Captain of an air carrier large transport aircraft deviation from descent altitude assignment in response to a GPWS warning.

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Attributes
ACN	228420
Time
Date	199211
Day	Mon
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : rno
State Reference	NV
Altitude	msl bound lower : 9500 msl bound upper : 11000
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other Other
Flight Phase	cruise other descent other
Route In Use	enroute airway : rno
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : cfi
Experience	flight time last 90 days : 225 flight time total : 14000 flight time type : 4000
ASRS Report	228420
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	altitude deviation : excursion from assigned altitude non adherence : clearance other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	flight crew : returned to intended course or assigned course
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	Pilot Deviation

Narrative:

Approaching reno from the northeast, we had been level at 10000 ft for some time and then cleared to 9500 ft. Before we could initiate the descent, the GPWS started squawking repeated 'terrain' warnings which upgraded to a full 'pull-up' warning which we complied with to stop the warning (climb to about 11000 ft). Controller advised and he confirmed our sector was ok to 9500 ft. Approaching rno from the south, you are cautioned about spurious 'terrain' warnings but I've never seen this from the north, especially a full 'pull-up.'

Original NASA ASRS Text

Title: CAPT OF AN ACR LGT ACFT DEV FROM DSCNT ALT ASSIGNMENT IN RESPONSE TO A GPWS WARNING.

Narrative: APCHING RENO FROM THE NE, WE HAD BEEN LEVEL AT 10000 FT FOR SOME TIME AND THEN CLRED TO 9500 FT. BEFORE WE COULD INITIATE THE DSCNT, THE GPWS STARTED SQUAWKING REPEATED 'TERRAIN' WARNINGS WHICH UPGRADED TO A FULL 'PULL-UP' WARNING WHICH WE COMPLIED WITH TO STOP THE WARNING (CLB TO ABOUT 11000 FT). CTLR ADVISED AND HE CONFIRMED OUR SECTOR WAS OK TO 9500 FT. APCHING RNO FROM THE S, YOU ARE CAUTIONED ABOUT SPURIOUS 'TERRAIN' WARNINGS BUT I'VE NEVER SEEN THIS FROM THE N, ESPECIALLY A FULL 'PULL-UP.'

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.