NOTAM Interpretation

What is NOTAM Interpretation?

NOTAM interpretation means decoding the structured format and abbreviations used in NOTAM messages. Each NOTAM follows a standard format, including a qualifier line (Q-line) and specific fields (A to E) that detail the affected location, timing, and operational impact.

Key Elements of a NOTAM

• Q-line: Contains the FIR, subject code, traffic affected (IFR/VFR), purpose, scope, lower/upper limits, and the geographical centre with radius of influence.
• Fields A-E:
  • A) Location (ICAO code of aerodrome or FIR)
  • B) Start time (UTC, in YYMMDDHHMM)
  • C) End time (UTC, may be 'EST' for estimated)
  • D) Schedule (if applicable)
  • E) Plain language description of the hazard or change, often using ICAO abbreviations

Practical Use in Flight Planning

When planning a flight, you must check NOTAMs for all relevant aerodromes and airspace along your route. Look for information about runway closures, lighting outages, changes to navigation aids, restricted areas, and any work in progress (WIP). Always verify the effective times and the radius of influence to determine if your flight will be affected.

Common NOTAM Interpretation Tasks

• Decoding abbreviations and codes to understand operational impact
• Identifying which FIR and aerodrome are affected
• Determining the validity period and whether 'EST' means the end time is subject to change
• Assessing if the NOTAM applies to your planned route, altitude, or time of operation