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AIRFRAME ORALS
CHAPTER 16 - FIRE PROTECTION SYSTEMS
| Question | Answer |
|---|---|
| BRIEFLY DESCRIBE THE COMPONENTS OF A THERMAL SWITCH FIRE DETECTION SYSTEM. | TEMPERATURE SENSITIVE SWITCHES THAT COMPLETE A CIRCUIT AT A SPECIFIC TEMPERATURE AND TRIGGER A WARNING. |
| ARE THERMAL SWITCHES WIRED IN SERIES OR IN PARALLEL WITH EACH OTHER? | PARALLEL. |
| HOW ARE THE DETECTOR UNITS IN A DOUBLE-LOOP FENWAL SYSTEM WIRED? | IN PARALLEL BETWEEN TWO COMPLETE LOOPS OF WIRING. |
| IN WHAT WAY IS A THERMOCOUPLE FIRE WARNING SYSTEM DIFFERENT FROM A THERMAL SWITCH SYSTEM? | THERMOCOUPLE SYSTEMS ARE SENSITIVE TO THE RATE OF TEMPERATURE CHANGE, WHERAS THERMAL SWITCH SYSTEMS RESPOND TO A SPECIFIC TEMPERATURE VALUE. |
| BRIEFLY DESCRIBE THE COMPONENTS OF A KIDDE CONTINUOUS LOOP FIRE DETECTION SYSTEM. | A KIDDE SYSTEM HAS INCONEL LOOP WHOSE RESISTANCE CHANGES WITH TEMPERATURE. |
| DESCRIBE THE PROCESS OR MECHANISM BY WHICH A PHOTOELECTRIC SMOKE DETECTOR GENERATES A WARNING OF A POSSIBLE. | SMOKE PARTICLES REFRACT LIGHT IN THE DETECTOR UNIT CAUSING THE PHOTOELECTRIC CELL TO CONDUCT ELECTRICITY AND TRIGGER THE ALARM. |
| HOW CAN THE OPERATION OF A PHOTOELECTRIC SMOKE DETECTOR BE TESTED? | BY ACTUATING A TEST SWITCH. |
| NAME TWO TYPES OF SMOKE DETECTION SYSTEMS USED IN AIRCRAFT. | LIGHT REFRACTION (PHOTOELECTRIC) TYPES AND IONIZATION TYPES. |
| WHAT ARE THE USUAL LOCATIONS WHERE A CARBON MONOXIDE DETECTOR WOULD BE INSTALLED? | IN AN AIRCRAFT CABIN OR COCKPIT. |
| HOW DOES A CARBON MONOXIDE DETECTOR TURNS GRAY OR BLACK. | THE TAN SPOT ON THE DETECTOR TURNS GRAY OR BLACK. |
| WHAT ARE THE POSSIBLE EFFECTS OF KINKS AND SHARP BENDS IN THE SENSING ELEMENTS(S) OF A FIRE WARNING SYSTEM? | FALSE FIRE WARNINGS CAUSED BY SHORT CIRCUITS. |
| HOW IS FREON CONTAINER CHECKED FOR PROPER PRESSURE? | A CHART MUST BE USED TO DETERMINE THE MAXIMUM AND MINIMUM GAUGE PRESSURE READINGS BASED ON THE AMBIENT TEMPERATURE. |
| NAME THE TWO BASIC TYPES OF FIRE EXTINGUISHING SYSTEMS. | THE CONVENTIONAL SYSTEM AND THE HIGH-RATE DISCHARGE SYSTEM. |
| NAME THE EXTINGUISHING AGENT MOST COMMONLY USED BY CONVENTIONAL FIRE EXTINGUISHING SYSTEMS. | CARBON DIOXIDE. |
| NAME THE EXTINGUISHING AGENT MOST COMMONLY USED BY HIGH-RATE DISCHARGE FIRE EXTINGUISHING SYSTEMS. | HALON (HALOGENATED HYDROCARBON TYPE AGENTS), ALSO KNOWN AS FREON. |
| HOW ARE FREON BOTTLES PROTECTED FROM EXCESSIVELY HIGH TEMPERATURES AND HOW CAN YOU TELL THAT THIS HAS OCCURRED? | A THERMAL FUSE (OR BLOWOUT DISK) WILL RELEASE THE AGENT IF THE BOTTLE TEMPERATURE EXCEEDS A CERTAIN LIMIT. THIS BLOWS OUT A RED INDICATOR DISK. |
| WHAT CONDITION IS INDICATED IF THE YELLOW DISK IS MISSING IN A FIRE EXTINGUISHING SYSTEM? | THE SYSTEM HAS BEEN DISCHARGED NORMALLY. |
| DESCRIBE THE MECHANISM BY WHICH A FREON BOTTLE IS DISCHARGED. | AN ELECTRICAL SIGNAL FIRES AN EXPLOSIVE SQUIB, WHICH RUPTURES A FRANGIBLE DISK. |
| HOW IS THE SERVICE LIFE OF A DISCHARGE CARTRIDGE CALCULATED? | FROM THE DATE STAMPED ON THE CARTRIDGE BY THE MANUFACTURER. |
| BRIEFLY DESCRIBE THE COMPONENTS AND OPERATION OF A LINDBERG FIRE DETECTION SYSTEM. | A STAINLESS STEEL TUBE CONTAINS AN INERT GAS AND A DISCRETE MATERIAL THAT ABSORBS SOME OF THE GAS. WHEN THE TUBE HEATS UP, SOME GAS IS RELEASED, RAISING THE PRESSURE IN THE TUBE, WHICH ACTIVATES A PRESSURE SWITCH. |
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