Altitude deviation air carrier X GPWS during descent to assigned altitude.

Attributes
ACN	293723
Time
Date	199501
Day	Sun
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : oak
State Reference	CA
Altitude	msl bound lower : 5000 msl bound upper : 5000
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : oak
Operator	common carrier : air carrier
Make Model Name	B727 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	descent other
Route In Use	arrival other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 230 flight time total : 18000 flight time type : 7000
ASRS Report	293723
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	non adherence : clearance other spatial deviation
Independent Detector	aircraft equipment other aircraft equipment : unspecified
Resolutory Action	flight crew : took evasive action
Consequence	faa : reviewed incident with flight crew
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	other

Narrative:

Air carrier X from den-oak, was on approach to oak for runway 11 approach in IMC conditions. We had been assigned a locke 1 arrival and had proceeded en route direct to modesto. We resumed the locke 1 arrival from modesto, intercepting the scd RIO7 and after locke intersection, were given 'descend to 5000 ft and maintain.' in the vicinity of 10 mi ese of oak VOR (almost abeam of oak VOR), the GPWS went off 'terrain, terrain, pull up.' in accordance with company emergency procedure (E10.1) thrust to maximum, rotate 15 degrees nose up, advise ATC, reduced thrust and leveled at 6500 ft. Approach advised mia 5000 ft our routing and cleared us back to descend to 5000 ft. No engine parameters were exceeded and remaining portion of approach was normal. Discussion by telephone with bay approach supervisor indicated we most likely had encountered rising terrain in vicinity of mount diablo which is 3849 ft. Sectional shows 1 bit at 3865 ft. Supervisor said this has happened before when working runway 11 arrs to get traffic below runway 19 traffic at sfo.

Original NASA ASRS Text

Title: ALTDEV ACR X GPWS DURING DSCNT TO ASSIGNED ALT.

Narrative: ACR X FROM DEN-OAK, WAS ON APCH TO OAK FOR RWY 11 APCH IN IMC CONDITIONS. WE HAD BEEN ASSIGNED A LOCKE 1 ARR AND HAD PROCEEDED ENRTE DIRECT TO MODESTO. WE RESUMED THE LOCKE 1 ARR FROM MODESTO, INTERCEPTING THE SCD RIO7 AND AFTER LOCKE INTXN, WERE GIVEN 'DSND TO 5000 FT AND MAINTAIN.' IN THE VICINITY OF 10 MI ESE OF OAK VOR (ALMOST ABEAM OF OAK VOR), THE GPWS WENT OFF 'TERRAIN, TERRAIN, PULL UP.' IN ACCORDANCE WITH COMPANY EMER PROC (E10.1) THRUST TO MAX, ROTATE 15 DEGS NOSE UP, ADVISE ATC, REDUCED THRUST AND LEVELED AT 6500 FT. APCH ADVISED MIA 5000 FT OUR ROUTING AND CLRED US BACK TO DSND TO 5000 FT. NO ENG PARAMETERS WERE EXCEEDED AND REMAINING PORTION OF APCH WAS NORMAL. DISCUSSION BY TELEPHONE WITH BAY APCH SUPVR INDICATED WE MOST LIKELY HAD ENCOUNTERED RISING TERRAIN IN VICINITY OF MOUNT DIABLO WHICH IS 3849 FT. SECTIONAL SHOWS 1 BIT AT 3865 FT. SUPVR SAID THIS HAS HAPPENED BEFORE WHEN WORKING RWY 11 ARRS TO GET TFC BELOW RWY 19 TFC AT SFO.

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.