Interesting topic, I just had the same discussion with one of my F/O's. Do we set QNH when cleared to alt or do we have to wait for the TL?
In one way or another I was convinced that I read somwhere in the JAR OPS or other official paperwork that we can set QNH when cleared to a alt as long as no level flight above TL was to be expected. Now I do not find this 'evidence' anymore.
Can anyone give me a hint where to find this law/procedure/ICAO rec/....
(It's about a beer
)
Thanks
MD