During a departure climb, a cpr BE20 flight crew experiences fuel venting from a gas cap and then an altitude deviation during their return land at 55J, fl.

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Attributes
ACN	535394
Time
Date	200101
Day	Wed
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : 55j.airport
State Reference	FL
Altitude	msl single value : 2000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : jax.tracon
Operator	general aviation : corporate
Make Model Name	Super King Air 200 HDC
Operating Under FAR Part	Part 91
Navigation In Use	other
Flight Phase	descent : approach
Route In Use	approach : visual
Flight Plan	IFR
Person 1
Affiliation	company : corporate
Function	flight crew : first officer
Qualification	pilot : multi engine pilot : instrument pilot : commercial pilot : atp
Experience	flight time last 90 days : 110 flight time total : 4100 flight time type : 380
ASRS Report	535394
Person 2
Affiliation	company : corporate
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : commercial pilot : instrument pilot : multi engine
Experience	flight time last 90 days : 81 flight time total : 6100 flight time type : 900
ASRS Report	535697
Events
Anomaly	aircraft equipment problem : critical altitude deviation : excursion from assigned altitude non adherence : clearance
Independent Detector	other controllera
Resolutory Action	controller : issued advisory none taken : detected after the fact
Consequence	faa : reviewed incident with flight crew other
Supplementary
Problem Areas	ATC Human Performance Aircraft Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

On takeoff we observed fuel venting from the left outboard fuel cap (not uncommon in the king air). We notified ATC and said that we wanted to return to the airport. We were cleared back to the airport and made a left turn to enter left base to runway 4 at 55J. The PNF changed frequencys to notify the local traffic of our intentions. Meanwhile (unknown to us) approach was trying to call. I began a descent into the pattern for landing and the PNF switched back to jax approach to cancel IFR. The controller advised us that we were well off of our assigned altitude and that our cancellation was received. We landed without further incident. Supplemental information from acn 535697: controller gave instructions 'cleared left turn direct to airport.' I was the PNF and became very busy with checklists and radio. PF heard cleared left to airport, and I believe he took that clearance as cleared for the visual. He descended out of 2000 ft without my knowledge.

Original NASA ASRS Text

Title: DURING A DEP CLB, A CPR BE20 FLC EXPERIENCES FUEL VENTING FROM A GAS CAP AND THEN AN ALTDEV DURING THEIR RETURN LAND AT 55J, FL.

Narrative: ON TKOF WE OBSERVED FUEL VENTING FROM THE L OUTBOARD FUEL CAP (NOT UNCOMMON IN THE KING AIR). WE NOTIFIED ATC AND SAID THAT WE WANTED TO RETURN TO THE ARPT. WE WERE CLRED BACK TO THE ARPT AND MADE A L TURN TO ENTER L BASE TO RWY 4 AT 55J. THE PNF CHANGED FREQS TO NOTIFY THE LCL TFC OF OUR INTENTIONS. MEANWHILE (UNKNOWN TO US) APCH WAS TRYING TO CALL. I BEGAN A DSCNT INTO THE PATTERN FOR LNDG AND THE PNF SWITCHED BACK TO JAX APCH TO CANCEL IFR. THE CTLR ADVISED US THAT WE WERE WELL OFF OF OUR ASSIGNED ALT AND THAT OUR CANCELLATION WAS RECEIVED. WE LANDED WITHOUT FURTHER INCIDENT. SUPPLEMENTAL INFO FROM ACN 535697: CTLR GAVE INSTRUCTIONS 'CLRED L TURN DIRECT TO ARPT.' I WAS THE PNF AND BECAME VERY BUSY WITH CHKLISTS AND RADIO. PF HEARD CLRED L TO ARPT, AND I BELIEVE HE TOOK THAT CLRNC AS CLRED FOR THE VISUAL. HE DSNDED OUT OF 2000 FT WITHOUT MY KNOWLEDGE.

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.