What is the transport wander of an uncorrected gyro?

A bit of googling would have given you a satisfactory answer:
When Flying....What is "Transport Wander" of an Uncorrected Gyro? - Yahoo! Answers (http://answers.yahoo.com/question/index?qid=20070623043421AAkT72H)

"An uncorrected gyro maintains its position with respect to his initial frame of reference. If this gyro is moved over the earth, an apparent drift arises as the gyro still maintains its alignment with its initial frame of reference while the gyro's carrier might have moved several degrees along the earth. For example, the gyro would appear to be aligned 90 degrees off the original position if you travel along a great circle and cover 1/4th the circumference of the earth (not considering the apparent drift due to the rotation of the earth). This apparent drift is called transport wander."

A number of wannabes have fallen flat on their faces when asked this question at CX's CPP tech interview. Would anyone care to know more (questions) ?

Thanks. I did get that question from a website with CX tech questions.

I could be quite wrong on this but I seem to remember something about this wander in my private pilot studies. Something along the line of a stationary gyro(spinning but staying at the same location) having a 15° error per hour at the poles and no error at the equator. Therefore some sort of mathematical formula could be used using the sine of the latitude multiplied by perhaps the distance traveled. I'm not sure.

I don't have a Cathay interview but I suppose some of their questions I wouldn't mind having the answers to.

Were they expecting a mathematical formula for the answer to this question?

Nothing mathematical at all, just "How does a DG work ?" kind of thing, but you'd be falling out of your chair listening to the responses / silence from some PPL/CPL candidates ! :ugh:

may i know where is the website u get for the CX tech question?

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Must...inject...Monty Python...quote...

- "What is the airspeed velocity of an unladen swallow?"
- "What do you mean, African or European swallow?"
- "Uh, I, I don't know that... wheeeee...."

How a DG works is a basic question here in the states just to get your PPL from the FAA examiner.

Transport wander: (gndspeed/60) tan (lat) (assuming an easterly or westerly track, otherwise use the component of ground speed that is on an easterly or westerly track)

Northern Hemisphere: Eastbound = decreasing
Westbound = increasing
Southern Hemisphere: vice versa

Just to add to the Transport Wander answer.
Transport Wander exists because of earth revolution around the Sun. The "initial fame of reference"is alligned to a point on earth and one point in space. when this allignmnet wrt a point in space shifts due to earth revolution around the sun, is called as transport wander.

Sortof, but you're a little backwards. The gyro stays aligned to the point in space that you are referring to. The wander is a result of the earth not staying in the same place and orientation in space.