A319 flight crew has egpws terrain warning approaching boi.

Attributes
ACN	553116
Time
Date	200207
Day	Sat
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : boi.airport
State Reference	ID
Altitude	msl bound lower : 5000 msl bound upper : 6000
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	tracon : boi.tracon tracon : zzz2.tracon
Operator	common carrier : air carrier
Make Model Name	A319
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	descent : approach
Route In Use	approach : visual arrival : on vectors
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 150 flight time total : 20000 flight time type : 3000
ASRS Report	553346
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Events
Anomaly	other anomaly other other spatial deviation
Independent Detector	aircraft equipment : gpws other controllera
Resolutory Action	controller : issued alert flight crew : took evasive action flight crew : executed missed approach
Consequence	faa : reviewed incident with flight crew
Supplementary
Problem Areas	Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

At about 20 DME, approach control cleared us to 8000 ft and left 15 degrees (230 degree heading). At approximately 1 DME, cleared to 7000 ft and asked if field in sight for visual approach. At approximately 12 DME we accepted visual approach and turned toward 5 mi centerline fix and began descent to cross at 4500 ft, 140 KTS. Egpws terrain display showed low density on our flight path and airport and vicinity clearly in view. We also appeared to be close to extended runway centerline (runway 28R) when cleared for visual approach at 7000 ft. At about 10 DME, egpws 'terrain, pull up' warning. Immediately applied toga power and climbed. Warning ceased promptly. In retrospect and close analysis, we may have been slightly north of centerline near 5000 ft terrain spots when turn and descent initiated and descent rate too high initially. ATC terrain alert given by approach control simultaneous with egpws.

Original NASA ASRS Text

Title: A319 FLC HAS EGPWS TERRAIN WARNING APCHING BOI.

Narrative: AT ABOUT 20 DME, APCH CTL CLRED US TO 8000 FT AND L 15 DEGS (230 DEG HDG). AT APPROX 1 DME, CLRED TO 7000 FT AND ASKED IF FIELD IN SIGHT FOR VISUAL APCH. AT APPROX 12 DME WE ACCEPTED VISUAL APCH AND TURNED TOWARD 5 MI CTRLINE FIX AND BEGAN DSCNT TO CROSS AT 4500 FT, 140 KTS. EGPWS TERRAIN DISPLAY SHOWED LOW DENSITY ON OUR FLT PATH AND ARPT AND VICINITY CLRLY IN VIEW. WE ALSO APPEARED TO BE CLOSE TO EXTENDED RWY CTRLINE (RWY 28R) WHEN CLRED FOR VISUAL APCH AT 7000 FT. AT ABOUT 10 DME, EGPWS 'TERRAIN, PULL UP' WARNING. IMMEDIATELY APPLIED TOGA PWR AND CLBED. WARNING CEASED PROMPTLY. IN RETROSPECT AND CLOSE ANALYSIS, WE MAY HAVE BEEN SLIGHTLY N OF CTRLINE NEAR 5000 FT TERRAIN SPOTS WHEN TURN AND DSCNT INITIATED AND DSCNT RATE TOO HIGH INITIALLY. ATC TERRAIN ALERT GIVEN BY APCH CTL SIMULTANEOUS WITH EGPWS.

Data retrieved from NASA's ASRS site as of July 2007 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.