<< >> NASA ASRS Report 595508, October 2003

Flight crew of SW3 execute go around at san when GPWS gives terrain warning when descending for the localizer runway 27 approach.

Attributes
ACN	595508
Time
Date	200310
Day	Thu
Place
Locale Reference	atc facility : sct.tracon
State Reference	CA
Altitude	msl single value : 4000
Environment
Flight Conditions	IMC
Aircraft 1
Controlling Facilities	tower : msp.tower
Operator	common carrier : air carrier
Make Model Name	Saab-Scania Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	ils localizer & glide slope : 27 other
Flight Phase	descent : approach
Route In Use	approach : instrument precision
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
ASRS Report	595508
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Events
Anomaly	other spatial deviation
Independent Detector	aircraft equipment : gpws
Resolutory Action	controller : issued new clearance flight crew : executed go around
Supplementary
Problem Areas	Airport Flight Crew Human Performance Aircraft
Primary Problem	Airport

Narrative:

On approach into san we were descending to the assigned altitude of 4000 ft on a vector to the localizer runway 27 approach course when we heard 'terrain, terrain' on ground proximity warning system. We were IMC, so therefore we executed an immediate escape from 4000 ft to 4500 ft to get above the clouds to ensure terrain clearance. We notified ATC and cancelled the approach and were vectored for a new localizer runway 27 approach to runway 27.

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Original NASA ASRS Text

Title: FLT CREW OF SW3 EXECUTE GAR AT SAN WHEN GPWS GIVES TERRAIN WARNING WHEN DSNDING FOR THE LOC RWY 27 APCH.

Narrative: ON APCH INTO SAN WE WERE DSNDING TO THE ASSIGNED ALT OF 4000 FT ON A VECTOR TO THE LOC RWY 27 APCH COURSE WHEN WE HEARD 'TERRAIN, TERRAIN' ON GND PROX WARNING SYS. WE WERE IMC, SO THEREFORE WE EXECUTED AN IMMEDIATE ESCAPE FROM 4000 FT TO 4500 FT TO GET ABOVE THE CLOUDS TO ENSURE TERRAIN CLRNC. WE NOTIFIED ATC AND CANCELLED THE APCH AND WERE VECTORED FOR A NEW LOC RWY 27 APCH TO RWY 27.

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.