A319
Flight Crew Air Transport Pilot (ATP)
Communication Breakdown; Confusion
Deviation - Altitude Overshoot; Deviation / Discrepancy - Procedural Clearance; Deviation / Discrepancy - Procedural Published Material / Policy
Air Traffic Control Provided Assistance; Flight Crew Returned To Clearance
Chart Or Publication
We were descending down to 3000ft. I do not recall whether or not ATC called it FL030 but the approach chart has a transition level at FL180. This is were we reset to QNH. While holding at 3000 feet ATC informed us that our altimeter readout was 2800 feet and instructed us to switch to 29.92 and return to FL030 which we did.
[Report narrative contained no additional information.]
A319 flight crew reported an altitude overshoot on descent due to confusion with the charted transition level.