SCR Crash Course

Introduction
Airport Coordination Netherlands does provide on this site some basic information and examples for customers which are new in the airport coordination business, not familiar how to deal with fully coordinated airports, or have to send an SCR only once in a while. For full and detailed information we kindly ask you to carefully study chapter 6 of the IATA SSIM (Standard Schedules Information Manual). Chapter 6 describes the procedures for using a variety of airport clearance messages (SCR, SIR, SAQ, WIR etc.). These are defined standard telegraph message formats used to obtain clearance for, or provide information of, arrival and departure times at coordinated airports. The chapter includes the principles for information exchange, technical specification, and examples. Please visit IATA's website to learn more about this manual, and how to order it.

The following information does focus on the airline's view and on the basic SCR (Slot Clearance Request/ Reply) message since this is the main communication for slot allocation between airlines and coordinators.

Main principles and rules (extract from SSIM chapter 6.2)

  • Airport slots shall be requested at least 3 working days in advance.
  • All dates, days and times are in UTC.
  • Coordinators will respond to slot allocation requests within a period of 3 business days. Clearance offers from coordinators to the airlines are valid for 3 business days only.
  • (...) Where apron occupancy (EIN), terminal (RTM), runway capacity or night movements (AMS) are coordinated, the aircraft type code must be specified and transit/turnaround format shall be used
  • For a given flight designator and date at a specific station, there can only be one scheduled arrival and/or one scheduled departure time cleared.
  • When a coordinator requires fillings as turnarounds or when airlines elect to file flights as turnarounds (i.e. arrival and departure in a single data record), any modifications pertaining to either the arrival or departure require all unchanged elements to be repeated in order to maintain the turnaround link. (...) If flights are originally filed using an over-midnight indicator, any subsequent change should again be filed using the turnaround format.
  • For E-mail communication the SSIM chapter 6 formatted message should be plain text placed directly in the E-mail body. No attachments, signatures with logos or special characters should be used.

Message standards
The SCR message consists of 3 parts:
message header, schedule information data line(s) and the message footer.

  1. message header:
    SCR message type: SCR = Slot Clearance Request
    / creator reference (optional)
    S08 IATA schedules season concerned
    22APR date of message
    AMS clearance airport concerned

     
  2. schedule information data line(s):
    N XY123 XY124 01JUL 30SEP 1234500 120319 CDG 0700 0750 CDG JJ
    1 2 3 4 5 6 7 8 9 10 11 12

     
    1 action code (more information )
    2 arrival flight designator, number (suffix possible)
    flight number must consist of min. 3 digits
    3 departure flight designator, number (suffix possible)
    flight number must consist of min. 3 digits
    4 start of period or single day
    5 end of period or single day
    6 day(s) of operation
    7 number of seats fitted (3 digits) and IATA aircraft subtype (3 alphanumeric)
    8 origin/previous station (arriving from) (IATA 3 letter codes)
    9 required arrival time in UTC
    10 required departure time in UTC
    11 next/destination station (departure to) (IATA 3 letter codes)
    12 arrival and departure service types (may be different)

    Important: between the following blocks a space character is mandatory: [2-3-4], [5-6-7-8], [9-10], [11-12] (see also examples)
    Note: Please do not send more than 30 data lines in one SCR message!
     
  3. Message footer:
    SI IF NOT AVBL PLS GIVE NEAREST POSSIBLE
    GI BRGDS.....


    SI = supplementary information (in connection with content of SCR message)
    GI = general information (e.g. greeting)

    Note: It is compulsory that any additional text following the data lines starts either with "SI" or with "GI"!

About replies sent by the coordinator
We usually reply to your request as soon as possible (please mind our business hours) but latest within 3 business days. Should we require any special clarification we will inform you accordingly. Should your required time not be available we will provide you with the closest available slot. We appreciate if you reply to our offer within 3 working days. On our offer reply you will find an additional data line indicating the so-called reason code (CA, CD), which will inform you about the main constraint which caused the non-availability of your request. The decoding of these reason codes can be found in the SSIM manual.

Here are a few basic examples (with fake flight numbers) how to compose an SCR message correctly:

  • New request in transit/turnaround format, for weekdays 1-5 from July 1 until September 30 (above example):

    SCR
    S08
    22APR
    AMS
    NXY123 XY124 01JUL30SEP 1234500 120319 CDG0700 0750CDG JJ
    SI IF NOT AVBL PLS GIVE NEAREST POSSIBLE
    GI BRGDS
  • New request for an ad-hoc flight:

    SCR
    S08
    22APR
    EIN
    NDY998 DY997 18OCT18OCT 1000000 14573G MAN1125 1215MAN CC
    GI BRGDS
  • New requests for multiple flights (at same airport):

    SCR
    S08
    22APR
    RTM
    NBA998 BA997 18OCT18OCT 1000000 14573G MAN1125 1215MAN CC
    NBA996 BA9

Tools


 

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