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Guest Hingham2008

Quick Fmc Question 747

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I may be missing something but my 747, after programming the FMC, only follows to the first waypoint and does not continue programmed route. All "appears" fine in the route/legs. What have I missed. Thanks.....Dave

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Need more information and a screen shot of the legs page would be helpful. When you say the 744 is not following to the next waypoint, do you mean using one of the autopilot modes? If so a screen shot of the 2D cockpit would also be helpful.

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Need more information and a screen shot of the legs page would be helpful. When you say the 744 is not following to the next waypoint, do you mean using one of the autopilot modes? If so a screen shot of the 2D cockpit would also be helpful.
I activate F/D before takeoff with LNAV. The aircraft follows the FMC loaded flight plan perfectly to the first waypoint but does not continue to cycle through to the next waypoint stored in the FMC etc...... I have no errors..discountinuity etc.... The same flightplans are followed perfectly in the PMDG 737 but not the 747.Dave
I may be missing something but my 747, after programming the FMC, only follows to the first waypoint and does not continue programmed route. All "appears" fine in the route/legs. What have I missed. Thanks.....Dave
Here's the flightplan in question.Generated by vroute.info premium54LLBG1DIRECT1 N 32.010556 E 34.877222 1352611 N 32.0179 E 34.8923 1351135--1000000-1000000DEENA5DIRECT1 N 32.023333 E 34.64 0000SUVAS2UL531 N 32.166667 E 33.983333 0000KAROL5UL531 N 32.866667 E 32.483333 0000ABILO5UL531 N 34.323611 E 30 0000PERIM5UL531 N 35.016944 E 28.638333 0000LATMO5UL531 N 35.138611 E 28.393333 0000MASES5UL531 N 35.823889 E 26.978333 0000SOTIX5UL531 N 35.853333 E 26.903333 0000TIPAS5UL531 N 35.907778 E 26.763333 0000MADEX5UL531 N 36.653056 E 25.398333 0000LIKNI5UL531 N 36.968056 E 24.868611 0000AKORO5UL531 N 37.21 E 24.393333 0000KOR2UL6131 N 37.930411 E 22.9359 0000YNN2UL6111 N 39.700033 E 20.821317 0000TUMBO5UL6111 N 40.067222 E 20.472778 0000OVVER5UL6111 N 40.541667 E 20.012778 0000MAGGI5UL6111 N 41.184167 E 19.376667 0000RODON5UL6111 N 41.458333 E 19.1 0000KOFER5UL6111 N 41.927333 E 18.663583 0000VAKSU5UL6111 N 42.014167 E 18.526944 0000SPL5UL6111 N 43.496581 E 16.304722 0000ZDA5UL6111 N 44.095317 E 15.364206 0000PUL2UN6061 N 44.8925 E 13.918128 0000NAKIT2UL6151 N 45.188056 E 13.447778 0000ROTAR5UL6151 N 45.262778 E 12.995556 0000AKADO2UL6131 N 45.333333 E 12.5 0000LAPAB5UL6131 N 45.529444 E 11.971667 0000VIC5UL6131 N 45.637308 E 11.676353 0000BORMI5UL6131 N 46.036111 E 11.166667 0000DIBAX5UL6131 N 46.116389 E 11.064167 0000SUXAN5UL6131 N 46.562222 E 10.479167 0000RONAK5UL6131 N 46.810556 E 10.150556 0000ARGAX5UL6131 N 47.05 E 9.298056 0000ELMUR5UL6131 N 47.156783 E 8.907608 0000MANEG5UL6131 N 47.204097 E 8.722342 0000RIPUS5UL6131 N 47.260344 E 8.500044 0000DITON5UL6131 N 47.302222 E 8.333333 0000HOC5UL6131 N 47.466556 E 7.665444 0000NATLI5UL6131 N 47.491944 E 7.507222 0000LUL5UL6131 N 47.688278 E 6.295583 0000IXILU5UL6131 N 47.740278 E 6.041389 0000RESPO5UL6131 N 47.832806 E 5.608 0000RLP5UL6131 N 47.906306 E 5.249167 0000ROTSI5UL6131 N 48.276667 E 4.634167 0000KOTUN5UL6131 N 48.724444 E 3.871111 0000PODUK5UL6131 N 49.246111 E 3.350556 0000DIDOR2UT4201 N 49.313611 E 3.281944 0000NITAR5UT4201 N 49.92 E 2.236389 0000ABNUR5UT4201 N 50.171389 E 1.858611 0000DIMAL5UT4201 N 50.4925 E 1.366389 0000ALESO2DIRECT1 N 50.575556 E 1.225556 0000BIG5DIRECT1 N 51.330875 E 0.034811 0000EGLL1-1 N 51.4775 W 0.461389 8327L01 N 51.465 W 0.434078 77183--1000000-1000000

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I have no idea how to read that pasted flight plan, by any chance is the "flight plan:" LLBG DEENA SUVAS UL53 KOR...etc??This is where a screen shot would make things quicker. Is the problem it flys to the first fix DEENA but not to SUVAS?What happens if you manually enter the flight plan (or at least the first couple of fixes)? This is a good test to try to rule out the imported flight plan.

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I have no idea how to read that pasted flight plan, by any chance is the "flight plan:" LLBG DEENA SUVAS UL53 KOR...etc??This is where a screen shot would make things quicker. Is the problem it flys to the first fix DEENA but not to SUVAS?What happens if you manually enter the flight plan (or at least the first couple of fixes)? This is a good test to try to rule out the imported flight plan.
That is the problem...exactly. Flys to DEENA and not to SUVAS. I did not enter the plan manually.....but build with Vroute.

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Try my suggestion. Manually build the flight plan (or at least the first couple of segments past SUVAS) and see if it tracks the flight path. I am not familiar with Vroute and cannot offer any help with it, but I am pretty sure I can help with the FMC/CDU usage.

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Try my suggestion. Manually build the flight plan (or at least the first couple of segments past SUVAS) and see if it tracks the flight path. I am not familiar with Vroute and cannot offer any help with it, but I am pretty sure I can help with the FMC/CDU usage.
hi there,I would like to step in this discussion as I do have exactly the same problem. Does not matter whether I feed the FMC manually or take a prepared route. The queen accept WP1 straight, afterwards change heading towards WP2 and than return to WP1unless I manually put WP3 in front. The same Problem I had once (1 year ago before uninstalling this nice bird) and I solved it, but I cant remember how.Normally I do not use the VNAV facilities. Could that be the problem? Thanks in advance for kind attention and reply.regardsClaus-J

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The VNAV selection should not affect LNAV performance.There is not a known bug in the FMS that would cause the aircraft return to last fix instead of proceeding to next fix. There have been a few reports of this behavior but I don't recall the reporter providing an update on the fix. I can't guess since I have not personally experienced this.Claus-J

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The VNAV selection should not affect LNAV performance.There is not a known bug in the FMS that would cause the aircraft return to last fix instead of proceeding to next fix. There have been a few reports of this behavior but I don't recall the reporter providing an update on the fix. I can't guess since I have not personally experienced this.Claus-J

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The attachments appear to be taken while parked and before the flightplan is executed (there are no speeds/altitudes). Please provide the same shot of the ND and CDU before and after passing the first fix

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I've just tried to recreate your problem...and I have! This happened because I hadn't set up the performance data in the PERF INIT page of the FMC(which you would explain why there are no speed/altitude predictions/constraints in your legs page). LNAV was engaged but it never followed the waypoints.Could setting up the performance data be the step you are missing?Robert T

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I've just tried to recreate your problem...and I have! This happened because I hadn't set up the performance data in the PERF INIT page of the FMC(which you would explain why there are no speed/altitude predictions/constraints in your legs page). LNAV was engaged but it never followed the waypoints.Could setting up the performance data be the step you are missing?Robert T
hi folks,thats me again now in 'inflight' status.I started with PMDG 747 cold and dark at KPAE, departing runwy 16R Programmed WP's are BF SZ SEABF passed (as you can see from the screen) heading towards SZ (on course) next WP showing SEA.AP on LNAV speed V/S engagednow I say: you have controllregardsCJK

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From your FMC I can see that there are no altitude or speed predictions located next to each waypoint. This shows that either you have not executed your flightplan (which I can see you have because of the magenta line) or that you have not set up your performance data in the PERF INIT page...just like I said in my last post.You need to enter ZFW, Reserves, Cost Index and CRZ altitude for the FMC to calculate at which speed and altitude it will cross each waypoint. Although you are not using VNAV, it looks as though you still need this performance data for LNAV to work correctly.Robert T

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That doesn't look like the flight plan is Activated. I don't see any speed or Alt constraints.Rob

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