<< >> NASA ASRS Report 432512, March 1999

An air carrier MD80 flight crew reacted to a terrain warning from their GPWS. Later, at their safe altitude, they saw conflicting traffic and descended back to their original altitude.

Attributes
ACN	432512
Time
Date	199903
Day	Tue
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : bur.airport
State Reference	CA
Altitude	msl bound lower : 5000 msl bound upper : 7000
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	tracon : sct.tracon
Operator	common carrier : air carrier
Make Model Name	MD-80 Super 80
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	descent : intermediate altitude
Route In Use	arrival : on vectors
Flight Plan	IFR
Aircraft 2
Controlling Facilities	tracon : sct.tracon
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Operating Under FAR Part	Part 91
Flight Phase	cruise : level
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : multi engine pilot : instrument pilot : commercial
ASRS Report	432512
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
ASRS Report	432513
Events
Anomaly	conflict : airborne less severe other spatial deviation
Independent Detector	aircraft equipment : gpws other flight crewa other flight crewb
Resolutory Action	flight crew : took precautionary avoidance action flight crew : took evasive action
Consequence	other
Supplementary
Problem Areas	Environmental Factor
Primary Problem	Environmental Factor

Narrative:

Level at 5000 ft and being vectored to bur airport in VMC at night, received a GPWS alert. I was flying and followed the procedures for a GPWS alert. Climbed to 7000 ft and leveled. Captain, then I, got visual traffic on light aircraft at 7000 ft. I returned to 5000 ft with ATC permission, then continued vectors to an uneventful approach and landing.

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Original NASA ASRS Text

Title: AN ACR MD80 FLC REACTED TO A TERRAIN WARNING FROM THEIR GPWS. LATER, AT THEIR SAFE ALT, THEY SAW CONFLICTING TFC AND DSNDED BACK TO THEIR ORIGINAL ALT.

Narrative: LEVEL AT 5000 FT AND BEING VECTORED TO BUR ARPT IN VMC AT NIGHT, RECEIVED A GPWS ALERT. I WAS FLYING AND FOLLOWED THE PROCS FOR A GPWS ALERT. CLBED TO 7000 FT AND LEVELED. CAPT, THEN I, GOT VISUAL TFC ON LIGHT ACFT AT 7000 FT. I RETURNED TO 5000 FT WITH ATC PERMISSION, THEN CONTINUED VECTORS TO AN UNEVENTFUL APCH AND LNDG.

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.