LJ35 crew was told by ZLC controller a procedure turn was mandatory on runway 18 at jac.

Attributes
ACN	461715
Time
Date	200001
Day	Wed
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : jac.airport
State Reference	WY
Altitude	msl single value : 12000
Environment
Flight Conditions	Mixed
Light	Night
Aircraft 1
Controlling Facilities	artcc : zlc.artcc
Operator	general aviation : personal
Make Model Name	Learjet 35
Operating Under FAR Part	Part 91
Navigation In Use	ils localizer & glide slope : 18
Flight Phase	descent : approach
Route In Use	approach : instrument precision approach : visual
Flight Plan	IFR
Person 1
Affiliation	other
Function	flight crew : first officer
Qualification	pilot : commercial pilot : multi engine
Experience	flight time last 90 days : 300 flight time total : 2800 flight time type : 800
ASRS Report	461715
Person 2
Affiliation	other
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	other anomaly other
Independent Detector	other controllera
Resolutory Action	controller : issued alert
Supplementary
Problem Areas	Chart Or Publication Flight Crew Human Performance
Primary Problem	Chart Or Publication
Situations
Chart	approach : jac ils runway 18

Narrative:

After turning to intercept the localizer inbound at quirt intersection at 12000 ft, ZLC advised us that the procedure turn was mandatory on this ILS. At that time we were VMC and had the airport in sight. We advised ZLC we were continuing and that we had the airport in sight. After landing, we inspected the approach chart closely, only to find we were unclr as to whether the procedure turn is mandatory or not. We feel the wording on the chart is ambiguous for a procedure that could be so important. In conclusion, we were at all the fixes at the appropriate altitudes and are still unsure as to why a procedure turn would be mandatory. It is my opinion that the phrase 'procedure turn mandatory' should be printed more clearly on the plate.

Original NASA ASRS Text

Title: LJ35 CREW WAS TOLD BY ZLC CTLR A PROC TURN WAS MANDATORY ON RWY 18 AT JAC.

Narrative: AFTER TURNING TO INTERCEPT THE LOC INBOUND AT QUIRT INTXN AT 12000 FT, ZLC ADVISED US THAT THE PROC TURN WAS MANDATORY ON THIS ILS. AT THAT TIME WE WERE VMC AND HAD THE ARPT IN SIGHT. WE ADVISED ZLC WE WERE CONTINUING AND THAT WE HAD THE ARPT IN SIGHT. AFTER LNDG, WE INSPECTED THE APCH CHART CLOSELY, ONLY TO FIND WE WERE UNCLR AS TO WHETHER THE PROC TURN IS MANDATORY OR NOT. WE FEEL THE WORDING ON THE CHART IS AMBIGUOUS FOR A PROC THAT COULD BE SO IMPORTANT. IN CONCLUSION, WE WERE AT ALL THE FIXES AT THE APPROPRIATE ALTS AND ARE STILL UNSURE AS TO WHY A PROC TURN WOULD BE MANDATORY. IT IS MY OPINION THAT THE PHRASE 'PROC TURN MANDATORY' SHOULD BE PRINTED MORE CLEARLY ON THE PLATE.

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.