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Tuesday, 8 November 1977
Page: 3111

Mr Neil (ST GEORGE, NEW SOUTH WALES) asked the Minister for Transport, upon notice, on 20 October 1977:

(   1 ) Is a record kept of whether or not pilots of aircraft lock on to the automatic landing navigation approach beam at Sydney Airport.

(2)   If so, will he provide figures of the heights at varying distances from the airport on the approach from the south, and, in particular, provide the height of the beam above Hurstville, Bexley and Arncliffe.

(3)   Are any records kept of variations from the beam and any requirements to order aircraft to either adjust to the beam or make another approach.

(4)   When locked on to the beam, within what tolerance of the specified angle are aircraft allowed to operate on the landing approach.

Mr Nixon - The answer to the honourable member's question is as follows:

(1)   There is no record kept at Sydney Airport as to whether pilots lock on to the instrument landing system (ILS) during final approach. However, nearly all approaches into Sydney Airport on any one of the three runways equipped with an ILS would use the ILS and/or the visual approach guidance system for final approach.

(2)   (a) For the approach on to runway 07 which tracks over or near the suburbs mentioned, the height in feet above mean sea level of the glide path at a distance in nautical miles measured by the Distance Measuring Equipment sited on the airport is as follows:


(b)   For the specific suburbs mentioned, the following are the heights in feet that an aircraft tracking accurately on the ILS along the extended centreline of runway 07 would be above these places:


(3)   There arc no records kept of any aircraft which has varied from the normal glide path nor of any aircraft being asked to adjust to the glide path if they have varied from it.

There is no equipment on the airport which is capable of monitoring or recording this type of information. There is a requirement for aircraft to be on the glide path when using the ILS. There are occasions when a departmental aircraft will fly lower than the normal glide path angle when the system is being checked and this would occur approximately every three months.

(4)   The allowable tolerance for licence purposes for pilots to be able to use an ILS is + or - 0. 1 5 0 from the actual glide path. Normally pilots would manually fly to less than this tolerance and an aircraft locked on to the approach beam using its automatic equipment would certainly vary much less than this tolerance.

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