Here are the main principles and rules for SSIM messages.
• All dates, days and times are in UTC
• Timings are on stand / off stand (not runway time)
• Dates and periods of operations must be within the season period
• Two seasons: Summer and Winter
• Summer starts on the last Sunday in March through to the Saturday of the last weekend in October
• Winter starts on the last Sunday in October through to the Saturday of the last weekend in March
• Messages must be answered within 3 business days
• Only 1 scheduled arrival and/or departure on the same day for a given flight designator
• Messages can be sent by SITA (LONACXH) or email (lonacxh@acl-uk.org). For email the following rules apply
• Plain text format only
• No attachments
• Email body must begin with the message format i.e. SCR
• Your email address must be specified in the reference line of the header
• Any non-standard text must be preceded by a GI footer line