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Old 11-25-2009, 08:30 PM
  #1  
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Default Dumb Traffic Pattern Question

My roommate and I (both CFIs) were discussing this the other day at work about entering the pattern at our home airport..Most of the time when returning we are instructed to enter and report a 2 mile right/left base for runway X.

I have always assumed that it means the base leg will be 2 miles from the runway..or, a 2 mile final when the time comes..my roommate seems to think you would report when on base, and 2 miles from turning final...

Any words of wisdom out there so I can hopefully tell my roommate he's wrong :)
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Old 11-25-2009, 08:54 PM
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Default You're right

In my business, a 10-mile base-leg means the base leg is 10 miles from the threshold. Pretend it is an arc around the runway and distance-to-touchdown never changes.
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Old 11-26-2009, 05:44 AM
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What tower wants is for you to ENTER a base leg for a two-mile final, and report when on the base leg.

If you are straight in to the base, don't report it 12 miles out, report it when you within the normal traffic pattern base leg distance (maybe a mile or so from final). The whole point of this is that the tower wants to know when and where to look for you, and wants you close enough to acquire visually.
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Old 12-01-2009, 07:33 AM
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The point to reporting a 2 (or 9 or 10) mile base leg to the tower is so the controller can find you and make a decision to clear you to land or do something else (360, turn onto an extended downwind, whatever).

Imagine you're in the pattern, and the tower tells you to extend your downwind 2 miles. When you turn base, then, you're on a 2 mile base and that's what the tower is looking for if you're entering the pattern on a 2 mile base leg.

Virtually all towers have some sort of radar display (there are a handful that don't), so the tower generally knows where you are and can set a sequence based on the radar screen instead of just strictly position reports from pilots.
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Old 12-01-2009, 07:38 AM
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It depends on the controller, but I normally take it to mean report when on a left/right base, two miles from the threshold.

IOW if instructed, "report a 2 mile left base, runway 27," I would report right base approximately 2 miles from the threshold.
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