(Minimum Reception Altitude) The lowest published altitude MRA – between radio fixes which assures acceptable navigational signal coverage. It does not assure terrain coverage. Refer to for a depiction of an MRA on NACO charts. Figure B (Minimum Sector Altitude) The lowest published altitude within MSA – 25 nm of a fix that meets obstacle clearance requirements. (Maximum Authorized Altitude) The highest published altitude MAA – usable for a route segment that ensures signal reception without interference from another signal on the same frequency. There are many symbols that are unique to IFR enroute charts. (refer to the point on an airway where you Changeover Point Figure C) – should switch to another navaid for navigation purposes. (refer to Change in MEA/MOCA Figure D). (refer to Compulsory Reporting Points Figure E). (refer to Non-Compulsory Reporting Points Figure F). Regulations state that in certain situations, a pilot must make position reports. The following should be made at all times without a specific request: When vacating any previously assigned altitude or flight level for a newly assigned altitude or flight level. When an altitude change will be made if operating on a clearance specifying VFR-on-top. When unable to climb/descend at a rate of at least 500 fpm. When going missed off an approach. Change in TAS when it varies by 5% or 10 kts, whichever is greater, from that filed in the flight plan. The time and altitude or flight level upon reaching a holding fix or point that the pilot is cleared to. When leaving any assigned holding fix or point. Any loss, in controlled airspace, of VOR, ADF, complete or partial loss of ILS receiver capability or impairment of air/ground communications capability. Any information relating to the safety of flight. Upon encountering any weather or hazardous conditions not forecasted. The following should be made at all times when not in radar contact: When leaving the FAF inbound (non-precision approach) or when leaving the outer marker (or fix used in lieu of the outer marker) inbound (precision approach).
MRA (Minimum Reception Altitude) – The lowest published altitude between radio fixes which assures acceptable navigational signal coverage. It does not assure terrain coverage. Refer to Figure B for a depiction of an MRA on NACO charts. MSA (Minimum Sector Altitude) – The lowest published altitude within 25 nm of a fix that meets obstacle clearance requirements. MAA (Maximum Authorized Altitude) – The highest published altitude usable for a route segment that ensures signal reception without interference from another signal on the same frequency. There are many symbols that are unique to IFR enroute charts. Changeover Point (refer to Figure C) – the point on an airway where you should switch to another navaid for navigation purposes. Change in MEA/MOCA (refer to Figure D). Compulsory Reporting Points (refer to Figure E). Non-Compulsory Reporting Points (refer to Figure F). Regulations state that in certain situations, a pilot must make position reports. The following should be made at all times without a specific request: When vacating any previously assigned altitude or flight level for a newly assigned altitude or flight level. When an altitude change will be made if operating on a clearance specifying VFR-on-top. When unable to climb/descend at a rate of at least 500 fpm. When going missed off an approach. Change in TAS when it varies by 5% or 10 kts, whichever is greater, from that filed in the flight plan. The time and altitude or flight level upon reaching a holding fix or point that the pilot is cleared to. When leaving any assigned holding fix or point. Any loss, in controlled airspace, of VOR, ADF, complete or partial loss of ILS receiver capability or impairment of air/ground communications capability. Any information relating to the safety of flight. Upon encountering any weather or hazardous conditions not forecasted. The following should be made at all times when not in radar contact: When leaving the FAF inbound (non-precision approach) or when leaving the outer marker (or fix used in lieu of the outer marker) inbound (precision approach).
Enroute-and-Lost-Comms.docx