Originally Posted by
oicur12.again
"climb to and maintain" is my fave, like we are going to climb to 7000' and then just keep on climbing????
Unfortunately, from bitter experience controllers have found that it is not uncommon for the aircraft to climb to the level that they really wanted rather than the intermediate clearance.
If you request a climb using CPDLC in oceanic, you will normally receive a compound message with:
1. MAINTAIN LEVEL
2. AT [fix or time] CLIMB 310
3. REPORT REACHING 310
The initial MAINTAIN LEVEL is because on numerous occasions the aircraft climbs immediately rather than waiting till the position or time. Controllers are also wary of providing a clearance to climb at a time that is more than 10 minutes away as the aircraft 'forgets' to climb. Nowadays with more aircraft carrying ADS-C the automatic reports at least warn the controllers what is happening.