Date: 201406
Local time of day: 0601-1200
Location: LEX.TRACON, KY
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: Initial Approach
Airspace: Class C LEX
ATC / advisory: TRACON LEX
Aircraft component: GPWS
Component problem: Design; Malfunctioning
Reporter organization: Air Carrier
Reporter function: First Officer; Pilot Not Flying
Reporter qualification: Flight Crew Air Transport Pilot (ATP)
Human factors: Confusion
Second reporter function: Pilot Flying; Captain
Anomaly: Aircraft Equipment Problem Less Severe
Detector: Automation Aircraft Other Automation; Person Flight Crew
When detected: In-flight
Result: General None Reported / Taken
Contributing factors: Aircraft
Primary problem: Aircraft

Narrative: This was our second flight into LEX today; the same thing happened on our first flight into LEX as well. It appears there is a GPWS database anomaly directly southeast of the BRIDL intersection on the LEX ILS 22. During both instances we were on an almost perfect 90 degree left base to Runway 22; receiving vectors for a visual approach into Runway 22. My best guess would be about 2 miles southeast of the Runway 22 extended centerline. The vectors put us on final roughly 1 mile outside of BRIDL. We were level at an ATC assigned altitude of 3;000 FT. We could visually confirm we were past the 1998 foot towers to the east of the airport. During the first flight; we received a GPWS alert of 'TERRAIN; TERRAIN'; with no lights or other indications. The MFD's did not even activate the terrain function. There were no other indications. On the second flight; we received; 'TERRAIN; TERRAIN; PULL UP!' with no other indications; not even a whooper. The PF (Captain) began to respond by adding power but the warning cleared within a second so we took no further action. On the first flight; after the GPWS alert; I activated the MFD terrain function and saw no terrain or obstacle features that would have caused an issue. I was likely at a 10/5 scale and recall seeing all green; but there may have been some yellow further out; but definitely nowhere near the vicinity of us (the 1998 foot towers were behind us and therefore wouldn't have shown on the display.) After both instances we continued and landed with no further issues.


Second narrative: While being vectored by ATC and at an assigned altitude of 3;000 FT and on an assigned heading for traffic separation landing on Runway 22 in front of us; we were cleared for a visual approach. We were well clear of all terrain and had the towers in sight and were well north of them. They are south east of the final approach fix Bridl NDB. We receive a 'Terrain Terrain' GPWS alert followed by a 'whoop whoop' pull up aural message. I added power immediately and started an initial climb. The messages went away just after I started the climb and only climbed maybe 20 to 50 FT. I believe this was a false warning because we were not near any terrain or obstacles. We also did not receive any other messages or information on our MFD's usually associated with this type of event. This was actually the second time this happened at this airport. We had an earlier flight between the same two airports. The first time the First officer was flying and we were approximately in the same area and again on an assigned altitude of 3;000 FT and assigned heading being vectored for the same visual approach. Also had the towers in sight and were again well past them. This time we received a 'Terrain Terrain' alert but not with the 'whoop whoop' pull up aural message. Our approximately position of these alerts were about one or two miles east of the extended centerline for Runway 22 and from the Bridl NDB.


Synopsis: CRJ-200 flight crew experiences EGPWS terrain warnings on two different approaches to Runway 22 at LEX in the same aircraft. The alerts were about one or two miles east of the extended centerline for Runway 22 with the aircraft at 3;000 FT in VMC.