What is the Radar Minimum Altitude for an aircraft on a magnetic bearing of 100° from the Aberdeen aerodrome (EGPD) and at a distance of 13 NM from the aerodrome?
Refer to figure.
The chart depicts the Radar Minimum Altitudes or Minimum Radar Vectoring Altitudes (MRVA) or Minimum Vectoring Altitude (MVA) or ATC Surveillance Minimum Altitude (ASMA). It is the lowest altitude, expressed in feet AMSL, to which a radar controller may issue aircraft altitude clearances during radar vectoring and meets obstacle clearance requirements in the airspace specified.
MRVA allows ATC Radar to vector and descend an aircraft below the Minimum Safe (Sector) Altitude (MSA) to achieve VFR or to join a procedure. Thus, MRVA can have a lower value than MSA. Minimum vectoring altitudes provide obstacle clearance at all times, until the aircraft reaches the point where the pilot will resume own navigation. Especially, an MRVA provides obstacle clearance 1000 ft above the highest obstruction in non-mountainous areas and 2000 ft above the highest obstacle in designated mountainous areas.
On this chart, you can see different sectors (areas of application of a minimum vectoring altitude) and their corresponding minimum radar altitudes. Each sector boundary is at least 3 miles from the obstruction used to determine the MRVA in that sector.
For this question, draw with your pencil a Magnetic bearing of 100o (or Radial 090) emanating from the Aberdeen aerodrome symbol.
An aircraft being on a magnetic bearing of 100o and at a distance 13 NM off the aerodrome will have a radar minimum altitude of 2 500 ft.
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