Commercial Fixed Wing
Flight Crew Multiengine; Flight Crew Air Transport Pilot (ATP); Flight Crew Instrument
Flight Crew Last 90 Days 20; Flight Crew Type 5000
Human-Machine Interface; Distraction
Aircraft Equipment Problem Less Severe; Deviation - Altitude Crossing Restriction Not Met; Deviation - Altitude Undershoot; Deviation / Discrepancy - Procedural Clearance
Air Traffic Control Issued New Clearance; Flight Crew Overcame Equipment Problem
Aircraft; Human Factors
Given crossing restriction of ZZZZZ at 280 knots at FL250. Captain had difficulty getting 280 knots at fix in ZZZZZ1. Finally glad to put the speed into the Descent page because FMS would not allow it on flat Plan page. Yet aircraft was in LNAV/VNAV PATH. The next clue was ZZZ Approach asking us if we had a crossing restriction and we fessed up. He gave us a descent to FL190 and did not sound concerned and didn't have to vector any other aircraft. We are both retiring in a few weeks and that is proving to be a bigger distraction than anticipated.
Air carrier First Officer reported missing an altitude crossing restriction while on arrival.