Flight Crew Air Transport Pilot (ATP); Flight Crew Multiengine; Flight Crew Instrument
Situational Awareness
Deviation - Altitude Crossing Restriction Not Met; Deviation - Altitude Undershoot; Deviation / Discrepancy - Procedural Clearance
Flight Crew Became Reoriented
Human Factors
On the KORRY 4 arrival into LGA; ATC issued a clearance to cross RIDGY at F270. The autopilot was engaged; in VNAV mode; and on profile for the KORRY 4 arrival fixes; but the actual procedure is published to cross RIDGY above F270; displayed in the FMS as '300/27000A.' I failed to edit the STAR procedure to delete the 'A' which caused the aircraft to fly the procedure as published; that is; to cross RIDGY above F270.The Washington Center Controller informed us when we were 8 miles from RIDGY that 'next time; let's cross RIDGY at F270; next time; listen up.' Then he handed us off to the next controller.I intervened and deployed the speed brakes and steepened the descent. We almost made the crossing; but missed RIDGY by 8 miles after we passed the fix. We then resumed the STAR as published.Identification: We were made to be aware of the situation by the ATC controller and then immediately intervened with the automation to correct the error.Cause: I neglected to change the published STAR procedure to the amended instructions given by the controller.Response: Intervention with automation to attempt to comply with clearance.Suggestions: Follow the standard procedure to brief the STAR and any changes issued by ATC should be crosschecked with the published procedure.
Fractional Captain reported failing to make the crossing restriction at RIDGY that had been modified by ATC on the KORRY 4 arrival into LGA.