Historically non precision approaches reference ground navigation aids that exhibit a degree of inaccuracy, which is often enhanced by the poorly defined vertical path published on an approach chart NPA charts typically provide only an assigned altitude at the FAF and the distance from the FAF to the MAP. Both methods assume that the aircraft is being flown in landing configuration at the final approach speed (VaPP) from the final approach fix (FAF) to the landing initiation of the missed approach. Control of the vertical path uses two different methods: the step-down method and the constant descent method. This occurrence highlights the importance of crews effectively monitoring their aircraft’s flight profile to ensure that descent is not continued through an intermediate step-down altitude when conducting a non-precision approach ( Australian Transport safety Bureau, 2013).ĭetermining the correct rate of descent (RoD) or vertical speed (V/S) is a critical attribute if an aircraft is to arrive at the correct altitude and avoid excessive descent rates. Any loss of vertical situation awareness increases the risk of controlled flight into terrain. No enhanced ground proximity warning system alerts were generated, as the alerting thresholds were not exceeded.ĭuring those phases of flight when terrain clearance is unavoidably reduced, such as during departure and approach, situation awareness is particularly crucial. The crew identified the deviation and levelled the aircraft until the correct descent profile was intercepted, then continued the approach and landed. Shortly after becoming established on the final approach course with the aircraft’s automatic flight system engaged, the flight crew descended below the minimum safe altitude for that stage of the approach. The flight was at night with rain showers and scattered cloud in the Canberra area.
Due to scheduled maintenance the instrument landing system at Canberra was not available and the crew prepared for an alternate instrument approach that provided for lateral but not vertical flight path information. On 12 February 2012, the flight crew of a Boeing 737 aircraft, registered VH-TJS and operated by Qantas Airways Limited, was conducting a scheduled passenger service from Sydney, New South Wales to Canberra, Australian Capital Territory. Please consider sending a few dollars ( Thank You.) All funds donated will be used to offset the cost of server and website hosting. Maintaining this website costs a considerable sum of mony each year. The definition of the acronym OEM is Original Equipment Manufacturer ( aka real aicraft part). I use the words 'modules & panels' and 'CDU & FMC' interchangeably. Do not complain if you do not like what you read. All reviews and content are 'frank and fearless' - I tell it as I see it. Note: I have NO affiliation with ANY manufacturer or reseller. I hope there are not too many spelling and grammatical mistakes. Writing for a cross section of readers from differing cultures and languages with varying degrees of technical ability, can at times be challenging.
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