GPWS creates need for altitude deviation altitude excursion during descent procedure.

Attributes
ACN	266049
Time
Date	199403
Day	Sat
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : las
State Reference	NV
Altitude	msl bound lower : 4700 msl bound upper : 5000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : las
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Flight Phase	descent : approach descent other
Route In Use	approach : visual approach : straight in enroute : direct
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : commercial pilot : atp pilot : instrument
Experience	flight time last 90 days : 250 flight time total : 10000 flight time type : 1500
ASRS Report	266049
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial pilot : atp
Experience	flight time last 90 days : 240 flight time total : 13000 flight time type : 1200
ASRS Report	266048
Events
Anomaly	aircraft equipment problem : less severe altitude deviation : excursion from assigned altitude non adherence : clearance other anomaly other other spatial deviation
Independent Detector	aircraft equipment other aircraft equipment : unspecified
Resolutory Action	flight crew : took evasive action
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	Pilot Deviation

Narrative:

On a routine flight from ont-las, we descended and leveled off at 8000 ft. At approximately 18 DME X of the las VOR, approach cleared us for the visual approach to runway 1R. The class B airspace at las was briefed from plate, dated sep/xx/93. Upon reaching 4700 ft MSL at 7 DME las VOR, we encountered a momentary GPWS warning. An immediate climb back to 5000 ft MSL was accomplished. Our instrumentation, including DME, indicated compliance and flight profile was flown as such. The only distraction at the time was parallel VFR traffic landing runway 1L las. No conflict occurred. No comment made by las RAPCON. Landing uneventful.

Original NASA ASRS Text

Title: GPWS CREATES NEED FOR ALTDEV ALT EXCURSION DURING DSCNT PROC.

Narrative: ON A ROUTINE FLT FROM ONT-LAS, WE DSNDED AND LEVELED OFF AT 8000 FT. AT APPROX 18 DME X OF THE LAS VOR, APCH CLRED US FOR THE VISUAL APCH TO RWY 1R. THE CLASS B AIRSPACE AT LAS WAS BRIEFED FROM PLATE, DATED SEP/XX/93. UPON REACHING 4700 FT MSL AT 7 DME LAS VOR, WE ENCOUNTERED A MOMENTARY GPWS WARNING. AN IMMEDIATE CLB BACK TO 5000 FT MSL WAS ACCOMPLISHED. OUR INSTRUMENTATION, INCLUDING DME, INDICATED COMPLIANCE AND FLT PROFILE WAS FLOWN AS SUCH. THE ONLY DISTR AT THE TIME WAS PARALLEL VFR TFC LNDG RWY 1L LAS. NO CONFLICT OCCURRED. NO COMMENT MADE BY LAS RAPCON. LNDG UNEVENTFUL.

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.