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A/P does not follow LNAV after takeoff


AirbusXFan

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Hi,

My A320 CFM doesn't follow LNAV after I switched to Navigraph (1308). Previously, It was fine when I used the default NavDataPro.

Here is the flight description.

- Flightplan: KSJC AVE KLAX

- Takeoff from KSJC, 30L and set the SID to SJC9.AVE
- Landing to KLAX, 25R and set the STAR to SADDE6.AVE

This issue occurred when I turned on the A/P after takeoff (approx. 500ft AGL).

Usually it will turn right to follow the LNAV to MOONY. But, after I switched to Navigraph-1308, the plane just keep stright (it doesn't turn).

Please try the above flight plan to reconstruct the issue. Thanks.

Best Regards.

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My advice didn't mean that Navigraph Data is wrong. But because the coding of the Navdata is different between NavdataPro and Navigraph, they also should know that there is a problem ;)

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Hi gents,

I have tried to analyse now the example procedure and here are my results:

Navigraph:

SID,SJC9,30L,1
1. DF,DE30L,37.373728,-121.941986,0, ,0.0,0.0,2,470,0,0,0,0,0,0
2. VD, ,0,0,0,SJC,0.0,0.0,303.0,1.8,0,0,0,0,0,0,0,0
3. VI,2, ,0.0,110.0,0,0,0,0,0,0,0,0
4. CF,MOONY,37.138556,-121.572108,0,OAK,121.3,47.0,121.0,23.0,0,0,0,0,0,0,0,0

#1 - direct to fix DE30L at or above 470ft

#2 - heading 303 to dme distance SJC/1.8

#3 - right turn, heading 110 to intercept MOONY/121 (from the next line #4 ... or from OAK 121.3 / 47nm = MOONY, should be the same result)

#4 - course to fix MOONY

NavdataPro:

SID,SJC9,30L,2
1. VA,0,303,2,562,0,0,0,0,0,0
2. FD,SJC,37.37471111,-121.94466667,0,SJC,0.0,1.8,303,1.80,0,0,0,0,0,0,0,0
3. VI,2, ,0,110,0,0,0,0,0,0,0,0
4. CF,MOONY,37.13855556,-121.57210833,0,SJC,112.4,22.7,121,21.00,0,0,0,0,0,0,0,0

#1 - heading 303 to 562ft

#2 - track 303 from SJC to dme distance SJC/1.8

#3 - right turn, heading 110 to intercept MOONY/121 (from the next line #4 ... or SJC 112.4 / 22.7nm = MOONY, should be the same result)

#4 - course to fix MOONY

orry, I can´t see any problem there - not in the coding, nor in the syntax - possible that the ASX developer can take a look on this issue because I´m not sure, if this is really an navdata issue (as you see). And it´s right, the LNAV path is correct on the ND - so something happens behind it, where I have no impact, I guess.

Here a screenshot from the same data but with another program:

KSJC_SJC9_30L.PNG

Cheers,

Richard

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Hi Richard,

thanks a lot for the deep view inside the coding of the 30L/SJC9.AVE Departure route out of San José, California.

I gave it another try yesterday evening using the new AIRAC 1309. Still the same.

Before takeoff the ND looks very promising.

On reaching SJC 1.8 DME

nothing happened as the plane continues straight ahead.

Regards

Hans(-Werner)

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  • 1 month later...

Update:

After installing v1.15 of the Airbus X and using the actual Navigraph AIRAC 1310 the departure out of SJC is flown as expected i.e. the LNAV Route is followed after takeoff.

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