Definition
Required instructions printed on a Standard Instrument Departure (SID) chart that the pilot must follow exactly as written. These notes specify non-negotiable conditions for using the procedure, such as required equipment, minimum climb gradients, communication failure procedures, or specific routing restrictions. They are distinguished from advisory or informational notes and form part of the procedure itself.
Plain English
Notes on a departure chart that you must obey, not just consider. They aren't suggestions or background information — they are rules that come with the procedure.
Context Anchor
Seen in the notes section of an instrument departure procedure during preflight planning and before accepting or flying the assigned departure.
Derivation
‘Mandatory’ comes from the Latin mandatum, meaning ‘a command’ or ‘something ordered.’ ‘Procedural’ refers to the procedure itself. Together the phrase signals that these notes are commands attached to the procedure, not optional guidance.
Why Pilots Care
Compliance ensures obstacle clearance, proper routing, and legal adherence to the published procedure; failure to follow them can result in deviations, ATC intervention, or unsafe flight paths.
Intuition Check
Do not read mandatory procedural notes as helpful hints or background information. In this context, mandatory means required, and the notes are part of the procedure you must comply with.
Example Sentence 1
Before accepting the SID, the crew reviewed the mandatory procedural notes and confirmed the aircraft could meet the required climb gradient.
Example Sentence 2
The departure clearance included a reminder to comply with all mandatory procedural notes on the chart.