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touchdown zone elevation

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Hello all,I have been enjoying the 737-6/7/8/900 for the last 5 months.Just last week I decided to update the FMC nav database,so I purchased some navigraph credits and updated to airac0707. I also updated sids/stars. Now I notice thatwhen I select a departure rwy on the route page orselect an approach procedure on the dep/arr page,the touchdown zone elevation along with the altitudereference line on the PFD altimeter scale is off by 50 or so feetat just about every airport Ive tried. I have made surethat the correct QNH is set. Also, the extended runway centerline is also off a few degrees. I assume this is becausethe fmc database has been updated but the fs9 databasehas not been, for example for changes in variation. I justwant to confirm this is an expected problem with updatedFMC vs fs9 and not something wrong with the program.Has anyone else seen this?ThanksA. Cole

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Your assumption is correct. Although the runways haven't moved since FS9 was released there has been a change in mag variation in most places, which accounts for slight change in runway bearing. However, the runway elevation error is primarily due to the unreal FS9 flat airport wereas in the real world each touchdown zone has a slightly different elevation (you can see this on the Airport Diagram). The AIRAC data contains real world elevations but in FS9 you are at whatever elevation the scenery deems to be the airport elevation.


Dan Downs KCRP

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Thanks Mr. Downs for the explanation. Its not that big of dealbut is noticable. Also, I downloaded your procedures fromthe avsim library and simulated a few flights with them.Thanks for the great work!A. Cole

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