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About engine thrust reverser and effect of rain water on jet engines
Written by Capt Lim   
Tuesday, 20 January 2015 10:00
 
Jet Engine Thrust Reverser

Dear Captain Lim

My question is about thrust reversers - I am a light aircraft and glider pilot in the UK and I understand that when the thrust reversers are deployed on modern engines, the flaps cut off the direction of the air in the engine, the cowl opens and the air flow is directed forward.

Now when a commercial aircraft is landing, conventional wisdom dictates the engines should be at idle in the flare or very soon after touchdown. If this is the case, the fan blades will be wind-milling and not generating thrust, so why a need for reversers. The only reason I can think of when they must use them is, where engine power is above idle?

Does this mean that the engines are kept above idle in the flare so benefit of reversal can be achieved when the aircraft lands.

My final question - Why the rain water in the air doesn’t extinguish the combustion of a jet engine? Is it because the engine is too hot?

Many thanks

Regards

Simon

 
Does an airplane fly 3 degrees upwards or downwards during the cruise?
Written by Capt Lim   
Tuesday, 30 December 2014 17:03
 
Angle of Attack and you

Hi Captain Lim

I have just finished reading a book about flying that I bought on a trip to Taiwan. From the book I know that an aircraft is flying at around 3 degrees when cruising in the air. I also know that the table on the passenger's seat is also designed to be at 3 degrees.

I have a question. Is the aircraft flying upwards at 3 degrees or downwards at 3 degrees? And if it flies upwards at 3 degrees, will it climb to a higher level? Flying from an opposite direction, would it descend at 3 degrees towards the ground?

Thank you for your answer.

Amelia

 
Fly-by-wire Boeing and Airbus – Are their flying philosophy different?
Written by Capt Lim   
Saturday, 20 December 2014 14:10

Flying the Fly-By-Wire A320

Hello Sir!

I've been recently told that the Boeing 777/787 FBW philosophy differs from Airbus only in 1 thing:-

The Boeing 777 will not override pilots input on the column (it will give you sirens, EICAS messages and stick shakers but you are ultimate decision maker)

On the Airbus you have to push the button in order to turn Flight Envelope off and control in the direct mode (Boeing seem to believe that reaction has to be uninterrupted by button switching)

As far as taking flight path, calculating the desired input on the flight controls (decision how smooth pull it horizontally or vertically) or in case of emergencies (i.e. if left flaperon fails, flight controls will work to minimize the asymmetry effect without change in the column input)

Boeing relies on FBW as much as Airbus does.

James
 
How pilots remember and repeat the ATC instructions?
Written by Capt Lim   
Thursday, 11 December 2014 15:16

Live ATC - Rude Air Traffic Controller

Hi Captain Lim,

Thanks for your wonderful and resourceful website. I am curious as to how you guys remember and repeat all the ATC instructions within a few seconds. I listen to ATC channels sometimes, and it could be a bit tough.

"Qantas 001, information is now Echo, altimeter 1008. Turn left to 270, direct to (some waypoint), decent to FL370, expect a 3 minute left hand pattern at ___, expect BORRY2 arrival for runway 24L".

And if they are mean enough, they sometimes say all of that in one transmission plus radio frequency change.

I have heard some pilots write it down, while some pilots just know it because they fly that route quite a few times. But how often do you see pilots actually writing the stuffs down?

As a First Officer or Captain, it might be a bit embarrassing.

Thanks for your time

Martin
 
Fear of Flying – Causes and Tips
Written by Capt Lim   
Tuesday, 25 November 2014 10:56

Overcoming Fear of Flying with SOAR

Good Afternoon Capt Lim,

I have a fear of flying and plan to take anxiety pills to help with the flights.

Do you have any suggestions I should do before the flight(s)? It isn't until the 7th and 8th of Dec.

I have been looking at pictures and trying to get as much information about each plane. I am hoping you would have some more information I could take into consideration.

My husband is flying with me, he is does not have the same fear. I have been on air planes before, but every time, I had to take something to calm me down.

Do you have anything for me to take or something I can do to help me?

Thank you so much

Christine
 
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