How to get player vehicle health in Export.lua

[Toumal]

Hi, I'm trying to get information about the damage state of the player's aircraft from within Export.lua, and can't seem to get this to work. In essence, I want to know if the player's aircraft has sustained *any* damage, or if it's undamaged.
 

    local playerPlaneId = LoGetPlayerPlaneId()
    local playerUnit = LoGetObjectById(playerPlaneId)

    if (playerUnit == false) then
        return
    end
    
    if (playerUnit:getLife() < playerUnit:getLife0()) then
        return
    end

This doesn't work because playerUnit doesn't have a function called getLife. This is probably the completely wrong way to try, I'd appreciate any help!