ATPL theory questions
Joined: May 1999
Posts: 1,846
Likes: 4
From: Bristol, England
magnetic bearing from aircraft to beacon is 247 + 70 = 317
true bearing aircraft to beacon is 317 -14 = 303
true bearing beacon to aircraft (still measured at the aircraft) is 303 -180 = 123
true bearing beacon to aircraft measured at the beacon is 123 +/- convergency
on a polar chart convergency is change of longitude, 17W - 9W = 8 degrees
a quick sketch shows it should be subtracted
true bearing to plot is 123 - 8 = 115 degrees.
true bearing aircraft to beacon is 317 -14 = 303
true bearing beacon to aircraft (still measured at the aircraft) is 303 -180 = 123
true bearing beacon to aircraft measured at the beacon is 123 +/- convergency
on a polar chart convergency is change of longitude, 17W - 9W = 8 degrees
a quick sketch shows it should be subtracted
true bearing to plot is 123 - 8 = 115 degrees.
Joined: Sep 2015
Posts: 48
Likes: 0
From: with my parents
another question...
Which of the following data, in addition to the Pseudo Random Noise (PRN) code, forms part of the so called Navigation Message transmitted by NAVSTAR/GPS satellites?
a)Time; data to impair the accuracy of the position fix (Selective Availability SA)
b)Almanac data; satellite status information
c)Data to correct receiver clock error; almanac data
d)Time; position of the satellites
answer given is B I wonder what is wrong with D? an excerpt from oxford ATPL says:-
The information contained in the nav and system data message is:
SV position
SV clock time
SV clock error
Information on ionospheric conditions
Supplementary information, including the almanac (orbital parameters for the SVs), SV
health (P-code only) correlation of GPS time with UTC and other command and control
functions.
so how does it not give time(or SV clock time)and position of sattelites(almanac) i.e. D?
Which of the following data, in addition to the Pseudo Random Noise (PRN) code, forms part of the so called Navigation Message transmitted by NAVSTAR/GPS satellites?
a)Time; data to impair the accuracy of the position fix (Selective Availability SA)
b)Almanac data; satellite status information
c)Data to correct receiver clock error; almanac data
d)Time; position of the satellites
answer given is B I wonder what is wrong with D? an excerpt from oxford ATPL says:-
The information contained in the nav and system data message is:
SV position
SV clock time
SV clock error
Information on ionospheric conditions
Supplementary information, including the almanac (orbital parameters for the SVs), SV
health (P-code only) correlation of GPS time with UTC and other command and control
functions.
so how does it not give time(or SV clock time)and position of sattelites(almanac) i.e. D?
Joined: Feb 2009
Posts: 5
Likes: 0
From: Athens, Greece
Engine failure in Traffic pattern with flaps down
I was wondering what would be the best course of action if engine failure occurred while in traffic pattern; keep the flaps or retract them? Could this response be aircraft-specific? Some people comment that flaps generate a lot of drag and should be removed, other state that the energy loss while transitioning from flaps to no flaps is more energy consuming and includes the risk of stalling. Any ideas? I would be grateful if someone had any reference (book, paper, website) to support their view. Many thanks
Joined: Apr 2012
Posts: 683
Likes: 0
From: In Space
Tsamotas
The answer to your question depends on what type/class of aircraft your flying. If its a single engine aircraft i would be aiming for the runway ASAP I would also take out the flap if if was a fair distance away. If i know I can glide to the runway i would leave the flap out. This is where Airmanship comes to play.
Multiengine aircraft are easier to deal with.
Multiengine aircraft are easier to deal with.
Joined: Dec 2015
Posts: 63
Likes: 0
From: London
Met Question
Can anyone pls explain this question pls?
In which approx direction does the centre of a non occluded frontal depression move?
The answer is in the direction of the warm sector isobars.
Not sure what it means by non occluded, is this a cold front?
Thanks
In which approx direction does the centre of a non occluded frontal depression move?
The answer is in the direction of the warm sector isobars.
Not sure what it means by non occluded, is this a cold front?
Thanks
Joined: Jan 2006
Posts: 408
Likes: 1
From: Europe
There's a special section for this type of questions - see link:
http://www.pprune.org/professional-p...stions-34.html
http://www.pprune.org/professional-p...stions-34.html
Tabs please!
Joined: Jun 2004
Aviation Qualifications: PPL
Posts: 1,200
Likes: 1,098
From: Biffins Bridge
A non occluded front is either a cold or warm front where the edge of the front reaches the ground.
The answer is that the system moves in the direction of the isobars in the warm sector i.e. behind a warm front or in front of a cold front.
The answer is that the system moves in the direction of the isobars in the warm sector i.e. behind a warm front or in front of a cold front.
Joined: Dec 2015
Posts: 63
Likes: 0
From: London
thanks
thanks fraser, in laymans terms, whats the best explanation of the Gradient wind, Pressure Gradient Wind, Geostrophic, Coriolis Force and CFF?
How many layers are there, surface? Friction, turbulence layer?
thanks again
How many layers are there, surface? Friction, turbulence layer?
thanks again
Joined: Nov 2000
Posts: 4,330
Likes: 74
From: White Waltham, Prestwick & Calgary
1.Air will try to flow in a straight line from high to low pressure.
2. It cannot do this because the Earth is spinning, so it veers to the right.
3. Centrifugal force kicks in with the result that, at 2000 feet, where there is no friction, the wind tends to follow the isobars.
4. Below 2000 feet, because the effect of centrifugal force reduces, the wind will back by about 30 degrees over land (20 over the sea) and about 10 knots by the time you get to the surface.
Simples.
Phil
2. It cannot do this because the Earth is spinning, so it veers to the right.
3. Centrifugal force kicks in with the result that, at 2000 feet, where there is no friction, the wind tends to follow the isobars.
4. Below 2000 feet, because the effect of centrifugal force reduces, the wind will back by about 30 degrees over land (20 over the sea) and about 10 knots by the time you get to the surface.
Simples.
Phil
Joined: Nov 2000
Posts: 4,330
Likes: 74
From: White Waltham, Prestwick & Calgary
You can always land with less than final reserve. The difference is that in Europe you must declare an emergency. That is, after all, what it is for. In other countries, as long as you take off with it, you can just use it.
phil
phil
Joined: Apr 2005
Posts: 351
Likes: 0
From: Dry bar
I think it ŵould be more correct to say that you can not plan to land with less than final reserve.
You can burn in to your alternate fuel providing that the airfield you are holding over passes an EAT. Subject to an assesment by the commander of various other factors included.
You can burn in to your alternate fuel providing that the airfield you are holding over passes an EAT. Subject to an assesment by the commander of various other factors included.