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An airway is marked 5000 2900a. The notation 5000 is the…

  • A
    minimum enroute altitude (MEA).
  • B
    minimum holding altitude (MHA).
  • C
    base of the airway (AGL).
  • D
    maximum authorised altitude (MAA).

Refer to figure.
Minimum Enroute Altitude (MEA) = Number without any prefix or suffix, in this case 5000 ft ("5000")

Minimum Off-Route Altitude (MORA) = Suffix "a", in this case 2100 ft ("2100a")
Minimum Obstruction Clearance Altitude (MOCA) = Will be identified by the suffix "T"
Maximum Authorised Altitude (MAA) = Will be identified by the prefix "MAA"

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