Norwood Memorial Airport (Mass.) manager Russ Maguire has proposed rules for helicopter operations that he says will improve safety, access and efficiency. But ­several based helicopter companies and owners claim the rules would severely and unfairly limit their operations. At least one operator, Blue Hill Helicopter, says the rules could drive its pilot training business off the airport. One of the proposals would disallow use of the FBO ­helicopter ramp by transient operators without written permission from the FBO and the airport manager. Another proposal would prohibit helicopter operations on certain taxiways. An attorney for two airport tenants alleges that the rules are “discriminatory” and violate not only lease agreements but FAA grant assurances as well. An informal session will be scheduled among the stakeholders to explore other options for achieving the airport’s intended goals.