Cpr aircraft told to disregard GPWS warning.

Attributes
ACN	326780
Time
Date	199601
Day	Wed
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : bur
State Reference	CA
Altitude	msl bound lower : 5000 msl bound upper : 5000
Environment
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : bur
Operator	general aviation : corporate
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	other : unknown
Flight Phase	descent other
Route In Use	enroute : on vectors
Flight Plan	IFR
Person 1
Affiliation	Other
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 150 flight time total : 9200 flight time type : 1500
ASRS Report	326780
Person 2
Affiliation	Other
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	non adherence : published procedure other spatial deviation
Independent Detector	other flight crewa
Resolutory Action	none taken : anomaly accepted
Consequence	Other
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	other
Situations
ATC Facility	procedure or policy : unspecified

Narrative:

Cpr X based at bur. We usually arrive over pmd and the lynnx 9 arrival. Just prior to lynnx, socal approach radar vectors us to the ssw for the bur ILS runway 08 approach. This usually takes us southwest of the arrival course crossing a ridge line associated with mountain elevation approximately 3700-3900 ft. On many occasions socal approach will descend us to 5000 ft with the comment '5000 ft is my minimum vectoring altitude you may get a GPWS warning which you can disregard'!? Why vector me in a manner that may precipitate a GPWS warning? And why tell me to ignore the warning. Doesn't that defeat the GPWS' purpose? Callback conversation with TRACON supervisor revealed the following information: socal TRACON supervisor stated they are aware of the GPWS problem in bur. The controller phraseology was designed to warn the pilot of a possible GPWS. The controller is not to say disregard GPWS. Supervisor said controllers would be briefed.

Original NASA ASRS Text

Title: CPR ACFT TOLD TO DISREGARD GPWS WARNING.

Narrative: CPR X BASED AT BUR. WE USUALLY ARRIVE OVER PMD AND THE LYNNX 9 ARR. JUST PRIOR TO LYNNX, SOCAL APCH RADAR VECTORS US TO THE SSW FOR THE BUR ILS RWY 08 APCH. THIS USUALLY TAKES US SW OF THE ARR COURSE XING A RIDGE LINE ASSOCIATED WITH MOUNTAIN ELEVATION APPROX 3700-3900 FT. ON MANY OCCASIONS SOCAL APCH WILL DSND US TO 5000 FT WITH THE COMMENT '5000 FT IS MY MINIMUM VECTORING ALT YOU MAY GET A GPWS WARNING WHICH YOU CAN DISREGARD'!? WHY VECTOR ME IN A MANNER THAT MAY PRECIPITATE A GPWS WARNING? AND WHY TELL ME TO IGNORE THE WARNING. DOESN'T THAT DEFEAT THE GPWS' PURPOSE? CALLBACK CONVERSATION WITH TRACON SUPVR REVEALED THE FOLLOWING INFO: SOCAL TRACON SUPVR STATED THEY ARE AWARE OF THE GPWS PROB IN BUR. THE CTLR PHRASEOLOGY WAS DESIGNED TO WARN THE PLT OF A POSSIBLE GPWS. THE CTLR IS NOT TO SAY DISREGARD GPWS. SUPVR SAID CTLRS WOULD BE BRIEFED.

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.