Having looked through the questions, I have four last doubts:
Q56) With all engines out, a pilot wants to fly for maximum
time. Therefore he has to fly the speed corresponding to:
A) the minimum drag. (Mark scheme answer)
B) the critical Mach number.
C) the minimum angle of descent.
D) the maximum lift.
->If the actual speed we're looking for is that corresponding to minimum power required, isn't it true that due to the shapes of the graphs, the speed that gives minimum angle of descent is practically the same as the speed giving maximum rate of climb (statement from my book), which in turn correponds to minimum power required?
307) Other factors remaining constant, how does increasing
altitude affect Vx and Vy:
A) Vx will decrease and Vy will increase.
B) Both will increase. (Mark scheme answer)
C) Both will remain the same.
D) Both will decrease.
For jets aircraft
EAS Vx is constant Vy decreases.
IAS and CAS Vx increase slightly while Vy decreases.
TAS Vx and Vy both increase.
->How would the speed of Vx and Vy vary if it was for a propeller driven aircraft?
242) For a turbojet aeroplane, what is the maximum landing
distance for wet runways when the landing distance
available at an aerodrome is 3000 m?
A) 2 070 m.
B) 1565 m. (Mark scheme answer)
C) 1800 m.
D) 2609 m.
->My workings: 60% of 3000= 1800m * 1.15% (as it's wet) = 2070m
You must remember that you must defactorise distance available or factorise distances used.
In this case we have
LDA = 3000m
Divide by 1.67 for regulatory factor (this is 1/0.7)
Then divide by 1.15 for wet surface.
This gives 1562m
Your mistake was in multiplying by 1.15 instead of dividing.
->I still don't understand why the maximum landing distance is less for a wet runway than for a dry runway. In JAR-OPS it states it must increase 15%. So if, in dry conditions, the aircraft has to stop in 60% of the runway, it would be 1800m. If it's wet it has to stop in 1565m?
Q349)A jet aeroplane is flying long range cruise. How does the
specific range / fuel flow change?
A) Decrease / decrease.
B) Increase / decrease. (Mark scheme answer)
C) Increase / increase.
D) Decrease / increase.
->Is this answer incorrect? I would go for D.
Thanks.