#### Archived

This topic is now archived and is closed to further replies.

# Runway Slope

## Recommended Posts

How do one finds the runway slope and how is it entered into the FMC?

Thanks

##### Share on other sites
 Help AVSIM continue to serve you!Please donate today!

How do one finds the runway slope and how is it entered into the FMC?

Thanks

Good question, only x-plane has real sloped runways. FSX no, unless the scenerist decide to draw into the scenery. FSX world is flat.

There must be a dedicated slot into INIT PERF page (with DN/UP) where to insert the value, but it's pure fictional. it's a shame because sloped runways add very realism to the sim.

##### Share on other sites

How do one finds the runway slope and how is it entered into the FMC?

Thanks

Depends on the area of the world, but you'll find them on the airport charts for the airport (specifically the taxiway diagrams).  Here in the States, you can also have a look at AirNav.com.

##### Share on other sites

Back during the classroom days, we were taught a simple rule of thumb for this kind of stuff, one of which was the runway slope.

You pick the runway you're planning on departing from, subtract the lower end elevation of the runway from the higher end elevation, divide that number with the runway length (making sure the SI unit is the same for all calculations) and multiply it by a 100 to get your answer in %.

Depending on which side you're rolling to at take off thrust, you'd know if it's uphill or downhill.

I'm assuming the T7 CDU has allowance for a single digit before and after the decimal point with the letter 'D' or 'U' entered with the number (downslope and ups, respectively).

##### Share on other sites

Krazyk,

Thanks for the information.

If I understand you correctly, in looking at KSFO airport diagram:

If I were to pick departure runway 10R, I would do the following?

Elevation at RNWY 10R is 6 and opposite end which is RNWY 28L at elevation of 13

Subtract 13-6=7

Divide 7 by RNWY length of 10,602 = .0006602

Mulitply .0006602 X 100 = 0.066%

So I would enter in FMC of the T7 for runway slope: U0.7/Dry (Wet).

I think I understand it correctly.

Thanks everyone

##### Share on other sites

I would do the following?

Yep, that's right. Although for such small differences, I'd usually just leave it at 0 but yes if you'd like to be accurate then that's exactly what you would do. Just be sure to match the SI units (mtrs to mtrs and feet to feet) (:

Glad I could help. Happy flying!

##### Share on other sites

U0.7/Dry

0.066 rounds up to 0.1, not 0.7.

##### Share on other sites

• Tom Allensworth,
Founder of AVSIM Online

• ### Hot Spots

• Flight Simulation's Premier Resource!

AVSIM is a free service to the flight simulation community. AVSIM is staffed completely by volunteers and all funds donated to AVSIM go directly back to supporting the community. Your donation here helps to pay our bandwidth costs, emergency funding, and other general costs that crop up from time to time. Thank you for your support!