On IFR—When to change altimeter setting

On IFR—When to change altimeter setting

Postby Tol3458 » Sun Nov 04, 2018 8:14 pm

You’re flying IFR into an uncontrolled airport. Enroute ATC asks that you report when you have the local weather and requests what approach you’d like. Still 50 miles from the IAF you pick up the ASOS and decide on the ABC approach and note that the local altimeter is .4-.5 inches below (-400-500 feet) the enroute setting you’ve been given, a not insignificant amount given terrain surrounding the airport. You are then cleared for the approach and told to report when established inbound. At what point do you change your altimeter setting?

1) When cleared for the approach
2) Upon crossing the IAF
3) when established
Tol3458
 
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Re: On IFR—When to change altimeter setting

Postby zerofay32 » Mon Nov 05, 2018 7:01 am

4)When picking up the ASOS/AWOS.

A .4 or .5 change is pretty large and would be an indicator of other potential issues (like flying into a Hurricane ;) ).
Andrew Fay
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Commercial Pilot/Instrument ASEL- KOSU / Commercial sUAS-DJI S900
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