ALT captures on waypoints in STAR

[Fplazola 0]

Dear All,

 

I was descending via the QUBEN 1 RNAV STAR into KTPA and the ALT would capture on every waypoint with a double altitude restriction (i.e QUBEN 250/12000B9000A) even with the altitude selector set at a much lower altitude than the waypoint restriction, the autopilot captures altitude at 12000' and stays engaged, does not allow selection of another vertical mode, V/S or SPD.

 

I don't think this is normal autopilot behavior. 

 

Thank you and kind regards,

 

Fernando Plazola

[A_Pilot 70]

For our reference, are you flying with the VNAV mode engaged?

[Fplazola 0]

VNAV not engaged. Descending using SPEED reference mode.

[Hans Hartmann 3695]

Without VNAV, the vertical modes only capture on the selected altitude. The pilot need to set it manually to meet the next constraint.

[A_Pilot 70]

It seems strange.... What was annunciators in the too of the FMA on the PFD? Did it do an ALTS CAP? 

[Fplazola 0]

Dear All,

 

The behavior has not repeated since I updated to 2.2.0.1.

 

It has not happened again in other STARs with same way-point restriction logic. (Between two altitudes)

 

Consider this item closed.

 

Thank you all for the help.

 

Kind regards,

 

Fernando Plazola

[Hans Hartmann 3695]

Because we believe this topic has been answered we have closed it. If you have any more questions feel free to open a new topic.