<< >> NASA ASRS Report 606342, February 2004

B737-300 crew had an GPWS 'terrain terrain' warning at 5000 ft. While being vectored for the ILS runway 8 approach at bur.

Attributes
ACN	606342
Time
Date	200402
Day	Mon
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : bur.airport
State Reference	CA
Altitude	msl single value : 5000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : sct.tracon
Operator	common carrier : air carrier
Make Model Name	B737-300
Operating Under FAR Part	Part 121
Flight Phase	descent : approach descent : intermediate altitude
Route In Use	arrival : on vectors
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Experience	flight time last 90 days : 220 flight time total : 9000 flight time type : 6000
ASRS Report	606342
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Events
Anomaly	inflight encounter other non adherence : required legal separation other anomaly other
Independent Detector	aircraft equipment : gpws other flight crewa other flight crewb
Resolutory Action	other
Consequence	faa : reviewed incident with flight crew
Supplementary
Problem Areas	FAA
Primary Problem	FAA

Narrative:

While on radar vectors to the ILS runway 8 in burbank, we were vectored farther west than usual. We were at 5000 ft and were vectored over a ridge north of fim that is about 4000 ft. We received a GPWS terrain warning and performed the terrain avoidance maneuver, climbing to about 6000 ft. We informed ATC of the warning and our subsequent climb. The controller said the minimum vectoring altitude of that sector was 5000 ft, but that sometimes aircraft do get GPWS alerts. This aircraft is not equipped with the enhanced GPWS. Perhaps that smarter system would not have given us a warning. It doesn't seem prudent to vector an aircraft into a situation which will cause a GPWS warning and require the pilots to do an escape maneuver. The installation of egpws may be solving this problem, otherwise ATC should adjust their procedures to avoid this situation.

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Original NASA ASRS Text

Title: B737-300 CREW HAD AN GPWS 'TERRAIN TERRAIN' WARNING AT 5000 FT. WHILE BEING VECTORED FOR THE ILS RWY 8 APCH AT BUR.

Narrative: WHILE ON RADAR VECTORS TO THE ILS RWY 8 IN BURBANK, WE WERE VECTORED FARTHER W THAN USUAL. WE WERE AT 5000 FT AND WERE VECTORED OVER A RIDGE N OF FIM THAT IS ABOUT 4000 FT. WE RECEIVED A GPWS TERRAIN WARNING AND PERFORMED THE TERRAIN AVOIDANCE MANEUVER, CLBING TO ABOUT 6000 FT. WE INFORMED ATC OF THE WARNING AND OUR SUBSEQUENT CLB. THE CTLR SAID THE MINIMUM VECTORING ALT OF THAT SECTOR WAS 5000 FT, BUT THAT SOMETIMES ACFT DO GET GPWS ALERTS. THIS ACFT IS NOT EQUIPPED WITH THE ENHANCED GPWS. PERHAPS THAT SMARTER SYS WOULD NOT HAVE GIVEN US A WARNING. IT DOESN'T SEEM PRUDENT TO VECTOR AN ACFT INTO A SIT WHICH WILL CAUSE A GPWS WARNING AND REQUIRE THE PLTS TO DO AN ESCAPE MANEUVER. THE INSTALLATION OF EGPWS MAY BE SOLVING THIS PROB, OTHERWISE ATC SHOULD ADJUST THEIR PROCS TO AVOID THIS SIT.

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.