Minimum en route altitude
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Minimum en route altitude
Hi there,
Just wondered if anyone could point me in the direction of the JAA area for MEA? Minimum en route altitude? I need a definition for it but have been unsuccessful so far,
Antony
Just wondered if anyone could point me in the direction of the JAA area for MEA? Minimum en route altitude? I need a definition for it but have been unsuccessful so far,
Antony
Join Date: May 2000
Location: Glorious West Sussex
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JAR-OPS 1.250 requires operators to establish minimum flight altitudes and have their method approved by the Authority.
IEM OPS 1.250 (that's "Interpretative/ Explanatory Material") gives examples of suitable methods, the only one to mention MEA is this one....
4 ATLAS Formula
4.1 Minimum safe En-route Altitude (MEA). Calculation of the MEA is based on the elevation of the highest point along the route segment concerned (extending from navigational aid to navigational aid) within a distance on either side of track as specified below:
i. Segment length up to 100 nm – 10 nm (See Note 1 below).
ii. Segment length more than 100 nm – 10% of the segment length up to a maximum of 60 nm See Note 2 below).
NOTE 1: This distance may be reduced to 5 nm within TMAs where, due to the number and type of available navigational aids, a high degree of navigational accuracy is warranted.
NOTE 2: In exceptional cases, where this calculation results in an operationally impracticable value, an additional special MEA may be calculated based on a distance of not less than 10 nm either side of track. Such special MEA will be shown together with an indication of the actual width of protected airspace.
4.2 The MEA is calculated by adding an increment to the elevation specified above as appropriate:
Elevation of highest point Increment
Not above 5 000 ft 1 500 ft
Above 5 000 ft but not above 10 000 ft 2 000 ft
Above 10 000 ft 10% of elevation plus 1 000 ft
NOTE: For the last route segment ending over the initial approach fix, a reduction to 1 000 ft is permissible within TMAs where, due to the number and type of available navigation aids, a high degree of navigational accuracy is warranted. The resulting value is adjusted to the nearest 100 ft.
Hope that helps, TP
IEM OPS 1.250 (that's "Interpretative/ Explanatory Material") gives examples of suitable methods, the only one to mention MEA is this one....
4 ATLAS Formula
4.1 Minimum safe En-route Altitude (MEA). Calculation of the MEA is based on the elevation of the highest point along the route segment concerned (extending from navigational aid to navigational aid) within a distance on either side of track as specified below:
i. Segment length up to 100 nm – 10 nm (See Note 1 below).
ii. Segment length more than 100 nm – 10% of the segment length up to a maximum of 60 nm See Note 2 below).
NOTE 1: This distance may be reduced to 5 nm within TMAs where, due to the number and type of available navigational aids, a high degree of navigational accuracy is warranted.
NOTE 2: In exceptional cases, where this calculation results in an operationally impracticable value, an additional special MEA may be calculated based on a distance of not less than 10 nm either side of track. Such special MEA will be shown together with an indication of the actual width of protected airspace.
4.2 The MEA is calculated by adding an increment to the elevation specified above as appropriate:
Elevation of highest point Increment
Not above 5 000 ft 1 500 ft
Above 5 000 ft but not above 10 000 ft 2 000 ft
Above 10 000 ft 10% of elevation plus 1 000 ft
NOTE: For the last route segment ending over the initial approach fix, a reduction to 1 000 ft is permissible within TMAs where, due to the number and type of available navigation aids, a high degree of navigational accuracy is warranted. The resulting value is adjusted to the nearest 100 ft.
Hope that helps, TP
