<< >> NASA ASRS Report 506068, February 2001

An IMC B757-200 flight crew climbs from their assigned altitude of 6100 ft during MVA vectoring when a GPWS alert is received wsw of las, nv.

Attributes
ACN	506068
Time
Date	200102
Day	Wed
Local Time Of Day	0601 To 1200
Place
Locale Reference	intersection : cresco
State Reference	NV
Altitude	msl bound lower : 6100 msl bound upper : 6900
Environment
Flight Conditions	IMC
Weather Elements	Rain
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : l30.tracon tracon : csg.tracon
Operator	common carrier : air carrier
Make Model Name	B757-200
Operating Under FAR Part	Part 121
Navigation In Use	ils localizer only : 25l
Flight Phase	descent : approach
Route In Use	approach : instrument precision
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : multi engine pilot : atp pilot : flight engineer
Experience	flight time last 90 days : 240 flight time total : 10250 flight time type : 900
ASRS Report	506068
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Events
Anomaly	altitude deviation : excursion from assigned altitude non adherence : clearance
Independent Detector	aircraft equipment : gpws other flight crewa
Resolutory Action	flight crew : exited adverse environment flight crew : took evasive action
Consequence	faa : reviewed incident with flight crew
Supplementary
Problem Areas	Airport ATC Human Performance Flight Crew Human Performance Airspace Structure
Primary Problem	Airspace Structure

Narrative:

While being vectored for las ILS runway 25L at 6100 ft, we received a GPWS terrain warning in IMC. First officer (PF) disconnected the autoplt and climbed to 6900 ft. Advised ATC and resumed the approach. We phoned approach control on the ground, and they said the terrain warning is 'somewhat normal' approaching las from the wsw at that altitude (6100 ft) and position.

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Original NASA ASRS Text

Title: AN IMC B757-200 FLC CLBS FROM THEIR ASSIGNED ALT OF 6100 FT DURING MVA VECTORING WHEN A GPWS ALERT IS RECEIVED WSW OF LAS, NV.

Narrative: WHILE BEING VECTORED FOR LAS ILS RWY 25L AT 6100 FT, WE RECEIVED A GPWS TERRAIN WARNING IN IMC. FO (PF) DISCONNECTED THE AUTOPLT AND CLBED TO 6900 FT. ADVISED ATC AND RESUMED THE APCH. WE PHONED APCH CTL ON THE GND, AND THEY SAID THE TERRAIN WARNING IS 'SOMEWHAT NORMAL' APCHING LAS FROM THE WSW AT THAT ALT (6100 FT) AND POS.

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.