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The pressurized water extinguishers are located in the stowage box at the crew seat at Door 1 Left, and in the cupboard adjacent to the crew seat at Door 4 Right.
The extinguisher is easily removed from its bracket with one hand. To operate, hold the extinguisher in either hand, slide the (red) safety catch up with the thumb, direct the nozzle toward the base of the fire source, and squeeze the trigger with the palm of the hand. This will cause a piston valve in the operating handle to fracture a frangible plug seal on the top of the container, releasing the extinguishant through the discharge nozzle, which is designed to give a wide, flat pattern. Releasing the trigger closes a secondary seal and interrupts the flow of extinguishant, thus retaining part of the charge without waste, for dealing with flash-backs or re-ignition, should they occur. On first pressing the trigger, a red indicator disc is ejected from the rear of the operating head. This provides a visual indication of partial or complete discharge.
BCF Fire Extinguishers
The BCF fire extinguishers are effective in combating Class A, B, or C, type fires. To operate, first release the safety catch, and then press the trigger. This fractures the frangible seal, discharging the contents through the nozzle. Operation of the trigger also fractures the restraining disk, providing a visual indication that the extinguisher has been used. Once used, a new, recharged container must be installed.
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777 AIRCRAFT MAINTENANCE MANUAL

PORTABLE FIRE EXTINGUISHERS

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