CATS (Luton) formerly: Cranfield (CATS)
Joined: Jan 2008
Posts: 47
Likes: 0
From: Latvia
Questions
May be somebody can help. I have a question:
If you are landing on aerodrome, where you can expect very cold weather(approx -20 degrees by celsius), what calculations and corrections you have to do? I think, I have to calculate current density altitude.
If you are landing on aerodrome, where you can expect very cold weather(approx -20 degrees by celsius), what calculations and corrections you have to do? I think, I have to calculate current density altitude.
Joined: Apr 2008
Posts: 64
Likes: 0
From: London
CATS online
Not sure if this will work:
3.4.1 Density altitudeWith the initial data from ISA you can define a density which corresponds to the density at sea level, - density altitude 0ft. Now suppose that the actual air pressure decreases and/or the temperature increases. The result will be that density decreases. The new value of density corresponds to a higher altitude in the standard case (i.e. in ISA) and we refer to this as a higher density altitude.Decreasing density implies higher density altitude
Increasing density implies lower density altitudeOn a warm summer day an airport at sea level can have the same density altitude as that of an airport at an higher altitude at normal temperature.Density altitude is the altitude in the standard atmosphere where the density has the same value as the one that actually prevails around the aircraftA 1°C change in the ISA temperature will modify the density altitude by 120'.
Figure 3.3
Density altitude changes by 120 feet per 1oC deviation from ISA at the actual levelProblems arise at extremely high-density altitudes, since much of the performance characteristics of an aeroplane depend on the dynamic pressure of the air. This in turn is a function of 1/2 ρV2. The lower density will give less lift to the wing. The thrust decreases since the engines consume less air (density = kg / m3). A propeller gets less grip in the thinner air. The effects of the thinner air on the airspeed indicator are not apparent since the aircraft behaves as it should, i.e. it takes off at the normal indicated speed etc. But the actual speed relative to the air (true airspeed) must increase when density decreases to give the same indicated airspeed. The result is that a higher density altitude extends the take-off run and gives a more shallow climbing profile. It will also require an extension of the landing run as the true landing speed will be higher in order to give the same IAS.
3.4.1 Density altitudeWith the initial data from ISA you can define a density which corresponds to the density at sea level, - density altitude 0ft. Now suppose that the actual air pressure decreases and/or the temperature increases. The result will be that density decreases. The new value of density corresponds to a higher altitude in the standard case (i.e. in ISA) and we refer to this as a higher density altitude.Decreasing density implies higher density altitude
Increasing density implies lower density altitudeOn a warm summer day an airport at sea level can have the same density altitude as that of an airport at an higher altitude at normal temperature.Density altitude is the altitude in the standard atmosphere where the density has the same value as the one that actually prevails around the aircraftA 1°C change in the ISA temperature will modify the density altitude by 120'.
Figure 3.3
Density altitude changes by 120 feet per 1oC deviation from ISA at the actual levelProblems arise at extremely high-density altitudes, since much of the performance characteristics of an aeroplane depend on the dynamic pressure of the air. This in turn is a function of 1/2 ρV2. The lower density will give less lift to the wing. The thrust decreases since the engines consume less air (density = kg / m3). A propeller gets less grip in the thinner air. The effects of the thinner air on the airspeed indicator are not apparent since the aircraft behaves as it should, i.e. it takes off at the normal indicated speed etc. But the actual speed relative to the air (true airspeed) must increase when density decreases to give the same indicated airspeed. The result is that a higher density altitude extends the take-off run and gives a more shallow climbing profile. It will also require an extension of the landing run as the true landing speed will be higher in order to give the same IAS.
Joined: Aug 2007
Aviation Qualifications: PPL
Posts: 96
Likes: 0
From: United Kingdom
Question about CATS online question bank
Just wondering, what is the so called "question bank"
On the CATS online course, I just had a look on the Demo and was wondering?!?!?!
Could anyone please clarify is the QB "quick questions" or????????
Or when you actually take out the online course does it say "Question Bank"
Thanks
On the CATS online course, I just had a look on the Demo and was wondering?!?!?!
Could anyone please clarify is the QB "quick questions" or????????
Or when you actually take out the online course does it say "Question Bank"
Thanks
Joined: Dec 2007
Posts: 1
Likes: 0
From: stevenage
I'm booked in for the september groundschool, still got about 15 hours of my ppl to finish off before that - hoping for a run of good weather!
I'm going to be staying at wood farm which they reccomended, anyone stayed / staying there?
I'm going to be staying at wood farm which they reccomended, anyone stayed / staying there?
Joined: Aug 2000
Posts: 1,966
Likes: 0
From: Norfolk
I have been a distance learning CATS stude.
On the positive side, it took me 6 months to pass all the exams, all results in the 90's, two re-sits which were fundamentally my poor preparation - so no probs with either the coursework or groundschool.
Would I recommend them. Definitely NOT.
Shambolic, hap-hazard, very hard to communicate with and I continually felt that I was not a customer but an inconvenience. I disliked the HOT's sneering supercilliousness intensely and was annoyed that he spent so much time teaching us by rote, subjects that admittedly were on the syllabus, have never appeared as exam questions.
At LGW, I met other studes, who seemed better prepared by their respective schools - Bournemouth & Bristol.
I'm not bitter, I paid £999 and I've passed. I do know that the experience could have been more enjoyable had I been treated like an adult - and even over 40, I was amongst the youngest on my ground school days!!
Stik
On the positive side, it took me 6 months to pass all the exams, all results in the 90's, two re-sits which were fundamentally my poor preparation - so no probs with either the coursework or groundschool.
Would I recommend them. Definitely NOT.
Shambolic, hap-hazard, very hard to communicate with and I continually felt that I was not a customer but an inconvenience. I disliked the HOT's sneering supercilliousness intensely and was annoyed that he spent so much time teaching us by rote, subjects that admittedly were on the syllabus, have never appeared as exam questions.
At LGW, I met other studes, who seemed better prepared by their respective schools - Bournemouth & Bristol.
I'm not bitter, I paid £999 and I've passed. I do know that the experience could have been more enjoyable had I been treated like an adult - and even over 40, I was amongst the youngest on my ground school days!!
Stik
Joined: Apr 2008
Posts: 64
Likes: 0
From: London
CATS Online Overview Lectures
the Overview lecture bit is a new section of the web based training and they have only loaded up stage 2 to this date
You cannot even find it on the HPL demo since HPL is a Stage 1 subject
Ive been told the rest are coming soon.....
You cannot even find it on the HPL demo since HPL is a Stage 1 subject
Ive been told the rest are coming soon.....
Joined: Nov 2008
Posts: 41
Likes: 0
From: Luton, UK
CATS Video Team
Hi irishpost,
Just to let you know we've updated the Overview Lectures. We're constantly releasing more and they're now all compatible with Flash Player 10.
Like to keep things fresh.
Regards,
CATS Support
Just to let you know we've updated the Overview Lectures. We're constantly releasing more and they're now all compatible with Flash Player 10.
Like to keep things fresh.
Regards,
CATS Support