B757-200
Flight Crew Air Transport Pilot (ATP)
Situational Awareness
Deviation - Altitude Crossing Restriction Not Met; Deviation / Discrepancy - Procedural Clearance; Deviation / Discrepancy - Procedural Published Material / Policy; Inflight Event / Encounter CFTT / CFIT
Air Traffic Control Issued Advisory / Alert; Flight Crew Returned To Clearance; Flight Crew Became Reoriented
Human Factors
Performing Localizer Runway 27 into SAN. Vectored onto final. While on VNAV Path; aircraft did not honor CIJHI altitude constraint of 2;700 feet (fix outside of FAF REEBO). We were at 2;400 feet when Approach Control notified us of a 'Low Altitude Alert.' We immediately corrected aircraft flight path back to altitude; and completed approach and landing. Reviewing FMS; 1R did not show the required 2700A at CIJHI. I do not know how it dropped out of the flight plan string; but neither pilot caught it. Triple check; compare; and verify the approach and FMS programming and aircraft flight path.
B757 Captain reported descending below charted altitude on approach to SAN triggering a 'low altitude' alert from ATC.