A300 first officer reported returning to the departure airport due to an open cargo door indication.

Attributes
ACN	1507652
Time
Date	201712
Local Time Of Day	0601-1200
Place
Locale Reference	ZZZ.TRACON
State Reference	US
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	A300
Operating Under FAR Part	Part 121
Flight Phase	Initial Climb
Flight Plan	IFR
Component
Aircraft Component	Door Warning System
Person 1
Function	Pilot Flying First Officer
Qualification	Flight Crew Air Transport Pilot (ATP) Flight Crew Instrument
Experience	Flight Crew Last 90 Days 100 Flight Crew Total 3300 Flight Crew Type 200
Events
Anomaly	Aircraft Equipment Problem Less Severe

Narrative:

Shortly after takeoff at 2000 feet AGL; the master caution light illuminated with a single audible tone. The ECAM displayed an open condition for the lower forward cargo door. All exterior doors were verified closed while signing the weight and balance paperwork and during the before start checklist. The captain made a decision to return to ZZZ and began to coordinate with flight control. The first officer coordinated with ATC for vectors to return for a visual approach to the same runway just departed. Due to the compressed time line we [advised ATC]. The crew accomplished the approach checklist; set up for and briefed the approach; and executed normal procedures for a visual approach and landing. After landing; the gateway personnel verified that the lower forward cargo door was still closed. During taxi back the ECAM door open indication went away and indicated a normal (closed) condition.

Original NASA ASRS Text

Title: A300 First Officer reported returning to the departure airport due to an open cargo door indication.

Narrative: Shortly after takeoff at 2000 feet AGL; the master caution light illuminated with a single audible tone. The ECAM displayed an open condition for the lower forward cargo door. All exterior doors were verified closed while signing the weight and balance paperwork and during the before start checklist. The captain made a decision to return to ZZZ and began to coordinate with flight control. The FO coordinated with ATC for vectors to return for a visual approach to the same runway just departed. Due to the compressed time line we [advised ATC]. The crew accomplished the approach checklist; set up for and briefed the approach; and executed normal procedures for a visual approach and landing. After landing; the gateway personnel verified that the lower forward cargo door was still closed. During taxi back the ECAM door open indication went away and indicated a normal (closed) condition.

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.