Originally Posted by
Hoangminh90
When i did a instrument checked and i know that the tolerance between 2 NDs is 4 degree . But we also checked on the stanby compass . Sometimes it exceed 4 and i could not find the tolerance for stby compass ( on FCOM )
There is no Airbus operational procedure to check the standby compass, therefore you will not find any limits in FCOM.
As long as your airline requires you to make the crosscheck, they need to give you some limiting values themselves, as well as proposed course of action on what to do next.
Originally Posted by
Hoangminh90
When we are under radar control during approach , what is the maximum speed we can exceed ( select on pfd ) folowed by atc speed clearance ?
As accurately as possible. No
intentional difference between actual speed and instructed speed should be made.
This is, of course quite impractical in a limited number of certain situations. I like the guidance provided by CAA Netherlands for Amsterodam Schipol Airport: Speeds above 220 kt (are to be) accurate within 10 kt, speeds below 220 kt within 5 kt.
My personal procedure is to fly as accurately as I can, if different speed is desired, always ask - pilot and ATC workload permitting.
NOTE: you ask about PFD selected speed, I believe the actual indicated speed is the point of discussion.
