Boston Fire Department Special Signals ( Struck Identical to a BOX ) 10 - 12 No Public School 10 - 13 No Drill School 10 - 14 No Fire College 10 - 15 Display National Standard at Half-Mast 10 - 16 No In-Service or Hydrant Inspections 10 - 17 Period of Unrest 10 - 18 Riot Condition 10 - 19 Riot Condition Terminated, Resume Normal Operations 10 - 25 Emergency Mobilization Alert / Actions Terminated 10 - 26 Divide Two Unit Engine Companies into Single Units 10 - 27 Normal Operation of Engine Companies 10 - 31 High Pressure System out of Service 10 - 32 High Pressure System in Service 10 - 33 Engine Co's respond with Wagons Only, to Alarms in High Pressure Areas 10 - 34 Engine Co's respond with Full units, to Alarms in High Pressure Areas 10 - 43 General Radio Broadcast 10 - 51 Hazardous Driving Conditions 10 - 52 Hazardous Driving Conditions, Affix Cains to Department Vehicles 10 - 53 Department Radio Out of Service 10 - 54 Department Radio Back in Service 10 - 61 Emergency Mobilization Alert exists 10 - 66 Maintain 1 Officer and 5 Firefighters for Oncoming Tour 10 - 67 Maintain 1 Officer and 6 Firefighters for Oncoming Tour District and Division Aides will remain on Duty 10 - 68 Maintain 2 Officers and 6 Firefighters for Oncoming Tour District and Division Aides will remain on Duty 10 - 69 ALL MEMBERS REMAIN ON DUTY 10 - 71 Group 1 Mobilized - Return to Duty 10 - 72 Group 2 Mobilized - Return to Duty 10 - 73 Group 3 Mobilized - Return to Duty 10 - 74 Group 4 Mobilized - Return to Duty 10 - 75 All off Duty Members Return to Duty, except those on Vacation or Leave 10 - 81 Suspend Normal Running Card - Covering Assignments 10 - 82 Resume Normal Running Card - Covering Assignments 999 Test Signal for Tapper Transmitter -/Vuarnet International/- 617/527.oo91 24oo-16.8k HST/V32bis