Regional Jet 900 (CRJ900)
Flight Crew Multiengine; Flight Crew Instrument; Flight Crew Air Transport Pilot (ATP)
Situational Awareness
Aircraft Equipment Problem Less Severe
Flight Crew Returned To Departure Airport; Flight Crew Landed As Precaution
Aircraft
After a normal takeoff all systems were functioning normally during the initial departure phase. Between 5;000 and 6;000 feet; suddenly the FO's radar altimeter began to malfunction; intermittently displaying the 50 tape in his PFD (Primary Flight Display). Shortly after; the landing gear status boxes reappeared on the EICAS (Engine Indication and Crew Alerting System) primary display and began to repeatedly flash yellow. The gear warning horn came on and remained on for most of the rest of this event. We quickly searched our QRH (Quick Reference Handbook) procedures and found nothing that gave us specific instructions. I told ATC (Air Traffic Control) that I would like to remain in the ZZZ area so we could return to the field if necessary. Then the GLD UNSAFE (Ground Lift Dumping) caution displayed on EICAS; giving us a specific problem to address. We ran the QRH and placed the GLD system in MAN DISARM. This quieted the gear horn and the boxes stopped flashing for awhile. Very soon the SPLR/STAB FAULT status message posted. After ACARS (Aircraft Communications and Crew Alerting System) with dispatch and maintenance; the decision was made to return to ZZZ. I had already briefed the Flight Attendants about the possibility and then briefed them and our passengers about returning and that we would have a normal landing without an emergency. We performed all normal checklist and I took control of the aircraft from my FO. We made an uneventful landing and taxi back to the gate.I spoke with the maintenance personnel at the gate and they believe something was wrong with the Radar Altimeter system that drove the other messages.
CRJ-900 flight crew reported multiple system anomalies shortly after takeoff.