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#71
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SAC ILS "ADF Required" Info
Steven P. McNicoll wrote:
"JPH" wrote in message news:TjYog.11140$f76.5031@dukeread06... Good question. I'm sure that will be an option in the not too distant future, but right now you can't mix and match ground-based systems with GPS on published procedures due to TERPS requirements. That's another set of guidelines that allows substitution with GPS in some circumstances, and already you may have seen NOTAMS stating "Procedure NA except for IFR certified GPS equipped aircraft" where the NOTAM specifically allows substitution for DME or ADF ancillary equipment. It's an option now. See AIM para 1-1-19.f.: http://www.faa.gov/atpubs/AIM/Chap1/aim0101.html#1-1-19 I realize that GPS can be used as a substitute, and pointed that out in my message. His question was why the ground based procedure didn't have a chart note "ADF or GPS required". What I was stating is that TERPS criteria does not yet allow combining ground based and GPS on the chart, that's why the procedure does not say "ADF or GPS required" (A temporary NOTAM can address GPS but the chart can not). As I said, you can use GPS to substitute in some situations based on regulations other than TERPS, but TERPS criteria does not yet allow GPS notes to be charted on ground based procedures (except on the old GPS overlay procedures). TERPS criteria still requires ground based procedures to be built based only on ground based equipment, so your not going to see a "GPS required" note on a ground based procedure. JPH |
#72
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SAC ILS "ADF Required" Info
"JPH" wrote in message news:EEmpg.11443$f76.5591@dukeread06... I realize that GPS can be used as a substitute, and pointed that out in my message. You did? Where? His question was why the ground based procedure didn't have a chart note "ADF or GPS required". What I was stating is that TERPS criteria does not yet allow combining ground based and GPS on the chart, that's why the procedure does not say "ADF or GPS required" (A temporary NOTAM can address GPS but the chart can not). As I said, you can use GPS to substitute in some situations based on regulations other than TERPS, but TERPS criteria does not yet allow GPS notes to be charted on ground based procedures (except on the old GPS overlay procedures). TERPS criteria still requires ground based procedures to be built based only on ground based equipment, so your not going to see a "GPS required" note on a ground based procedure. "ADF OR GPS REQUIRED" would just add unnecessary clutter as it's already understood that GPS can substitute for ADF in cases like this. |
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