An air carrier flight crew is distraction by the GPWS warning. The first officer allows the aircraft to climb out their assigned altitude of 9000 ft. The crew had realized the GPWS alert was a false warning.

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Attributes
ACN	423189
Time
Date	199812
Day	Tue
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : ffu airport : slc
State Reference	UT
Altitude	msl bound lower : 9000 msl bound upper : 9500
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Navigation In Use	Other
Flight Phase	cruise other descent other
Route In Use	arrival other enroute : on vectors
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : flight engineer pilot : commercial pilot : cfi
Experience	flight time last 90 days : 180 flight time total : 5000 flight time type : 500
ASRS Report	423189
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Events
Anomaly	altitude deviation : excursion from assigned altitude other anomaly other
Independent Detector	other flight crewa
Consequence	Other
Supplementary
Air Traffic Incident	Pilot Deviation other

Narrative:

Arrival to slc from south of ffu. Cleared to descend to 9000 ft. Captain was flying. Abeam ffu, cleared for visual approach to slc runway 34R. On intercept heading at 9000 ft, we got repeated 'terrain' warnings on our GPWS. As we could visually determine terrain clearance, we did not climb. Captain gave me aircraft control and I hand flew while he attempted to silence the terrain audio warning. During this time, I climbed the aircraft to approximately 9500 ft, partly due to distraction caused by the audible warning, and partly due to discomfort with the fact that we were getting the persistent terrain warning. The warning stopped, I descended back down to 9000 ft, gave the aircraft back to the captain, who completed a visual approach to runway 34R at slc. This problem has occurred on previous occasions for flts arriving slc from the southwest. Slc approach descends us to 9000 ft in vicinity of ffu to 20 mi ssw of ffu and we get the GPWS 'terrain' warning.

Original NASA ASRS Text

Title: AN ACR FLC IS DISTR BY THE GPWS WARNING. THE FO ALLOWS THE ACFT TO CLB OUT THEIR ASSIGNED ALT OF 9000 FT. THE CREW HAD REALIZED THE GPWS ALERT WAS A FALSE WARNING.

Narrative: ARR TO SLC FROM S OF FFU. CLRED TO DSND TO 9000 FT. CAPT WAS FLYING. ABEAM FFU, CLRED FOR VISUAL APCH TO SLC RWY 34R. ON INTERCEPT HDG AT 9000 FT, WE GOT REPEATED 'TERRAIN' WARNINGS ON OUR GPWS. AS WE COULD VISUALLY DETERMINE TERRAIN CLRNC, WE DID NOT CLB. CAPT GAVE ME ACFT CTL AND I HAND FLEW WHILE HE ATTEMPTED TO SILENCE THE TERRAIN AUDIO WARNING. DURING THIS TIME, I CLBED THE ACFT TO APPROX 9500 FT, PARTLY DUE TO DISTR CAUSED BY THE AUDIBLE WARNING, AND PARTLY DUE TO DISCOMFORT WITH THE FACT THAT WE WERE GETTING THE PERSISTENT TERRAIN WARNING. THE WARNING STOPPED, I DSNDED BACK DOWN TO 9000 FT, GAVE THE ACFT BACK TO THE CAPT, WHO COMPLETED A VISUAL APCH TO RWY 34R AT SLC. THIS PROB HAS OCCURRED ON PREVIOUS OCCASIONS FOR FLTS ARRIVING SLC FROM THE SW. SLC APCH DSNDS US TO 9000 FT IN VICINITY OF FFU TO 20 MI SSW OF FFU AND WE GET THE GPWS 'TERRAIN' WARNING.

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.