Jump to content
Sign in to follow this  
Guest

MD-11 CRZ LEVELS in INIT page

Recommended Posts

Guest

I somehow can't figure out what's the use of entering more than one alt in the CRZ LEVELS entry on the INIT page. I tried to fly a real life plan for the first time today (EGSS-LFPG: N0455F170 LYD G27 WAFFU/N0490F230 M605 XIDIL UM605 DP) and entered 170/230 into that part of the INIT page, but the plane only noticed that FL170 and stayed there all the time... So... what's the use of adding more FL levels...? The FMS manual didn't help me...

Share this post


Link to post
Share on other sites

That is a pretty short trip. Multiple levels are handy for long flights where step climbs are used to improve economics.


Dan Downs KCRP

Share this post


Link to post
Share on other sites
Guest

I like them short. ;) It's a FedEx trip: I installed the FedEx livery and started to fly those real life trips: big fun!But you didn't answer the question (at least know that I am aware... :( ) Suppose this WAS a long trip and I entered 170/230: what's the use of entering 230 when the plane only seems to follow the first level? How does the plane know when to go to the next level...? Should I enter all levels into the plan manually? If so, what's the use of entering them here? I probably am overlooking something obvious...

Share this post


Link to post
Share on other sites

The distance is the point. It would climb to FL230 if there were an advantage.


Dan Downs KCRP

Share this post


Link to post
Share on other sites
I like them short. ;)But you didn't answer the question (at least know that I am aware... :( ) Suppose this WAS a long trip and I entered 170/230: what's the use of entering 230 when the plane only seems to follow the first level? How does the plane know when to go to the next level...? Should I enter all levels into the plan manually? If so, what's the use of entering them here? I probably am overlooking something obvious...
Jeroen,The levels you enter here on a short flight look more like FL restrictions on the airway. You better enter them on the FlightPlan pages as 170 or below and 230 or above.As Dan states, the sequence of levels entered on the init page are to improve economics. So start at least near an Optimum level, and enter next requested optimum levels in sequence, so the FMS can predict the optimum S/C points.The steps to make depend on the airspace structure, allowing 1000, 2000 or 4000 ft steps.Hope this clears it a bit.Regards,Harry

Share this post


Link to post
Share on other sites

The distance is the point. It would climb to FL230 if there were an advantage.


Dan Downs KCRP

Share this post


Link to post
Share on other sites
I like them short. ;)But you didn't answer the question (at least know that I am aware... :( ) Suppose this WAS a long trip and I entered 170/230: what's the use of entering 230 when the plane only seems to follow the first level? How does the plane know when to go to the next level...? Should I enter all levels into the plan manually? If so, what's the use of entering them here? I probably am overlooking something obvious...
On longer flights airliners perform so called step climbs, to get to a higher altitude as they get lighter. This is done to burn less fuel and thus increase range and save money.What you are doing by entering multiple flight levels, is to let the FMC know how big you want the "steps" to be. On Boeing aircraft you can enter a "step climb size", which will essentially do the same. Now if you enter flight levels that are for instance 2000 feet apart (330, 350, 370, 390) the FMC will calculate optimum points of climb for you. When you approach a step climb you still have to manually adjust the altitude on the MCP (AFS on the 11?). This is to prevent the aircraft to climb automatically without clearance from ATC.RegardsAlex

Share this post


Link to post
Share on other sites
I like them short. ;)But you didn't answer the question (at least know that I am aware... :( ) Suppose this WAS a long trip and I entered 170/230: what's the use of entering 230 when the plane only seems to follow the first level? How does the plane know when to go to the next level...? Should I enter all levels into the plan manually? If so, what's the use of entering them here? I probably am overlooking something obvious...
On longer flights airliners perform so called step climbs, to get to a higher altitude as they get lighter. This is done to burn less fuel and thus increase range and save money.What you are doing by entering multiple flight levels, is to let the FMC know how big you want the "steps" to be. On Boeing aircraft you can enter a "step climb size", which will essentially do the same. Now if you enter flight levels that are for instance 2000 feet apart (330, 350, 370, 390) the FMC will calculate optimum points of climb for you. When you approach a step climb you still have to manually adjust the altitude on the MCP (AFS on the 11?). This is to prevent the aircraft to climb automatically without clearance from ATC.RegardsAlex

Share this post


Link to post
Share on other sites
Guest

Thanks for all the answers. It's clear now! Posting some replies twice helped a lot... :( (Only kidding: I also had severe problems getting things posted during that time!!!)

Share this post


Link to post
Share on other sites

I know, this forum's performance is inadequate sometimes and impossible the rest.


Dan Downs KCRP

Share this post


Link to post
Share on other sites

I just what to add an another question to this.Is it possible to enter scheduled step downs?This route:EFHK N0470F320 PIVAK P854 PIR UY70 PRI/N0467F340 UL80 TOGMI UP855 ABADA DCT 65N000E/M082F340 66N010W 66N020W 65N030W/M082F300 63N040W 59N050W DCT LOACH DCT FOXXE/N0471F360 N264A TAFFY/N0471F400 DCT ENE ENE4 KJFKshows a scheduled step down at 65N030W to FL300. Whenever I try to add this using the INIT page, I get invalid step down, or something a long those lines.Would I have to manually enter this altitude in the Vertical Reference page for the said waypoint?

Share this post


Link to post
Share on other sites
I just what to add an another question to this.Is it possible to enter scheduled step downs?This route:EFHK N0470F320 PIVAK P854 PIR UY70 PRI/N0467F340 UL80 TOGMI UP855 ABADA DCT 65N000E/M082F340 66N010W 66N020W 65N030W/M082F300 63N040W 59N050W DCT LOACH DCT FOXXE/N0471F360 N264A TAFFY/N0471F400 DCT ENE ENE4 KJFKshows a scheduled step down at 65N030W to FL300. Whenever I try to add this using the INIT page, I get invalid step down, or something a long those lines.Would I have to manually enter this altitude in the Vertical Reference page for the said waypoint?
Looks like a real world flightplan there! In which case the drop down would be to miss a bad windage in the jetstream. Dispatch planning is wonderful. And yes you would need to implement the step down manually as it's probably outside the 'envelope' for that stage of flight.If you're using fs weather of course there is no need to.John Ellison

Share this post


Link to post
Share on other sites

The FCOM warns against entering step descents. If I recall, the FMC either won't take it, or enter descent phase indefinitely. Either way, don't try it.

Share this post


Link to post
Share on other sites
The FCOM warns against entering step descents. If I recall, the FMC either won't take it, or enter descent phase indefinitely. Either way, don't try it.
An intermediate descent can simply be done by descending to the required altitude AND re-entering that new altitude on the INIT Page to re-enter the Cruise Mode.Would not be surprized if in this Flightplan the intermediate step-down was planned due to low fuel temps.Regards,Harry

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
Sign in to follow this  

  • Tom Allensworth,
    Founder of AVSIM Online


  • 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!

    Click here for more information and to see all donations year to date.
×
×
  • Create New...