Engine Fire Extinguishing System

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

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