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POWERPLANT ORALS
CHAPTER 2 - RECIPROCATING ENGINE OPERATION, INSTRUMENTS, MAINTENANCE, OVERHAUL
| Question | Answer |
|---|---|
| WHAT INDICATIONS ARE GIVEN IN THE EVENT OF A LEAKING OR OPEN PRIMER WHILE THE ENGINE IS RUNNING? | THE ENGINE WILL NOT IDLE PROPERLY. |
| A COLD CYLINDER IS FOUND WHEN TROUBLESHOOTING A RUNNING ENGINE. WHAT DOES THIS INDICATE? | NO COMBUSTION IN THAT CYLINDER. |
| WHEN PULLING A PROPELLER THROUGH, A HISSING SOUND IS HEARD, INDICATING VALVE BLOW-BY. WHAT PROCEDURE SHOULD BE PERFORMED NEXT? | A COMPRESSION CHECK SHOULD BE PERFORMED TO IDENTIFY THE FAULTY CYLINDER. |
| WHAT IS THE PURPOSE OF PERFORMING A COMPRESSION TEST? | TO DETERMINE IF THE VALVES, PISTONS AND RINGS ARE SEALING PROPERLY. |
| WHEN AN ENGINE IS OVERHAULED, HOW IS ITS TOTAL TIME AFFECTED? WHEN AN ENGINE REBUILD, HOW IS ITS OPERATING HISTORY AFFECTED? | THE TOTAL TIME ON THE ENGINE MUST BE CONTINUED AND THE TIME SINCE MAJOR OVERHAUL IS ENTERED INTO THE ENGINE LOG. IF THE MANUFACTURER REBUILDS THE ENGINE, IT IS GRANTED A ZERO-TIME STATUS AND IS CONSIDERED TO HAVE NO PREVIOUS OPERATING HISTORY. |
| WHAT INSPECTIONS SHOULD BE PERFORMED AFTER A PROPELLER STRIKE WITHOUT SUDDEN STOPPAGE? | 1. INSPECT ENGINE MOUNTS, THE CRANKCASE, AND THE NOSE SECTION FOR DAMAGE. 2. INSPECT THE OIL AND OIL FILTERS/SCREENS FOR METAL PARTICLES. 3. INSPECT THE CRANKSHAFT OR DRIVESHAFT FOR CRACKS AND MISALIGNMENT. |
| NAME SOME OF THE PRECAUTIONS THAT SHOULD BE PERFORMED PRIOR TO ENGINE REMOVAL. | DISCONNECT THE BATTERY, TURN OFF THE FUEL VALVES, CHOCK THE WHEELS, AND IF NECESSARY, INSTALL A TAIL STAND. |
| WHEN INSPECTING A PISTON, WHERE ARE CRACKS MOST LIKELY TO BE FOUND? | IN THOSE AREAS THAT ARE HIGHLY STRESSED; USUALLY THE BASE OF THE PISTON BOSSES, INSIDE AT THE JUNCTION OF THE BORE AND THE WALLS, AND THE RING LANDS. |
| WHAT DOES IT MEAN IF AN ENGINE PART IS WITHIN "SERVICEABLE LIMITS"? | IT MEANS THAT THE PART IS WITHIN THE MANUFACTURER'S LIMITS AND CAN BE USED IN AN ENGINE. (DOES NOT REQUIRE REPLACEMENT.) |
| WHAT TOOLS OR INSTRUMENTS ARE USED TO INSPECT A CYLINDER BARREL FOR OUT-OF-ROUNDNESS? | A DIAL INDICATOR OR AN INSIDE MICROMETER IS USUALLY USED TO MEASURE THE TOP OF THE CYLINDER AND AT THE SKIRT. A TELESCOPIC GAUGE AND MICROMETER CAN ALSO BE USED. TWO READINGS SHOULD BE TAKEN 90# TO EACH OTHER. |
| HOW CAN A LOOSE STUD IN AN ENGINE CRANKCASE BE REPAIRED? | REMOVE THE LOOSE STUD AND INSPECT THE HOLE FOR SIZE AND THREAD CONDITION. IT MAY BE NECESSARY TO USE AN OVERSIZE STUD OR HELI-COIL INSERT. |
| WHAT PUBLICATION IS USED TO CHECK AN ENGINE FOR NORMAL OPERATION? | MANUFACTURER'S MAINTENANCE MANUAL. |
| A WEAK CYLINDER IS FOUND DURING A COMPRESSION CHECK. WHAT MUST BE INSPECTED? | IDENTIFY WHERE THE LEAK IS. CHECK INTAKE AND EXHAUST VALVES, PISTON RINGS, OR POTENTIALLY A CRACKED CYLINDER. |
| WHAT PURPOSE DOES AN OIL ANALYSIS SERVE? | METAL PARTICLES IN THE OIL SHOW NORMAL AND ABNORMAL WEAR OF THE ENGINE. THIS HELPS IN EVALUATING THE ENGINE'S INTERNAL CONDITION. |
| WHAT INSPECTION SHOULD BE PERFORMED ON AN ENGINE THAT HAS BEEN IN STORAGE? | PERFORM AN INSPECTION TO DETERMINE IF THERE IS ANY CORROSION DAMAGE. |
| WHERE WOULD A CARBURETOR AIR TEMP BULB BE LOCATED? | IN THE RAM AIR INTAKE DUCT. |
| WHAT IS THE FUEL PRESSURE RANGE ON FLOAT-TYPE CARBURETORS? | 3 TO 5 PSI. |
| NAME THE BASIC COMPONENTS OF A FUEL INDICATOR SYSTEM. | THE TRANSMITTER AND THE INDICATOR. |
| WHAT UNIT OF MEASURE IS GENERALLY USED TO INDICATE FUEL FLOW? | POUNDS OR GALLONS PER HOUR. |
| WHY IS FUEL FLOW MONITER? | TO DETERMINE FUEL CONSUMPTON AND ENGINE PERFORMANCE. |
| WHAT DOES THE MANIFOLD GAUGE INDICATE AND HOW IS IT CALIBRATED? | IT MEASURES THE ABSOLUTE PRESSURE IN THE ENGINE MANIFOLD AND IS CALIBRATED IN INCHES OF MERCURY. |
| WHAT DIRECTLY CONTROLS MANIFOLD PRESSURE? | THROTTLE OPENING AND ENGINE RPM. |
| DURING ENGINE OPERATION, WHERE SHOULD THE PROPELLER CONTROL BE SET WHEN CHECKING THE MANIFOLD PRESSURE? | LOW PITCH, HIGH RPM. |
| IS THE AIRCRAFT ELECTRICAL SYSTEM REQUIRED TO POWER A CYLINDER HEAD TEMPERATURE GAUAGE? | NO, A THERMOCOUPLE IS USED AS THE ELECTRICAL SOURCE. |
| WHAT ARE THE POSSIBLE INDICATIONS OF AN OIL PRESSURE TRANSMITTER OR INDICATOR MALFUNCTION? | A SEVERE OR SUDDEN DROP IN OIL PRESSURE WHILE THE OIL TEMP REMAINS NORMAL AND THE OIL SUPPLY REMAINS FULL. |
| WHAT DOES A TACHOMETER INDICATE ON A RECIPROCATING ENGINE? | ENGINE RPM. |
| WHERE SHOULD THE THERMOCOUPLE BE INSTALLED ON A RECIPROCATING ENGINE USING A SINGLE PROBE CYLINDER HEAD TEMP SYSTEM? | ON THE HOTTEST CYLINDER. |
Created by:
brookburns34924
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