The A300 crew noticed a missing panel during an intermediate walk-around.

Attributes
ACN	1344245
Time
Date	201603
Local Time Of Day	1801-2400
Place
Locale Reference	ZZZ.Airport
State Reference	US
Aircraft 1
Make Model Name	A300
Operating Under FAR Part	Part 121
Flight Phase	Taxi
Flight Plan	IFR
Component
Aircraft Component	Wing Access Panel
Person 1
Function	Pilot Not Flying Captain
Qualification	Flight Crew Air Transport Pilot (ATP)
Person 2
Function	Pilot Flying First Officer
Qualification	Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	Aircraft Equipment Problem Less Severe Inflight Event / Encounter Other / Unknown

Narrative:

First officer (first officer) 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 first officer 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.

Original NASA ASRS Text

Title: The A300 crew noticed a missing panel during an intermediate walk-around.

Narrative: 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.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.