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When climbing at a constant cas in standard atmosphere ? [ Understand DGAC ]

Question 47-1 : Tas increases tas decreases tas remains constant tas first decreases then remains constant above the tropopause

Admin .for those questions use the very simple 'ertm' diagram . 1037.the cas line is vertical because the question states climbing at a constant cas . ertm for e as/ r as rectified air speed or cas / t as/ m ach exemple 147 Tas increases.Tas increases.

The compressibility error must be taken into account only for aeroplane with ?

Question 47-2 : Tas greater than approximately 200 kt tas greater than approximately 100 km/h mach number greater than 0 8 mach number greater or equal to 1

exemple 151 Tas greater than approximately 200 kt.Tas greater than approximately 200 kt.

An aeroplane is flying at fl300 and mach number 0 76 .the indicated total air ?

Question 47-3 : Standard standard +26°c standard 26°c standard +10°c

Revised ecqb03 july 2016 ..the total temperature can be expressed approximately by the formula .tt = ts 1 + 0 2 kr m² .. ts the static temperature sat in kelvin. tt the total temperature tat in kelvin. kr the recovery coefficient. m the mach number..254 15 = ts 1 + 0 2 kr m² .ts = 254 15 / 1 + 0 2 x 0 96 x 0 5776 .ts = 254 15 / 1 11 = 229° k..oat = 273 15 229 = 44 15°c .at fl300 isa temperature is .15°c 2°c x 30 = 45°c .we can say that oat is standard exemple 155 Standard.Standard.

The alternate static source of a light non pressurized aeroplane is located in ?

Question 47-4 : Tends to over read tends to under read indicates zero is blocked

Admin .the alternate static vent of an unpressurised aircraft senses the air pressure in the flight deck/cockpit in flight the air outside the flight deck accelerates over the aircraft canopy venturi effect this causes a drop in static pressure air will always flow from a high pressure to a low pressure so air in the flight deck flows outside this flow to the outside causes the pressure in the cabin to be lower than the undisturbed static pressure around the aircraft .the altimeter will sense a lower pressure than the outside pressure it will tend to over read exemple 159 Tends to over-read.Tends to over-read.

The alternate static source of a light non pressurized aeroplane is located in ?

Question 47-5 : The airspeed indicator tends to over read the airspeed indicator tends to under read the airspeed indicator indicates a consistent decreasing speed it has no influence on airspeed indicator reading

Admin .the alternate static vent of a unpressurised aircraft senses the air pressure in the flight deck/cockpit in flight the air outside the flight deck accelerates over the aircraft canopy venturi effect this causes a drop in static pressure air will always flow from a high pressure to a low pressure so air in the flight deck flows outside this flow to the outside causes the pressure in the cabin to be lower than the undisturbed static pressure around the aircraft exemple 163 The airspeed indicator tends to over-read.The airspeed indicator tends to over-read.

An airplane is flying at fl140 with a cas of 260 kt in standard conditions the ?

Question 47-6 : 0 51 0 53 0 41 0 43

Admin .isa temperature at fl140 is 13°c on the nav computer find tas . 982.next step find mach number . 983.jripoche .tas=ias+2%/1000ft=332 8kt.oat= 12 72°c=260 43°k.mn=332 8/ 38 94sqrt260 43 =0 5295.so the most accurate answer shouldn't be 0 53 . .cas = ias in the absence of position and instrument errors .you can't say cas = ias without those informations exemple 167 0.510.51

An aeroplane is flying at fl300 with a tas of 470 kt in standard conditions the ?

Question 47-7 : 0 8 0 82 0 83 0 53

..in standard conditions at fl300 temperature is .15°c 30 x 2°c = 45°. 1026.set 45° in airpseed window in front of 'm kt' indicator .read in the inner scale in front of 470 kt a mach number of 0 805 exemple 171 0.80.8

During a climb at a constant cas below the tropopause in standard atmosphere ?

Question 47-8 : The mach number increases and the speed of sound decreases the mach number decreases and the speed of sound increases the mach number and the speed of sound increase the mach number and the speed of sound decrease

Admin .for those questions use the very simple 'ertm' diagram . 1037.the cas line is vertical because the question states climbing at a constant cas . ertm for e as/ r as rectified air speed or cas / t as/ m ach .the velocity of sound is decreasing as temperature decreases .mach number = tas / local sound speed exemple 175 The mach number increases and the speed of sound decreases.The mach number increases and the speed of sound decreases.

A servo assisted altimeter is more accurate than a simple altimeter because the ?

Question 47-9 : The capsules are detected by a very sensitive electro magnetic pick off the pointers are detected by a very sensitive electro magnetic pick off the capsules are inhibited the capsules are not taken into account

exemple 179 The capsules are detected by a very sensitive electro-magnetic pick-off.The capsules are detected by a very sensitive electro-magnetic pick-off.

An aeroplane is flying at fl100 and mach number 0 76 the indicated total air ?

Question 47-10 : 44°c 54°c 41°c 51°c

Admin .the total temperature can be expressed approximately by the formula .tt = ts 1 + 0 2 kr m² . ts the static temperature sat in kelvin. tt the total temperature tat in kelvin. kr the recovery coefficient. m the mach number..254 15 = ts 1 + 0 2 kr m² .ts = 254 15 / 1 + 0 2 x 0 96 x 0 5776 .ts = 254 15 / 1 11 = 229° k.273 15 229 = 44 15°c exemple 183 -44°c.-44°c.

Concerning the pitot and static system the position error varies with .1 ?

Question 47-11 : 2 3 1 3 1 2 3 1 2

Cqb15 may 2012..this question exists n°626 in the database with static pressure error varies instead of position error varies .statement n°2 speed is replaced here by 'mach number' exemple 187 2, 3.2, 3.

An aeroplane is flying at fl 320 and mach number 0 79 .the oat is 53°c ?

Question 47-12 : 27°c standard 34°c 10°c

Ecqb03 july 2016 ..the total temperature can be expressed approximately by the formula .tt = ts 1 + 0 2 kr m² .. ts the static temperature sat in kelvin. tt the total temperature tat in kelvin. kr the recovery coefficient. m the mach number..tt = 220°k 1 + 0 2 x 0 96 x 0 79² .tt = 220°k 1 + 0 12 .tt = 246°k..tt = 273 15 246 = 26 75°c exemple 191 -27°c.-27°c.

Which of these statements is true ?

Question 47-13 : The probes used for sat measurements have a recovery factor of 0 75 to 0 90 while the probes used for tat measurements have a recovery factor of around 1 00 the probes used for sat measurements have a recovery factor of around 1 00 the probes used for tat measurements are directly connected to the temperature indicator instruments the probes used for sat measurements have a recovery factor ranging from 75 to 90 percent

Ecqb03 july 2016..recovery factor refers to the amount of ram rise that is recoverable by the sensor total head thermometers typically have a recovery factor of 0 75 to 0 9 whereas the rosemount temperature probe has a recovery factor of 1 0 the ram rise is due to adiabatic compression and for simple sat temperature sensors used on light aircraft that fly at speeds less than mach 0 2 the ram rise factor does not apply the sat sensor measures the actual temperature and is therefore 100% efficient tat is always equal to or higher than sat due to ram rise ..the formula's typically used are tat = sat + ram rise.or.tat = sat x 1 + 0 2 kr m² where kr is the recovery factor and m the mach number ..ram rise comes into effect at airspeeds greater than m 0 2..in summary sat temperature sensors are not affected by ram rise whereas tat sensors are exemple 195 The probes used for sat measurements have a recovery factor of 0.75 to 0.90, while the probes used for tat measurements have a recovery factor of around 1.00.The probes used for sat measurements have a recovery factor of 0.75 to 0.90, while the probes used for tat measurements have a recovery factor of around 1.00.

An aeroplane is in a steady descend the auto throttle maintains a constant mach ?

Question 47-14 : Increases decreases remains constant decreases if the static temperature is lower than the standard temperature increases if higher

Img964 exemple 199 Increases.Increases.

In a gyromagnetic compass the direction of the earth's magnetic field is given ?

Question 47-15 : Flux valve adc direct indicating compass directional gyro

A flux valve is a sensitive detector that receives an electrical signal from the earth's magnetic field and directs it to an amplifier and then into a gyro stabilized compass indicator exemple 203 Flux valve.Flux valve.

The magnetic heading can be derived from the true heading by means of a ?

Question 47-16 : Map showing the isogonal lines map showing the isoclinic lines deviation correction curve compass swinging curve

Admin . 1425.isogonic lines connect positions that have the same variation .agonic line a line which joins all points where the value of magnetic variation is zero .magnetic heading is the direction that the aircraft is pointing in relation to magnetic north .true heading is the direction that the aircraft is pointing in relation to true north .since true north directly over the earth's axis of rotation and magnetic north somewhere over northern canada are not at the same place both headings often differ .to find out the difference at a particular location look at the isogonic lines on your area the lines labeled 20°e 15°e 10°e etc they will indicate the magnetic deviation .to get the true heading simply take the reading from the magnetic compass and either add an easterly or subtract a westerly magnetic deviation exemple 207 Map showing the isogonal lines.Map showing the isogonal lines.

The fields affecting a magnetic compass originate from .1 magnetic masses .2 ?

Question 47-17 : 1 2 4 1 2 3 1 2 3 4 1 3 4

exemple 211 1, 2, 4.1, 2, 4.

The input signal of the amplifier of the gyromagnetic compass resetting device ?

Question 47-18 : Error detector flux valve directional gyro unit directional gyro erection device

The flux valve sends a signal containing information on the earth's magnetic field but not at this stage carrying any information about the 'error' between the compass display and and aircraft heading the 'error' is detected at the selsyn with its 'error detector' the selsyn now sends information on the error to the amplfier and precession systems that reduce the error to zero .selsyn or synchro is an electro mechanical device used for the easy and precise transmission of angular data between two or more remote points exemple 215 Error detector.Error detector.

In the gyromagnetic compass the heading information from the flux valve is sent ?

Question 47-19 : Error detector erector system heading indicator amplifier

exemple 219 Error detector.Error detector.

The gyromagnetic compass torque motor ?

Question 47-20 : Causes the directional gyro unit to precess causes the heading indicator to precess feeds the error detector system is fed by the flux valve

exemple 223 Causes the directional gyro unit to precess.Causes the directional gyro unit to precess.

A pilot wishes to turn left on to a southerly heading with 20° bank at a ?

Question 47-21 : 160° 200° 170° 190°

Admin .in the 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 and bank angle due to acceleration .to calculate the value use this approximation formula . bank angle + latitude /2. 20°bank + 20°latitude /2 = 20° .180° 20° = 160° exemple 227 160°.160°.

A pilot wishes to turn left on to a northerly heading with 10° bank at a ?

Question 47-22 : 030° 355° 330° 015°

Admin .in the 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 and bank angle due to acceleration .to calculate the value use this approximation formula . bank angle + latitude /2. 10°bank + 50°latitude /2 = 30° .000° 30° = 030° exemple 231 030°030°

A gyromagnetic compass is a system which always consists of . 1 a horizontal ?

Question 47-23 : 1 3 4 5 1 4 2 3 5 2 3

exemple 235 1, 3, 4, 5.1, 3, 4, 5.

In a gyromagnetic compass the flux valve feeds the ?

Question 47-24 : Error detector erecting system heading indicator amplifier

.the gyro magnetic compass is made up of . a magnetic detector unit flux valve which electrically senses the direction of earth's magnetic field . a gyroscope which points to a fixed point in space regardless of any manoeuvres the aircraft makes . an error detector to sense any difference between the gyro and magnetic headings and apply corrections to the gyro .the magnetic detector unit flux valve feeds the error detector with information about the earth's magnetic field exemple 239 Error detector.Error detector.

The operating principle of the vertical speed indicator vsi is based on the ?

Question 47-25 : Static pressure dynamic pressure total pressure kinetic pressure

A pilot wishes to turn right through 90° on to north at rate 2 at latitude of ?

Question 47-26 : 330° 360° 030° 010°

Admin .in the 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 and bank angle due to acceleration .only 330° is an undershoot value when you perform a right turn to the north exemple 247 330°.330°.

An aircraft takes off on a runway with an alignment of 045° the compass is ?

Question 47-27 : A value below 045° 045° a value above 045° in the southern hemisphere a value above 045° in the northern hemisphere

Acceleration/deceleration errors are false compass indications of a swing to the north or south during speed changes of the airplane this error is most pronounced when flying on a heading of east or west and decreases when flying closer to a north or south heading in a direct north or south heading this error does not occur .in the northern hemisphere the compass swings towards the north during acceleration and towards the south during deceleration in the southern hemisphere this error occurs the other way round when the speed stabilises the error disappears .learn this for northern hemisphere ands . a cceleration gives apparent turn to n orth . d eceleration gives apparent turn to s outh exemple 251 A value below 045°.A value below 045°.

In the northern hemisphere during deceleration following a landing in a ?

Question 47-28 : No apparent turn an apparent turn to the east an apparent turn to the west an apparent turn to the south

Acceleration/deceleration errors are false compass indications of a swing to the north or south during speed changes of the airplane this error is most pronounced when flying on a heading of east or west and decreases when flying closer to a north or south heading in a direct north or south heading this error does not occur .in the northern hemisphere the compass swings towards the north during acceleration and towards the south during deceleration in the southern hemisphere this error occurs the other way round when the speed stabilises the error disappears .learn this for northern hemisphere ands . a cceleration gives apparent turn to n orth . d eceleration gives apparent turn to s outh exemple 255 No apparent turn.No apparent turn.

In the northern hemisphere during deceleration following a landing in a ?

Question 47-29 : No apparent turn an apparent turn to the east an apparent turn to the west an apparent turn to the north

Acceleration/deceleration errors are false compass indications of a swing to the north or south during speed changes of the airplane this error is most pronounced when flying on a heading of east or west and decreases when flying closer to a north or south heading in a direct north or south heading this error does not occur .in the northern hemisphere the compass swings towards the north during acceleration and towards the south during deceleration in the southern hemisphere this error occurs the other way round when the speed stabilises the error disappears .learn this for northern hemisphere ands . a cceleration gives apparent turn to n orth . d eceleration gives apparent turn to s outh exemple 259 No apparent turn.No apparent turn.

During deceleration following a landing in a westerly direction a magnetic ?

Question 47-30 : An apparent turn to the south an apparent turn to the north no apparent turn no apparent turn only on northern latitudes

Acceleration/deceleration errors are false compass indications of a swing to the north or south during speed changes of the airplane this error is most pronounced when flying on a heading of east or west and decreases when flying closer to a north or south heading in a direct north or south heading this error does not occur .in the northern hemisphere the compass swings towards the north during acceleration and towards the south during deceleration in the southern hemisphere this error occurs the other way round when the speed stabilises the error disappears .learn this for northern hemisphere ands . a cceleration gives apparent turn to n orth . d eceleration gives apparent turn to s outh exemple 263 An apparent turn to the south.An apparent turn to the south.

During deceleration following a landing in a westerly direction a magnetic ?

Question 47-31 : An apparent turn to the north an apparent turn to the south no apparent turn no apparent turn only on southern latitudes

.acceleration/deceleration errors are false compass indications of a swing to the north or south during speed changes of the airplane this error is most pronounced when flying on a heading of east or west and decreases when flying closer to a north or south heading in a direct north or south heading this error does not occur .in the northern hemisphere the compass swings towards the north during acceleration and towards the south during deceleration in the southern hemisphere this error occurs the other way round when the speed stabilises the error disappears .learn this for northern hemisphere ands . a cceleration gives apparent turn to n orth . d eceleration gives apparent turn to s outh exemple 267 An apparent turn to the north.An apparent turn to the north.

During deceleration following a landing in an easterly direction a magnetic ?

Question 47-32 : An apparent turn to the south an apparent turn to the north no apparent turn no apparent turn only on northern latitudes

.acceleration/deceleration errors are false compass indications of a swing to the north or south during speed changes of the airplane this error is most pronounced when flying on a heading of east or west and decreases when flying closer to a north or south heading in a direct north or south heading this error does not occur .in the northern hemisphere the compass swings towards the north during acceleration and towards the south during deceleration in the southern hemisphere this error occurs the other way round when the speed stabilises the error disappears .learn this for northern hemisphere ands . a cceleration gives apparent turn to n orth . d eceleration gives apparent turn to s outh exemple 271 An apparent turn to the south.An apparent turn to the south.

During deceleration following a landing in an easterly direction a magnetic ?

Question 47-33 : An apparent turn to the north an apparent turn to the south no apparent turn no apparent turn only on southern latitudes

.acceleration/deceleration errors are false compass indications of a swing to the north or south during speed changes of the airplane this error is most pronounced when flying on a heading of east or west and decreases when flying closer to a north or south heading in a direct north or south heading this error does not occur .in the northern hemisphere the compass swings towards the north during acceleration and towards the south during deceleration in the southern hemisphere this error occurs the other way round when the speed stabilises the error disappears .learn this for northern hemisphere ands . a cceleration gives apparent turn to n orth . d eceleration gives apparent turn to s outh exemple 275 An apparent turn to the north.An apparent turn to the north.

About a magnetic compass ?

Question 47-34 : Turning error is due to the vertical component of the earth's magnetic field acceleration errors are due to the angle of dip acceleration errors are due to schuler oscillations errors of parallax are due to the oscillation of the compass rose

exemple 279 Turning error is due to the vertical component of the earth's magnetic field.Turning error is due to the vertical component of the earth's magnetic field.

A pilot wishes to turn right on to a southerly heading with 20° bank at a ?

Question 47-35 : 200° 150° 170° 180°

Admin .in the 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 and bank angle due to acceleration .to calculate the value use this approximation formula .heading = 180° + bank angle + latitude /2.heading = 180 + 20 + 20 / 2.heading = 180° + 20° = 200° exemple 283 200°.200°.

The turning errors of a direct reading magnetic compass are ?

Question 47-36 : Maximum at the magnetic poles maximum at the magnetic equator minimum at a latitude of 45° minimum at the magnetic poles

.at the magnetic equator the attraction of the compass needle towards the north and south poles is equal and the needle remains unbiased as the compass is moved either north or south of the magnetic equator the attraction to the nearest pole is increased thus the needle will be biased towards the nearest pole . 1006.this phenomenon is called magnetic dip and this compass error is amplified with the proximity to either pole exemple 287 Maximum at the magnetic poles.Maximum at the magnetic poles.

A flux valve detects the horizontal component of the earth's magnetic field .1 ?

Question 47-37 : 2 4 1 2 1 2 4 3 4

Admin .the magnetic detector unit flux valve is fixed to the aircraft it feeds the error detector with information about the earth's magnetic field it is made of three soft iron bars this system is very accurate accuracy on the value of the magnetic field indication is less than 0 5° exemple 291 2, 4.2, 4.

The direct reading magnetic compass is no more reliable when approaching . 1 ?

Question 47-38 : 1 1 2 3 1 2 1 3

exemple 295 11

In the northern hemisphere during a take off run in a westerly direction a ?

Question 47-39 : An apparent turn to the north an apparent turn to the south no apparent turn an apparent turn to approximately the heading 255°

Acceleration/deceleration errors are false compass indications of a swing to the north or south during speed changes of the airplane this error is most pronounced when flying on a heading of east or west and decreases when flying closer to a north or south heading in a direct north or south heading this error does not occur .in the northern hemisphere the compass swings towards the north during acceleration and towards the south during deceleration in the southern hemisphere this error occurs the other way round when the speed stabilises the error disappears .learn this for northern hemisphere ands . a cceleration gives apparent turn to n orth . d eceleration gives apparent turn to s outh exemple 299 An apparent turn to the north.An apparent turn to the north.

In the northern hemisphere during the take off run in an easterly direction a ?

Question 47-40 : An apparent turn to the north an apparent turn to the south no apparent turn an apparent turn to approximately the heading 100°

Acceleration/deceleration errors are false compass indications of a swing to the north or south during speed changes of the airplane this error is most pronounced when flying on a heading of east or west and decreases when flying closer to a north or south heading in a direct north or south heading this error does not occur .in the northern hemisphere the compass swings towards the north during acceleration and towards the south during deceleration in the southern hemisphere this error occurs the other way round when the speed stabilises the error disappears .learn this for northern hemisphere ands . a cceleration gives apparent turn to n orth . d eceleration gives apparent turn to s outh exemple 303 An apparent turn to the north.An apparent turn to the north.

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