Flight Crew Multiengine; Flight Crew Instrument; Flight Crew Air Transport Pilot (ATP)
Communication Breakdown; Situational Awareness
ATC Issue All Types; Deviation - Altitude Crossing Restriction Not Met; Deviation - Altitude Overshoot; Deviation / Discrepancy - Procedural Clearance; Deviation / Discrepancy - Procedural Published Material / Policy
Air Traffic Control Provided Assistance; Flight Crew Requested ATC Assistance / Clarification
Human Factors
During descent; Approach Control assigned heading and altitude of 2;300 feet. Assigned altitude was read back; descended to and maintained. The ILS RWY 24 approach clearance contained a vector and an assigned altitude of 3;200 feet until established on the localizer. Intercept vector was given between the fixes JONLI (3;200 feet crossing restriction) and DEFJO (2;400 feet cross restriction). New assigned altitude on intercept vector was read back; and climb initiated until established on localizer.Approach Control initially assigned 2300 feet; then 3;200 feet.Should have questioned initially assigned altitude of 2;300 feet; since it is 100 feet below DEFJO (2;400 feet). Also could have reported field in sight and accept Visual Approach or canceled IFR.
First Officer reported receiving and descending to an altitude below a crossing restriction ahead of them.