An air carrier flight crew received an apparently spurious egpws terrain warning while on a visual a...

Attributes
ACN	876835
Time
Date	201003
Local Time Of Day	1801-2400
Place
Locale Reference	AVL.Airport
State Reference	NC
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Make Model Name	Medium Transport Low Wing 2 Turbojet Eng
Operating Under FAR Part	Part 121
Flight Phase	Initial Approach
Route In Use	Visual Approach
Flight Plan	IFR
Component
Aircraft Component	GPWS
Person 1
Function	First Officer Pilot Flying
Qualification	Flight Crew Commercial
Person 2
Function	Captain Pilot Not Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	Aircraft Equipment Problem Less Severe Inflight Event / Encounter CFTT / CFIT

Narrative:

I was the pilot flying on a night visual approach to runway 34 in avl. The autopilot was disengaged and I was hand flying the approach with the flight director enabled. We joined the final approach course from the west. We were on the glide slope with the localizer alive when we received a terrain alert. The alert was very brief and extinguished as soon as I began to climb. I do not recall seeing a below glide path indication from the VASI. We rejoined the glide slope and landed without further issues. The terrain alert may have been a false indication from the egpws; as we appeared to be clear of all terrain. It may also have been due to deviations in the glide slope signal. I have noticed in previous flights; on that same approach; that the glide slope will make large deviations; despite the fact that you are visually on the glide path.

Original NASA ASRS Text

Title: An air carrier flight crew received an apparently spurious EGPWS Terrain Warning while on a visual approach to Runway 34 at AVL.

Narrative: I was the pilot flying on a night visual approach to Runway 34 in AVL. The autopilot was disengaged and I was hand flying the approach with the flight director enabled. We joined the final approach course from the west. We were on the glide slope with the localizer alive when we received a terrain alert. The alert was very brief and extinguished as soon as I began to climb. I do not recall seeing a below glide path indication from the VASI. We rejoined the glide slope and landed without further issues. The terrain alert may have been a false indication from the EGPWS; as we appeared to be clear of all terrain. It may also have been due to deviations in the glide slope signal. I have noticed in previous flights; on that same approach; that the glide slope will make large deviations; despite the fact that you are visually on the glide path.

Data retrieved from NASA's ASRS site as of April 2012 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.

An air carrier flight crew received an apparently spurious egpws terrain warning while on a visual approach to runway 34 at avl.