November 25, 201114 yr Dial the field elevation in the MCP. Once 300' below the Missed altitude, you can reset that in the MCP or do it on the Missed, I've seen it SOP both ways. Matt Cee
November 25, 201114 yr Why do CDAP when vnav can get you there? With CDAP, do you have to dial in the threshold altitiude i9n the altitude window so the green banana depicts reaching landing altitude? If so, you do not have the missed approach altitude ready to go. Does not seem like a RW procedure to me even though it is pretty clevor.It is a real approach procedure for an non precision approach.....ONE of many./ LeffeEDIT: Forgot to mention the MDA are usually set + 50 feet, so PNF can adjust to G/A level if G/A at MDA Leif A Mikkelsen **********************
November 25, 201114 yr It is a real approach procedure for an non precision approach.....ONE of many./ LeffeEDIT: Forgot to mention the MDA are usually set + 50 feet, so PNF can adjust to G/A level if G/A at MDACould you please explain me what MDA is exactly, yes, it stands for minimum descent altitude. Isn't that the same as Decision Height? And where should you set the MDA then? And what is G/A?Thanks! Arjen Vandervelde
November 26, 201114 yr The questions you ask are fundamental to instrument flight. The MDA is used in a non precision approach, and is a hard altitude that you can't descend below until you can see the "runway environment". It is an altitude.Decision height (DH) is a place, not an altitude (actually is a height above the threshold), it is used on a precision approach on a glide-slope or other vertical navigation,so is on a fixed path (the approach) at a specific altitude. So, you could almost assign a unique latitude/longitude to a DH,whereas the MDA is just a hard altitude (since there's no defined descent path in a non-precision altitude.One other difference is that an MDA can not be legally broken (descend below), it is a non- negotiable floor altitude that is often flown at level flight as you approach the runway. A DH, however, is a unique place that you reach while on a descent path to the runway, so it is legally possible to bust a DH as you change the flight dynamics to climb on the go-around ( the G/A) that you also asked about.Instrument flight takes any hours to get proficient at,e ven the theory such as this. And lots of $$. This is a very brief response (and most likely technically incorrect in the short time it took me to write it) to a complex subject,but there is a lot of reading material out there if you are serious about learning.Thanks, , Bruce. ASEL, Instrument. KBJC, Colorado.
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