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STUDENT GUIDE FOR T-1A AIRCRAFT SYSTEMS
CHAPTER THREE
Engine Fire Extinguishing System
The system is a single-shot fire extinguishing system that uses two extinguisher bottles
connected through a check valve to each engine compartment. Crewmembers are able to direct
the discharge of either extinguisher bottle, or both bottles, to a selected engine.
Engine Fire Extinguishing Units
Each bottle contains three pounds of Halon and is charged to 600 psi. A pressure sensitive
overboard discharge indicator (red disc) located on the aft fuselage below and aft of the left
engine pylon, indicates fire extinguisher availability. If either or both bottles discharge
overboard, the discharge will blow the disc out, indicating a discharged system.
Fire Extinguisher Switchlights
The engine fire extinguishing system is controlled and annunciated by six switchlights on the
center shroud panel. Two of these switchlights provide detection information and arming
control, two provide valve closure annunciation and backup closure control, and two provide
extinguisher bottle arming annunciation and firing control.
ENGINES
3-7


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