Air carrier mdt misid kerrs intersection on pit 28R ILS and descends prior to crossing restriction.

Attributes
ACN	105271
Time
Date	198902
Day	Sun
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : pit
State Reference	PA
Altitude	msl bound lower : 3000 msl bound upper : 4000
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : pit artcc : ztl
Operator	common carrier : air carrier
Make Model Name	Medium Transport, High Wing, 2 Turboprop Eng
Navigation In Use	ils localizer & glide slope : ils
Flight Phase	descent : approach
Route In Use	approach : straight in
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp pilot : cfi
Experience	flight time last 90 days : 200 flight time total : 2500 flight time type : 200
ASRS Report	105271
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	altitude deviation : crossing restriction not met non adherence : clearance non adherence : published procedure other anomaly other
Independent Detector	other flight crewa
Resolutory Action	none taken : detected after the fact
Consequence	Other
Supplementary
Primary Problem	Chart Or Publication
Air Traffic Incident	Pilot Deviation other
Situations
ATC Facility	procedure or policy : unspecified

Narrative:

While cleared for the ILS 28R approach into pit, the captain used the montour DME to identify the stepdown fixes. The kerrs intersection is 13 NM from the runway threshold. However, if using the montour VORTAC to identify kerrs, the aircraft is actually 14.8 NM from the runway threshold. Descending from 5000' at the mmj 13 DME fix places the aircraft at kerrs at 4000' resulting in a conflict with aircraft using the ILS 28L approach. Both aircraft are at 4000' with less than 1 mi horizontal separation. The proper way to identify kerrs intersection is crossing the allegheny county VORTAC 023 radial while on the ILS 28R localizer. Perhaps commercial chart could publish a bulletin advising not to use the mmj VORTAC DME to identify intxns at greater pittsburgh airport.

Original NASA ASRS Text

Title: ACR MDT MISID KERRS INTERSECTION ON PIT 28R ILS AND DESCENDS PRIOR TO CROSSING RESTRICTION.

Narrative: WHILE CLRED FOR THE ILS 28R APCH INTO PIT, THE CAPT USED THE MONTOUR DME TO IDENTIFY THE STEPDOWN FIXES. THE KERRS INTXN IS 13 NM FROM THE RWY THRESHOLD. HOWEVER, IF USING THE MONTOUR VORTAC TO IDENTIFY KERRS, THE ACFT IS ACTUALLY 14.8 NM FROM THE RWY THRESHOLD. DSNDING FROM 5000' AT THE MMJ 13 DME FIX PLACES THE ACFT AT KERRS AT 4000' RESULTING IN A CONFLICT WITH ACFT USING THE ILS 28L APCH. BOTH ACFT ARE AT 4000' WITH LESS THAN 1 MI HORIZ SEPARATION. THE PROPER WAY TO IDENTIFY KERRS INTXN IS XING THE ALLEGHENY COUNTY VORTAC 023 RADIAL WHILE ON THE ILS 28R LOC. PERHAPS COMMERCIAL CHART COULD PUBLISH A BULLETIN ADVISING NOT TO USE THE MMJ VORTAC DME TO IDENTIFY INTXNS AT GREATER PITTSBURGH ARPT.

Data retrieved from NASA's ASRS site as of August 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.