Let's say you are 10,000 feet on an IFR flight plan and ATC tells you to fly direct to a high altitude VOR that is greater than 40 NM away. ..IE... you are beyond the Standard Service Volume of the VOR according to the AIM. You tune and identify it, center the CDI...all looks good...BUT...Because you are not on a published route and you are beyond the Standard Service Volume of 40 NM and you are a slant Alpha (IE...no RNAV or GPS)...are you allowed to accept the clearance or legally should you remind ATC you are a slant A and request a vector until able? Refer to AIM 1-1-8(a). I'm looking for legality here rather than practicality. Practiaclly...yeah...just center the CDI and go to the VOR... but is it legal if you are beyond the Standard Service Volume?Thanks in advance for all sincere responces.