GPWS sounds alarm during arrival into san.

Attributes
ACN	329174
Time
Date	199602
Day	Sun
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : imp airport : san
State Reference	CA
Altitude	msl bound lower : 6000 msl bound upper : 6500
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : san
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other Other
Flight Phase	descent other
Route In Use	arrival star : star
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
ASRS Report	329174
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	other anomaly other
Independent Detector	other flight crewa
Resolutory Action	other
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

Time, XX25Z. ATC frequency, sou. ATC facility, socal approach. Location, IPL250/55. While on the baret 4 arrival to san, just west of pillo we were cleared to descend from 10000 ft MSL to 6000 ft MSL, fly a heading of 240 degrees, and intercept the runway 27 localizer. As we were starting to level off at 6500 ft MSL we got a terrain, terrain and pull up GPWS warnings. We were IMC and the captain immediately pushed the throttles to maximum, hit the toga button, punched off the autoplt and rotated the jet to a 25 degree climb. As we leveled at 10000 ft MSL we informed socal approach what we did and why. She stated that the MVA for that area was 6000 ft MSL. We turned to join the localizer, descended, and made an uneventful landing. No explanation for the GPWS warnings.

Original NASA ASRS Text

Title: GPWS SOUNDS ALARM DURING ARR INTO SAN.

Narrative: TIME, XX25Z. ATC FREQ, SOU. ATC FACILITY, SOCAL APCH. LOCATION, IPL250/55. WHILE ON THE BARET 4 ARR TO SAN, JUST W OF PILLO WE WERE CLRED TO DSND FROM 10000 FT MSL TO 6000 FT MSL, FLY A HEADING OF 240 DEGS, AND INTERCEPT THE RWY 27 LOC. AS WE WERE STARTING TO LEVEL OFF AT 6500 FT MSL WE GOT A TERRAIN, TERRAIN AND PULL UP GPWS WARNINGS. WE WERE IMC AND THE CAPT IMMEDIATELY PUSHED THE THROTTLES TO MAX, HIT THE TOGA BUTTON, PUNCHED OFF THE AUTOPLT AND ROTATED THE JET TO A 25 DEG CLB. AS WE LEVELED AT 10000 FT MSL WE INFORMED SOCAL APCH WHAT WE DID AND WHY. SHE STATED THAT THE MVA FOR THAT AREA WAS 6000 FT MSL. WE TURNED TO JOIN THE LOC, DSNDED, AND MADE AN UNEVENTFUL LNDG. NO EXPLANATION FOR THE GPWS WARNINGS.

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.