I stand to be corrected as I don't normally use FAA style chartage but.....

 

"S-ILS 1C" ..... Or a straight in ILS to RWY 01C ...& in bold below....a Category II ILS procedure requiring the flight crew to be legally certified & aircraft to be correctly equipped & legally certified to fly the approach.

 

RA 96/12 - This is the Radar Altimeter Setting Height or Decision Height (DH) of 96 feet set against the Radio Altimeter with a corresponding Runway Visual Range (RVR) of 1200 feet.

 

100 - is the HAT or the Height Above Touchdown (in feet) measured against the SERVO Altimeter which (set to the local QNH)...in this case this corresponds to a barometric height of 386 feet Above Mean Sea Level (AMSL)...supplied for info & cross reference only:

 

HAT (100 feet) + TDZE (Touchdown Zone Elevation - 286 feet AMSL) = 386 feet AMSL

 

Now I am feeling 'foggy'!

 

Steve, many thanks for that very detailed answer, which I am still trying to get my head around, but with the Christmas holidays approaching I will be able to switch off work and give it the attention it deserves.

I stand to be corrected as I don't normally use FAA style chartage but.....

 

"S-ILS 1C" ..... Or a straight in ILS to RWY 01C ...& in bold below....a Category II ILS procedure requiring the flight crew to be legally certified & aircraft to be correctly equipped & legally certified to fly the approach.

 

RA 96/12 - This is the Radar Altimeter Setting Height or Decision Height (DH) of 96 feet set against the Radio Altimeter with a corresponding Runway Visual Range (RVR) of 1200 feet.

 

100 - is the HAT or the Height Above Touchdown (in feet) measured against the SERVO Altimeter which (set to the local QNH)...in this case this corresponds to a barometric height of 386 feet Above Mean Sea Level (AMSL)...supplied for info & cross reference only:

 

HAT (100 feet) + TDZE (Touchdown Zone Elevation - 286 feet AMSL) = 386 feet AMSL

 

Now I am feeling 'foggy'!

 

Just to be sure on this matter HAT is height above threshold, right?

 

 

Just to be sure on this matter HAT is height above threshold, right?

 

Correct.