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As I asked question about weather minimums yesterday, I've read some material including TERPs. And In the FAA 8260.3b, 'Taking and Landing Minimims' 3.1 there is one sentence "alternate minimims, when specified, must be stated as ceiling and visibility."

But I don't know What alternate minimums exactly means because I am not native English speaker. I have used English dictionary to find exact meaning but failed.

What is the difference between approach minimums and alternate minimums?

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FAR 91.169 states that IFR flight plans must include an alternate airport unless the weather is at least 2000 ft ceiling and 3 miles visibility, from one hour before to one hour afterwards (1-2-3 rule).

The same regulation also states that the alternate airport must meet the following critera:

(c) IFR alternate airport weather minima. Unless otherwise authorized by the Administrator, no person may include an alternate airport in an IFR flight plan unless appropriate weather reports or weather forecasts, or a combination of them, indicate that, at the estimated time of arrival at the alternate airport, the ceiling and visibility at that airport will be at or above the following weather minima:

(1) If an instrument approach procedure has been published in part 97 of this chapter, or a special instrument approach procedure has been issued by the Administrator to the operator, for that airport, the following minima:

(i) For aircraft other than helicopters: The alternate airport minima specified in that procedure, or if none are specified the following standard approach minima:

(A) For a precision approach procedure. Ceiling 600 feet and visibility 2 statute miles.

(B) For a non-precision approach procedure. Ceiling 800 feet and visibility 2 statute miles.

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  • $\begingroup$ So, Do you mean that 'alternate minimums' means alternative aiport's minimum? If yes, Does the word 'alternate' imply 'alternative airport'? $\endgroup$ – user12972 Jan 24 '16 at 22:35
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    $\begingroup$ Yes the forecast weather for the alternate airport must be above minimums. $\endgroup$ – rbp Jan 24 '16 at 23:04
  • $\begingroup$ More precisely, it must be well above minimums, and have an instrument approach. $\endgroup$ – Edward Falk Jan 24 '16 at 23:28
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    $\begingroup$ It doesn't have to be well above anything except what's written above. There are plenty of approaches that are 800/2. And since the alternate minimums are below basic VFR of course it has to have an instrument approach. $\endgroup$ – rbp Jan 25 '16 at 0:08
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    $\begingroup$ Also, some procedures aren't eligible for use as an alternate approach. $\endgroup$ – UnrecognizedFallingObject Jan 25 '16 at 0:11
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I found an excellent article about it at IFR Magazine.

Basically, to qualify as an alternate airport, the alternate must have certain forecast weather conditions (600-2 for precision approach, 800-2 for non-precision.) These are the "alternate minimums".

However, those are just the default values. Many airports have different values, in which case the alternate minimums will be published on the approach plate (example: PAO VOR approach, top-left, next to the inverted 'A')

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