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Aerodrome Requirements
ILS Facility
• ILS Critical Area - aircraft/vehicles are excluded
during all ILS operations because they will cause
disturbances to ILS signal
• ILS Sensitive Area - area extending beyond the
critical area where movement and/or parking of
aircraft and vehicles is controlled to prevent the
possibility
• ILS beam to be protected by longitudinal
separation
Aerodrome Requirements
RVR Measurements
• Number depend on type of operation
• Generally 110 to 150m from centreline
• Nominally 5m-10m in height
• ICAO recommends readout of 50m increments
when RVR less than 800m and 25m increments
when RVR less than 150m
• Normally ATC give Mid unless the others lower
Aerodrome Requirements
Maintenance
• % of unserviceable lights not to exceed 5%
• Recommended not adjacent lights
• Secondary power supply with switchover of
maximum of 1 second
• ILS installations ground and flight checked
Aerodrome Requirements
ATC
• Each Aerodrome to develop Low Visibility
Procedures to include:
– Procedures for ATC to be quickly informed of
all degradations of ILS performance
– Procedures for ATC to be quickly informed of
any degradations in visual aids
– Procedures for protection of OFZ by control of
ground traffic
Aerodrome Requirements
ATC
• Each Aerodrome to develop Low Visibility
Procedures to include:
– Procedures for protection of ILS critical and
sensitive areas and between aircraft
– Procedures for met services
– Procedures for maintenance
– Procedures for security
Air Operator Approval
• Aircraft type - AFM (Certification)
• Aerodrome equipment - qualify
• Aerodrome Operating Minima
• Flight Crew Training
• Flight Crew Procedures
• Maintenance Program
• Operational Demonstration
Air Operator Approval
• Operator take account of:
– aircraft performance
– composition of flight crew
– runway which may be used
– adequacy of visual and non-visual aids
– aircraft navigation equipment
– obstacle clearance height
– availability of met reports
Air Operator Approval
Minima
• Air Operator to ensure DH not lower than:
– DH specified in the AFM
– Minimum DH to which precision approach can
be used
– The OCH for category of aircraft
– The DH for which the flight crew is authorised
– 100ft(30m)
Air Operator Approval
CAT II DH
• An air operator to ensure that DH not
lower than:
–Minimum DH in the AFM
–Minimum DH to which the precision
approach can be used
– The DH to which the crew is authorised
Air Operator Approval
CAT III DH
– ICAO/JAA/FAA slight differences
– RVR Minimum related to DH
– Increase DH Increase RVR
– For RVR values less than 300m a goaround
is assumed in event of auto-pilot
failure
Air Operator Approval
CAT II/III RVR
Air Operator Approval
Flight Crew Procedures
• Satisfactory check of aircraft equipment
• Effect on minima of failures - aircraft and ground
• Procedures for approach, flare and roll-out
• Procedures for failures/warnings
• Minimum visual reference
• Importance of correct seating eye position
• Action to take if visibility deteriorates
Air Operator Approval
Flight Crew Procedures
• Allocation of crew duties to permit PIC to devote
himself to supervision/decision making
• Calls below 200ft - one pilot on instruments at all times
• Requirement for localizer area to be protected
• Use of information relating to wind, turbulence
• Procedures to use for practice approaches
• Information on maximum deviation allowed
Air Operator Approval
Flight Crew Procedures
• Flight preparation procedures
• Approach preparation procedures
• Approach Procedures
• Failures and associated actions
– Continue
– Revert to higher minimum
– Go Around and reassess
Air Operator Approval
Flight Crew Procedures
• Failures - Continue/Revert/Go Around
– > 1000 Continue with higher DH if conditions met
– < 1000 Go around and reassessment
– Below AH go around required for autoland warning
• Abnormal Procedures
　
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