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Major ILS research development

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(Statement by the Minister for Civil Aviation, Mr. R.W. Swartz)

A small group of scientists has achieved a major break through

in research dealing with aircraft instrument landing systems.

The Minister for Civil Aviation (Mr. R.W. Swartz) announced

this today.

Mr. Swartz said that working under a $75,000 Department of

Civil Aviation research grant the group had successfully developed

and tested new glide path and localiser equipment of major significance.

An instrument landing system is used to help a pilot land in

weather through which he must descend "blind" until close to the


It is a complicated electronic system with four basic components -the glide path, the localiser and two marker beacons.

Signals from these are displayed on instruments in the cockpit

to enable the pilot to be directly in line with and at the right angle

of descent to the runway when he breaks through cloud.

Mr. Swartz added that the grant introduced three years ago was

used to create a navigational aids research group within the Electrical

Engineering Department of the Sydney University.

This group was headed by American physicist, Dr. H.W. Redlich.

Dr. Redlich and his team had now developed a new glide path

antenna system known as a "phase reference" glide path.

Normally a large flat area of land was required at the end of a

runway to produce a satisfactory glide path from the standard type of

ILS antenna.

The new "phase reference" system would enable DCA to provide

satisfactory glide paths at airports where this land was obtainable only

at great expense and where descents to very low minima were not required.

The new aerial had been successfully flight tested in an

experimental form at Sydney (Kingsford Smith) Airport.


The aim was to install the new glide path antenna at airports

where an ILS system was needed but where other types of glide path

installation would be unsatisfactory or so expensive as-to be unrealistic.

Mr. Swartz said the group had also developed a new monitor

system for the IDS localiser.

The localiser provided information to enable a pilot to align

his aircraft accurately with the centre line of the runway.

The localiser information was oontinuously checked by a monitor

system to ensure that the accuracy of the system was maintained.

Under the new system known as an integral monitor, the monitor

sensing devices were integral parts of the antenna system, overcoming

the need for separate monitoring aerials to be placed some hundreds

of feet in front of the localiser array.

The integral monitor system was now being built into the new

ILS localiser antenna installed on the extended north-south runway

at Sydney.

DCA engineers had co-operated closely with the navigational

aids research group to ensure the compatibility of the new systems

with international standards and with DCA's safety requirements.

Mr. Swartz added that DCA planned to extend the navigational aids

research grant by a further $100,000 over the next three years.


MAY 1, 1968