Cat IIIB in A320
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Cat IIIB in A320
While doing a Cat III B approach in A 320 it is required to give a callout at 1000ft. Does this have to be on the Pressure Altimeter or on RA? Can someone please clarify and also give the reason. Thanks.
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Radio Altimeter. The reference is 1000 ft AAL, if you're landing at an airport with an elevation of, let's say, 2000 ft You will never (hopefully) see 1000 ft indicated on your baro PFD.
I know nothing about the 'bus so can't give a techie answer but just a thought that for low vis Ops 1000 feet AAL is the approach ban point (e.g "do we have the RVRs to go any further", and associated questions).
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Does this have to be on the Pressure Altimeter or on RA?
Unless the terrain is flat, the radio ALT will indicate the approach ban point at the wrong point. (e.g. Geneva RW05 over lumpy terrain, RW23 over a flat lake)
It will depend on your company SOPs ......however it should be 1000 ft above elevation based on the baro readout. i.e. LGW airfield elevation approx 200 ft, Call "1000" when passing 1200 on the baro.
Last edited by Right Way Up; 30th Jan 2017 at 13:41. Reason: Goldenrivett just beat me to it ;)
It will depend on your company SOPs
Only half a speed-brake
@Boyington: I believe all the FCOM references for LVP say RA, this is however not entirely correct. The author, probably for simplicity, omits the possible terrain characteristics.
Normally all 1000 ft references (approach ban, stabilized policy, ECAM quarantine) should be based on AAL, or above THR ELEV. SOP between companies may vary.
@Denti: how cool is that!
Normally all 1000 ft references (approach ban, stabilized policy, ECAM quarantine) should be based on AAL, or above THR ELEV. SOP between companies may vary.
@Denti: how cool is that!
On the A300 the "1000ft Radio" Altitude call was to alert you to look for the AFCS going from "Land Arm Amber" to "Land Arm Green" at 700ft.
We were only Cat3A but I wonder if it is the same logic.
We were only Cat3A but I wonder if it is the same logic.