5): start-up can be approved.
approved
• TSAT light green: the pilot is more than YellowTSAT+5 minutesto early+6: andapprove mustnow wait.
• TSAT yellow: start-up can be approved, but be quick, asor it isexpires aboutTSATBlankNo toTOBT, expire.
or
• TSAT blank: the flight has been invalidated andcancelled: a new TOBT is needed TSACOrangeThe TSAT has moved more than 5 minutes from what you gave the pilot CTOTGreen / Red / OrangeNetwork slot / flow or capacity slot / manual or event slot

  Delivery

  1. Check the TOBT.
     • Set on the VDGS and still valid: use it.
     • Missing or clearly wrong: ask for it and enter it with Edit TOBT.
     • Pilot ready now: use Ready TOBT.
  2. Wait up to 10 seconds for the TSAT. Check the CTOT column and, if there is a slot, the FLOW column for the regulation.
  3. Give the clearance with the slot (setif byany) and the start-up time, then click TSAC.
  4. When the pilot oncalls theready, VDGS,click or by you with Ready TOBT)ASRT.

If

When the TSAT isturns lightdark green,green, transfer to Ground.

During events with a slot file, the slot shows in the event slot column. Use Add Event CTOT as MAN CTOT to apply it. Do not use the old VATCAN Bookings SLOT column.

Ground

1. TSAT dark green: approve start-up or push. Set STUP or PUSH to record the ASAT.
2. TSAT light green: the pilot is present,early. orSet theASRT TOBTif isnot invalidalready (expired),set, try to improve it with Ready TOBT (right-click the TOBT). This sets the TOBT to the current time and recalculates to look for an earlier TSAT.
   TSAT,

   Ifthen give the TSAT is still light green after that, start-up cannottime beand approvedask yet:

   • Click ASRTthem to recordcall thatback.
   • TSAT blank: the times were cancelled. If the pilot has requested start-up.
   • Approve start-up when the TSAT turns dark green.

   When start-up is approved:

   ready
   now,
   • Set the status to STUP or PUSH. This records theuse ASATReady TOBT and greys outgive the restnew ofTSAT. Otherwise ask them to update the times.TOBT Theon the VDGS.
   • With a CTOT: time the taxi so the aircraft is released.

Flow Chart

Right-clickreaches the imageholding andpoint selectinside "Openthe inslot window.

Tower

1. Take-off must be within CTOT -5/+10. Do not clear an aircraft for take-off more than 5 minutes before its CTOT.
2. If an MDI is active, keep the interval between airborne times. You may clear an aircraft slightly early to meet it.
3. During radar release periods, get an APP release for each departure before take-off clearance.

Missed slots

Situation	Action
Will miss by up to 10 minutes, flight plan active	CTOT options → EXTEND (+10 minutes, once only)
Will miss by more	Use Ready TOBT or the Network Status REA option. vIFF issues a new tab"CTOT.
Manual or event slot	The CDM master sets a new manual CTOT
CTOT has changed	Pass the new slot to the pilot: "revised slot ..."

For phraseology, see itCDM in higher resolution.phraseology.