A 320 FMGC RWY heading mismatch

[Espero]

Hi guys

Yesterday during the line check the examiner said me that if the RWY heading differs more than 6° from the FMGC database during take off, an alarm come on.

I have tried to find something in the FMGS manual, but no result.

Do you know something about this ?

Thanks.

[FlightDetent]

I do not remember learning about such warning. I went through MCDU messages list [DSC-22_20-50-20-38 "A"] for a wide variety of FMGS' version and found nothing as well.

The closest resemblance is RWY/LS MISMATCH which is provided with explanation: During preflight or takeoff, the LS frequency entered on the RAD NAV page does not match the LS associated with the takeoff runway. So not close at all.

regards, FD.

[Espero]

Hi FlightDetent

Yes, I have found the same message, but it is related with an ILS frequency, not a HDG difference, so I think that the examiner referred something different.

Thank you for your reply.

Regards

[RUMBEAR]

Espero

Your checker wasn't referring to the SIDE 1 / SIDE 2 discrepancy message? i.e. CHECK HDG which appears when there is greater than 5 degrees difference.

[Espero]

May be RUMBEAR, but he said specifically difference from the RWY heading and the RWY heading installed in the FMGC database.

[RUMBEAR]

Maybe ask your examiner how would the aircraft know there is a difference between its database and the actual runway heading?

[Espero]

Next time I will meet him I ask it and I publish the answer...

Thanks RUMBEAR.