what are the rules for a departure alternate?

[superfreight208]

(example: taking off from CVG below mins, is Dayton a good T/O alternate?)[font=&quot] [/font][font=&quot]
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[minitour]

One hour in still air. (135.217)

If it meets that......and you can land there.

-mini

 

[superfreight208]

thanks

 

[minitour]

thanks

Not a problem

-mini

 

[Singlecoil]

One hour in still air. (135.217)

If it meets that......and you can land there.

-mini

on one engine.

 

[minitour]

on one engine.

Doesn't say that here:
§ 135.217 IFR: Takeoff limitations.

No person may takeoff an aircraft under IFR from an airport where weather conditions are at or above takeoff minimums but are below authorized IFR landing minimums unless there is an alternate airport within 1 hour's flying time (at normal cruising speed, in still air) of the airport of departure.


-mini

 

[vclean]

§ 121.617 Alternate airport for departure.

(a) If the weather conditions at the airport of takeoff are below the landing minimums in the certificate holder's operations specifications for that airport, no person may dispatch or release an aircraft from that airport unless the dispatch or flight release specifies an alternate airport located within the following distances from the airport of takeoff:

(1) Aircraft having two engines. Not more than one hour from the departure airport at normal cruising speed in still air with one engine inoperative.

(2) Aircraft having three or more engines. Not more than two hours from the departure airport at normal cruising speed in still air with one engine inoperative.

(b) For the purpose of paragraph (a) of this section, the alternate airport weather conditions must meet the requirements of the certificate holder's operations specifications.

(c) No person may dispatch or release an aircraft from an airport unless he lists each required alternate airport in the dispatch or flight release.

​

 

[minitour]

oops....I've got to start reading that 121 stuff.....my bad

-mini

 

[Lead Sled]

Huh???

Superfreight208...
You didn't give us enough info. The answer really depends upon what set of regulations you're operating under - 91, 135, or 121. One size does not fit all.

'Sled

 

[superfreight208]

looks like one size does fit all!!

Got both the answers I needed...