C182 aircraft turned on to final approach course when reporter started descent too soon. Controller intervened and advised reporter he was still 5 mi from descent point.

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Attributes
ACN	402351
Time
Date	199805
Day	Sun
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : pom
State Reference	CA
Altitude	msl bound lower : 4000 msl bound upper : 5000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : ont tower : bos
Operator	general aviation : personal
Make Model Name	Skylane 182/RG Turbo Skylane/RG
Operating Under FAR Part	Part 91
Flight Phase	descent : approach descent other
Flight Plan	IFR
Person 1
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : private pilot : instrument
Experience	flight time last 90 days : 53 flight time total : 740 flight time type : 223
ASRS Report	402351
Person 2
Affiliation	government : faa
Function	controller : approach
Qualification	controller : radar
Events
Anomaly	altitude deviation : excursion from assigned altitude non adherence : published procedure non adherence : clearance other anomaly other
Independent Detector	other controllera
Resolutory Action	flight crew : returned to intended course or assigned course flight crew : became reoriented other
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Turned to final approach course (V363), pom 164 degree radial, started descent. Controller alerted that descent not authority/authorized until prado intersection (los angeles area, commercial chart). I thought I was at prado. Controller said I was 5 mi out. Misinterp to mean west of prado, while I was in fact south. Started turn to east, when I realized my true position and turned back toward correct course, also climbing back to 5000 ft. Approach was completed on course at MDA. Problem came about as follows: 1) I had recently flown the route and approach, was familiar and dialed in the intersection from memory. 2) I misplaced the intersection (prado). 3) because there was very minimal radio and air traffic, conditions in cockpit were relaxed and I became engrossed in conversation with my passenger. This distraction caused me to not doublechk my position and chart on turn to course (V363) and become initially confused when called by ATC. Corrective action: observe my own rule for CRM, ie, silence in the cockpit during critical phases and verification of settings/position.

Original NASA ASRS Text

Title: C182 ACFT TURNED ON TO FINAL APCH COURSE WHEN RPTR STARTED DSCNT TOO SOON. CTLR INTERVENED AND ADVISED RPTR HE WAS STILL 5 MI FROM DSCNT POINT.

Narrative: TURNED TO FINAL APCH COURSE (V363), POM 164 DEG RADIAL, STARTED DSCNT. CTLR ALERTED THAT DSCNT NOT AUTH UNTIL PRADO INTXN (LOS ANGELES AREA, COMMERCIAL CHART). I THOUGHT I WAS AT PRADO. CTLR SAID I WAS 5 MI OUT. MISINTERP TO MEAN W OF PRADO, WHILE I WAS IN FACT S. STARTED TURN TO E, WHEN I REALIZED MY TRUE POS AND TURNED BACK TOWARD CORRECT COURSE, ALSO CLBING BACK TO 5000 FT. APCH WAS COMPLETED ON COURSE AT MDA. PROB CAME ABOUT AS FOLLOWS: 1) I HAD RECENTLY FLOWN THE RTE AND APCH, WAS FAMILIAR AND DIALED IN THE INTXN FROM MEMORY. 2) I MISPLACED THE INTXN (PRADO). 3) BECAUSE THERE WAS VERY MINIMAL RADIO AND AIR TFC, CONDITIONS IN COCKPIT WERE RELAXED AND I BECAME ENGROSSED IN CONVERSATION WITH MY PAX. THIS DISTR CAUSED ME TO NOT DOUBLECHK MY POS AND CHART ON TURN TO COURSE (V363) AND BECOME INITIALLY CONFUSED WHEN CALLED BY ATC. CORRECTIVE ACTION: OBSERVE MY OWN RULE FOR CRM, IE, SILENCE IN THE COCKPIT DURING CRITICAL PHASES AND VERIFICATION OF SETTINGS/POS.

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.