Skip to main content

Expanded CDM Procedures (TWR/GND/DEL)

These procedures are for DEL, GND and TWR. Follow them in full unless traffic is very light. A CTOT must always be followed.

Start CDM for the airport first. See Starting CDM & handing over master.

BIRD runs CDM with real mode 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; TWR may use the departure list. Click the TSAT header to sort by start-up time.

ColumnWhat it showsClick to
EOBTFiled off-block timeEdit EOBT
TOBTTarget off-block timeEdit TOBT, or Ready TOBT (sets it to now)
TSATStart-up timeCalculated, no action
TTOTTake-off timeCalculated, no action
CTOTSlotSet or remove a manual CTOT (master only)
TSACThe TSAT you gave the pilotSet it to the current TSAT
ASRT / READYPilot has called readySet or clear ASRT
ASATStart-up approvedSet by STUP/PUSH

Colours

ColumnColourMeaning
TOBTLight green / dark greenBefore / after EOBT-5
TOBTYellowLast minute before the TOBT expires
EOBTOrangePilot has changed the EOBT and it differs from the TOBT
TSATLight greenValid, not yet in the window: the pilot must wait
TSATDark greenIn the window (TSAT ±5): start-up can be approved
TSATYellowTSAT+5 to +6: approve now or it expires
TSATBlankNo TOBT, or cancelled: 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 (if any) and the start-up time, then click TSAC.
  4. When the pilot calls ready, click ASRT.
  5. When the TSAT turns dark 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 early. Set ASRT if not already set, try Ready TOBT for an earlier TSAT, then give the start-up time and ask them to call back.
  3. TSAT blank: the times were cancelled. If the pilot is ready now, use Ready TOBT and give the new TSAT. Otherwise ask them to update the TOBT on the VDGS.
  4. With a CTOT: time the taxi so the aircraft reaches the holding point inside the slot 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

SituationAction
Will miss by up to 10 minutes, flight plan activeCTOT options → EXTEND (+10 minutes, once only)
Will miss by moreUse Ready TOBT or the Network Status REA option. vIFF issues a new CTOT.
Manual or event slotThe CDM master sets a new manual CTOT
CTOT has changedPass the new slot to the pilot: "revised slot ..."

For phraseology, see CDM phraseology.

Back to top