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POWERPLANT ORALS

CHAPTER 11 - ENGINE FIRE PROTECTION

QuestionAnswer
WHAT TYPES OF FIRE DETECTOR SYSTEMS ARE USED FOR ENGINE FIRE DETECTION? OVERHEAT, RATE OF RISE, AND FLAME DETECTORS.
HOW DOES A THERMAL SWITCH FIRE PROTECTION SYSTEM OPERATE? WHEN HEATED PAST A PREDETERMINED TEMPERATURE, THE SWITCH CLOSES CAUSING THE WARNING DEVICES IN THE COCKPIT TO ACTIVATE.
HOW MANY THERMAL SWITCHES ARE NEEDED IN A THERMAL SWITCH FIRE PROTECTION SYSTEM? AT LEAST ONE.
WHAT KIND OF FIRE DETECTION SYSTEM ALLOWS MORE COMPLETE COVERAGE THAN SPOT-TYPE SYSTEM? A CONTINUOUS LOOP SYSTEM.
WHAT HAPPENS IF AN ENGINE EQUIPPED WITH A THERMOCOUPLE FIRE WARNING SYSTEM OVERHEATS SLOWLY? NOTHING, BECAUSE A FAST TEMPERATURE RISE OR RAPID HEATING IS REQUIRED FOR THE THIS TYPE OF FIRE SYSTEM TO OPERATE.
WHAT ELECTRICAL POWER IS REQUIRED FOR A THERMOCOUPLE FIRE PROTECTION SYSTEM TO OPERATE? BOTH THE THERMOCOUPLE-PRODUCED POWER AND THE AIRCRAFT ELECTRICAL SYSTEM ARE REQUIRED FOR THIS TYPE OF FIRE PROTECTION SYSTEM TO OPERATE.
WHAT IS THE LIKELY CAUSE OF A FALSE FIRE WARNING? THE ENGINE FIRE SENSING LOOP IS BENT OR KINKED EXCESSIVELY.
WHAT ARE FIRE EXTINGUISHING SYSTEMS DESIGNED TO DO? THEY ARE DESIGNED TO DILUTE THE OXYGEN LEVELS AROUND THE ENGINE TO A POINT THAT DOES NOT ALLOW COMBUSTION, OR TO REDUCE TEMPERATURES BELOW THE IGNITION POINT.
DESCRIBE HOW THE KIDDE FIRE PROTECTION SYSTEM FUNCTIONS. TWO CONDUCTERS EMBEDDED IN A THERMISTOR MATERIAL. 1 WIRE IS ELECTRICALLY GROUNDED TO OUTER TUBE AT EACH END, ACTS AS AN INTERNAL GROUND. OTHER IS A POSITIVE LEAD. A FIRE OR OVERHEAT OCCUR, RESISTANCE OF THERMISTOR DROPS. CURRENT FLOWS. ACTIVATES ALARMS.
DESCRIBE HOW THE FENWEL CONTINUOUS LOOP FIRE SYSTEM FUNTIONS. A SINGLE WIRE ELECTRODE SURROUNDED BY CERAMIC BEADS. BEADS PREVENT ELECTRODE AND TUBE FROM TOUCHING. CURRENT APPLIED TO ELECTRODE. THE OUTER TUBE IS GROUNDED TO AIRCRAFT STRUCTURE. A FIRE OR OVERHEAT OCCUR, RESISTANCE OF BEADS DROPS. CURRENT FLOW, ALARM.
WHAT ELEMENTS MUST BE PRESENT FOR A FIRE TO OCCUR? AN IGNITION SOURCE SUCH AS HEAT OR A SPARK, FUEL AND OXYGEN.
WHAT GROUP OF FIRE EXTINGUISHING AGENTS ARE NO LONGER MANUFACTURED BECAUSE OF ENVIRONMENTAL CONCERNS? HALONS (OR FREON OR CHLOROFLUOROCARBONS [CFCS]) WERE NO LONGER MANUFACTURED AFTER 1995. HOWEVER EXISTING STOCKS OF CFC MAY STILL BE USED AND ARE SUBJECT TO STRICT HANDLING AND DISPOSAL REGULATIONS.
HOW ARE FIRE EXSTINGUISHING AGENTS DISTRIBUTED? THROUGH PERFORATED TUBING AND/OR DISCHARGE NOZZLES.
WHAT IS THE PURPOSE OF THE DISCHARGE CARTRIDGE AND HOW IS IT ACTIVATED? THE DISCHARGE CARTRIDGE, OR SQUIB, WHICH IS ELECTRICALLY IGNITED, FIRES A PROJECTILE INTO THE FRANGIBLE DISK, THEREBY RELEASING FIRE EXTINGUISHING AGENT.
HOW IS A FIRE EXTINGUISHER SYSTEM WITH A HIGH RATE OF DISCHARGE CLASSIFIED? AS AN HRD FIRE EXTINGUISHER SYSTEM.
WHAT DO THE RED AND YELLOW DISCS IN A FIRE EXTINGUISHING SYSTEM INDICATE? A YELLOW DISC INDICATES A NORMAL DISCHARGE. A RED DISC IDICATES A THERMAL DISCHARGE.
HOW IS THE FIRE EXTINGUISHING AGENT IN AN HRD SYSTEM DISTRIBUTED, AND HOW LONG DOES IT TAKE TO DISCHARGE? THE AGENT IS DISTRIBUTED THROUGH A SERIES OF HIGH PRESSURE TUBE AND TAKES ONE TO TWO SECONDS TO DISCHARGE.
WHAT IS THE PURPOSE OF A PRESSURE WITHIN THE CONTAINER? INDICATES PRESSURE WITHIN THE CONTAINER. TO CHECK IF THE PRESSURE IS WITHIN LIMITS, A PRESSURE-TEMPERATURE CHART IS USED.
Created by: brookburns34924
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