An air carrier crew reported an egpws 'terrain; terrain' warning while being vectored downwind for a...

Attributes
ACN	872621
Time
Date	201002
Local Time Of Day	0601-1200
Place
Locale Reference	OAK.Airport
State Reference	CA
Environment
Flight Conditions	IMC
Light	Dawn
Aircraft 1
Make Model Name	Widebody Low Wing 2 Turbojet Eng
Operating Under FAR Part	Part 121
Flight Phase	Initial Approach
Route In Use	Vectors
Flight Plan	IFR
Person 1
Function	First Officer Pilot Not Flying
Experience	Flight Crew Last 90 Days 30 Flight Crew Total 4500 Flight Crew Type 1500
Person 2
Function	Captain Pilot Flying
Experience	Flight Crew Last 90 Days 110 Flight Crew Total 5000 Flight Crew Type 270
Events
Anomaly	ATC Issue All Types

Narrative:

We were told to descend to 3100 ft on an altimeter setting of 29.82. Just prior to reaching that altitude; the controller re-verified that our clearance was to 3100 ft. I commented to the captain that I could see why; as there was an indication of terrain 1000 ft below us within a couple of miles. We were established at 3100 ft for at least a minute with a hard altitude capture; flying at 250 KIAS; when the egpws audio alert occurred: 'terrain; terrain; pull up.' there was no corresponding indication on the nd of amber or red terrain above us; but the captain initiated the CFIT recovery maneuver. I immediately informed ATC that we were climbing due to a terrain indication; and would stop at 4000 ft. ATC responded and cleared us to 2000 ft to intercept the runway 11 localizer for the approach into oak. We then landed without incident.

Original NASA ASRS Text

Title: An Air Carrier crew reported an EGPWS 'TERRAIN; TERRAIN' warning while being vectored downwind for an OAK Runway 11 ILS. The ND remained green but the crew executed an escape maneuver.

Narrative: We were told to descend to 3100 FT on an altimeter setting of 29.82. Just prior to reaching that altitude; the Controller re-verified that our clearance was to 3100 FT. I commented to the Captain that I could see why; as there was an indication of terrain 1000 FT below us within a couple of miles. We were established at 3100 FT for at least a minute with a hard altitude capture; flying at 250 KIAS; when the EGPWS audio alert occurred: 'TERRAIN; TERRAIN; PULL UP.' There was no corresponding indication on the ND of amber or red terrain above us; but the Captain initiated the CFIT recovery maneuver. I immediately informed ATC that we were climbing due to a terrain indication; and would stop at 4000 FT. ATC responded and cleared us to 2000 FT to intercept the Runway 11 localizer for the approach into OAK. We then landed without incident.

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 crew reported an egpws 'terrain; terrain' warning while being vectored downwind for an oak runway 11 ILS. The nd remained green but the crew executed an escape maneuver.