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Question 283-1 : The si unit of a helicopter's mass is ? [ Attainment AIM ]

Kg

Question 283-2 : The rotor solidity is ?

The ratio of the total blade area to the disc area.

Rotor solidity has been defined as the ratio of total blade area to the disk area values for contemporary helicopters vary from about 006 to 012smaller helicopters generally tend to have lower solidity rotorsselecting the rotor solidity during the design process requires a careful consideration of blade stall limits that is the mean lift coefficient where the rotor performance will be stall limited
exemple 387: The ratio of the total blade area to the disc area
The ratio of the blade's number to the total blade area. the angle between blades and the no-flapping plane. the angle between plane of rotation and the rotor disc plane.

Question 283-3 : If the static lateral stability of an aeroplane is increased whilst its static directional stability remains constant ?

Its sensitivity to dutch roll increases.

exemple 391: Its sensitivity to dutch roll increases
Its spiral stability decreases. turning flight becomes more difficult. the nose-down pitching moment in a turn increases.

Question 283-4 : An aeroplane is sensitive to dutch roll when ?

Static lateral stability is much more pronounced than static directional stability.

exemple 395: Static lateral stability is much more pronounced than static directional stability
Static stability is less pronounced than dynamic stability. static directional stability is reduced. static directional stability is increased.

Question 283-5 : In what axis acts a 'phugoid' ?

Lateral axis.

2422
exemple 399: Lateral axis
Normal axis. longitudinal axis. vertical axis.

Question 283-6 : Which rotor have a quicker pitch response fully articulated rotor or teetering rotor ?

Fully articulated rotor.

exemple 403: Fully articulated rotor
Teetering rotor. both the same. none.

Question 283-7 : For a helicopter in steady forward flight what is the speed of the blade in front of the pilot ?

The rotational speed of the blade.

exemple 407: The rotational speed of the blade
The forward speed of the helicopter through the air. the rotational speed of the blade plus the forward speed of the helicopter through the air. the rotational speed of the blade minus the forward speed of the helicopter through the air.

Question 283-8 : What happens to the lift and drag of a blade when the angle of attack is increased beyond the stalling angle ?

Lift starts decreasing and drag remains increasing.

Ecqb01 february 2014
exemple 411: Lift starts decreasing and drag remains increasing
Lift and drag both start decreasing. lift remains increasing and drag starts decreasing. lift and drag remain the same beyond the stalling angle.

Question 283-9 : Changes in the center of pressure of a rotor blade affects ?

Aerodynamic balance and controllability.

Ecqb01 february 2014
exemple 415: Aerodynamic balance and controllability
Lifting capacity. lift/drag ratio. drag capacity.

Question 283-10 : With increasing helicopter airspeed the induced drag of the rotor blade ?

Reduces.

exemple 419: Reduces
Remains constant. reduces fast. increases slightly.

Question 283-11 : With increasing helicopter airspeed the profile drag ?

Increases slightly.

Ecqb01 february 2014
exemple 423: Increases slightly
Reduces rapidly. remains constant. reduces slightly.

Question 283-12 : How will lift coefficient behave when a pilot gradually increases the collective pitch ?

It increases and reaches maximum value at the critical angle of attack.

Ecqb01 february 2014
exemple 427: It increases and reaches maximum value at the critical angle of attack
It increases and reaches maximum value at the angle of attack for the best glide. it decreases and reaches minimum value at the angle of attack for minimum sink. it decreases and reaches minimum value at the angle of attack for minimum drag.

Question 283-13 : When we move the cyclic stick in such manner that the blade azimuth of 90° has themost increase of pitch the rotor disc will tilt ?

Backward.

Ecqb01 february 2014
exemple 431: Backward
Forward. left. right.

Question 283-14 : When we move the cyclic stick in such manner that the blade azimuth of 180° has the most increase of pitch the rotor disc will tilt ?

Right.

When we talk about azimuth you have to start counting the degrees from the rear of the main rotor in the rotation of the disc 2774
exemple 435: Right
Forward. backward. left.

Question 283-15 : When we move the cyclic stick in such manner that the blade azimuth of 270° has themost increase of pitch the rotor disc will tilt ?

Forward.

Ecqb01 february 2014
exemple 439: Forward
Backward. left. right.

Question 283-16 : When we move the cyclic stick in such manner that the blade azimuth of 000° has themost increase of pitch the rotor disc will tilt ?

Left.

Ecqb01 february 2014
exemple 443: Left
Right. backward. forward.

Question 283-17 : Blade flapping is a consequence of ?

Asymmetric relative airflow distribution on the rotor disc.

Ecqb01 february 2014
exemple 447: Asymmetric relative airflow distribution on the rotor disc
Asymmetric relative airflow distribution on the rotor surface. geometric blade twist. aerodynamic blade twist.

Question 283-18 : A helicopter in level flight and constant airspeed is turned into 30° bank so the lifting force has to ?

Increase specific disc loading increases.

Ecqb01 february 2014
exemple 451: Increase specific disc loading increases
Increase, specific disc loading decreases. decrease, specific disc loading decreases. decrease, specific disc loading increases.

Question 283-19 : Which helicopter design parameter fits the definition ratio between helicopter gross mass and rotor disc area ?

Disc loading.

Ecqb01 february 2014
exemple 455: Disc loading
Rotor solidity. disc area. rotor area.

Question 283-20 : Longitudinal stability of helicopter in flight is achieved through ?

Horizontal surfaces on the tail of the helicopter.

Ecqb01 february 2014
exemple 459: Horizontal surfaces on the tail of the helicopter
Vertical surfaces on the tail of the helicopter. can not be achieved on helicopters. horizontal and vertical surfaces on the tail of the helicopter.

Question 283-21 : We control the helicopter around the lateral axis with a ?

Cyclic stick.

Ecqb01 february 2014
exemple 463: Cyclic stick
Trimmer. tail rotor. collective stick.

Question 283-22 : We control the helicopter around the longitudinal axis with a ?

Cyclic stick.

Ecqb01 february 2014
exemple 467: Cyclic stick
Collective stick. tail rotor. trimmer.

Question 283-23 : The mach number is the ratio between the ?

Tas and the local speed of sound.

Mach number formula is mach number = tas lsstas is true airspeed expressed in knotslss is local speed of sound expressed in knots
exemple 471: Tas and the local speed of sound
Ias and the local speed of sound. tas and the speed of sound at sea level. increases for a given tas, when temperature increases.

Question 283-24 : Rolling is ?

The rotation of the helicopter about the longitudinal axis.

2422
The rotation of the helicopter about the lateral axis. the rotation of the helicopter about the vertical axis. the rotation of the helicopter about the main axis.

Question 283-25 : When hovering over long grass the power required to hover will be greater than that required over a smooth surface why is this ?

Greater recirculation of air through the rotor disc.

Ground effect is the increased efficiency of the rotor system caused by interference of the airflow when near the ground the air pressure or density is increased which acts to decrease the downward velocity of air ground effect permits relative wind to be more horizontal lift vector to be more vertical and induced drag to be reduced these conditions allow the rotor system to be more efficient maximum ground effect is achieved when hovering over smooth hard surfaceswhen hovering over surfaces as tall grass trees bushes rough terrain and water maximum ground effect is reducedrotor efficiency is increased by ground effect to a height of about one rotor diameter measured from the ground to the rotor disk for most helicopters since the induced flow velocities are decreased the aoa is increased which requires a reduced blade pitch angle and a reduction in induced drag this reduces the power required to hover in ground effect 1348when hovering over long grass the power required to hover will be greater than that required over a smooth surface it is similar to hovering outside ground effect since there is a greater recirculation of air through the rotor disc
exemple 479: Greater recirculation of air through the rotor disc
A decrease in the induced flow velocity through the rotor disc. increased air pressure below the rotor disc as the air can't flow smoothly away. an increase in the pressure above the rotor disc.

Question 283-26 : For a clockwise turning rotor drag divergence mach will appear on the blade azimuth ?

90°.

When we talk about azimuth you have to start counting the degrees from the rear of the main rotor in the rotation path of the disc 2774at 90° we are in the advancing side
exemple 483: 90°
270°. 0°. 180°.

Question 283-27 : If the continuity equation is applicable what will happen to the air density rho if the cross sectional area of a tube changes low speed subsonic and incompressible flow ?

Rho1 = rho2.

exemple 487: Rho1 = rho2
The density depends on the change of the tube area. rho1 > rho2. rho1 < rho2.

Question 283-28 : A message concerning aircraft parts and material urgently required is ?

A flight regularity message.

Icao annex 10 1075186 flight regularity messages shall comprise the following 1 messages regarding the operation or maintenance of facilities essential for the safety or regularity of aircraft operation2 messages concerning the servicing of aircraft3 instructions to aircraft operating agency representatives concerning changes in requirements for passengers and crew caused by unavoidable deviations from normal operating schedules individual requirements of passengers or crew shall not be admissible in this type of message4 messages concerning non routine landings to be made by the aircraft5 messages concerning aircraft parts and materials urgently required6 messages concerning changes in aircraft operating schedules
exemple 491: A flight regularity message
A flight safety message. a flight security message. an urgency message.

Question 283-29 : A message concerning an aircraft being threatened by grave and imminent danger requiring immediate assistance is called ?

Distress message.

Img651
exemple 495: Distress message
Class b message. urgency message. flight safety message.

Question 283-30 : Air traffic control messages clearances instructions etc belong to the category of ?

Flight safety messages.

Icao annex 10 1075184 flight safety messages shall comprise the following 1 movement and control messages2 messages originated by an aircraft operating agency or by an aircraft of immediate concern to an aircraft inflight3 meteorological advice of immediate concern to an aircraft in flight or about to depart individually communicated or for broadcast 4 other messages concerning aircraft in flight or about to depart
exemple 499: Flight safety messages
Class b messages. flight regularity messages. service messages.

Question 283-31 : Flight safety messages are ?

Air traffic control messages.

Icao annex 10 1075184 flight safety messages shall comprise the following 1 movement and control messages 2 messages originated by an aircraft operating agency or by an aircraft of immediate concern to an aircraft inflight3 meteorological advice of immediate concern to an aircraft in flight or about to depart individually communicated or for broadcast 4 other messages concerning aircraft in flight or about to depart
exemple 503: Air traffic control messages
Messages relating to direction finding. operation messages concerning non-routine landings. messages concerning the safety of an aircraft, a vessel, any other vehicle or a person.

Question 283-32 : Regardless of your position time figures are transmitted with reference to ?

Utc.

exemple 507: Utc
Local time winter time greenwich time

Question 283-33 : The clearance 'cleared for immediate take off runway 03' is ?

A flight safety message.

Question 283-34 : The message addressed to an area control center request radar vectors to circumnavigate adverse weather is ?

A flight safety message.

Icao annex 10 1075184 flight safety messages shall comprise the following 1 movement and control messages 2 messages originated by an aircraft operating agency or by an aircraft of immediate concern to an aircraft inflight3 meteorological advice of immediate concern to an aircraft in flight or about to depart individually communicated or for broadcast 4 other messages concerning aircraft in flight or about to depart
exemple 515: A flight safety message
A meteorological message. an urgency message. a message relating to direction finding.

Question 283-35 : The message to an aeronautical ground station 'please call a taxi cab for us we will arrive at 1045' is ?

An unauthorized message.

Icao annex 10 1075186 flight regularity messages shall comprise thefollowing 1 messages regarding the operation or maintenance of facilities essential for the safety or regularity of aircraft operation2 messages concerning the servicing of aircraft3 instructions to aircraft operating agency representatives concerning changes in requirements for passengers and crew caused by unavoidable deviations from normal operating schedules individual requirements of passengers or crew shall not be admissible in this type of message4 messages concerning non routine landings to be made by the aircraft5 messages concerning aircraft parts and materials urgently required6 messages concerning changes in aircraft operating schedulesthe message ' please call a taxi cab for us we will arrive at 1045 ' is an unauthorized message
exemple 519: An unauthorized message
An urgency message. a flight regularity message. a flight safety messages.

Question 283-36 : The order of priority of the following messages in the aeronautical mobile service is ?

Flight safety message meteorological message flight regularity message.

Img115flight safety messages shall comprise the following 1 movement and control messages2 messages originated by an aircraft operating agency or by an aircraft of immediate concern to an aircraft inflight3 meteorological advice of immediate concern to an aircraft in flight or about to depart4 other messages concerning aircraft in flight or about to departmeteorological messages shall comprise meteorological information to or from aircraftflight regularity messages shall comprise the following 1 messages regarding the operation or maintenance of facilities essential for the safety or regularity of aircraft operation2 messages concerning the servicing of aircraft3 instructions to aircraft operating agency representatives concerning changes in requirements for passengers and crew caused by unavoidable deviations from normal operating schedules individual requirements of passengers or crew shall not be admissible in this type of message4 messages concerning non routine landings to be made by the aircraft5 messages concerning aircraft parts and materials urgently required6 messages concerning changes in aircraft operating schedules
exemple 523: Flight safety message meteorological message flight regularity message
Flight safety message, direction finding message, urgency message. flight regularity message, distress message, meteorological message. meteorological message, direction finding message, flight safety message.

Question 283-37 : The order of priority of the following messages in the aeronautical mobile service is ?

Distress message urgency message direction finding message.

Img115flight safety messages shall comprise the following 1 movement and control messages2 messages originated by an aircraft operating agency or by an aircraft of immediate concern to an aircraft inflight3 meteorological advice of immediate concern to an aircraft in flight or about to depart4 other messages concerning aircraft in flight or about to departmeteorological messages shall comprise meteorological information to or from aircraftflight regularity messages shall comprise the following 1 messages regarding the operation or maintenance of facilities essential for the safety or regularity of aircraft operation2 messages concerning the servicing of aircraft3 instructions to aircraft operating agency representatives concerning changes in requirements for passengers and crew caused by unavoidable deviations from normal operating schedules individual requirements of passengers or crew shall not be admissible in this type of message4 messages concerning non routine landings to be made by the aircraft5 messages concerning aircraft parts and materials urgently required6 messages concerning changes in aircraft operating schedules
exemple 527: Distress message urgency message direction finding message
Meteorological message, direction finding message, flight regularity message. distress message, flight safety message, urgency message. direction finding message, distress message, urgency message.

Question 283-38 : The priority of the instruction taxi to runway 05 is ?

Same as line up runway 07 and wait .

Img115flight safety messages shall comprise the following 1 movement and control messages2 messages originated by an aircraft operating agency or by an aircraft of immediate concern to an aircraft inflight3 meteorological advice of immediate concern to an aircraft in flight or about to depart4 other messages concerning aircraft in flight or about to departmeteorological messages shall comprise meteorological information to or from aircraftflight regularity messages shall comprise the following 1 messages regarding the operation or maintenance of facilities essential for the safety or regularity of aircraft operation2 messages concerning the servicing of aircraft3 instructions to aircraft operating agency representatives concerning changes in requirements for passengers and crew caused by unavoidable deviations from normal operating schedules individual requirements of passengers or crew shall not be admissible in this type of message4 messages concerning non routine landings to be made by the aircraft5 messages concerning aircraft parts and materials urgently required6 messages concerning changes in aircraft operating schedules taxi to runway 05 and line up runway 07 and wait are both flight safety messages
exemple 531: Same as line up runway 07 and wait
Less than “cleared to land”. greater than “transmit for qdm”. greater than “caution, construction work left of taxiway”.

Question 283-39 : The priority of the pilot's message 'request qdm' is ?

Greater than 'turn left heading'.

Img115flight safety messages shall comprise the following 1 movement and control messages2 messages originated by an aircraft operating agency or by an aircraft of immediate concern to an aircraft inflight3 meteorological advice of immediate concern to an aircraft in flight or about to depart4 other messages concerning aircraft in flight or about to departmeteorological messages shall comprise meteorological information to or from aircraftflight regularity messages shall comprise the following 1 messages regarding the operation or maintenance of facilities essential for the safety or regularity of aircraft operation2 messages concerning the servicing of aircraft3 instructions to aircraft operating agency representatives concerning changes in requirements for passengers and crew caused by unavoidable deviations from normal operating schedules individual requirements of passengers or crew shall not be admissible in this type of message4 messages concerning non routine landings to be made by the aircraft5 messages concerning aircraft parts and materials urgently required6 messages concerning changes in aircraft operating schedules' request qdm ' is a message relating to direction finding' turn left heading ' is a flight safety message
exemple 535: Greater than 'turn left heading'
Same as 'latest qnh 1018'. less than 'descend to flight level...' less than 'request climb to flight level...'

Question 283-40 : What does qdm mean ?

Magnetic heading to the station no wind .

Qdm means magnetic heading to the station with no wind 118the aircraft is on radial 240° qdr 240° on a magnetic heading of 360°if the pilot wants to reach the station he must follow the qdm 060° 119the aircraft is on radial 150° qdr 150° on a magnetic heading of 060°if the pilot wants to reach the station he must follow qdm 150° 120the aircraft is on radial 090° qdr 090° on a magnetic heading of 270°by following the qdm 270° the pilot will fly over the station
exemple 539: Magnetic heading to the station no wind
True bearing from the station. magnetic bearing from the station. true heading to the station (no wind).



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