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Air New Zealand 8199: descent below safe altitude

Printed page label not indexed. PDF page 20.

separate altitude signals with configuration options of ‘baro-corrected altitude', ‘pressure altitude' or ‘both'. The DHC design solution with the ACU only allowed for one altitude signal connection to the FMS so the configuration instructions selected the baro-correct
Open official document at PDF page 20TAIC final report: ZK-NEM

Air New Zealand 8199: descent below safe altitude

Printed page label not indexed. PDF page 45.

in the Q300 was only supplied with baro-corrected air data. Without the provision of pressure altitude data, the full functionality of the FMS was not being utilised as there was no ability for the FMS to calculate a smooth descent
Open official document at PDF page 45TAIC final report: ZK-NEM

Air New Zealand 8199: descent below safe altitude

Printed page label not indexed. PDF page 46.

in altitude and vertical speed. If the FMS is provided with both baro-corrected and pressure altitude, the existing FMS software is designed to automatically detect changes to the difference between them and smooth the transition over about a 30 second
Open official document at PDF page 46TAIC final report: ZK-NEM

Air New Zealand 8199: descent below safe altitude

Printed page label not indexed. PDF page 47.

responded the same month with a message from Honeywell that the DADC does not have the pressure altitude signal available in a digital format. They further advised that production of the model DADC fitted to the Q300 was discontinued from
Open official document at PDF page 47TAIC final report: ZK-NEM

Air New Zealand 8199: descent below safe altitude

Printed page label not indexed. PDF page 86.

calculated a smooth descent through transition. Had the FMS also been provided with a pressure altitude signal, it is very unlikely that this incident would have occurred. 4.6. The practice used by crew to manage the aeroplane's vertical flight path
Open official document at PDF page 86TAIC final report: ZK-NEM

Air New Zealand 8199: descent below safe altitude

Printed page label not indexed. PDF page 89.

in the Q300 was only supplied with baro-corrected air data. Without the provision of pressure altitude data, the full functionality of the FMS was not being utilised as there was no ability for the FMS to calculate a smooth descent
Open official document at PDF page 89TAIC final report: ZK-NEM