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AIRFRAME ORALS

CHAPTER 15 - AIRCRAFT FUEL SYSTEMS

QuestionAnswer
WHY DO SOME AIRCRAFT HAVE FUEL JETTISON SYSTEMS? TO ALLOW THE CREW TO REDUCE THE WEIGHT OF THE AIRCRAFT DOWN TO OR BELOW THE MAXIMUM ALLOWABLE LANDING WEIGHT.
IS THERE ANY REASON WHY A FUEL JETTISON SYSTEM MIGHT BE REQUIRED ON A SMALL AIRCRAFT? YES, IF THE MAXIMUM TAKEOFF WEIGHT EXCEEDS THE MAXIMUM ALLOWABLE LANDING WEIGHT, A JETTISON SYSTEM WOULD BE REQUIRED.
WHAT ARE SOME OTHER NAMES FOR A SINGLE-POINT FUELING SYSTEM? AN UNDERWING OR PRESSURE FUELING SYSTEM.
WHY DO MULTI-ENGINE AIRPLANES HAVE FUEL CROSSFEED SYSTEMS? TO ALLOW ANY ENGINE TO TO DRAW FUEL FROM ANY TANK.
THE FUEL SELCTOR VALVE FOR A MULTI-ENGINE AIRCRAFT MUST HAVE AT LEAST THREE POSITIONS. WHAT ARE THEY? ON, OFF, AND CROSSFEED.
WHY DO SOME FUEL TANKS HAVE INTERNAL BAFFLES? TO RESIST FUEL SURGING OR SLOSHING CAUSED BY CHANGES IN THE ATTITUDE OF THE AIRCRAFT.
WHAT ARE THE TWO TYPES OF FUEL CELLS? INTEGRAL OR WET WING FUEL CELLS, AND BLADDER-TYPE FUEL CELLS.
WHAT DOES THE TERM "WET-WING" MEAN? IT MEANS THE SEALED PORTIONS OF THE AIRCRAFT WING STRUCTURE FORM THE FUEL TANK(S).
HOW IS THE WEIGHT OF THE FUEL SUPPORTED WHEN BLADDER-TYPE FUEL CELLS ? THE BLADDER IS SUPPORTED BY THE AIRCRAFT STRUCTURE WHICH CONTAINS IT.
WHY DO TURBINE -ENGINE AIRCRAFT HAVE FUEL TEMPERATURE INDICATING SYSTEMS? TO ALLOW THE CREW TO DETERMINE IF THE FUEL IS COLD ENOUGH TO PRODUCE A DANGER OF THE FORMATION OF ICE CRYSTALS.
NAME FOUR TYPES OF FUEL QUANTITY GAUGING SYSTEMS CURRENTLY IN USE. SIGHT GAUGES, MECHANICAL, ELECTRIC, AND ELECTRONIC GAUGES.
WHY ARE ELECTRONIC (CAPACITANCE-TYPE) FUEL QUANTITY INDICATING SYSTEMS MORE ACCURATE THAN OTHER TYPES? THEY MEASURE THE MASS OF THE FUEL INSTEAD OF THE VOLUME.
WHAT ARE DRIP GAUGES AND SIGHT GAUGES? UNDERWING, BAYONET-TYPE FUEL GAUGES.
WHAT IS THE PURPOSE OF AN IN-TRANSIT LIGHT ASSOCIATED WITH AN ELECTRICALLY OPERATED FUEL TANK SHUTOFF VALVE? TO PROVIDE AN INDICATION THAT THE VALVE IS IN MOTION BETWEEN ONE POSITION AND ANOTHER.
FOR WHAT REASON IS A FUEL JETTISON SYSTEM USUALLY DIVIDED INTO TWO SEPARATE, INDEPENDENT SYSTEMS, ONE FOR EACH WING? TO HELP MAINTAIN LATERAL STABILITY BY JETTISONING FUEL FROM A HEAVY WING IF NECESSARY.
WHAT PROCEDURES SHOULD BE FOLLOWED REGARDING GASKETS AND SEALS WHEN REPLACING FUEL SYSTEM COMPONENTS? ALL OLD GASKETS AND SEALS SHOULD BE REPLACED WITH NEW ONES.
IS IT POSSIBLE FOR A FUEL SYSTEM TO DEVELOP A LEAK THAT HAS NO VISIBLE EVIDENCE SUCH AS A STAIN OR SPOT, AND IF SO, HOW? AN INTERNAL COMPONENT SUCH AS A VALVE COULD DEVELOP A LEAK.
HOW IS A FUEL TANK CHECKED FOR LEAKS FOLLOWING A PATCH OR WELDED REPAIR? THE TANK IS SLIGHTLY PRESSURIZED WITH AIR AND THE REPAIRED AREA IS LEAK-CHECKED WITH A SOAP AND WATER SOLUTION.
NAME SOME ADVANTAGES OF A SINGLE-POINT FUELING SYSTEM. IT REDUCES FUELING TIME, REDUCES CHANCES FOR CONTAMINATION AND FIRE, AND ELIMINATES DAMAGE TO THE AIRCRAFT SKIN.
WHY SHOULD YOU WAIT FOR A PERIOD OF TIME AFTER FUELING AN AIRCRAFT BEFORE CHECKING THE FUEL SUMPS? TO ALLOW TIME FOR WATER AND CONTAMINANTS TO SETTLE TO THE DRAIN POINT.
Created by: brookburns34924
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