in the Alpha+.2 Rules>#8
8. Strategic Bombing Raids procedure:
• Escorts fire @1, and interceptor casualties are immediately removed.
• Bombers fire @ 1 and interceptors fire @ 2. Remove bomber and interceptor casualties (escorts may be taken as casualties only after all bombers are eliminated).
• Surviving bombers are assigned a specific target (IC, airbase or naval base) if more than one type is in the territory.
• The target fires its AA defenses at the attacking aircraft - @1
• Surviving bombers attack their target, looking for the highest number possible.
When bombing, each Strategic bomber rolls one die.
The number rolled +2 is the total number of hits the target will receive.
Gray chips are placed under the target for each hit received.
Tactical bombers
Tactical Bombers can also conduct bombing raids.
They are limited to attacking only naval bases and airbases, however.
Other wise they follow the exact procedure as strategic bombers presented above.
When bombing they roll one die.
The number rolled is the number of hits the target receives.
Do not add to the dice roll when bombing with tactical bombers.
I hope this answers your question.