TM  1-1520-240-10            2-2-1 SECTION  II.  EMERGENCY EQUIPMENT 2-2-1.  Emergency Procedures. Refer to Chapter 9 for all emergency procedures. 2-2-2.  Engine Compartment Fire Extinguisher Sys- tem. The engine compartment fire extinguisher system (fig. 2-2-1) enables the pilot or copilot to extinguish a fire in either  engine  compartment  only.  It  is  not  designed  to extinguish internal engine fires. The system consists of two FIRE PULL handles, an AGENT DISCH (agent dis- charge) switch, a FIRE DETR (fire detector) switch on the center instrument panel, and two extinguisher agent con- tainers on the overhead structure at stations 482 and 502. The containers are partially filled with monobromo- trifluoromethane (CBrF3 or CF 3BR) and pressurized with nitrogen (table 2-2-1 provides the range of engine fire extinguisher pressures.) The agent in one or both of the containers    can    be    discharged    into    either    engine compartment. Selection of the compartment is made by pulling the appropriate FIRE PULL handle. In figure 2-2-1 the ENG 1 FIRE PULL handle has been pulled. Selection of the container is made by placing the AGENT DISCH switch in the appropriate position. In figure 2-2-1, BTL 1 has been selected. 2-2-3.  FIRE PULL Handles. WARNING Before flying the aircraft ensure that each FIRE PULL handle NVG filter holder can be rotated from the closed to the open posi- tion without causing the FIRE PULL han- dle to be pulled. Improper handling of the NVG  filter  holder  may  cause  the  FIRE PULL handle to be pulled unintentionally, thus fuel to the affected engine will be shut off and the engine will shut down. Do not use sudden or excessive force when rotat- ing the FIRE PULL handle NVG filter hold- er from the closed to the open position. Two control handles for the engine fire extinguisher sys- tem (fig. 2-2-1) are labeled FIRE PULL - FUEL SHUT- OFF on the top center section of the center instrument panel. Each handle has a cover for the NVG filter, two warning lights, and the necessary control switches that close the engine fuel shutoff valve and arm the fire extin- guisher system circuits. Power is supplied for each FIRE PULL handle from the respective No. 1 and No. 2 DC essential buses through the respective ENGINE NO. 1 and NO. 2 FUEL SHUTOFF circuit breakers on the No. 1  and  No.  2  PDP.  Power  is  supplied  for  each  pair  of warning lights from the corresponding No. 1 or No. 2 AC bus through the ENGINE NO. 1 and NO. 2 FIRE DET circuit breakers on the No. 1 and No. 2 PDP. Table  2-2-1. Engine Compartment Fire Extinguisher Pressures AMBIENT TEMPERATURE (C) MINIMUM INDICATION (PSI) -54_ 271 -51_ 275 -40_ 292 -29_ 320 -18_ 355 -7_ 396 4_ 449 15_ 518 27_ 593 38_ 691 52_ 785