Read before Entering Published Feb. 7, 2011 By Staff Sgt. Roberto Modelo 911 AW/PA PITTSBURGH IAP ARS -- A grounding panel attached to the internal metal structure of the 911th Aircraft Maintenance Squadron's Fuel Cell Hanger displays instructions needed for personnel entering the hanger. The hanger was the site of the annual fuel extraction exercise held here during the February Unit Training Assembly. The exercise tested the emergency response readiness of both fuel systems specialists and Allegheny County Airport Authority personnel while in the confines of the hazards presented in the hanger.