Flight Crew Air Transport Pilot (ATP)
Aircraft Equipment Problem Critical; Deviation / Discrepancy - Procedural Maintenance; Deviation / Discrepancy - Procedural Published Material / Policy
Air Traffic Control Provided Assistance; Flight Crew Returned To Departure Airport; General Maintenance Action; General Flight Cancelled / Delayed
Procedure; Aircraft
We initially had an issue with GPWS message when we switched power from external to APU. Circuit breaker popped an we called Maintenance. They were able to fix the problem and reset the circuit breaker. After that all was normal until we rotated and got to about 100-200 FT off the ground and we started to hear a very loud noise while climbing. The Captain checked the electric page and saw the ADG was deployed. We finished climbing out on the SID to 7;000 FT. Informed ATC of the situation and ran the QRH. We requested to return. We finished the flight without any other problems or incidents.
On the ground we shut down the aircraft at Gate XX after receiving ground power. We left the gate area to get food and came back to the airplane powered up the aircraft and then a few minutes later started the APU. Once we transferred the power from the ground to the APU we had a hard transfer and then noticed we had a windshear and GPWS fail status message and then we checked the circuit breaker panel and noticed that the GND PROX WARN circuit breaker was popped. Notified Maintenance and they fixed the problem. We then pushed back from the gate and taxied to Runway 4R. Once we were airborne at about 100 FT and when the First Officer called for gear up we heard a loud nose thinking it was the nose gear. After the gear was up and locked noise still persisted checked the electrical EICAS page and noticed the ADG was deployed. We notified dispatch and ATC that we then needed to air return to ZZZ. We ran the QRH for inadvertent ADG deployment and landed safely back in Detroit with all systems operating normally.Cause: Possible bad power at the Gate XX.
CRJ-200 flight crew reported a loud noise on initial climb and elected to return to the departure airport.