Dispatch question (ASA)

[Berry McCockner]

Exemption 3585 lets us be dispatched on a conditional statement that is below mins as long as the main body of the forcast is above mins (along with some other criteria)..
My ? is, can we be dispatched if the main body is below mins, but a conditional statement during your time of arrival is above mins..

Example: ATL 011212 09010 1/4SM -RABR
TEMPO 1417 1/2SM
FR 1700 6SM SKC

We are scheduled to arrive at 1515Z
Thanks, Berry

 

[outtahere]

Exemption 3585 lets us be dispatched on a conditional statement that is below mins as long as the main body of the forcast is above mins (along with some other criteria)..
My ? is, can we be dispatched if the main body is below mins, but a conditional statement during your time of arrival is above mins..

Example: ATL 011212 09010 1/4SM -RABR
TEMPO 1417 1/2SM
FR 1700 6SM SKC

We are scheduled to arrive at 1515Z
Thanks, Berry

CATII changed alot of the requirements, and you are probably legal with CATII. Exemption 3585 does not apply here though.

 

[SiuDude]

Exemption 3585 lets us be dispatched on a conditional statement that is below mins as long as the main body of the forcast is above mins (along with some other criteria)..
My ? is, can we be dispatched if the main body is below mins, but a conditional statement during your time of arrival is above mins..

Example: ATL 011212 09010 1/4SM -RABR
TEMPO 1417 1/2SM
FR 1700 6SM SKC

We are scheduled to arrive at 1515Z
Thanks, Berry

Absolutely.

 

[homerjdispatch]

Absolutely.

Not quite...


CAT II yes

CAT I NO!

The wx has to be at or above minimums in the main body.

 

[Blucher]

Exemption 3585 lets us be dispatched on a conditional statement that is below mins as long as the main body of the forcast is above mins (along with some other criteria)..
My ? is, can we be dispatched if the main body is below mins, but a conditional statement during your time of arrival is above mins..

Example: ATL 011212 09010 1/4SM -RABR
TEMPO 1417 1/2SM
FR 1700 6SM SKC

We are scheduled to arrive at 1515Z
Thanks, Berry

Berry,

I'm not sure which part of the statement "Main Body: must always be at or above minimums" you're not getting here. The whole point of 3585 is to basically be able to ignore any tempo's. Good luck.

-Blucher

 

[FmrFreightDog]

Homer J. is right. In your particular situation 3585 is irrelevant. If you were restricted to Cat I and the main body was 1/2 and the tempo was 1/4, then 3585 would be helpful. But, to use 3585, the main body always has to be above mins.

That does lead to a question though. Is 3858 only for Cat I operations? In other words, say you're good to go for Cat II and the main body at your ETA is 1/4 with a tempo of 1/8. Can 3585 be used to dispatch you in this situation, or is it a Cat I tool only?

 

[Berry McCockner]

I was just refrencing 3585 to highlight the fact that we need the main body to be at or above mins to use that loophole. Forget 3585, are we legal to dispatch (CAT I) based on that example?
To be dispatched for CAT II, wouldn't the RVR needed to be be listed listed in the TAF??

 

[homerjdispatch]

3585 applies to landing minimums regardless of those minimums. You can apply 3585 to a high minimum captain, or a cat II qualified plane and crew. Just remember, its applied to your minimums.

 

[homerjdispatch]

I was just refrencing 3585 to highlight the fact that we need the main body to be at or above mins to use that loophole. Forget 3585, are we legal to dispatch (CAT I) based on that example?
To be dispatched for CAT II, wouldn't the RVR needed to be be listed listed in the TAF??

Not sure where you are getting the RVR thing in a TAF....Never heard that one before. Not how we do it here.

No not legal to dispatch. If minimums are 1/2sm and you have 1/4sm in the fcst for time of arrival, even if there is a tempo calling better, you cannot legally launch.

 

[propsarebest]

I was just refrencing 3585 to highlight the fact that we need the main body to be at or above mins to use that loophole. Forget 3585, are we legal to dispatch (CAT I) based on that example?
To be dispatched for CAT II, wouldn't the RVR needed to be be listed listed in the TAF??

NOT legal for CAT I, legal for CAT II. You WILL NOT find RVR in a TAF, EVER. TAF is forecast WX conditions only, you can't forecast RVR.

What really gets confusing... Some international cities that we fly to report vis in meters in the METAR and TAF, but RVR is in feet.

 

[Berry McCockner]

OK, forget CAT II, are we legal CAT I for the example?

 

[propsarebest]

nope
because you need a min of 1/2 mile to start a cat I approach.

CAT I is never below 1/2 mile.

 

[homerjdispatch]

Props is correct....exactly what I sad too!!!

 

[Berry McCockner]

So we can't be dispatched based on a Tempo if we are CAT ! only??
If the main body says 1/4sm, we just assume that the equivalent is 1200rvr and we blast off? Assuming we are CAT II qualified.

 

[FmrFreightDog]

You can't ever be dispatched on a tempo. The only thing a tempo can really do is keep you from being dispatched. In other words, a tempo will never make you legal but it may make you illegal.

 

[Berry McCockner]

You can't ever be dispatched on a tempo. The only thing a tempo can really do is keep you from being dispatched. In other words, a tempo will never make you legal but it may make you illegal.

What about the second part of my question..
We just assume 1/4sm means that its 1200rvr and we go (if we are Cat II qualified)

 

[FmrFreightDog]

What about the second part of my question..
We just assume 1/4sm means that its 1200rvr and we go (if we are Cat II qualified)

As I understand it, yes. 1200 RVR is the equivalent of 1/4 mi, just like 2400 RVR is the equivalent of 1/2 mi. Say you're Cat I only and you see 1/2 mile in the forecast. You go, right? Because you're assuming that the forecasted 1/2 mile will equate to 2400 RVR or beter (or 1800 RVR on some approaches).

If the upshot of your question is, "Now that we're Cat II, can I take off when the forecast for my destination is 1/4 mi at the time of my arrival?" then the answer is yes. 1/8 mi... that's a different story.

 

[Berry McCockner]

Thanks, Berry

 

[Copydat]

So we can't be dispatched based on a Tempo if we are CAT ! only??
If the main body says 1/4sm, we just assume that the equivalent is 1200rvr and we blast off? Assuming we are CAT II qualified.

Never try to translate RVR into sm equivalent. They are not measured the same, nor can they be intermixed. If the approach plate lists an RVR requirement for the approach the facility will be able to report RVR's. Trying to convert RVR's to 1/4, 1/2 sm etc. will get you confused and walking down the wrong path.

 

[Copydat]

Also, as was mentioned earlier you would not blast off based on some RVR comparison as RVR is a value that is measured and not a "forecasted" value.

 

[FmrFreightDog]

Never try to translate RVR into sm equivalent. They are not measured the same, nor can they be intermixed. If the approach plate lists an RVR requirement for the approach the facility will be able to report RVR's. Trying to convert RVR's to 1/4, 1/2 sm etc. will get you confused and walking down the wrong path.

He wasn't really. He was basically just asking if you can legally depart to an airport forecasting 1/4 mi if you're Cat II. The answer is yes.

 

[goahead]

Great so can I get my sign off for RGT? That's all I ever get out of it.