GRID MORA's???

[General Mutley]

i am trying to find out what GRID MORA's are in flight planning. I can find route MORA in the jeppesen enroute chart legend but cannot find reference to GRID MORA.
Any ideas???

[RichardH]

The GRID Mora on the Jeppesen charts applies to a square of Lat & Long.
If you look on E(LO)2 just left of Berry Head (N50:23 W003:29) you shall find the numbers 32. This indicates within the block from N50 to N51 and W003 to W004 the Grid Mora is 3200 ft amsl. It includes a safety factor.

In the introduction legend have a look at Page 57 the vast majority of Jeppesen chart questions can be answered from this page.

R.

[General Mutley]

Ahah - i see where they got the answer from now - Thanks Richard.thanks for all your advice - much appreciated :ok:

[downwind24]

Good old page 57 :ok:

[Grasscarp]

MORA stands for minimum off route altitude. It extends to ten nautical miles either side of the airways centreline. It takes the highest elevation/structure within the one degree area and adds on a buffer of 1000 feet. Above 5000 feet it adds on a buffer of 2000 feet. If you see a plus and minus sign alongside the grid mora it means that the figure may not be accurate.

[Kylie777]

The question was about Grid Mora.

As I understand it and was taught grid mora is a jeppesn derived term and refers to the grids on the charts. There is a full definition (which everybody should read in book 1 of the jep manuals. (Full set not the student handout)

Grasscarp. You seem to be getting confused between en route Mora and grid mora.

[liabith]

why grids moras above 14000 ft are maroon in color and below 14oooft are green in color

[greekboy]

Hi Liabith

I might be wrong but i think its to do with emergency decents. time of useful conciousness above and below 14000 feet. etc

i will check my mcc notes to make sure.

[Poose]

On your charts the large numbers - one large and one small in the middle of a Grid Square are your Grid Minimum Off Route Altitude.

This value is the tallest obstruction in the grid square rounded up to the nearest hundred feet. There should be a thorough definition in the front of your Jeppesen and a page at the back of the glossary naming all of the symbols. The Grid MORA should be on that page, too. :ok:

[varunjamwal]

itz mainly related to the unpressurised aircraft below 14,000ft and pressurised aircraft above 14,000ft.that means marron means supplimentry supply of oxygen is required above 14,000ft.