What is the difference between placing wheel chocks on the outer wheels as opposed to the inner wheels of the main landing gear? Recently I am aware of a change made to the IATA Ground Operations Manual (IGOM) in regards to the position of the wheel chock on the main landing gear.



Is there a justification for why one method is preferred or is safer than the other?
If the inner wheels are chocked, the ground crew person would likely have to place their arm/hand in the path of the wheels to grab the rope and pick up the chock.