During deceleration following a landing in a westerly direction a magnetic compass made for the southern hemisphere indicates ?
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Source: Telepilote theorique examen 45
During deceleration following a landing in an easterly direction a magnetic compass made for the northern hemisphere indicates ?
During deceleration following a landing in an easterly direction a magnetic compass made for the southern hemisphere indicates ?
About a magnetic compass Turning error due to vertical component of earth's magnetic field. acceleration/deceleration errors are false compass indications of a swing to north or south during speed changes of airplane this error most pronounced when flying on a heading of east or west decreases when flying closer to a north or south heading in a direct north or south heading this error does not occur in northern hemisphere compass swings towards north during acceleration towards south during deceleration in southern hemisphere this error occurs other way round when speed stabilises error disappears learn this for northern hemisphere ands ! a cceleration gives apparent turn to n orth d eceleration gives apparent turn to s outh. 
A pilot wishes to turn right on to a southerly heading with 20° bank at a latitude of 20° north using a direct reading compass in order to achieve this he must stop turn on an approximate heading of Turning error due to vertical component of earth's magnetic field. in northern hemisphere as you turn through north you must roll out early onto your required heading if you turn through south you roll out late use unos to remember this un = undershoot north os = overshoot south the value you need to overshoot or undershoot does vary with latitude (due to compass dip bank angle due to acceleration) to calculate value use this approximation formula heading = 180° + (bank angle + latitude)/2 heading = 180 + (20 + 20) / 2 heading = 180° + 20° = 200°. 
The turning errors of a direct reading magnetic compass are Maximum at magnetic poles. at magnetic equator attraction of compass needle towards north south poles equal the needle remains unbiased as compass moved either north or south of magnetic equator attraction to nearest pole increased thus needle will be biased towards nearest pole this phenomenon called magnetic dip this compass error amplified with proximity to either pole. 
A flux valve detects horizontal component of earth's magnetic field 1 flux valve made of a pair of soft iron bars2 information can be used a 'flux gate' compass or a directional gyro3 flux gate valve casing dependent on aircraft three inertial axis4 accuracy on value of magnetic field indication less than 0 5°the combination regrouping all correct statements Maximum at magnetic poles. the magnetic detector unit (flux valve) fixed to aircraft it feeds error detector with information about earth's magnetic field it made of three soft iron bars this system very accurate (accuracy on value of magnetic field indication less than 0 5°). Question 45-8
The direct reading magnetic compass no more reliable when approaching 1 magnetic poles 2 magnetic equator with a east or west heading 3 magnetic equator with a north or south heading the combination that regroups all of correct statements Maximum at magnetic poles. the magnetic detector unit (flux valve) fixed to aircraft it feeds error detector with information about earth's magnetic field it made of three soft iron bars this system very accurate (accuracy on value of magnetic field indication less than 0 5°). Question 45-9
In northern hemisphere during a take off r in a westerly direction a direct reading magnetic compass indicates An apparent turn to north. Acceleration/deceleration errors are false compass indications of a swing to north or south during speed changes of airplane this error most pronounced when flying on a heading of east or west decreases when flying closer to a north or south heading in a direct north or south heading this error does not occur in northern hemisphere compass swings towards north during acceleration towards south during deceleration in southern hemisphere this error occurs other way round when speed stabilises error disappears learn this for northern hemisphere ands ! a cceleration gives apparent turn to n orth d eceleration gives apparent turn to s outh. Question 45-10
In northern hemisphere during take off r in an easterly direction a direct reading magnetic compass indicates An apparent turn to north. Acceleration/deceleration errors are false compass indications of a swing to north or south during speed changes of airplane this error most pronounced when flying on a heading of east or west decreases when flying closer to a north or south heading in a direct north or south heading this error does not occur in northern hemisphere compass swings towards north during acceleration towards south during deceleration in southern hemisphere this error occurs other way round when speed stabilises error disappears learn this for northern hemisphere ands ! a cceleration gives apparent turn to n orth d eceleration gives apparent turn to s outh. Question 45-11
Which of following statements about hard and soft iron in relation to magnetism correct Hard iron magnetism of a permanent nature soft iron of a non permanent nature. Acceleration/deceleration errors are false compass indications of a swing to north or south during speed changes of airplane this error most pronounced when flying on a heading of east or west decreases when flying closer to a north or south heading in a direct north or south heading this error does not occur in northern hemisphere compass swings towards north during acceleration towards south during deceleration in southern hemisphere this error occurs other way round when speed stabilises error disappears learn this for northern hemisphere ands ! a cceleration gives apparent turn to n orth d eceleration gives apparent turn to s outh. Question 45-12
The turning error of a direct reading magnetic compass Increases when magnetic latitude increases. Acceleration/deceleration errors are false compass indications of a swing to north or south during speed changes of airplane this error most pronounced when flying on a heading of east or west decreases when flying closer to a north or south heading in a direct north or south heading this error does not occur in northern hemisphere compass swings towards north during acceleration towards south during deceleration in southern hemisphere this error occurs other way round when speed stabilises error disappears learn this for northern hemisphere ands ! a cceleration gives apparent turn to n orth d eceleration gives apparent turn to s outh. Question 45-13
Direct reading magnetic compass errors are Due to north change depending on bank angle magnetic heading. Acceleration/deceleration errors are false compass indications of a swing to north or south during speed changes of airplane this error most pronounced when flying on a heading of east or west decreases when flying closer to a north or south heading in a direct north or south heading this error does not occur in northern hemisphere compass swings towards north during acceleration towards south during deceleration in southern hemisphere this error occurs other way round when speed stabilises error disappears learn this for northern hemisphere ands ! a cceleration gives apparent turn to n orth d eceleration gives apparent turn to s outh. Question 45-14
The flux valve of a gyromagnetic compass 1 feeds error detector2 feeds direct indicating compass3 gives earth's magnetic field directionthe combination regrouping all of correct statements Due to north change depending on bank angle magnetic heading. the gyro magnetic compass made up of a magnetic detector unit (flux valve) which electrically senses direction of earth's magnetic field a gyroscope which points to a fixed point in space regardless of any manoeuvres aircraft makes an error detector to sense any difference between gyro magnetic headings apply corrections to gyro the magnetic detector unit (flux valve) feeds error detector with information about earth's magnetic field. Question 45-15
A flux valve Is usually located in wing tip to avoid as much as possible magnetic disturbances of airplane. the gyro magnetic compass made up of a magnetic detector unit (flux valve) which electrically senses direction of earth's magnetic field a gyroscope which points to a fixed point in space regardless of any manoeuvres aircraft makes an error detector to sense any difference between gyro magnetic headings apply corrections to gyro the magnetic detector unit (flux valve) feeds error detector with information about earth's magnetic field. Question 45-16
An electromagnet a type of magnet in which The magnetic field produced the flow of an electric current. Revised ecqb03 july 2016. Question 45-17
The inclination of earth magnetic field at magnetic equator equal to The magnetic field produced the flow of an electric current. Revised ecqb03 july 2016 at magnetic equator attraction of compass needle towards north south poles equal the needle remains unbiased as compass moved either north or south of magnetic equator attraction to nearest pole increased thus needle will be biased towards nearest pole this phenomenon called magnetic dip this compass error amplified with proximity to either pole. Question 45-18
The earth's north magnetic pole Is located approximately in northern canada. Revised ecqb03 july 2016 the earth's magnetic north located in hudson bay in canada the location of earth's magnetic poles periodically wanders (as much as 15 km every year). Question 45-19
In northern hemisphere during acceleration in a westerly heading a direct reading magnetic compass Indicates an apparent turn to north. Feedback cqb15 may 2012 acceleration/deceleration errors are false compass indications of a swing to north or south during speed changes of airplane this error most pronounced when flying on a heading of east or west decreases when flying closer to a north or south heading in a direct north or south heading this error does not occur in northern hemisphere compass swings towards north during acceleration towards south during deceleration in southern hemisphere this error occurs other way round when speed stabilises error disappears learn this for northern hemisphere ands ! a cceleration gives apparent turn to n orth d eceleration gives apparent turn to s outh. Question 45-20
The principle of compass swinging procedures to Determine amount which compass readings are affected hard soft iron magnetism. Revised ecqb03 july 2016 the compass swinging procedures the determination of deviations due to aircraft's magnetic field compass swinging (determination of initial deviations) compass compensation (correction of deviations found) compass calibration (determination of residual deviations). Question 45-21
Which of these statements about fundamental laws of magnetism are correct or incorrect 1 like poles attract2 unlike poles repel each other incorrect 2 incorrect. Cqb15 august 2012 warning! this question in database (n°1059) with statements 1 2 inverted ([1 unlike poles attract / 2 like poles repel each other )] like poles of magnets repel each other (north pole north pole south pole south pole) while different poles will attract each other (north pole south pole). Question 45-22
The force of attraction or repulsion between two magnets Varies inversely as square of distance between them. Cqb15 august 2012 the law of magnets states that like poles repel unlike poles attract if poles are concentrated at points this force between two poles proportional to product of their strengths varies inversely as square of distance between them. Question 45-23
The magnetic poles are two positions on earth's surface where lines of magnetic field Are entirely vertical. the force acting on a compass needle directly proportional to horizontal component of earth's field inversely proportional to vertical component of earth's at magnetic poles earth's magnetic field perpendicular to earth's surface magnetic dip 90° at magnetic poles (a dip needle stands vertical). Question 45-24
The purpose of a magnetic compass compensation to correct Are entirely vertical. the compass swinging procedures the determination of deviations due to aircraft's magnetic field compass swinging (determination of initial deviations) compass compensation (correction of deviations found) compass calibration (determination of residual deviations). Question 45-25
The purpose of a magnetic compass calibration to Determine residual deviations. Ecqb03 july 2016 the compass swinging procedures the determination of deviations due to aircraft's magnetic field compass swinging (determination of initial deviations) compass compensation (correction of deviations found) compass calibration (determination of residual deviations). Question 45-26
The location of earth's magnetic poles Periodically wanders (as much as 5 km every year). Ecqb03 july 2016 the compass swinging procedures the determination of deviations due to aircraft's magnetic field compass swinging (determination of initial deviations) compass compensation (correction of deviations found) compass calibration (determination of residual deviations). Question 45-27
Which of these statements about fundamental laws of magnetism are correct or incorrect 1 unlike poles attract2 like poles repel each other Periodically wanders (as much as 5 km every year). Ecqb03 july 2016 warning! this question in database (n°1025) with statements 1 2 inverted ([1 like poles attract / 2 unlike poles repel each other ) ] like poles of magnets repel each other (north pole north pole south pole south pole) while different poles will attract each other (north pole south pole). Question 45-28
Which of these statements about properties of a simple bar magnet are correct or incorrect 1 north or south poles cannot exist separately2 magnetism concentrated at extremities of bar correct 2 correct. Ecqb03 july 2016 warning! this question also exists at exam with first statement written like this [north or south poles can exist separately which in this case incorrect]. Question 45-29
The magnetic variation at any point on earth's surface the angle Between horizontal component of magnetic field true north direction. the minimum magnetic variation (declination) 0° the maximum magnetic variation (declination) 180°and this will be along a line between magnetic north pole the geographic north pole black arrow true north direction red arrow horizontal component of magnetic north. Question 45-30
The magnetic variation Is caused the different locations of geographic north pole the magnetic north pole. the minimum magnetic variation (declination) 0° the maximum magnetic variation (declination) 180°and this will be along a line between magnetic north pole the geographic north pole black arrow true north direction red arrow horizontal component of magnetic north. Question 45-31
The inclination of earth's magnetic field at north magnetic pole equal to Is caused the different locations of geographic north pole the magnetic north pole. the force acting on a compass needle directly proportional to horizontal component of earth's field inversely proportional to vertical component of earth's at magnetic poles earth's magnetic field perpendicular to earth's surface magnetic dip 90° at magnetic poles (a dip needle stands vertical). Question 45-32
Because of earth's magnetic field a compass placed anywhere on earth will turn so that north pole of magnet inside compass points towards Is caused the different locations of geographic north pole the magnetic north pole. Revised ecqb04 october 2017. Question 45-33
Which of following an occasion carrying out a compass swing on a direct reading compass After an aircraft has passed through a severe electrical storm or has been struck lightning. Revised ecqb04 october 2017. Question 45-34
The directive force of earth's magnetic field Is greatest at magnetic equator. at magnetic equator attraction of compass needle towards north south poles equal the needle remains unbiased as compass moved either north or south of magnetic equator attraction to nearest pole increased thus needle will be biased towards nearest pole this phenomenon called magnetic dip this compass error amplified with proximity to either pole directive force = horizontal component of earth's magnetic field. Question 45-35
The compass heading can be derived from magnetic heading reference to a Compass swinging curve. the magnetic heading can be derived from true heading means of a map showing isogonal lines the compass heading can be derived from magnetic heading reference to a compass swinging curve for information compass swinging (determination of initial deviations) compass compensation (correction of deviations found) compass calibration (determination of residual deviations). Question 45-36
The indications on a directional gyroscope are subject to errors the most significant are 1 apparent wander due to earth rotation2 apparent wander due to change of aircraft position3 gimballing errors4 north change5 mechanical defects the combination regrouping correct statement Compass swinging curve. the magnetic heading can be derived from true heading means of a map showing isogonal lines the compass heading can be derived from magnetic heading reference to a compass swinging curve for information compass swinging (determination of initial deviations) compass compensation (correction of deviations found) compass calibration (determination of residual deviations). Question 45-37
Graphic at reference shows three gyro assemblies a b and c among these gyros one a roll gyro noted 1 one a pitch gyro noted 2 one a yaw gyro noted 3 the correct matching of gyros and assemblies 1041 Compass swinging curve. the magnetic heading can be derived from true heading means of a map showing isogonal lines the compass heading can be derived from magnetic heading reference to a compass swinging curve for information compass swinging (determination of initial deviations) compass compensation (correction of deviations found) compass calibration (determination of residual deviations). Question 45-38
When an aircraft has turned 360 degrees with a constant attitude and bank pilot observes following on a classic artificial horizon Attitude bank correct. For a classic artificial horizon (air driven artificial horizon not an electric artificial horizon) since pendulous vanes are affected a horizontal acceleration as well as acceleration due to gravity errors in pitch roll indications will occur during turns centrifugal force will act on fore aft pendulous vanes (erection error) weighted base of rotor housing (pendulosity error) the errors are complex change as turn progresses cancelling out after a 360° turn the magnitude of errors varies with speed rate of turn type of horizon the following errors will occur after 90° of turn too much nose up bank too low after 180° of turn too much nose up bank correct after 270° of turn too much nose up too much bank after 360° of turn attitude bank correct. Question 45-39
When an aircraft has turned 90 degrees with a constant attitude and bank pilot observes following on a classic artificial horizon Too much nose up bank too low. For a classic artificial horizon (air driven artificial horizon not an electric artificial horizon) since pendulous vanes are affected a horizontal acceleration as well as acceleration due to gravity errors in pitch roll indications will occur during turns centrifugal force will act on fore aft pendulous vanes (erection error) weighted base of rotor housing (pendulosity error) the errors are complex change as turn progresses cancelling out after a 360° turn the magnitude of errors varies with speed rate of turn type of horizon the following errors will occur after 90° of turn too much nose up bank too low after 180° of turn too much nose up bank correct after 270° of turn too much nose up too much bank after 360° of turn attitude bank correct. Question 45-40
The gyroscope of a turn indicator has nb degree s of freedom of a gyro does not take into account its rotor spin axis Too much nose up bank too low. For a classic artificial horizon (air driven artificial horizon not an electric artificial horizon) since pendulous vanes are affected a horizontal acceleration as well as acceleration due to gravity errors in pitch roll indications will occur during turns centrifugal force will act on fore aft pendulous vanes (erection error) weighted base of rotor housing (pendulosity error) the errors are complex change as turn progresses cancelling out after a 360° turn the magnitude of errors varies with speed rate of turn type of horizon the following errors will occur after 90° of turn too much nose up bank too low after 180° of turn too much nose up bank correct after 270° of turn too much nose up too much bank after 360° of turn attitude bank correct.
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