Also, what are the regs for leaving your ORIGIN and the DEST weather is below minimums for that airport? Could you still takeoff?

You can still takeoff IF the forecasted weather (TAF) for your ETA is above minimums and you fill a second alternate airport. This varies country to country's regulations.

i guys. Just to clarify the 2.5%, 3.5% etc is the MACG (Missed Approach Climb Gradient)

 

Unless otherwise stated the aerodromes operating minima is based on a 2.5% missed approach climb gradient. Occasionally when terrain in the missed approach area is critical a lower landing minima can be selected based on a higher than normal missed approach climb gradient.

 

If we want to verify that we can fly a MACG greater than 2.5% we have to take into account it needs to be flown in the one-engine inoperative missed approach configuration (One engine, TOGA thrust, Gear up, F15)

 

In reality we don't have the time to work this out and I can't remember how to! Ops Performance manual thankfully has a table in the preamble which verifies if you can fly a missed approach greater than 2.5% based on pressure altitude of your destination and OAT.

 

 

Brilliant chart and info there thankyou! I found this to help me understand MACG http://www.pprune.org/archive/index.php/t-445232.html

You can also try to use the ND. Just use the smallest scale on the ND and turn when abeam the Rwy threshold just like what it is on the chart.

 

It should work nicely assuming you have an accurate position from the FM.

 

If you want a super accurate position just use google earth to work out the coordinate and use the fix page to display the waypoint there. That would work too.

 

Thanks for the tip !!!

Driver170, on 20 Dec 2014 - 4:23 PM, said:

Also, what are the regs for leaving your ORIGIN and the DEST weather is below minimums for that airport? Could you still takeoff?

 

You can still takeoff IF the forecasted weather (TAF) for your ETA is above minimums and you fill a second alternate airport. This varies country to country's regulations.

 

 

Just read JAR OPS 1 and done a little search!

 

 

If you are flying to airport A and it is below minima, you need two alternates which must be above planning minima.