Atx cargo pilot of a cessna caravan 208 (C208) descended to final approach altitude on a transition to the final course when ARTCC radar controller assigned him to remain at his present altitude until established. The reporter believed that since the transition route was part of the published approach, he was established.

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Attributes
ACN	411260
Time
Date	199808
Day	Sat
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : ene airport : pwm
State Reference	ME
Altitude	msl bound lower : 2200 msl bound upper : 4000
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	artcc : zbw
Operator	common carrier : air taxi
Make Model Name	Caravan 1 208A
Operating Under FAR Part	Part 135
Flight Phase	descent other
Flight Plan	IFR
Person 1
Affiliation	company : air taxi
Function	flight crew : single pilot
Qualification	pilot : commercial pilot : instrument pilot : cfi pilot : atp
Experience	flight time last 90 days : 250 flight time total : 10000 flight time type : 1250
ASRS Report	411260
Person 2
Affiliation	government : faa
Function	controller : radar
Qualification	controller : radar
Events
Anomaly	altitude deviation : excursion from assigned altitude non adherence : clearance non adherence : published procedure
Independent Detector	other controllera
Resolutory Action	none taken : detected after the fact
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Controller advised to stay at 4000 ft until established, and to depart the ene VOR on R022. R022 is a published part of approach. Once on a published segment, I descended to 2200 ft MSL as indicated on approach. Controller then asked if I was established on localizer. I replied in the negative and was told that I had been told to maintain 4000 ft till established. As far as I am concerned, I did, for I was on a published segment. If the controller wanted me to maintain 4000 ft till established on the localizer, he did not make it clear. I have heard other clrncs issued the same way. Not specifying to maintain altitude till established on the localizer.

Original NASA ASRS Text

Title: ATX CARGO PLT OF A CESSNA CARAVAN 208 (C208) DSNDED TO FINAL APCH ALT ON A TRANSITION TO THE FINAL COURSE WHEN ARTCC RADAR CTLR ASSIGNED HIM TO REMAIN AT HIS PRESENT ALT UNTIL ESTABLISHED. THE RPTR BELIEVED THAT SINCE THE TRANSITION RTE WAS PART OF THE PUBLISHED APCH, HE WAS ESTABLISHED.

Narrative: CTLR ADVISED TO STAY AT 4000 FT UNTIL ESTABLISHED, AND TO DEPART THE ENE VOR ON R022. R022 IS A PUBLISHED PART OF APCH. ONCE ON A PUBLISHED SEGMENT, I DSNDED TO 2200 FT MSL AS INDICATED ON APCH. CTLR THEN ASKED IF I WAS ESTABLISHED ON LOC. I REPLIED IN THE NEGATIVE AND WAS TOLD THAT I HAD BEEN TOLD TO MAINTAIN 4000 FT TILL ESTABLISHED. AS FAR AS I AM CONCERNED, I DID, FOR I WAS ON A PUBLISHED SEGMENT. IF THE CTLR WANTED ME TO MAINTAIN 4000 FT TILL ESTABLISHED ON THE LOC, HE DID NOT MAKE IT CLR. I HAVE HEARD OTHER CLRNCS ISSUED THE SAME WAY. NOT SPECIFYING TO MAINTAIN ALT TILL ESTABLISHED ON THE LOC.

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.