EASA Module 7 flashcards
EASA Module 7 · Build recall with a focused review session.
33 cards. Read the term and the definition here. The deck at the top of this page is optional.
- FOD
- Foreign Object Debris - any loose item that can damage aircraft or injure personnel; prevention requires tool control and inspection of intakes, controls and work areas.
- Bonding during fuelling
- Connecting aircraft, fuel source and earth with bonding leads before fuelling so that static electricity discharges safely instead of producing a spark.
- Fire class D
- Fire involving combustible metals such as magnesium or titanium; it requires a special dry powder extinguisher, because water or carbon dioxide can make it worse.
- Torque wrench calibration
- Torque wrenches must be calibrated at intervals stated in the maintenance organisation's procedures, typically every 12 months and after overload or drop.
- Lockwire direction
- Safety wire is installed so tension pulls the fastener clockwise, in the tightening direction; twisting the wire the wrong way can loosen the fastener.
- Helicoil insert
- A coiled stainless-steel insert fitted into a drilled and tapped oversize hole to restore a damaged internal thread to its original nominal size.
- Micrometer reading
- Read the barrel main scale in millimetres, then add the thimble reading multiplied by 0.01 mm; verify the zero setting before measuring.
- Torque formula
- Torque equals force multiplied by the perpendicular distance from the pivot (T = F × d), expressed in newton metres or pound-feet.
- Calibration traceability
- A chain of comparisons linking an instrument's calibration to a national or international standard, recorded on a certificate with an expiry date.
- Third-angle projection
- A drawing convention in which each view is placed on the side of the object from which it is viewed; common on US and some Asian drawings.
- ATA 100 chapters
- A standard numbering system grouping aircraft systems into chapters, such as 27 for flight controls and 32 for landing gear, used in manuals.
- Drawing title block
- The area of a drawing giving drawing number, part number, scale, revision, sheet number and approvals; work must follow the latest revision.
- Clearance fit
- A fit in which the largest permissible shaft is smaller than the smallest permissible hole, so a gap always exists between the assembled parts.
- Interference fit
- A fit in which the smallest permissible shaft is larger than the largest permissible hole, requiring force or a temperature change to assemble.
- Allowance
- The intentional difference between the nominal sizes of mating parts; minimum clearance in a clearance fit, or maximum interference in an interference fit.
- AWG wire size
- American Wire Gauge number indicating conductor cross-section; a smaller number means a thicker wire with greater current-carrying capacity.
- Bonding resistance
- The electrical resistance between bonded aircraft structure and equipment, typically required to be 2.5 milliohms or less for primary structure.
- Megohmmeter test
- An insulation resistance test applying a specified DC voltage to a circuit to detect moisture, contamination or damaged insulation; low readings indicate a fault.
- EWIS separation
- Routing power and signal wires apart to prevent electromagnetic interference; where separation cannot be kept, wires cross at right angles.
- Rivet edge distance
- The distance from the centre of a rivet hole to the edge of the sheet, normally at least two rivet diameters to prevent tear-out.
- AN flare angle
- Standard aviation hydraulic flare fittings use a 37-degree flare; SAE 45-degree fittings are not interchangeable with them and must not be mixed.
- Turnbuckle safety
- A turnbuckle adjusting control cable tension must be secured with lockwire or a locking clip after adjustment to prevent rotation in service.
- Bearing preload
- An axial or radial load applied during assembly to remove internal clearance; excessive preload causes overheating and premature bearing failure.
- Spring rate
- The force required to compress or extend a spring by unit length, expressed in newtons per millimetre and used to check springs against specification.
- Brazing temperature
- Brazing uses a filler metal that melts above 450 degrees Celsius but below the melting point of the parent metal, unlike soldering.
- Hydrogen embrittlement
- A condition in which hydrogen absorbed during plating, welding or pickling makes high-strength steel brittle; baking after processing reduces the risk.
- Welding symbol
- A drawing symbol showing weld type, size, length, spacing and finish, placed on a reference line with an arrow pointing to the joint.
- CG formula
- Centre of gravity equals total moment divided by total weight, where each moment is the item weight multiplied by its arm from the datum.
- Weight shift formula
- Moving a weight changes the centre of gravity by the amount (weight moved × distance moved) divided by the total aircraft weight.
- Datum
- A fixed reference point or plane on the aircraft from which all weight and balance arms are measured; arms forward of it are negative.
- Dye penetrant inspection
- A non-destructive test for surface-breaking defects: penetrant enters cracks, is cleaned from the surface, then drawn out by developer and inspected.
- Torque sequence
- The order in which fasteners are tightened, usually crisscross or from the centre outward in stages, to distribute clamping load evenly.
- Rigging check
- Verifying that control surface travel, cable tension and clearances match the maintenance manual throughout the full range of movement.