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AIRFRAME ORALS
CHAPTER 8 - HYDRAULIC AND PNEUMATIC POWER SYSTEMS
| Question | Answer |
|---|---|
| WHAT MATERIALS FORM THE BASES OF THE THREE TYPES OF HYDRAULIC FLUIDS? | VEGETABLE, MINERAL, AND PHOSPHATE-ESTERS. |
| WHAT COLORS DENOTE MINERAL-BASED AND PHOSPHATE-ESTER BASED FLUIDS ? | MINERAL BASED FLUIDS ARE RED AND PHOSPHATE-ESTER BASED FLUIDS ARE LIGHT PURPLE. |
| WHAT ARE THE RESULTS OF EXPOSING LACQUERS, OIL-BASED PAINT, PLASTIC RESINS, AND VINYL COMPOUNDS TO PHOSPHATE-ESTER BASED HYDRAULIC FLUID? | THE MATERIALS WILL BE DAMAGED AND/OR SOFTENED, OR THE PAINT WILL PEEL. |
| NAME SEVERAL SOURCES USED TO DEVELOP HYDRAULIC PRESSURE. | HAND PUMP, ENGINE-DRIVEN PUMPS, AND ELECTRICALLY DRIVEN PUMPS. |
| WHAT WOULD CAUSE THE BYPASS VALVE IN A HYDRAULIC FILTER TO OPEN AND ALLOW UNFILTERED FLUID TO CIRCULATE IN THE SYSTEM? | A CLOGGED FILTER ELEMENT. |
| DESCRIBE SEVERAL METHODS OF PRESSURIZING A HYDRAULIC RESERVOIR. | ENGINE BLEED AIR, SYSTEM PRESSURE ACTING ON A SMALL PISTON IN THE RESERVOIR, USING VARIABLE-DISPLACEMENT HYDRAULIC PUMPS. |
| WHAT FEATURE PREVENTS ENGINE DAMAGE IF AN ENGINE-DRIVEN HYDRAULIC PUMP SEIZES OR IS OVERLOADED? | A SHEAR SECTION IN THE PUMP DRIVESHAFT WILL BREAK, DISCONNECTING THE PUMP FROM THE ENGINE. |
| DESCRIBE THE PURPOSE OF A PRESSURE RELIEF VALVE. | PRESSURE RELIEF VALVES LIMIT THE MAXIMUM PRESSURE PRODUCED BY THE PUMP, THEREBY PREVENTING FAILURES OF THE SYSTEM COMPONENTS. |
| ENGINE-DRIVEN PUMPS DELIVER THE OUTPUT FLUID FLOW IN WHAT TWO FORMS? | AS A CONSTANT VOLUME OR A VARIABLE VOLUMN. |
| DESCRIBE THE OPERATION OF A GEAR-TYPE PUMP. | TWO MESHED GEARS, DRIVEN BY A POWER SOURCE, ROTATE IN A HOUSING. INLET FLUID IS CARRIED AROUND THE OUTSIDE OF THE GEARS AND DELIVERED TO THE OUTLET SIDE AS THE GEARS ROTATE. |
| DESCRIBE THE PURPOSE OF A PRESSURE REGULATOR. | PRESSURE REGULATORS MANAGE THE OUTPUT OF THE PUMP TO MAINTAIN SYSTEM PRESSURE. THEY ALLOW THE PUMP TO BE UNLOADED SO IT TURNS WITHOUT SIGNIFICANT RESISTANCE. |
| WHAT IS THE DEVICE THAT IS USED IN SOME SYSTEMS TO SUPPLEMENT THE PUMP OUTPUT DURING PERIODS OF HIGH DEMAND? | AN ACCUMULATOR. |
| WHAT ARE THE THREE DIFFERENT TYPES OF ACCUMULATORS? | PISTON, DIAPHRAM, AND BLADDER. |
| WHAT SAFETY PRECAUTIONS MUST BE TAKEN PRIOR TO DISASSEMBLING AN ACCUMULATOR? | RELEASE ALL THE AIR OR PRELOAD. |
| WHEN A HYDRAULIC UNIT IS REPLACED, WHAT PRECAUTIONS SHOULD BE TAKEN TO AVOID CONTAMINATION OF THE SYSTEM? | ALL LINES SHOULD BE CAPPED OR PLUGGED IMMEDIATELY AFTER THEY ARE DISCONNECTED. |
| WHAT TYPES OF COMPONENTS OR SYSTEMS ARE PNEUMATICALLY OPERATED IN SOME AIRCRAFT? | LANDING GEAR, BRAKES, FLAPS, AND OTHER MECHANICAL ACTUATORS. |
| NAME SEVERAL SOURCES OF PNEUMATIC POWER. | STORAGE BOTTLES, ENGINE BLEED AIR, ENGINE-DRIVEN COMPRESSORS OR VANE-TYPE PUMPS. |
| WHAT HAPPENS TO EXCESS PRESSURE IN A PNEUMATIC SYSTEM? | A RELIEF VALVE VENTS IT OVERBOARD. |
| WHAT IS THE FUNCTION OF A RESTRICTOR IN A PNEUMATIC SYSTEM? | TO CONTROL THE RATE OF FLOW OF THE AIRFLOW. |
| WHAT ARE THE REASONS FOR PERIODICALLY PURGING A PNEUMATIC SYSTEMS? | TO REMOVE MOISTURE AND CONTAMINANTS. |
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brookburns34924
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