LR45 on ILS runway 35R to apa encountered glideslope fluctuations. Reporter states that this anomaly is a recurring problem on this approach.

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Attributes
ACN	765075
Time
Date	200712
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : apa.airport
State Reference	CO
Altitude	msl bound lower : 7700 msl bound upper : 8000
Environment
Flight Conditions	IMC
Weather Elements	Ice
Light	Daylight
Aircraft 1
Controlling Facilities	tower : apa.tower
Operator	general aviation : corporate
Make Model Name	Learjet 45
Operating Under FAR Part	Part 91
Navigation In Use	ils localizer & glide slope : 35r
Flight Phase	descent : approach
Route In Use	approach : instrument precision arrival : on vectors
Flight Plan	IFR
Person 1
Affiliation	company : corporate
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 150 flight time total : 15000 flight time type : 2700
ASRS Report	765075
Events
Anomaly	other anomaly other
Independent Detector	other flight crewa
Resolutory Action	none taken : anomaly accepted
Supplementary
Problem Areas	FAA Navigational Facility
Primary Problem	Navigational Facility
Situations
Navigational Aid	APA.ILS

Narrative:

While conducting the ILS runway 35R approach to apa airport. From approximately the casse outer marker inbound to approximately 4 miles (DME) to end of runway. The glideslope indicators fluctuate (or porpoise) +/- 2 to 3 degrees from center. Two separate navigation receivers on the aircraft both showed the fluctuations. This is a recurring problem for this ILS approach to apa. Has been reported to tower at apa and confirmed by other aircraft on this same approach and at other dates.

Original NASA ASRS Text

Title: LR45 ON ILS RWY 35R TO APA ENCOUNTERED GLIDESLOPE FLUCTUATIONS. RPTR STATES THAT THIS ANOMALY IS A RECURRING PROBLEM ON THIS APCH.

Narrative: WHILE CONDUCTING THE ILS RWY 35R APCH TO APA ARPT. FROM APPROX THE CASSE OUTER MARKER INBOUND TO APPROX 4 MILES (DME) TO END OF RWY. THE GLIDESLOPE INDICATORS FLUCTUATE (OR PORPOISE) +/- 2 TO 3 DEGS FROM CENTER. TWO SEPARATE NAV RECEIVERS ON THE ACFT BOTH SHOWED THE FLUCTUATIONS. THIS IS A RECURRING PROB FOR THIS ILS APCH TO APA. HAS BEEN REPORTED TO TOWER AT APA AND CONFIRMED BY OTHER ACFT ON THIS SAME APCH AND AT OTHER DATES.

Data retrieved from NASA's ASRS site as of January 2009 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.