Date: 201912
Local time of day: 0601-1200
Location: ZZZ.TRACON, US
Flight conditions: VMC
Light: Daylight
Aircraft: Regional Jet 200 ER/LR (CRJ200)
Operator: Air Carrier
Operating under: Part 121
Flight plan: IFR
Mission: Passenger
Flight phase: Takeoff / Launch
Airspace: Class B ZZZ
ATC / advisory: TRACON ZZZ
Aircraft component: Service/Access Door
Component problem: Improperly Operated
Reporter organization: Air Carrier
Reporter function: Pilot Not Flying; First Officer
Reporter qualification: Flight Crew Instrument; Flight Crew Air Transport Pilot (ATP); Flight Crew Multiengine
Second reporter function: Pilot Flying; Captain
Anomaly: Aircraft Equipment Problem Less Severe; Deviation / Discrepancy - Procedural Published Material / Policy; Deviation / Discrepancy - Procedural Maintenance
Detector: Person Flight Crew
When detected: In-flight
Result: Air Traffic Control Provided Assistance; Flight Crew Landed in Emergency Condition; Flight Crew Returned To Departure Airport; General Flight Cancelled / Delayed; General Maintenance Action
Contributing factors: Aircraft; Procedure
Primary problem: Procedure

Narrative: Immediately after rotation a loud buzzing noise started from outside the cockpit on the nose of the aircraft and we received a stall fail caution message. The noise became louder as we increased airspeed and at around 200 KIAS it was almost deafening. We decided to not speed up any more and we leveled off and advised ATC. Then the Captain transferred the flight controls to me while he complied with the QRH for the stall fail caution message. The buzzing continued and we were worried that something essential like the AOA vane was vibrating loose and could cause damage to the aircraft. That; combined with the reduced stall protection and the distraction from the noise led us to decide to return to field and not continue the flight. Since the situation was under control and we were in no immediate danger we did not request priority handling; however ATC gave us priority for us. We burned off fuel until we were below max landing weight; complied with all checklists; and returned to the departure airport without any further problems. After returning to the gate; I went outside to look at the front of the aircraft and found that the oxygen service panel was open. The open door of this panel was in line with the pitot tube and AOA vane which might have caused the stall fail message. At this point I remembered seeing this door open during my preflight; however at the time I paid no attention to it because I thought it was one off the many doors that the ground crew opens and closes during their preparation of the aircraft. I should have looked more closely at the panel; because if I had noticed that it was the oxygen service panel I would've known that it's not one the ground crew uses and I could've closed it myself.Maintenance left the oxygen service panel open when they serviced it the night before. Neither I; the ground crew; nor the deice personnel noticed it open and closed it before takeoff.Provide guidance to pilots as to which panels are routinely opened and which are not; and who is responsible for closing which panels.


Second narrative: Aircraft departure was normal and no issues with the aircraft were brought to the attention of the flight crew. We received a salute from the ramp personnel after push back; taxied to the deice pad; were sprayed with type 1 and 4 fluid wings and tail and again given an all clear salute. Taxied to Runway XXL and departed uneventfully. Shortly after rotation the crew noticed a loud squealing noise from the front right side of the cockpit. As speed increased the noise increased to the point where communication was difficult between crewmembers. Captain was Pilot Flying and elected to climb to 5;000 feet and maintain 200 kts. and assess the aircraft state. Before reaching 1;000 feet AGL; we also received a STALL FAIL caution message. All QRH procedures were completed and the excessive flight deck noise continued. We elected to return to DTW and have the aircraft assessed by maintenance. After burning fuel to get below maximum landing weight; we received vectors to land uneventfully in ZZZ. On approach ATC informed the flight crew that ATC requested priority handling for the flight and that Crash Fire Rescue was standing by. After returning to ZZZ and conducting an aircraft inspection it was discovered that the supplemental oxygen service panel was open on the right front fuselage.The First Officer admitted to seeing the panel open on the aircraft during his walk around and assumed it was opened by the ramp personnel like the communication panel on the front right fuselage. The ramp crew also gave the crew an all clear salute after push back. The deice crew also gave the crew an all clear salute after deicing. I think that it is likely the O2 service panel was opened by maintenance overnight or at another point in time; and was left open. Several different people did a visual inspection of the aircraft and missed that the O2 service panel was possibly loose or open.I suggest that maintenance does a thorough inspection of work areas after completing a task. I also suggest that all individuals conducting external inspections do a thorough inspection and bring any concerns or questions to the flight crew's attention. An all clear salute should include an inspection of the exterior of the aircraft and ensure that all access panels are closed.


Synopsis: CRJ-200 flight crew reported a loud noise and a STALL FAIL caution message on takeoff; resulting in a return to departure airport caused by the crew O2 service door being unsecured.