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The engine fire bottle (with two squibs) is:

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If the L ENGINE FIRE light extinguishes after moving the left throttle to idle, this indicates a possible:

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Excessive heat by fire or other heat sources expands an inert gas inside the fire-detection loop. The expansion of gas closes a pressure switch that sends a signal to illuminate the left or right ENGINE FIRE light.

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What indications are visible when the rotary TEST knob is placed in the FIRE WARN position?

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A successful test of the fire-detection system using the rotary TEST knob, or illumination of either BOTTLE ARMED light, will confirm that the fire bottle is serviced and full.

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This test of the fire-detection system using the rotary TEST knob, or illumination of either BOTTLE ARMED light, does NOT confirm that the fire bottle is serviced and full. This can only be confirmed by a visual check of the bottle gauge and comparing the reading to a placard that correlates the acceptable pressure/temperature ranges.

If the right side squib fails, fire protection is:

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During the preflight inspection, sufficient engine fire bottle pressure can be determined by:

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The fire-extinguisher bottle contains:

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The bottle has also a safety relief valve that thermally relieves (discharges) if the internal bottle temperature rises above 99 deg.C (210 deg.F).

A pressure sensor is at the end of the fire-detection loop. When the loop is heated by fire or a bleed air leak, the gas in the tube expands, activating the pressure sensor. This produces an electrical signal that provides a warning to the flightcrew. The signal is in the form of L or R ENGINE FIRE lights and MASTER WARNING lights.

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Pressing the R ENGINE FIRE light:

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Citation Mustang – Fire Protection