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Question 260-1 : The si unit of power is ? [ Theoretical lift off ]

W.

.symbol is w, unit is watt. exemple 360 W.

Question 260-2 : The correct formula to calculate the tip circumferential speed nr revolutions per min and r rotor radius is ?

R x nr.

exemple 364 R x nr.

Question 260-3 : The si unit of a helicopter's mass is ?

Kg.

exemple 368 Kg.

Question 260-4 : 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 0.06 to 0.12..smaller helicopters generally tend to have lower solidity rotors..selecting 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 372 The ratio of the total blade area to the disc area.

Question 260-5 : If the static lateral stability of an aeroplane is increased, whilst its static directional stability remains constant ?

Its sensitivity to dutch roll increases.

exemple 376 Its sensitivity to dutch roll increases.

Question 260-6 : An aeroplane is sensitive to dutch roll when ?

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

exemple 380 Static lateral stability is much more pronounced than static directional stability.

Question 260-7 : In what axis acts a 'phugoid' ?

Lateral axis.

. 2422 exemple 384 Lateral axis.

Question 260-8 : Which rotor have a quicker pitch response, fully articulated rotor or teetering rotor ?

Fully articulated rotor.

exemple 388 Fully articulated rotor.

Question 260-9 : 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 392 The rotational speed of the blade.

Question 260-10 : 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 396 Lift starts decreasing and drag remains increasing.

Question 260-11 : Changes in the center of pressure of a rotor blade affects ?

Aerodynamic balance and controllability.

Ecqb01 february 2014 exemple 400 Aerodynamic balance and controllability.

Question 260-12 : With increasing helicopter airspeed the induced drag of the rotor blade ?

Reduces.

exemple 404 Reduces.

Question 260-13 : With increasing helicopter airspeed the profile drag ?

Increases slightly.

Ecqb01 february 2014 exemple 408 Increases slightly.

Question 260-14 : 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 412 It increases and reaches maximum value at the critical angle of attack.

Question 260-15 : When we move the cyclic stick in such manner that the blade azimuth of 90° has the.most increase of pitch, the rotor disc will tilt ?

Backward.

Ecqb01 february 2014 exemple 416 Backward.

Question 260-16 : 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 420 Right.

Question 260-17 : When we move the cyclic stick in such manner that the blade azimuth of 270° has the.most increase of pitch, the rotor disc will tilt ?

Forward.

Ecqb01 february 2014 exemple 424 Forward.

Question 260-18 : When we move the cyclic stick in such manner that the blade azimuth of 000° has the.most increase of pitch, the rotor disc will tilt ?

Left.

Ecqb01 february 2014 exemple 428 Left.

Question 260-19 : Blade flapping is a consequence of ?

Asymmetric relative airflow distribution on the rotor disc.

Ecqb01 february 2014 exemple 432 Asymmetric relative airflow distribution on the rotor disc.

Question 260-20 : 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 436 Increase, specific disc loading increases.

Question 260-21 : Which helicopter design parameter fits the definition ratio between helicopter gross mass and rotor disc area ?

Disc loading.

Ecqb01 february 2014 exemple 440 Disc loading.

Question 260-22 : Longitudinal stability of helicopter in flight is achieved through ?

Horizontal surfaces on the tail of the helicopter.

Ecqb01 february 2014 exemple 444 Horizontal surfaces on the tail of the helicopter.

Question 260-23 : We control the helicopter around the lateral axis with a ?

Cyclic stick.

Ecqb01 february 2014 exemple 448 Cyclic stick.

Question 260-24 : We control the helicopter around the longitudinal axis with a ?

Cyclic stick.

Ecqb01 february 2014 exemple 452 Cyclic stick.

Question 260-25 : The mach number is the ratio between the ?

Tas and the local speed of sound.

.mach number formula is.mach number = tas / lss..tas is true airspeed expressed in knots..lss is local speed of sound expressed in knots. exemple 456 Tas and the local speed of sound.

Question 260-26 : Rolling is ?

The rotation of the helicopter about the longitudinal axis.

. 2422 exemple 460 The rotation of the helicopter about the longitudinal axis.

Question 260-27 : 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 surfaces..when hovering over surfaces as tall grass, trees, bushes, rough terrain, and water, maximum ground effect is reduced..rotor 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.. 1348.when 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 464 Greater recirculation of air through the rotor disc.

Question 260-28 : 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. 2774.at 90° we are in the advancing side.

Question 260-29 : 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 472 Rho1 = rho2.

Question 260-30 : A message concerning aircraft parts and material urgently required is ?

A flight regularity message.

Icao annex 10. 107..5.1.8.6 flight regularity messages shall comprise the following..1 messages regarding the operation or maintenance of facilities essential for the safety or regularity of aircraft operation,..2 messages concerning the servicing of aircraft,..3 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 message,..4 messages concerning non routine landings to be made by the aircraft,..5 messages concerning aircraft parts and materials urgently required,..6 messages concerning changes in aircraft operating schedules. exemple 476 A flight regularity message.

Question 260-31 : A message concerning an aircraft being threatened by grave and imminent danger, requiring immediate assistance is called ?

Distress message.

Img651 exemple 480 Distress message.

Question 260-32 : Air traffic control messages clearances, instructions, etc. belong to the category of ?

Flight safety messages.

Icao annex 10. 107..5.1.8.4 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 inflight,..3 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 484 Flight safety messages.

Question 260-33 : Flight safety messages are ?

Air traffic control messages.

Icao annex 10. 107..5.1.8.4 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 inflight,..3 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 488 Air traffic control messages.

Question 260-34 : Regardless of your position, time figures are transmitted with reference to ?

Utc

exemple 492 Utc

Question 260-35 : The clearance 'cleared for immediate take off runway 03' is ?

A flight safety message.

exemple 496 A flight safety message.

Question 260-36 : The message addressed to an area control center 'request radar vectors to circumnavigate adverse weather' is ?

A flight safety message.

Icao annex 10. 107..5.1.8.4 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 inflight,..3 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 500 A flight safety message.

Question 260-37 : 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. 107..5.1.8.6 flight regularity messages shall comprise thefollowing..1 messages regarding the operation or maintenance of facilities essential for the safety or regularity of aircraft operation,..2 messages concerning the servicing of aircraft,..3 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 message,..4 messages concerning non routine landings to be made by the aircraft,..5 messages concerning aircraft parts and materials urgently required,..6 messages concerning changes in aircraft operating schedules...the message ' please call a taxi cab for us. we will arrive at 1045 ' is an unauthorized message. exemple 504 An unauthorized message.

Question 260-38 : The order of priority of the following messages in the aeronautical mobile service is ?

Flight safety message, meteorological message, flight regularity message.

Img115..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 inflight,.3 meteorological advice of immediate concern to an aircraft in flight or about to depart,.4 other messages concerning aircraft in flight or about to depart...meteorological messages shall comprise meteorological information to or from aircraft...flight regularity messages shall comprise the following.1 messages regarding the operation or maintenance of facilities essential for the safety or regularity of aircraft operation,.2 messages concerning the servicing of aircraft,.3 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 message,.4 messages concerning non routine landings to be made by the aircraft,.5 messages concerning aircraft parts and materials urgently required,.6 messages concerning changes in aircraft operating schedules. exemple 508 Flight safety message, meteorological message, flight regularity message.

Question 260-39 : The order of priority of the following messages in the aeronautical mobile service is ?

Distress message, urgency message, direction finding message.

Img115..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 inflight,.3 meteorological advice of immediate concern to an aircraft in flight or about to depart,.4 other messages concerning aircraft in flight or about to depart...meteorological messages shall comprise meteorological information to or from aircraft...flight regularity messages shall comprise the following.1 messages regarding the operation or maintenance of facilities essential for the safety or regularity of aircraft operation,.2 messages concerning the servicing of aircraft,.3 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 message,.4 messages concerning non routine landings to be made by the aircraft,.5 messages concerning aircraft parts and materials urgently required,.6 messages concerning changes in aircraft operating schedules. exemple 512 Distress message, urgency message, direction finding message.

Question 260-40 : The priority of the instruction taxi to runway 05 is ?

Same as line up runway 07 and wait.

Img115..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 inflight,.3 meteorological advice of immediate concern to an aircraft in flight or about to depart,.4 other messages concerning aircraft in flight or about to depart...meteorological messages shall comprise meteorological information to or from aircraft...flight regularity messages shall comprise the following.1 messages regarding the operation or maintenance of facilities essential for the safety or regularity of aircraft operation,.2 messages concerning the servicing of aircraft,.3 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 message,.4 messages concerning non routine landings to be made by the aircraft,.5 messages concerning aircraft parts and materials urgently required,.6 messages concerning changes in aircraft operating schedules.... taxi to runway 05 and line up runway 07 and wait are both flight safety messages. exemple 516 Same as “line-up runway 07 and wait”.


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