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Refer to figure or chart "E LO 1" from Jeppesen GSPRM 2017. 
A section of a flight is carried out from SUMBURGH (SUM) to ABERDEEN (ADN) along airway Y905. What is the lowest continuous FL you can use?

  • A
    FL110
  • B
    FL80
  • C
    FL50
  • D
    FL190

Refer to figure.
FL110, FL50 and FL80 are MEAs (Minimum Enroute Altitudes) 
FL 110 is the lowest useable flight level for all of the route - If we fly at FL110, we will not fly below any of the other restrictions (FL80 and FL50).

  • FL 190 is a MAA (Maximum Authorised Altitude).
  • FL 80 is the MEA between GAVEL and ERDOG.
  • FL 50 is the MEA between PETOX and ADN.

Note: The track from SUMBURGH to ABERDEEN is 189° M => Therefore, the IFR Semi Circular level should be FL120. If FL120 was an option it would be the correct one. FL110, in this case, is the most correct.

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