|37000 Feet||Browse and search NASA's
Aviation Safety Reporting System
|Local Time Of Day||0601 To 1200|
|Locale Reference||airport : pdk|
|Altitude||msl bound lower : 1700|
msl bound upper : 3000
|Controlling Facilities||tower : pdk|
|Operator||general aviation : personal|
|Make Model Name||Small Aircraft, High Wing, 1 Eng, Retractable Gear|
|Flight Phase||descent : approach|
|Function||flight crew : single pilot|
|Qualification||pilot : cfi|
pilot : commercial
pilot : instrument
|Experience||flight time last 90 days : 150|
flight time total : 1900
flight time type : 6
|Affiliation||government : faa|
|Function||controller : local|
|Qualification||controller : radar|
|Anomaly||altitude deviation : excursion from assigned altitude|
non adherence : published procedure
non adherence : clearance
|Independent Detector||other controllera|
|Resolutory Action||none taken : anomaly accepted|
|Primary Problem||Flight Crew Human Performance|
|Air Traffic Incident||Pilot Deviation|
Approach control cleared us for approach to peachtree airport, ILS 20L was in use. Our aircraft did not have an operating glide slope so we were shooting the localizer 20L approach. We were to maintain 3000 until marker and to contact pdk tower at the outer marker. This aircraft's audio panel did not have a mkr bcn audio button so I glanced at the approach plate and dialed in a radial to identify the marker, in case I did not have the mkr bcn on correctly. I mistakingly put in a radial to identify an intersection 4 mi outside of the mkr. When the CDI set on the intersection radial centered, I contacted pdk tower and started my descent. When passing through 1700 MSL, tower called saying that approach's restriction still applied and if I would not adhere to the restriction, I would be proceeding at my own risk. At this point, I was VFR so instead of climbing back to 3000 and IMC condition, I maintained 1700 until field was in sight. Correct identification of the outer marker would have avoided premature descent.
Original NASA ASRS Text
Title: IAP LOC APCH GA-SMA STARTED DESCENT OUTSIDE OUTER MARKER.
Narrative: APCH CTL CLRED US FOR APCH TO PEACHTREE ARPT, ILS 20L WAS IN USE. OUR ACFT DID NOT HAVE AN OPERATING GLIDE SLOPE SO WE WERE SHOOTING THE LOC 20L APCH. WE WERE TO MAINTAIN 3000 UNTIL MARKER AND TO CONTACT PDK TWR AT THE OUTER MARKER. THIS ACFT'S AUDIO PANEL DID NOT HAVE A MKR BCN AUDIO BUTTON SO I GLANCED AT THE APCH PLATE AND DIALED IN A RADIAL TO IDENTIFY THE MARKER, IN CASE I DID NOT HAVE THE MKR BCN ON CORRECTLY. I MISTAKINGLY PUT IN A RADIAL TO IDENTIFY AN INTXN 4 MI OUTSIDE OF THE MKR. WHEN THE CDI SET ON THE INTXN RADIAL CENTERED, I CONTACTED PDK TWR AND STARTED MY DSCNT. WHEN PASSING THROUGH 1700 MSL, TWR CALLED SAYING THAT APCH'S RESTRICTION STILL APPLIED AND IF I WOULD NOT ADHERE TO THE RESTRICTION, I WOULD BE PROCEEDING AT MY OWN RISK. AT THIS POINT, I WAS VFR SO INSTEAD OF CLIMBING BACK TO 3000 AND IMC CONDITION, I MAINTAINED 1700 UNTIL FIELD WAS IN SIGHT. CORRECT IDENTIFICATION OF THE OUTER MARKER WOULD HAVE AVOIDED PREMATURE DSCNT.
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.