So of widebody transport flight crew inhibited GPWS on approach.

Attributes
ACN	146506
Time
Date	199005
Day	Sun
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : sfo
State Reference	CA
Altitude	msl bound lower : 1200 msl bound upper : 1200
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : sfo
Operator	common carrier : air carrier
Make Model Name	Widebody, Low Wing, 4 Turbojet Eng
Navigation In Use	Other Other
Flight Phase	descent : approach landing other
Route In Use	arrival other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : flight engineer
Experience	flight time last 90 days : 130 flight time total : 22000 flight time type : 850
ASRS Report	146506
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	non adherence : published procedure other anomaly other
Independent Detector	other flight crewa
Resolutory Action	none taken : detected after the fact
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

VOR approach to runway 19L at sfo first officer flying, VMC, clouds 1200' scattered, visibility var 3 mi light rain. After final approach fix, descent rate was reduced, then increased to establish descent profile, near base of scattered cloud layer. The ground proximity warning system (GPWS) sounded while descent was reduced to desired profile. At this time the second officer inhibited the GPWS on his own initiative. The approach was well flown by the first officer to a smooth T/D. After landing I observed the GPWS switch in the inhibited position, and debriefed the second officer on the proper use of this system.

Original NASA ASRS Text

Title: SO OF WDB FLT CREW INHIBITED GPWS ON APCH.

Narrative: VOR APCH TO RWY 19L AT SFO F/O FLYING, VMC, CLOUDS 1200' SCATTERED, VIS VAR 3 MI LIGHT RAIN. AFTER FINAL APCH FIX, DSNT RATE WAS REDUCED, THEN INCREASED TO ESTABLISH DSNT PROFILE, NEAR BASE OF SCATTERED CLOUD LAYER. THE GND PROX WARNING SYS (GPWS) SOUNDED WHILE DSNT WAS REDUCED TO DESIRED PROFILE. AT THIS TIME THE S/O INHIBITED THE GPWS ON HIS OWN INITIATIVE. THE APCH WAS WELL FLOWN BY THE F/O TO A SMOOTH T/D. AFTER LNDG I OBSERVED THE GPWS SWITCH IN THE INHIBITED POS, AND DEBRIEFED THE S/O ON THE PROPER USE OF THIS SYS.

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.