Crj-700 flight crew reported that on approach the egpws continued to sound 'terrain' warnings when t...

Attributes
ACN	1555706
Time
Date	201806
Local Time Of Day	0601-1200
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	Regional Jet 700 ER/LR (CRJ700)
Operating Under FAR Part	Part 121
Flight Phase	Initial Approach
Route In Use	Vectors
Flight Plan	IFR
Component
Aircraft Component	GPWS
Person 1
Function	Pilot Flying Captain
Qualification	Flight Crew Multiengine Flight Crew Instrument Flight Crew Air Transport Pilot (ATP)
Person 2
Function	First Officer Pilot Not Flying
Qualification	Flight Crew Multiengine Flight Crew Instrument
Events
Anomaly	Aircraft Equipment Problem Less Severe Inflight Event / Encounter CFTT / CFIT Inflight Event / Encounter Weather / Turbulence

Narrative:

Received multiple false egpws (enhanced ground proximity warning system) warnings on ILS 28 at ZZZ. ATC clearance was to maintain 2;000 until established and cleared ILS 28. While joining the localizer from the south between zzzzz and ZZZZZ1; at approximately 2;300 feet and 500 FPM descent; we began to receive multiple egpws 'terrain' warnings. Weather was day VFR with a scattered layer about 1;000 feet below us; and I could see the runway. I disconnected the autopilot and climbed a couple hundred feet to meet the glide slope. This did not stop the warnings; and we received around six in total; including one 'pull up' warning. We queried ATC who verified us established on the approach. No obstacles are noted near our position on the approach chart; nor was any terrain depicted on the mfd (multi-function flight displays). We then noticed both radio altimeters bouncing erratically by 1;000-2;000 feet. I assume this may have been caused by the scattered layer below us; and was thus triggering the egpws. Since all was normal; we continued the approach and landed normally.

Original NASA ASRS Text

Title: CRJ-700 flight crew reported that on approach the EGPWS continued to sound 'TERRAIN' warnings when there were no obstacles noted and none depicted on the flight displays.

Narrative: Received multiple false EGPWS (Enhanced Ground Proximity Warning System) warnings on ILS 28 at ZZZ. ATC clearance was to maintain 2;000 until established and cleared ILS 28. While joining the localizer from the south between ZZZZZ and ZZZZZ1; at approximately 2;300 feet and 500 FPM descent; we began to receive multiple EGPWS 'terrain' warnings. Weather was day VFR with a scattered layer about 1;000 feet below us; and I could see the runway. I disconnected the autopilot and climbed a couple hundred feet to meet the glide slope. This did not stop the warnings; and we received around six in total; including one 'pull up' warning. We queried ATC who verified us established on the approach. No obstacles are noted near our position on the approach chart; nor was any terrain depicted on the MFD (Multi-function Flight Displays). We then noticed both radio altimeters bouncing erratically by 1;000-2;000 feet. I assume this may have been caused by the scattered layer below us; and was thus triggering the EGPWS. Since all was normal; we continued the approach and landed normally.

Data retrieved from NASA's ASRS site 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.

Crj-700 flight crew reported that on approach the egpws continued to sound 'terrain' warnings when there were no obstacles noted and none depicted on the flight displays.