Jump to content
Sign in to follow this  
pilot5

Question Of The Day!

Recommended Posts

To answer INS questions you must first understand the actual operation of an Inertial Reference Platform:

First, an airplane knows where it is at all times. It knows this because it knows where it isn't.

By subtracting where it is from where it is not, or where it isn't from where it is (whichever is greater), the

aircraft obtains a difference or deviation. The inertial navigation system uses deviation to generate

corrective commands to drive the aircraft from a position where it is to a position where it isn't. Arriving at

the position where it wasn't, it now is.

Consequently, the position where it wasn't is now the position where it is, and it follows that the position

where it was is now not the position where it isn't. In the event that the position where it is now is not the

position where it wasn't, the system has acquired a variation. Variations are external factors and are beyond

the scope of this discussion

In simple terms, the variation is the difference between where the aircraft is and where it isn't. If variation is

considered a significant factor, it may be corrected by the use of the Doppler system, however for this to

work, the aircraft must also know where it was.

The "thought process" of the system is as follows:

Because a variation has modified some of the information, which the aircraft has obtained, it is not sure

where it is. However, it is sure where it isn't (within reason...) and it knows where it was. It now subtracts

where it should be from where it wasn't (or vice versa...) and by differentiating this from the algebraic

difference between it's deviation and it's variation (which is called error), it computes the correct

information to compensate for all factors, thus supplying accurate navigation information.

In even simpler terms, the aircraft calculates the difference between where it is, where it was, at least two

places where it isn't, and where it should be to determine the path to get where it wants to be.

 

Spoken like a true E guy! Up until now, I thought Avionics was magic. I may have finally got it ;)

Share this post


Link to post
Share on other sites

1.When an inertial platform system is operating on board an aircraft, it is necessary to use a device with the following characteristics, in order to keep the vertical line with a pendulous system:

 

Without giving the game away, bear in mind that JAA questions require attention to detail - i.e they play mind games. Every word is important! There's usually an obvious answer that is not correct!

 

 

 

I'm currently doing a book of pilot puzzles - would you guys like to try some? :)

 

phil

Share this post


Link to post
Share on other sites
I'm currently doing a book of pilot puzzles - would you guys like to try some? :)

 

phil

 

Yes please! :up:

Share this post


Link to post
Share on other sites

Interial Navigation systems operate as was aptly explianed. The pilot enters a reference latitude.

 

The answer to the question is A, with damping and a period of 84 minutes

 

 

 

24. For an aircraft on ground what signal may be used by ATC to mean; return to starting point on the aerodrome?

 

a. continuous green light

b. flashes of green light

c. continuous white light

d. flashes of white light

 

25. You are landing at an aerodrome where landings are not confined to a runway. One aeroplane has already landed.

 

a. you will land immediately behind the other aeroplane.

b. when landing you will leave the other aeroplane clear on your right.

c. when landing you will leave the other aeroplane clear on your left.

 

 

Choose the correct answer.

 

Share this post


Link to post
Share on other sites

Actually, I believe the answer should be with damping and the period is about 84 minutes - 84 minutes being the Schuler tuning. Which database are you using?

 

Here's a good example of a JAA question.

 

The flux valve of a gyro magnetic compass:

 

a) is pendulously mounted and remains aligned with the earth magnetic field.

 

B) is fixed to ans turns with the aircraft to create a field which is used to measure the angle between the aircraft and the earth magnetic flux lines.

 

c) is not subject to turning and acceleration error.

 

d) is pendulously suspended and is not affected by the vertical component of the earth magnetic field.

 

They very often require the least wrong answer!

 

Others follow!

 

phil

Share this post


Link to post
Share on other sites

Not sure what data base? but about seems like the right answer. But according to my answer sheet its 84minutes. Hmmmm. It could bee out by .001% and therefor about is a better answer.

 

Thought I'd pick a few easier ones.

 

These questions are for the most part designed to cause a bad wrong answer and the language is sooooo important.

 

Cheers P5

Share this post


Link to post
Share on other sites
24. For an aircraft on ground what signal may be used by ATC to mean; return to starting point on the aerodrome?

 

a. continuous green light

b. flashes of green light

c. continuous white light

d. flashes of white light

 

That's (d.). I've only had one PPC (so far) but the light signals was one of the questions, IIRC.

 

I'm fuzzy on the runway one - I better go learn (or remind myself) the answer as it looks to be a good one to know. Helicopters are often not confined to runways, after all... :)

 

Cheers,

 

- Darren

 

 

Share this post


Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Loading...
Sign in to follow this  

×
×
  • Create New...