BTS Aéronautique flashcards

32 cards. Read the term and the definition here. The deck at the top of this page is optional.

Thèse d'un texte argumentatif

Idée principale que l'auteur défend dans un texte argumentatif. Elle est soutenue par des arguments, eux-mêmes illustrés par des exemples concrets.

Connecteur logique de conséquence

Mot ou expression qui introduit un effet tiré de ce qui précède : donc, par conséquent, c'est pourquoi. Il structure le raisonnement et rend la démonstration lisible.

Registre de langue

Niveau de langue utilisé dans un texte : soutenu, courant ou familier. Il se repère au lexique, à la syntaxe et aux marques de modalisation employées.

Synthèse de documents

Reformulation organisée de plusieurs documents avec ses propres mots, cités entre guillemets. Elle confronte les idées au lieu de les juxtaposer.

Accord du participe passé avec avoir

Avec l'auxiliaire avoir, le participe passé s'accorde en genre et en nombre avec le complément d'objet direct placé avant le verbe.

AOG in aviation English

Aircraft On Ground: an aircraft grounded by a defect requiring immediate action. It has priority over normal maintenance and often needs expedited parts delivery.

Passive voice in technical English

Form be + past participle used to focus on the action or object rather than the agent. Example: The panel is inspected every 500 flight hours.

Modal verbs of obligation

Must expresses strong obligation, should a recommendation, may or might a possibility, and can a capability or authorisation. They are followed by the base verb.

Reading a flight level

A flight level is read digit by digit, so FL350 is flight level three five zero. Altitudes in feet are read as numbers, for example twelve thousand feet.

SOH-CAH-TOA

Mnemonic for right-triangle ratios: sine equals opposite over hypotenuse, cosine equals adjacent over hypotenuse, tangent equals opposite over adjacent.

Pythagorean theorem

In a right triangle, the square of the hypotenuse equals the sum of the squares of the other two sides: a squared plus b squared equals c squared.

Logarithm product rule

The logarithm of a product equals the sum of the logarithms: ln(a times b) equals ln a plus ln b. The rule also gives ln(a to the n) equals n ln a.

Standard deviation definition

Square root of the variance, which is the mean of the squared deviations from the mean. It measures the spread of a data series in its own unit.

Unit conversion in aviation

Useful conversions: one inch equals 25.4 millimetres, one knot equals 1.852 kilometres per hour, one bar equals 100 000 pascals, one kgf is about 9.81 newtons.

Hydrostatic pressure formula

Pressure in a fluid at rest equals density times gravity times depth: p equals rho times g times h, with density in kilograms per cubic metre and depth in metres.

Ideal gas law

Pressure times volume equals amount of substance times the gas constant times absolute temperature: pV equals nRT, with R equal to 8.314 joules per mole kelvin.

Lift formula

Lift equals one half times air density times velocity squared times wing area times lift coefficient. Doubling speed quadruples lift if the coefficient stays constant.

Corrosion protection methods

Metals are protected by paint coatings, anodising of aluminium, and sacrificial anodes called cathodic protection. Dissimilar metals in contact accelerate galvanic corrosion.

Tightening torque formula

Torque equals force multiplied by lever arm: C equals F times r, expressed in newton metres. A calibrated torque wrench controls the tightening moment applied to a fastener.

Gear ratio

Ratio equals number of teeth on the driven gear divided by number of teeth on the driver gear. Output speed equals input speed divided by the ratio.

Normal stress formula

Normal stress sigma equals force divided by cross-sectional area, expressed in megapascals. In the elastic domain, Hooke's law gives sigma equals Young's modulus times strain.

ISO clearance fit

A fit such as H7/g6 defines the tolerance classes of hole and shaft. The letter case and number determine whether the assembly has clearance or interference.

Voltage divider rule

For two resistors in series, output voltage equals input voltage times R2 divided by the sum of R1 and R2. It is used to obtain a reduced reference voltage.

Three-phase power formula

Active power equals square root of three times line voltage times line current times power factor. The factor cos phi accounts for the phase shift between voltage and current.

Logic gate NAND

A NAND gate outputs zero only when all its inputs are one; otherwise it outputs one. It is called a universal gate because any logic function can be built from it.

Current loop signal 4-20 mA

Industrial standard where a measured value is transmitted as a current between 4 and 20 milliamperes. Four milliamperes represents the zero of the scale, 20 the maximum.

ATA 100 chapter system

Standard numbering of aircraft systems: ATA 21 air conditioning, ATA 24 electrical power, ATA 27 flight controls, ATA 32 landing gear, ATA 71 power plant.

Minimum Equipment List

Document that lists equipment allowed to be inoperative for dispatch, with the conditions and deferral period. Any use of it must be recorded in the technical logbook.

Certificate of Release to Service

Document signed by authorised maintenance staff confirming that the aircraft or component is airworthy and fit for return to service after the work performed.

PDCA improvement cycle

Four-step cycle: Plan objectives, Do the implementation, Check measured results, Act to standardise or correct. It underpins continuous improvement in quality management.

Pareto principle in quality

Roughly 80 percent of effects come from 20 percent of causes. A Pareto chart ranks causes by frequency so effort is focused on the few that matter most.

Risk assessment in safety

Risk level is estimated from the severity of harm multiplied by the probability of occurrence. Controls are applied in order: eliminate, substitute, engineer, administrate, then use protective equipment.