Altitude deviation altitude crossing restriction not met in IAP ILS DME approach.

Attributes
ACN	204076
Time
Date	199203
Day	Fri
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : clt
State Reference	NC
Altitude	msl bound lower : 1700 msl bound upper : 3100
Environment
Flight Conditions	IMC
Light	Night
Aircraft 1
Controlling Facilities	tracon : clt
Operator	common carrier : air carrier
Make Model Name	Light Transport, Low Wing, 2 Turboprop Eng
Navigation In Use	Other Other
Flight Phase	descent : approach landing : missed approach
Route In Use	approach : straight in
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 200 flight time total : 4800 flight time type : 500
ASRS Report	204076
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : cfi pilot : atp
Experience	flight time last 90 days : 200 flight time total : 2500 flight time type : 260
ASRS Report	203796
Events
Anomaly	altitude deviation : crossing restriction not met non adherence : published procedure non adherence : clearance other spatial deviation
Independent Detector	atc equipment other atc equipment : unspecified other flight crewa
Resolutory Action	other
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation other
Situations
Navigational Aid	Unspecified

Narrative:

Had wrong DME frequency in navigation radios. We overlooked the fact that the runway 18L approach uses fort mill (fml) VOR-DME as the DME reference for the approach fixes, i.e., GS intercept/FAF fix. We assumed clt DME was the DME for this approach, since it is on the field. Confusion arose when DME/marker beacon/instrument GS indications did not match expected indications. We began descent to localizer mins, thinking our GS was inoperative. We were executing map when called by approach for low altitude alert. During vectors back for another approach, another study of the approach plate revealed fml as the proper DME source. With fml tuned and idented, the second approach was routine and uneventful. Corrective suggestion-change the approach to use clt as the DME reference.

Original NASA ASRS Text

Title: ALTDEV ALT XING RESTRICTION NOT MET IN IAP ILS DME APCH.

Narrative: HAD WRONG DME FREQ IN NAV RADIOS. WE OVERLOOKED THE FACT THAT THE RWY 18L APCH USES FORT MILL (FML) VOR-DME AS THE DME REF FOR THE APCH FIXES, I.E., GS INTERCEPT/FAF FIX. WE ASSUMED CLT DME WAS THE DME FOR THIS APCH, SINCE IT IS ON THE FIELD. CONFUSION AROSE WHEN DME/MARKER BEACON/INST GS INDICATIONS DID NOT MATCH EXPECTED INDICATIONS. WE BEGAN DSCNT TO LOC MINS, THINKING OUR GS WAS INOP. WE WERE EXECUTING MAP WHEN CALLED BY APCH FOR LOW ALT ALERT. DURING VECTORS BACK FOR ANOTHER APCH, ANOTHER STUDY OF THE APCH PLATE REVEALED FML AS THE PROPER DME SOURCE. WITH FML TUNED AND IDENTED, THE SECOND APCH WAS ROUTINE AND UNEVENTFUL. CORRECTIVE SUGGESTION-CHANGE THE APCH TO USE CLT AS THE DME REF.

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.