Citation II S2/Bravo (C550)
Air Traffic Control Fully Certified
Air Traffic Control Time Certified In Pos 1 (yrs) 4.0
Communication Breakdown; Training / Qualification; Situational Awareness; Human-Machine Interface
ATC Issue All Types; Airspace Violation All Types; Deviation - Altitude Undershoot; Deviation / Discrepancy - Procedural Clearance
Air Traffic Control Issued New Clearance
Human Factors; Procedure; Airspace Structure; Chart Or Publication
A departure was radar identified during a relief briefing. The aircraft was instructed to climb to 3;000 feet and turn to a 320 degree heading; then contact the next sector for approach to [destination airport]. When the aircraft checked in; it was not climbing to 3;000 feet; but rather level at the original assigned altitude of 2;500 feet. The aircraft was cleared for a Visual Approach prior to entering the 2;800 foot Minimum Vectoring Area in the area.I believe I missed the read back of the altitude assignment while switching headphone jacks with the relieving controller.I will not change headphone jacks during transmissions and read back of transmissions.
A Controller reported not hearing an altitude read back error because he had unplugged his headset momentarily to plug into a different headset jack.