Final answer:
NOTAMs are advisories for pilots regarding potential hazards. They come in formats for temporary situations ('Till approx.'), for cancelling previous NOTAMs, and for replacing them with updated information.
Step-by-step explanation:
NOTAMs, which stands for Notices to Airmen, are critical advisories issued to alert aircraft pilots of potential hazards along a flight route or at a location that could affect the safety of the flight. When discussing NOTAM formats, we can refer to three specific types:
- Till approx.: This type of NOTAM is issued for a temporary period and includes an approximate end time for the situation described.
- Cancelling: A NOTAM may be issued to cancel a previous NOTAM when the hazard no longer exists or the situation has been resolved.
- Replacing: This format is used when one NOTAM replaces another to update or correct information regarding the hazard or situation.
Understanding the correct format and interpretation of NOTAMs is essential for pilot situational awareness and contributes to the safety and efficiency within airspace management.