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ILS/VOR FM Immunity |
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Since 1 January 2001 VHF broadcasting stations in Europe are allowed to operate with reduced restrictions and increased transmitter power levels. This has a significant implication for aircraft with VHF navigational receivers, especially VOR and ILS.
Consequently, for safety reasons VOR and ILS receivers in aircraft are now required to be protected against potential interference from VHF broadcast transmissions.
This entails the use of FM immune VHF equipment by modification of existing equipment or re-equipage.
Some States have mandated the carriage of FM Immune VHF avionics for en-route and at airports. However, exemptions for State aircraft may still be negotiated on a bilateral basis.
Aircraft operators and aircrew are to refer to national aeronautical publications (AIP, AIC) for current official policy and procedures.
Additional details can be found in JAA guidance leaflet TGL 16.
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Last validation: 02/12/2004
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