A B737 flight crew report on the problem associated with trying to identify the IAF fix, quirt, on the jac ILS localizer course runway 18. Flight experienced an overshoot onto the localizer course.

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Attributes
ACN	398427
Time
Date	199804
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : jac
State Reference	WY
Altitude	msl bound lower : 15000 msl bound upper : 15000
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zlc
Operator	common carrier : air carrier
Make Model Name	B737 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	cruise other cruise other descent : approach
Route In Use	arrival other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 150 flight time total : 7000 flight time type : 1000
ASRS Report	398427
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	non adherence : clearance non adherence : published procedure other spatial deviation
Independent Detector	other flight crewa
Resolutory Action	flight crew : became reoriented flight crew : returned to intended course or assigned course
Consequence	Other
Supplementary
Primary Problem	Navigational Facility
Air Traffic Incident	Pilot Deviation
Situations
Navigational Aid	Unspecified

Narrative:

The jackson, wy, approach, ILS runway 18, requires the identify of quirt (IAF) for procedure turn, by the use of the jac VOR with DME and cross tune with duniour. The ILS course is to the east of the VOR course. When the procedure turn (to the east) is performed using the VOR to identify 'quirt' the turn back inbound inevitably ends in an overshoot of the ILS final. This is not good because of the high terrain to the west. I did overshoot the ILS but made an aggressive correction to return to the ILS course. It is very discomforting to overshoot the ILS in IMC while in high terrain. I think the approach procedure for jac ILS runway 18 needs to be looked at. Why is it not possible to fly the localizer outbound to quirt? Then you would already be set up on the ILS and the procedure turn would be based on the localizer and not the VOR. The probability of an overshoot would be minimized because you would be aware of your displacement from the localizer course and not the VOR, since the 2 courses are not co- located, or the same!

Original NASA ASRS Text

Title: A B737 FLC RPT ON THE PROB ASSOCIATED WITH TRYING TO IDENT THE IAF FIX, QUIRT, ON THE JAC ILS LOC COURSE RWY 18. FLT EXPERIENCED AN OVERSHOOT ONTO THE LOC COURSE.

Narrative: THE JACKSON, WY, APCH, ILS RWY 18, REQUIRES THE IDENT OF QUIRT (IAF) FOR PROC TURN, BY THE USE OF THE JAC VOR WITH DME AND CROSS TUNE WITH DUNIOUR. THE ILS COURSE IS TO THE E OF THE VOR COURSE. WHEN THE PROC TURN (TO THE E) IS PERFORMED USING THE VOR TO IDENT 'QUIRT' THE TURN BACK INBOUND INEVITABLY ENDS IN AN OVERSHOOT OF THE ILS FINAL. THIS IS NOT GOOD BECAUSE OF THE HIGH TERRAIN TO THE W. I DID OVERSHOOT THE ILS BUT MADE AN AGGRESSIVE CORRECTION TO RETURN TO THE ILS COURSE. IT IS VERY DISCOMFORTING TO OVERSHOOT THE ILS IN IMC WHILE IN HIGH TERRAIN. I THINK THE APCH PROC FOR JAC ILS RWY 18 NEEDS TO BE LOOKED AT. WHY IS IT NOT POSSIBLE TO FLY THE LOC OUTBOUND TO QUIRT? THEN YOU WOULD ALREADY BE SET UP ON THE ILS AND THE PROC TURN WOULD BE BASED ON THE LOC AND NOT THE VOR. THE PROBABILITY OF AN OVERSHOOT WOULD BE MINIMIZED BECAUSE YOU WOULD BE AWARE OF YOUR DISPLACEMENT FROM THE LOC COURSE AND NOT THE VOR, SINCE THE 2 COURSES ARE NOT CO- LOCATED, OR THE SAME!

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.