Not .ord
In Arena Setup > CM Tools there is menu choice for Weapons that allows weapons to be disabled for aircraft on case by case basis
For instance you can disable the 6 gun pack on the F4 Wildcat, or the 1000 lb bomb on an SBD5
Normally when a setting is changed for an arena the text buffer gives a clue as to what variable/flag was changed. In the case of
disabling a certain weapon on a certain plane, the only feed back the text buffer reports is "Weapon Disabled"
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I found it...
.[command] [plane] [group] [slot] [unkown]
.disableweapon 1 1 2 0
That command would disable weapon slot 2 in group 1 for plane 1; disables the 100 lb bombs on the Pony D

edit: that fourth param might be the future ability to disable certain fuel loads...not sure what it is for...use zero as an input