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#11
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"Roy Smith" wrote in message
... "Gary L. Drescher" wrote: A hundredth-degree change in descent angle is (barely) perceptible on the ASI or VSI. I'd like to see a pilot or VSI which can notice the difference between 500 fpm and 502 fpm. You're right, it would have been more accurate for me to say a *few* hundredths of a degree. But that still justifies more than one decimal place of precision. A few hundredths of a degree change of descent angle moves the VSI needle almost as much as a one-degree heading change moves the HI (and courses are routinely specified with single-degree precision). --Gary |
#12
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Just to avoid potential confusion, the NOTAM has been reworded to include
"Vertical Descent Angle" in front of 3.52 degrees. The previous way had been used for at least 4 years when adding VDA's to non-precision procedures via NOTAMS, but will probably change now since the old appears to lead to confusion. Incidentally, the reason this NOTAM was originally created is that the airport painted new runway numbers (17/35) on the runways due to magnetic variation updates, and Memphis Approach didn't hear about it until after the fact. FDC 3/1417 FI/T GENERAL DEWITT SPAIN, MEMPHIS TN. VOR RWY 16, ORIG... CHANGE ALL REFERENCES TO RWY 16/34 TO RWY 17/35. ADD: FROM SHLBY TO RW17: VERTICAL DESCENT ANGLE 3.52 DEGREES, TCH 31. ADD NOTE: VGSI AND DESCENT ANGLES NOT COINCIDENT. -- JPH "Michael" wrote in message m... Greg Esres wrote One of our local pilots misunderstood a common Notam, as shown below. He thought the "ADD: From Shelby to RW 17: 3.52 degrees" meant add 3.52 degrees to the final approach course. How reasonable do you think his interpretation? For someone coversant with TERPS - not very. For someone who meets the knowledge requirements for the instrument rating but not much more - pretty reasonable. Note the context - the runway numbers are changed (increased). I can easily see how someone might think that this means the final approach course should also be adjusted, and the direction and magnitude of the adjustment are consistent with the runway change. (BTW, the notam just adds a descent gradient to a NP approach.) FDC 3/0143 M01 FI/T GENERAL DEWITT SPAIN, MEMPHIS, TN. VOR RWY 16, ORIG...CHANGE ALL REFERENCES TO RWY 16/34 TO RWY 17/35. ADD: FROM SHLBY TO RW 17: 3.52 DEGREES, TCH 31. ADD NOTE: VGSI AND DESCENT ANGLES NOT COINCIDENT. Not exactly plain English, is it? Michael |
#13
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Just to avoid potential confusion, the NOTAM has been reworded to
include One of my fellow instructors called the Flight Procedures Quality control guru and pointed out the possible confusion. |
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