After departure a crj-200 radio altimeter indication began fluctuating affecting the GPWS so; after ...

Narrative:

Just after takeoff we encountered fluctuating radar altimeter readings and associated nuisance GPWS alerts. I contacted maintenance control. I indicated numerous times that we had; in fact; departed. Maintenance control advised us to pull and reset circuit breakers associated with the GPWS and radar altimeter system; which we did. At this time maintenance control realized that we were in the air already. We were then instructed to reset all circuit breakers; consult our QRH and talk to flight control for further instructions. When the circuit breakers were reset the problem initially corrected itself; but returned shortly thereafter. The captain then consulted with flight control and we decided to return to the departure airport. The radar altimeter problem was intermittent with periodic RA flags; so I ran the QRH checklist again in preparation for landing. The rest of the flight was uneventful.my communication with maintenance control was lacking. However at no time did maintenance control verify if we were on the ground or in the air. Also; communication in the cockpit broke down and led to a violation of company sops; i.e. Pulling circuit breakers in flight.I can double check something when it goes against sops. I assumed that the captain felt as though pulling circuit breakers was necessary for the safe completion of the flight. I also assumed that maintenance control knew we were in flight and were giving us instructions accordingly. Neither of these two assumptions was explicitly stated; however. I know for next time.

Original NASA ASRS Text

Title: After departure a CRJ-200 radio altimeter indication began fluctuating affecting the GPWS so; after resetting circuit breakers at Maintenance's advise; the aircraft returned to land with the faults continuing.

Narrative: Just after takeoff we encountered fluctuating radar altimeter readings and associated nuisance GPWS alerts. I contacted Maintenance Control. I indicated numerous times that we had; in fact; departed. Maintenance Control advised us to pull and reset circuit breakers associated with the GPWS and radar altimeter system; which we did. At this time Maintenance Control realized that we were in the air already. We were then instructed to reset all circuit breakers; consult our QRH and talk to Flight Control for further instructions. When the circuit breakers were reset the problem initially corrected itself; but returned shortly thereafter. The Captain then consulted with Flight Control and we decided to return to the departure airport. The radar altimeter problem was intermittent with periodic RA flags; so I ran the QRH checklist again in preparation for landing. The rest of the flight was uneventful.My communication with Maintenance Control was lacking. However at no time did Maintenance Control verify if we were on the ground or in the air. Also; communication in the cockpit broke down and led to a violation of company SOPs; i.e. pulling circuit breakers in flight.I can double check something when it goes against SOPs. I assumed that the Captain felt as though pulling circuit breakers was necessary for the safe completion of the flight. I also assumed that Maintenance Control knew we were in flight and were giving us instructions accordingly. Neither of these two assumptions was explicitly stated; however. I know for next time.

Data retrieved from NASA's ASRS site as of July 2013 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.

Attributes
ACN	1098512
Time
Date	201307
Local Time Of Day	0601-1200
Place
Locale Reference	ZZZ.ARTCC
State Reference	US
Environment
Light	Daylight
Aircraft 1
Make Model Name	Regional Jet 200 ER/LR (CRJ200)
Operating Under FAR Part	Part 121
Flight Phase	Climb
Flight Plan	IFR
Component
Aircraft Component	Radio Altimeter
Person 1
Function	Pilot Not Flying First Officer
Qualification	Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	Aircraft Equipment Problem Less Severe Deviation - Procedural Published Material / Policy

After departure a crj-200 radio altimeter indication began fluctuating affecting the GPWS so; after resetting circuit breakers at maintenance's advise; the aircraft returned to land with the faults continuing.