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GENERAL ORALS
CHAPTER 10 - FLUID LINES AND FITTINGS
| Question | Answer |
|---|---|
| WHAT ARE TWO TYPES OF FLUID LINES COMMONLY FOUND IN AIRCRAFT? | RIGID METAL LINES AND FLEXIBLE HOSES. |
| DESCRIBE THE METHOD OF CLASSIFYING METAL TUBE ACCORDING TO SIZE. | METAL TUBING IS SIZED ACCORDING TO WALL THICKNESS AND OUTSIDE DIAMETER IS MEASURED IN 1/16TH INCH INCREMENTS. |
| WHEN INSTALLING STAINLESS STEEL TUBING, WHAT TYPE OF FITTINGS SHOULD BE USED? | STAINLESS STEEL FITTINGS. |
| WHAT IS THE FUNCTION OF THE SLEEVE ON A FLARED-TUBE FITTING? | THE NUT FITS OVER THE SLEEVE AND DRAWS THE SLEEVE AND THE TUBING FLARE TIGHTLY AGAINST THE MALE FITTING TO FORM THE SEAL. |
| DESCRIBE THE TWO TYPES OF FLARES COMMONLY USED ON AIRCRAFT TUBING. | THE SINGLE FLARE AND THE DOUBLE FLARE. |
| HOW CAN YOU DETERMINE IF A FITTING IS AN "AN" TYPE RATHER THAN AN "AC" TYPE? | "AN" FITTINGS HAVE A SHOULDER BETWEEN THE FLARE CONE AND THE END OF THE THREADS, "AC" FITTINGS DO NOT. |
| WHAT ARE THE MOST SIGNIFICANT DIFFERENCES BETWEEN "AN" AND "AC" FITTINGS? | SLEEVE LENGTH, THREAD PITCH, AND THE SHOULDER BETWEEN THE THREADS AND THE FLARE CONE ON "AN" FITTINGS. |
| WHAT ARE THE NAMES OF THE PARTS OF A FLARELESS TUBE FITTING? | THE NUT AND THE FERRULE OR SLEEVE. |
| HOW DO YOU TELL A FLARELESS FITTING FROM A FLARE-TYPE FITTING? | FLARELESS FITTINGS DON'T HAVE A FLARE CONE AND THERE IS NO SPACE BETWEEN THE THREADS AND THE END OF THE FITTING. |
| WHAT IS THE EFFECT OF OVER-TIGHTENING A FLARE TYPE FITTING? | THE SEALING SURFACE MAY BE DAMAGED OR THE FLARE CUT OFF. |
| IN ADDITION TO BEING SECURELY CLAMPED, WHAT IS AN ADDITIONAL REQUIREMENT FOR INSTALLING METAL FUEL, OIL AND HYDRAULIC LINES? | THE LINES MUST BE ELECTRICALLY BONDED TO THE STRUCTURE. |
| WHAT ARE SOME OF THE IMPORTANT ADVANTAGES OF TEFLON TUBING? | IT IS COMPATIBLE WITH NEARLY EVERY LIQUID, HAS A BROAD OPERATING TEMPERATURE RANGE, LOW RESISTANCE TO FLUID FLOW AND HAS A VERY LONG SHELF AND SERVICE LIFE. |
| DESCRIBE THE IDENTIFICATION MARKINGS COMMONLY FOUND ON FLEXIBLE HOSES. | A LAY LINE, IDENTIFICATION SUCH AS A MIL SPEC NUMBER, THE MANUFACTURER'S NAME OR SYMBOL, THE HOSE SIZE AND A DATE CODE. |
| HOW CAN YOU DETERMINE IF A FLEXIBLE HOSE HAS BEEN CORRECTLY OR INCORRECTLY INSTALLED? | THE LAY LINE WILL BE STRAIGHT IF THE HOSE IS PROPERLY INSTALLED. A TWISTED LAY LINE INDICATES AN INCORRECT INSTALLATION. |
| HOW ARE FLEXIBLE HOSE SIZES DESIGNATED? | BY THE INSIDE DIAMETER, MEASURED IN 1/16TH INCH INCREMENTS |
| WHAT PRECAUTIONS MUST BE OBSERVED WHEN DEBURRING THE END OF A TUBE AFTER IT IS CUT? | THE WALL THICKNESS MUST NOT BE REDUCED IN SIZE OR FRACTURED. |
| DESCRIBE THE OPERATION OF QUICK DISCONNECT COUPLINGS. | EACH HALF HAS A VALVE THAT IS HELD OPEN WHEN COUPLED AND IS SPRING-LOADED CLOSED WHEN DISCONNECTED. |
| IF YOU FABRICATE A REPLACEMENT FOR A FLEXIBLE HOSE, WHAT PERCENTAGE OF THE TOTAL LENGTH MUST BE ADDED TO ALLOW FOR MOVEMENT UNDER PRESSURE. | FIVE (5) TO EIGHT (8) PERCENT |
| WHAT HAPPENS TO THE TUBE WHEN A FLARELESS FITTING IS OVERTIGHTEND? | THE TUBE IS WEAKENED WHEN THE NUT DRIVES THE CUTTING EDGE OF THE SLEEVE TOO DEEPLY INTO THE TUBE. |
| WHY ARE QUICK DISCONNECT FITTINGS USED? | TO PROVIDE A QUICK MEANS TO CONNECT OR DISCONNECT A FLUID LINE WITHOUT LOSS OF FLUID OR ENTRANCE OF AIR INTO THE SYSTEM. |
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brookburns34924
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