Term
| WHAT ARE TWO BASIC TYPES OF HYDRAULIC FLUID THAT ARE USED IN MODERN AIRCRAFT? |
|
Definition
| MINERAL AND PHOSPHATE ESTER BASE FLUIDS. |
|
|
Term
| WHAT TYPE OF FILTER IS A MICRONIC FILTER? |
|
Definition
| A FILTER WITH A SPECIAL PAPER ELEMENT. |
|
|
Term
| DOES THE MAIN HYDRAULIC PUMP TAKE ITS FLUID FROM THE BOTTOM OF THE RESERVOIR OR FROM A STANDPIPE? |
|
Definition
MAIN PUMP TAKES IT FLUID FROM A STANDPIPE, THE EMERGENCY TAKES ITS FLUID FROM THE BOTTOM OF THE RESERVOIR.
|
|
|
Term
| WHY ARE SOME HYDRAULIC RESERVOIRS PRESSURIZED? |
|
Definition
| PRESSURIZATION ENSURES FLUID SUPPLY TO THE INLET OF THE PUMPS AT HIGH ALTITUDES. |
|
|
Term
| WHAT IS A DOUBLE ACTION PUMP? |
|
Definition
| A PUMP THAT DELIVERS FLUID WITH THE MOVEMENT OF THE PUMP HANDLE IN BOTH DIRECTIONS. |
|
|
Term
| WHY DO MOST ENGINE-DRIVEN HYDRAULIC PUMPS HAVE A SHEAR SECTION IN THEIR DRIVE COUPLINGS. |
|
Definition
| TO PREVENT FURTHER DAMAGE IF THE ENGINE SEIZES. |
|
|
Term
| WHAT DOES AN UNLOADING VALVE DO IN A HYDRAULIC SYSTEM? |
|
Definition
| CONTROLS SYSTEM PRESSURE BY SHIFTING THE PUMP OUTLET FLUID FROM THE PRESSURIZED SYSTEM BACK INTO THE RESERVOIR WHEN THE SYSTEM PRESSURE IS HIGH ENOUGH. |
|
|
Term
| WHAT IS THE PURPOSE OF AN ACCUMULATOR IN AN AIRCRAFT HYDRAULIC SYSTEM? |
|
Definition
| HOLDS PRESSURE ON THE HYDRAULIC FLUID SYSTEM. HOLDS PRESSURE BY COMPRESSED AIR OR NITROGEN ACTING ON THE FLUID THROUGH A BLADDER, A DIAPHRAM, OR A PISTON. |
|
|
Term
| WHAT IS THE PURPOSE OF AN ORFICE CHECK VALVE IN AN AIRCRAFT HYDRAULIC SYSTEM? |
|
Definition
| ALLOWS FULL FLUID FLOW IN ONE DIRECTION AND RESTRICTS THE FLOW IN THE OPPOSITE DIRECTION. |
|
|
Term
| WHERE ARE LINE DISCONNECT FITTINGS NORMALLY LOCATED IN AN AIRCRAFT HYDRAULIC SYSTEM? |
|
Definition
| IN THE LINES THAT CONNECT THE ENGINE-DRIVEN PUMP TO THE HYDRAULIC SYSTEM. |
|
|
Term
| WHAT IS MEANT BY A SINGLE ACTION HYDRAULIC ACTUATING CYLINDER? |
|
Definition
| A LINEAR ACTUATING CYLINDER THAT USES HYDRAULIC PRESSURE TO MOVE THE PISTON IN ONE DIRECTION, PISTON IS RETURNED BY A SPRING. |
|
|
Term
| WHAT IS THE SOURCE OF THE COMPRESSED AIR THAT IS USED IN A MEDIUM-PRESSURE PNEUMATIC SYSTEM ON A TURBINE-ENGINE POWERED AIRCRAFT? |
|
Definition
| BLEED AIR FROM ONE OF THE STAGES OF THE ENGINE COMPRESSOR. |
|
|
Term
| WHAT KIND OF DEVICE IS USED TO CONTROL OF MOVEMENT OF THE PISTON IN A PNEUMATIC ACTUATOR? |
|
Definition
|
|
Term
| WHY DO MOST HIGH-PRESSURE PNEUMATIC POWER SYSTEMS INCLUDE A MOISTURE SEPERATOR? |
|
Definition
| THE TEMPERATURE CAN DROP LOW ENOUGH TO FREEZE ANY WATER IN THE AIR, THIS REMOVES THIS WATER BEFORE AND CAN FREEZE AND BLOCK THE SYSTEM. |
|
|
Term
| WHAT IS THE DIFFERENCE BETWEEN AN OPEN-CENTER SELECTOR VALVE AND A CLOSED-CENTER SELECTOR VALVE? |
|
Definition
- OPEN-CENTER - INSTALLED IN SERIES WITH ONE ANOTHER, FLUID FLOWS THROUGH IT WHEN NO COMPONENT IS BEING ACTUATED.
- CLOSED-CENTER - INSTALLED PARALLEL WITH ONE ANOTHER, TRAPS FLUID IN THE LINES BETWEEN THE VALVE AND THE ACTUATOR.
|
|
|
Term
| WHAT IS USED TO FLUSH A HYDRAULIC SYSTEM THAT USES SKYDROL HYDRAULIC FLUID? |
|
Definition
|
|
Term
| WHAT IS USED TO FLUSH A HYDRAULIC SYSTEM THAT USES MINERAL BASE HYDRAULIC FLUID? |
|
Definition
| NAPHTHA, VARSOL, OR STODDARD SOLVENT. |
|
|
Term
| WHERE CAN YOU FIND THE TYPE OF HYDRAULIC FLUID THAT IS REQUIRED FOR A PARTICULAR AIRCRAFT? |
|
Definition
| MAINTENANCE MANUAL FOR THE AIRCRAFT OR PLACARD ON SYSTEM RESERVOIR. |
|
|
Term
| WHAT IS USED TO REMOVE PHOSPHATE ESTER BASE HYDRAULIC FLUID FROM AIRCRAFT TIRES? |
|
Definition
|
|
Term
| WHAT MUST BE DONE TO THE LINES THAT ARE DISCONNECTED WHEN SERVICING AN AIRCRAFT HYDRAULIC SYSTEM? |
|
Definition
| MUST BE CAPPED WITH PROPER CAP OR PLUG. |
|
|
Term
| WHAT ARE TWO WAYS AIRCRAFT HYDRAULIC RESERVOIRS MAY BE PRESSURIZED? |
|
Definition
| BY AN ASPIRATOR IN THE FLUID RETURN LINE OR BY BLEED AIR FROM ONE OF THE ENGINE COMPRESSORS. |
|
|
Term
| WHY DO SOME HYDRAULIC PRESSURE GAUGES HAVE A SNUBBER INSTALLED BETWEEN THEM AND THE HYDRAULIC PUMP? |
|
Definition
| KEEPS THE GAUGE FROM FLUCTUATING. |
|
|
