Flight crew of large transport has GPWS activate when on approach and on GS with runway in sight.

Attributes
ACN	379718
Time
Date	199709
Day	Thu
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : rno
State Reference	NV
Altitude	msl bound lower : 6000 msl bound upper : 6800
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	tower : rno tower : mem
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Flight Phase	descent : approach descent other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : instrument pilot : flight engineer pilot : atp
Experience	flight time last 90 days : 180 flight time total : 10000 flight time type : 330
ASRS Report	379718
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	aircraft equipment problem : less severe other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	none taken : unable
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

Received GPWS (mode Z) 'terrain, terrain' warning while descending from 6800 ft MSL to 6000 ft MSL on prescribed approach. Runway was in sight, PAPI approach lights in sight with on GS indications. All approach parameters normal except GPWS warning. Missed approach not executed due to crew's visual contact with runway/approach lights and ground. (Night with approximately 1/2 - 3/4 moon.) normal landing with no further indications/warnings.

Original NASA ASRS Text

Title: FLC OF LGT HAS GPWS ACTIVATE WHEN ON APCH AND ON GS WITH RWY IN SIGHT.

Narrative: RECEIVED GPWS (MODE Z) 'TERRAIN, TERRAIN' WARNING WHILE DSNDING FROM 6800 FT MSL TO 6000 FT MSL ON PRESCRIBED APCH. RWY WAS IN SIGHT, PAPI APCH LIGHTS IN SIGHT WITH ON GS INDICATIONS. ALL APCH PARAMETERS NORMAL EXCEPT GPWS WARNING. MISSED APCH NOT EXECUTED DUE TO CREW'S VISUAL CONTACT WITH RWY/APCH LIGHTS AND GND. (NIGHT WITH APPROX 1/2 - 3/4 MOON.) NORMAL LNDG WITH NO FURTHER INDICATIONS/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.