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Refer to figure.
You are about to enter an NDB holding pattern from sector 3. When first passing overhead the NDB, what will happen to the ADF needle?

  • A

    It will initially indicate TO, then once you pass the NDB it will indicate FROM.

  • B

    It will initially indicate FROM, then once you pass the NDB it will indicate TO.

  • C

    It will start pointing down and turn 180º upon passing the NDB.

  • D

    It will start pointing up and turn 180º upon passing the NDB.

This is much more simple than it initially looks. As all hold entries start by passing directly over the beacon, that means we just have to be able to describe what happens to the ADF needle when we fly over an NDB.

An ADF (Automatic Direction Finder) is the receiver and cockpit indicator of the NDB signal, and simply indicates in which direction the NDB is from our current heading, so the needle showing dead ahead means we are pointing at the NDB, and directly behind means we are pointing away from the NDB.

Therefore when we fly are about fly overhead an NDB, the needle starts by pointing forwards (upwards on the panel in front of us) and turns 180º to point directly behind us as soon as we go above the NDB.

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