A300
Flight Crew Air Transport Pilot (ATP)
Other / Unknown
Aircraft Equipment Problem Less Severe; Inflight Event / Encounter Other / Unknown
General Flight Cancelled / Delayed; General Maintenance Action
Human Factors
First Officer (FO) was pilot flying; Captain was pilot monitoring. During the FOs thru flight walk-around; he noticed a large access panel missing on the underside of the left wing; just inboard of the number one engine. The FO stated that he did not notice any panels missing in that area during the previous pre-flight just a few hours before. Suspect the panel departed the aircraft in flight somewhere between ZZZ and ZZZ1. There were no abnormal indications in the cockpit during the flight that would indicate at which point in the flight the panel departed the aircraft. Maintenance history indicated that maintenance had just completed work on a number 1 pneumatic sensor; and it appeared that the missing panel provided access to the pneumatic ducting in that area of the wing.
[Report narrative contained no additional information.]
The A300 crew noticed a missing panel during an intermediate walk-around.