A320
Flight Crew Instrument; Flight Crew Multiengine; Flight Crew Air Transport Pilot (ATP)
Situational Awareness
Deviation - Altitude Undershoot; Deviation - Altitude Crossing Restriction Not Met; Deviation / Discrepancy - Procedural Clearance; Deviation / Discrepancy - Procedural Published Material / Policy
Air Traffic Control Issued New Clearance; Flight Crew Became Reoriented
Human Factors
While on the KORRY 4 arrival into LGA; Washington Center instructed us to cross RIDGY at FL270. The pilot flying set FL270 on the altitude select and managed the descent. The FMS was programmed to cross RIDGY at or above FL270. We forgot to reprogram the FMS to cross RIDGY at FL270. After a couple of minutes we realized our error and we knew we will not be able to make the altitude restriction. We informed Washington Center that we will not be able to make the altitude restriction. Washington Center instructed us to descend to FL240.Make sure to verify and check that the proper altitude restriction is programmed in the FMS.
A320 Captain reported failing to make a crossing restriction at RIDGY that was modified by ATC on the KORRY 4 arrival into LGA.