A320
Flight Crew Instrument; Flight Crew Multiengine; Flight Crew Air Transport Pilot (ATP)
Flight Crew Last 90 Days 197; Flight Crew Type 2625
Aircraft Equipment Problem Less Severe
General Maintenance Action
Aircraft; Human Factors; Procedure
During our pre-departure setup; we noticed that ADR3 (Air Data Reference) had a fault light. We called Maintenance to check out the problem. Mechanic went through all the resets and could not get the fault to go away. The fault was deferrable so Mechanic went through his procedures to defer the problem. During this process he had to pull certain circuit breakers and when he did ADR 2 faulted. After about 20 minutes of trouble shooting the Mechanic realized that the circuit breaker panel was mislabeled. They were one off to the right. He brought up a picture of what the panel should look like and it did not match our plane. Then he pulled two of the breakers and the power loss did not match the label of the pulled breaker. Plus; the standby clock breaker did not have a label and blank circuit breaker had a label. In my opinion this is a serious safety of flight issue. Had we had a problem airborne and the procedure required us to pull a circuit breaker in that row; we would have pulled the wrong one.
A320 Captain reported that while troubleshooting a fault; the mechanic discovered that an entire row of circuit breakers were mislabeled.