The FAA has said it might raise decision heights on instrument approaches at Hanscom Field, Boston’s primary general aviation reliever airport in Bedford, Mass., because of tall trees infringing on the runways’ extended centerlines. Local citizens’ groups have retained an attorney to try to block FAA plans to trim the trees–perhaps indefinitely. Though it was unclear at press time which may be affected, approaches at BED include ILSs to Runways 11 and 29 and VOR, NDB and GPS approaches to Runways 11, 23 and 29. No timetable has been set for either cutting the trees or raising the minimums on the approaches.