Proper phraseology to request deletion of SID and 250/10k speed constraints?

[parishiltons]

ICAO Annex 10 Vol II Ch 5 does not provide any guidance, so looking now to ICAO Doc 4444 PANS-ATM 6.3.2.4 we have

ATC "CLIMB VIA SID TO (level). CANCEL SPEED RESTRICTIONS".

This is also published in AIP GEN 3-4.

So although ICAO/AIP does not actually say so explicitly, the corresponding pilot initiating phraseology would logically be "REQUEST CANCEL SID SPEED RESTRICTIONS" or even more specifically in your case "REQUEST CLIMB AT 280KT". This will also indicate to ATC that it is only for the climb phase of flight, not the rest of it, and takes away any ambiguity about cruise and descent, IAS vs Mach etc.

A contributor above refers to the Brit CAP 413, which provides different phraseology:
"Wrayton Control, BIGJET 347, request (number) knots due configuration"
"BIGJET 347, (number) knots approved",

HOWEVER, CAP 413 does not correctly reflect the 2016 ICAO changes to SID/STAR phraseologies (CLIMB VIA SID etc), and the UK has not nominated this as a difference from ICAO.