What is different between DH and MDA and DA?!

[Farid]

if anybody explain that things for me i ll appreciated

thank you in advance

[hawker750]

Oh dear, I hope he is not a pilot, but there again I thought this was a forum for pilots

[bookworm]

I'm tempted between

"Are you buying or selling?"

and

"With CDFAs and global warming, less and less as time goes on"

;)

[FatFlyer]

The question may come from a student pilot or PPL,
1)DA decision altitude- the altitude on an ILS approach at which if you do not have the required visual reference to land, you go around.
2)DH decision height- the same as above except with the altimeter set to read height above threshold (QFE) or from a radio altimeter if using this(eg CAT2 or CAT3 approach)
3) MDA minimum descent altitude- the minimum altitude you fly down to on a non precision approach at which (without visual reference) you either go around or maintain till missed approach point or final descent point depending on SOPs.

Just to add confusion, some non precision approaches now publish DAs which can be used if flying a constant descent approach.Also, If you fly a bus, the MDA box is used to set DH if using a barometric minimum.

[Farid]

that was great answer !thank you so much FatFlyer
i was wondering why pilot of airbuses always use MDA filed PREF page on ILS CAT2/3 instead DA!
and
for info of who are worry about my aviation situation!i m probationary first officer at IRAN and i knew enough about DA DH MDA and more...but its my habit to asking, always ,include which i known already because there is always something exist if u want for every thing

[I-2021]

i was wondering why pilot of airbuses always use MDA filed PREF page on ILS CAT2/3 instead DA!

Hey,

you set the baro minima (eg. npa or ILS CAT I) in the MDA box (or BARO box depending on software versions). You set the RA minima in the DH box (eg. CAT II / III app). That's it, no big deals.

Cheers.

[forget]

hawker750 Oh dear, I hope he is not a pilot, but there again I thought this was a forum for pilots

Apart from being rude, you're wrong. It would have taken you less time to answer the question, if able. And, as it happens, Farid is a pilot.

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