Question:
In a hex that has a 3-capacity airfield can three construction units each augment the airfield at the same time? In is way the 3-capacity airfield goes from a capacity of 3 to 12 in one construction cycle.
Answer:
No, Rule 14A1 states that engineers can augment an existing airfields capacity by 3. In your example, the engineers are clearly augmenting the airfield by more than 3 (by 9, in fact) and this is illegal. No matter how many engineers are present, they may only augment an airfield’s capacity by 3 in anyone turn.
Source:
TEM 53

