Flight crew of an medium large transport descended below published approach due to using wrong NAVAI...

Attributes
ACN	304130
Time
Date	199505
Day	Sun
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : las
State Reference	NV
Altitude	msl bound lower : 8000 msl bound upper : 8000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : las artcc : zla
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Flight Phase	descent other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 240 flight time total : 15000 flight time type : 240
ASRS Report	304130
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	altitude deviation : excursion from assigned altitude non adherence : clearance non adherence : published procedure other anomaly other other anomaly other other spatial deviation
Independent Detector	other flight crewa
Resolutory Action	flight crew : exited adverse environment
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

On the approach to runway 25L at las and on the localizer, with no DME, I had the #2 VOR on what I thought was las VOR when in fact it was bld about 10 mi short and to the left. When I checked the frequency, my mind registered 116.9 when in fact it was 116.7. I did descend below the floor of the class B airspace but not back in the class B space at the 20 mi ring. I did not check the frequency close enough that the first officer did what was expected.

Original NASA ASRS Text

Title: FLC OF AN MLG DSNDED BELOW PUBLISHED APCH DUE TO USING WRONG NAVAID.

Narrative: ON THE APCH TO RWY 25L AT LAS AND ON THE LOC, WITH NO DME, I HAD THE #2 VOR ON WHAT I THOUGHT WAS LAS VOR WHEN IN FACT IT WAS BLD ABOUT 10 MI SHORT AND TO THE L. WHEN I CHKED THE FREQ, MY MIND REGISTERED 116.9 WHEN IN FACT IT WAS 116.7. I DID DSND BELOW THE FLOOR OF THE CLASS B AIRSPACE BUT NOT BACK IN THE CLASS B SPACE AT THE 20 MI RING. I DID NOT CHK THE FREQ CLOSE ENOUGH THAT THE FO DID WHAT WAS EXPECTED.

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.

Flight crew of an medium large transport descended below published approach due to using wrong NAVAID.