<< >> NASA ASRS Report 1420507, January 2017

Dash-8 flight crew reported receiving intermittent erroneous GPWS alerts while being vectored for an ILS approach.

Attributes
ACN	1420507
Time
Date	201701
Local Time Of Day	1201-1800
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Make Model Name	Dash 8 Series Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	Initial Approach
Flight Plan	IFR
Component
Aircraft Component	GPWS
Person 1
Function	Pilot Flying Captain
Qualification	Flight Crew Air Transport Pilot (ATP)
Person 2
Function	First Officer Pilot Not Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	Aircraft Equipment Problem Less Severe Deviation - Procedural Published Material / Policy

Narrative:

Getting vectored with approach control for ILS in IMC; level at 3;000; we got an abrupt GPWS caution terrain and pull up warning; which stopped after a few seconds. The warning continuously reoccurred throughout the approach until I selected terrain inhibit since it was extremely distracting. Before doing so; we verified our position; asked ATC if they had any low altitude alerts; and selected the terrain display which did not show any terrain. We were level throughout the alerts. On the initial alert I disconnected the autopilot and was ready to begin the escape maneuver but the alert stopped and I remained at the assigned altitude. The first officer and I determined the warnings were erroneous and I made a maintenance write up after landing.

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Original NASA ASRS Text

Title: Dash-8 flight crew reported receiving intermittent erroneous GPWS alerts while being vectored for an ILS approach.

Narrative: Getting vectored with Approach Control for ILS in IMC; level at 3;000; we got an abrupt GPWS caution terrain and PULL UP warning; which stopped after a few seconds. The warning continuously reoccurred throughout the approach until I selected terrain inhibit since it was extremely distracting. Before doing so; we verified our position; asked ATC if they had any low altitude alerts; and selected the terrain display which did not show any terrain. We were level throughout the alerts. On the initial alert I disconnected the autopilot and was ready to begin the escape maneuver but the alert stopped and I remained at the assigned altitude. The FO and I determined the warnings were erroneous and I made a maintenance write up after landing.

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.