Runway analysis Landing distance question
04-24-2019, 03:40 AM
#11
Disinterested Third Party
Joined APC: Jun 2012
Posts: 6,008
Originally Posted by metro-mia
Our airline's runway analysis has a landing distance for landing beyond threshold and another one for landing beyond glide slope. For each distance it has the corresponding maximum weight allowable for that distance/runway.
My question is, what regulation or Ops Spec or other guidance addresses which landing distance you should use?
My assumption is that if you're on a visual approach, perhaps the beyond threshold distance is usable. If an ILS approach is used, perhaps the beyond glide slope distance is requied. However, we all know that one cannot descend below glide slope until necessary for landing. Is the beyond threshold distance ever permitted?
Any opinions or references to where this might be covered would be great.
Thanks!
My question is, what regulation or Ops Spec or other guidance addresses which landing distance you should use?
My assumption is that if you're on a visual approach, perhaps the beyond threshold distance is usable. If an ILS approach is used, perhaps the beyond glide slope distance is requied. However, we all know that one cannot descend below glide slope until necessary for landing. Is the beyond threshold distance ever permitted?
Any opinions or references to where this might be covered would be great.
Thanks!
If you are legally required to land at or beyond the glideslope, why would you calculate distance based on a landing prior to that point?
If you're flying an aircraft of any significant size, don't you have a a minimum threshold crossing height and a valid reason to not spot the numbers and land on the threshold?
Landing distance beyond glideslope is what you should be looking at.
04-24-2019, 05:52 AM
#12
Line Holder
Joined APC: Feb 2009
Posts: 30
Originally Posted by metro-mia
That's what I think as well. Just wondering what the legal "FAA" answer is. 
However, it probably is like most things and depends on the FSDO, POI, region, time of year, airport and who you ask.
Thanks for your reply.
However, it probably is like most things and depends on the FSDO, POI, region, time of year, airport and who you ask.Thanks for your reply.
https://www.faa.gov/other_visit/avia.../SAFO19001.pdf
g. Touchdown Point. The touchdown point used in the performance data assessment reflects the assumed air distance. Operational landing data usually includes an allowance for 1,500 feet or 7 seconds of air distance from the threshold to touchdown. An air distance as short as 1,000 feet may be used IF an operator’s landing assessment procedures include enhancements to minimize the risk of overruns or undershoots, including:
1) Training in touchdown control and short field landing techniques.
2) Identification of required touchdown point and training to assure go-around procedures are initiated if unable to achieve a suitable touchdown point.
3) Approach guidance and runway markings on the specific runway are consistent with a shorter air distance.
4) Operational data (without the need for interpolation) are provided to the crew for the specific runway, conditions, and aircraft landing configuration.
5) The flight techniques assumed in the creation of the performance data used for a shorter air distances are based on flight techniques to be used in the shorter air distance operation.
Thread
Thread Starter
Forum
Replies
Last Post
