25 May 2005
When used with runway visual range (RVR) below 730m.
When approach lights are installed, half of threshold lights may be circuited with approach lights.
Required for Category II and Category III IMC.
Standby power required only for taxiways serving precision instrument approaches.
Taxiway exit lights controlled separately from taxiway lights except with taxiway centerline lights.
Provide a remote selector switch for switching to simplified short approach lighting system with runway alignment indicator lights
Provide an on/off remote control for sequenced flashing lights separate from steady-burn lights.
Emergency power is not required, but use it if it is available.
Remote control is required, or indirect control is required if powered by runway edge light circuit.
Preferably ATCT on/off control. A photoelectric or clock control is acceptable.
An on/off control is required. If the runway light circuit is used for power, no separate control is required.
If powered by a runway circuit, brightness cannot vary more than 20 percent at lowest runway light brightness.
Obstruction lights for day marking to automatically select reduced intensity for night operation.
Observe visually. If lighting cannot be readily observed, provide remote monitoring.
120V/240V or constant current series circuit.
Standby power for medium intensity lights is required for primary runways
Constant Current Series Circuit
Three Step Brightness
Five Step Brightness