A320
Flight Crew Air Transport Pilot (ATP)
Flight Crew Last 90 Days 240; Flight Crew Total 12000; Flight Crew Type 7644
Distraction; Human-Machine Interface
Deviation - Altitude Crossing Restriction Not Met; Deviation / Discrepancy - Procedural Clearance
Air Traffic Control Issued New Clearance
Human Factors
On the BOJID ONE arrival we were cleared out of FL330 to cross COFAX at FL240. We set the altitude in the FCU and the restriction in the FMGC. I pushed to initiate the descent and failed to verify the FMA's [Flight Mode Annunciator] that we were indeed in the descent; the First Officer noticed as we checked in with a frequency change and I took the autopilot off; autothrust off; and immediately attempted the crossing restriction but failed to do so as the First Officer simultaneously got relief from the Controller and vectors for the descent. We were inadvertently distracted by our conversation in the cockpit.
A320 Captain reports failing to verify that the FMA shows that descent has been initiated after being assigned a crossing restriction on the BOJID ONE Arrival to PHL.