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Nos approach charts. Meaning of 10 mi ring.
| Attributes | |
| ACN | 296749 |
| Time | |
| Date | 199502 |
| Day | Mon |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : cmh |
| State Reference | OH |
| Person 1 | |
| Affiliation | government : faa |
| Function | other personnel other |
| Qualification | controller : radar |
| ASRS Report | 296749 |
| Person 2 | |
| Affiliation | government : faa |
| Function | other personnel other |
| Qualification | other other : other |
| Events | |
| Independent Detector | other controllera |
| Resolutory Action | none taken : unable |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Chart Or Publication |
| Air Traffic Incident | other |
Narrative:
Today I got into a discussion with some of my fellow controllers concerning nos approach plates and altitudes to fly. The discussion dealt with the 10 NM distance circle on nos instrument approach plates, and what it means. Our discussion centered on the NDB runway 4 approach to bolton airport (2i4) here in columbus, ohio. All of my fellow controllers that I spoke with insisted that the 'remain within 10 NM' notation on the nos approach plate profile view is coincident with the '10 NM distance circle' on the plan view. In other words, they insist, as in 2i4's NDB runway 4 approach, that the pilot is safe to fly at 2700 ft -- anywhere -- within that 10 NM circle. While I agree that it is safe to fly at that altitude in this particular case, I disagreed, saying that the '10 NM distance circle' should not be relied upon for safe altitude information. I insisted that it is not designed for this purpose. While I feel certain about this, I'm at a loss to find anything definitive on the purpose of that '10 NM distance circle.' what purpose does it serve on the nos charts? Callback conversation with reporter revealed the following information: ATP 210 specialist stated the meaning of the 10 mi ring was nothing more than showing information contained in the ring is drawn to scale. This information is contained in specification book not readily available to public. Reporter was called and informed.
Original NASA ASRS Text
Title: NOS APCH CHARTS. MEANING OF 10 MI RING.
Narrative: TODAY I GOT INTO A DISCUSSION WITH SOME OF MY FELLOW CTLRS CONCERNING NOS APCH PLATES AND ALTS TO FLY. THE DISCUSSION DEALT WITH THE 10 NM DISTANCE CIRCLE ON NOS INST APCH PLATES, AND WHAT IT MEANS. OUR DISCUSSION CTRED ON THE NDB RWY 4 APCH TO BOLTON ARPT (2I4) HERE IN COLUMBUS, OHIO. ALL OF MY FELLOW CTLRS THAT I SPOKE WITH INSISTED THAT THE 'REMAIN WITHIN 10 NM' NOTATION ON THE NOS APCH PLATE PROFILE VIEW IS COINCIDENT WITH THE '10 NM DISTANCE CIRCLE' ON THE PLAN VIEW. IN OTHER WORDS, THEY INSIST, AS IN 2I4'S NDB RWY 4 APCH, THAT THE PLT IS SAFE TO FLY AT 2700 FT -- ANYWHERE -- WITHIN THAT 10 NM CIRCLE. WHILE I AGREE THAT IT IS SAFE TO FLY AT THAT ALT IN THIS PARTICULAR CASE, I DISAGREED, SAYING THAT THE '10 NM DISTANCE CIRCLE' SHOULD NOT BE RELIED UPON FOR SAFE ALT INFO. I INSISTED THAT IT IS NOT DESIGNED FOR THIS PURPOSE. WHILE I FEEL CERTAIN ABOUT THIS, I'M AT A LOSS TO FIND ANYTHING DEFINITIVE ON THE PURPOSE OF THAT '10 NM DISTANCE CIRCLE.' WHAT PURPOSE DOES IT SERVE ON THE NOS CHARTS? CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: ATP 210 SPECIALIST STATED THE MEANING OF THE 10 MI RING WAS NOTHING MORE THAN SHOWING INFO CONTAINED IN THE RING IS DRAWN TO SCALE. THIS INFO IS CONTAINED IN SPEC BOOK NOT READILY AVAILABLE TO PUBLIC. RPTR WAS CALLED AND INFORMED.
Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.