Document ID: chunk:federal_register_of_legislation:F2006B06523:body:0:p2
Version: federal_register_of_legislation:F2006B06523
Segment Type: other
Provision Reference: 
Character Range: 2981–4051

OF AIRWORTHINESS DIRECTIVES

            Investigation revealed that the ILS navigation receiver was incorrectly responding to a low-voltage signal from the glideslope ground station to the ILS enable input. The manufacturer of the receiver has determined that certain resistors within the receiver are improperly sized to ensure a correct response to all possible voltage signals. This condition, if not corrected, could result in the ILS navigation receiver providing inaccurate data to the flight crew by falsely indicating a valid signal from the glideslope ground station. The glideslope is the vertical flight path that an aeroplane is to follow when making an ILS landing. Inaccurate data from the ILS navigation receiver could lead to the aeroplane making an approach off the glideslope, which could result in a landing short of the runway or a runway overrun.

 David Alan Villiers
 Delegate of the Civil Aviation Safety Authority 17 January 2000

 The above AD is notified in the Commonwealth of Australia Gazette on 27 January 2000.