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AIRFRAME ORALS
CHAPTER 5 - AIRCRAFT FABRIC COVERING
Question | Answer |
---|---|
AIRCRAFT COVERING FABRICS ARE MADE OF MATERIALS FROM WHAT TWO SOURCES? | ORGANIC MATERIALS AND SYNTHETIC MATERIALS. |
HOW WOULD YOU DETERMINE THE STRENGTH REQUIREMENTS FOR FABRIC USED TO RE-COVER AN AIRCRAFT? | THE FABRIC MUST BE OF AT LEAST THE QUALITY AND STRENGTH OF THE FABRIC USED BY THE ORIGINAL MANUFACTURER. |
WHAT TWO TYPES OF ORGANIC FIBERS ARE USED FOR COVERING AIRCRAFT? | COTTON AND LINEN. |
WHAT IS MEANT BY WARP, WEFT, AND BIAS? | WARP IS THE DIRECTION ALONG THE LENGTH OF THE FABRIC, WEFT IS THE DIRECTION ACROSS THE FABRIC AT RIGHT ANGLES TO THE WARP, AND BIAS IS A DIRECTION AT A 45 DEGREE ANGLE TO THE WARP AND WEFT. |
WHAT IS THE PURPOSE OF THE SELVAGE EDGE ON A ROLL OF FABRIC? | IT PREVENTS THE FABRIC FROM UNRAVELING. |
WHAT IDENTIFICATION MARKING IS FOUND ON THE SELVAGE EDGE, AND IN WHICH DIRECTION IS THE WARP APPLIED? | THE FAA-PMA STAMP IS FOUND ON THE SELVAGE EDGE AND THE WARP IS APPLIED PARALLEL TO THE LINE OF FLIGHT. |
HOW ARE THE FABRIC TYPE AND STRENGTH REQUIREMENTS DETERMINED FOR FABRIC-COVERED AIRCRAFT? | THE ORIGINAL MANUFACTURER DETERMINES THE FABRIC TYPE, AND THE STRENGTH REQUIREMENTS ARE A FUNCTION OF THE NEVER-EXCEED SPEED AND WING LOADING. |
WHAT TYPES OF SYNTHETIC FIBERS ARE USED FOR COVERING AIRCRAFT? | FIBERGLASS, AND HEAT-SHRINKABLE POLYESTER FIBERS. |
WHICH OF THE SVERAL TYPES OF FABRIC IS UNAFFECTED BY MOISTURE AND MILDEW? | FIBERGLASS. |
WHAT IS THE FUNCTION OR PURPOSE OF REINFORCING TAPE? | REINFORCING TAPE IS USED BETWEEN THE FABRIC AND THE RIB STITCHING TO PREVENT THE LACING CORD FROM CUTTING THROUGH THE FABRIC. |
WHERE WOULD YOU USE SURFACE TAPE? | OVER RIB STITCHING AND SEWED SEAMS, OVER LAPPED EDGES, AROUND CORNERS, AND ALONG LEADING AND TRAILING EDGES. |
HOW SHOULD THE EDGES OF DRAINAGE, INSPECTION, AND VENTILATION HOLES BE REINFORCED? | WITH PLASTIC, ALUMINIUM, OR BRASS GROMMETS. |
WHAT ARE THE PRINCIPLE METHODS USED TO TEST THE CONDITION OF FABRIC? | PUNCH TESTERS SUCH AS THE MAULE OR SEYBOLT TESTER, AND LABORATORY PULL-TESTING. |
FABRIC IS CONSIDERED UN-AIRWORTHY WHEN IT HAS DETERIORATED TO WHAT PERCENTAGE OF ITS ORIGINAL STRENGH? | LESS THAN 70%. |
HOW SHOULD A STRUCTURE THAT WILL BE COVERED WITH DOPED FABRIC BE PREPARED FOLLOWING INSPECTION AND PRIOR TO COVERING? | TREAT IT WITH A PROTECTIVE COATING OF PAINT OR VARNISH AS APPROPRIATE. |
WHAT IS THE PRINCIPAL ADVANTAGE OF THE ENVELOPE METHOD FOR COVERING WINGS? | ALMOST ALL THE SEAMS ARE MACHINE-SEWED BY THE ENVELOPE SUPPLIER. |
WHAT IS A TIE-OFF KNOT? | A STANDARD, MODIFIED SEINE KNOT UED ON ALL STITCHES EXCEPT THE STARTING STITCH . |
NAME THREE COMMON TYPES OF MACHINE-SEWED SEAMS. | PLAIN OVERLAP, FOLDED-FELL, AND FRENCH-FELL. |
WHERE ARE ANTI-TEAR STRIPS USED? | UNDER WING RIB STITCHING WHEN THE NEVER-EXCEED SPEED IS GREATER THAN 250 MPH. |
HOW WOULD YOU DETERMINE THE CORRECT SPACING FOR RIB STITCHING IF THE ORIGINAL SPACING WAS UNKNOWN? | CONSULT THE CHART IN AC 43.13-1B. |