An air carrier medium large transport descends below the base of the slc class B when the flight crew uses the slc VOR DME for a crossing altitude versus the ILS DME which was OTS but not notamed.

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Attributes
ACN	398890
Time
Date	199804
Day	Mon
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : slc
State Reference	UT
Altitude	msl bound lower : 7600 msl bound upper : 8000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : slc
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	descent : approach
Route In Use	approach : visual arrival other enroute : on vectors
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air taxi
Make Model Name	Caravan 1 208A
Operating Under FAR Part	Part 135
Flight Phase	descent : approach
Route In Use	approach : visual arrival other
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp pilot : commercial
ASRS Report	398890
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : flight engineer pilot : atp
Experience	flight time last 90 days : 210 flight time total : 14000 flight time type : 10000
ASRS Report	398897
Events
Anomaly	altitude deviation : crossing restriction not met altitude deviation : excursion from assigned altitude non adherence : clearance non adherence : published procedure other anomaly other
Independent Detector	other controllera
Resolutory Action	flight crew : returned to intended course or assigned course other
Consequence	Other
Supplementary
Primary Problem	Navigational Facility
Air Traffic Incident	Pilot Deviation other

Narrative:

At 10000 ft MSL over ogden VOR, cleared for visual runway 16R, told to cross sannd at 8000 ft. DME was OTS, which was necessary to identify sannd. We did not catch that, and mistakenly used the DME off of the slc VORTAC. Left the 8000 ft altitude after 14.1 DME off the slc VORTAC, approximately 2.5 DME early. ATC warned us, we stopped the descent and climbed up, then figured out our error and proceeded to fly the correct descent profile. During the approach, we were also looking for cessna caravan traffic. No conflict with traffic, approach normal after described event. Supplemental information from acn 398897: the runway 16R localizer DME was inoperative (no NOTAM). Approach queried us about the sannd crossing restr and also advised that we had gone below the floor of class B airspace. Contributing factors: traffic distraction, our failure to recognize loss of DME on localizer, mistaken use of slc DME for intersection position.

Original NASA ASRS Text

Title: AN ACR MLG DSNDS BELOW THE BASE OF THE SLC CLASS B WHEN THE FLC USES THE SLC VOR DME FOR A XING ALT VERSUS THE ILS DME WHICH WAS OTS BUT NOT NOTAMED.

Narrative: AT 10000 FT MSL OVER OGDEN VOR, CLRED FOR VISUAL RWY 16R, TOLD TO CROSS SANND AT 8000 FT. DME WAS OTS, WHICH WAS NECESSARY TO IDENT SANND. WE DID NOT CATCH THAT, AND MISTAKENLY USED THE DME OFF OF THE SLC VORTAC. LEFT THE 8000 FT ALT AFTER 14.1 DME OFF THE SLC VORTAC, APPROX 2.5 DME EARLY. ATC WARNED US, WE STOPPED THE DSCNT AND CLBED UP, THEN FIGURED OUT OUR ERROR AND PROCEEDED TO FLY THE CORRECT DSCNT PROFILE. DURING THE APCH, WE WERE ALSO LOOKING FOR CESSNA CARAVAN TFC. NO CONFLICT WITH TFC, APCH NORMAL AFTER DESCRIBED EVENT. SUPPLEMENTAL INFO FROM ACN 398897: THE RWY 16R LOC DME WAS INOP (NO NOTAM). APCH QUERIED US ABOUT THE SANND XING RESTR AND ALSO ADVISED THAT WE HAD GONE BELOW THE FLOOR OF CLASS B AIRSPACE. CONTRIBUTING FACTORS: TFC DISTR, OUR FAILURE TO RECOGNIZE LOSS OF DME ON LOC, MISTAKEN USE OF SLC DME FOR INTXN 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.