Regional Jet 700 ER/LR (CRJ700)
Human-Machine Interface
Aircraft Equipment Problem Less Severe; Conflict Ground Conflict; Less Severe
Flight Crew Executed Go Around / Missed Approach; Flight Crew Took Evasive Action
Aircraft
Was direct to KILBE at 3;000 feet for the ILS RW 04 Approach into KLYH. Got the 'Terrain Terrain; Terrain Terrain; Terrain Terrain Pull UP' aural messages. The RA [Resolution Advisory] was erratic at 3;000 feet fluctuating between 2;250-1;500 [feet] the first time. We disconnected the auto pilot and climbed to about 4;000 feet to ensure altitude clearance and to clear the warning. Then; we requested vectors to try again. The second time it did it again but we only got 'Terrain Terrain' one time; and the RA was fluctuating between 2;250-1;400 feet. [We] didn't receive the GPWS [Ground Proximity Warning System] alert and the RA corrected itself and the fluctuations around 1;100 feet. Landed without incident. ATC requested our tail number before frequency change to Tower.[We] Complied with the GPWS and climbed aircraft and requested vectors to restart the approach.No [suggestions] at this time due to the circumstances. [We] got the warning when we shouldn't have; but complied anyways due to IMC conditions. [We] requested box pattern to restart the approach and landed without incident. The RA was erratic and uncontrollable by the pilots.
CRJ-700 Captain reported Ground Proximity Warning System alert on approach and made corrective actions.