A cpr small transport may have entered class B airspace.

Attributes
ACN	269336
Time
Date	199404
Day	Thu
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : sea airport : pae
State Reference	WA
Altitude	msl bound lower : 9800 msl bound upper : 10000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : sea
Operator	general aviation : corporate
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 91
Flight Phase	cruise other descent other
Route In Use	arrival other enroute airway : sea
Flight Plan	VFR
Aircraft 2
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	other : unknown
Flight Phase	descent other
Route In Use	arrival other
Flight Plan	IFR
Person 1
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : atp
Experience	flight time last 90 days : 120 flight time total : 12000 flight time type : 1200
ASRS Report	269336
Person 2
Affiliation	Other
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	conflict : airborne less severe non adherence : far non adherence : clearance other anomaly other other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa other other : unspecified
Resolutory Action	none taken : detected after the fact
Consequence	faa : reviewed incident with flight crew
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation
Situations
ATC Facility	procedure or policy : unspecified

Narrative:

Aircraft was initially on an IFR flight plan on V-287 proceeding to lofal intersection. Clearance was for VFR on top. Sea approach advised to expedite descent for arriving jet traffic inbound to sea. Copilot advised ATC traffic in sight. Our destination was pae. As we approached lofal, we got visual with the airport. ATC advised to maintain visual contact with jet traffic and remain clear of 'cba' (class B airspace). At the time, we had canceled IFR and started a VFR descent. As I leveled off at 10000 MSL (top of class B airspace), ATC asked altitude. Copilot reported 9800 from his altimeter. My altimeter said 10000. ATC advised class B airspace was 8500-10000 ft. Jet aircraft descending into class B airspace had my aircraft in sight also. Passing lofal intersection, sea approach handed us off to ZSE for descent into pae. The problem occurred because I was not properly aware of the class B airspace boundaries in the area of lofal intersection. Although there was no danger of a collision with the conflicting traffic, it should be noted that a pilot needs to be aware of all aspects of flight. Sea approach's normal procedure for IFR cancellation near the class B airspace is to authorize VFR descent through airspace. Both aircraft had visual contact. One other point, the controller's use of the term 'cba.' I don't believe that is on official term from the ATC glossary. It's use was confusing for a time.

Original NASA ASRS Text

Title: A CPR SMT MAY HAVE ENTERED CLASS B AIRSPACE.

Narrative: ACFT WAS INITIALLY ON AN IFR FLT PLAN ON V-287 PROCEEDING TO LOFAL INTXN. CLRNC WAS FOR VFR ON TOP. SEA APCH ADVISED TO EXPEDITE DSCNT FOR ARRIVING JET TFC INBOUND TO SEA. COPLT ADVISED ATC TFC IN SIGHT. OUR DEST WAS PAE. AS WE APCHED LOFAL, WE GOT VISUAL WITH THE ARPT. ATC ADVISED TO MAINTAIN VISUAL CONTACT WITH JET TFC AND REMAIN CLR OF 'CBA' (CLASS B AIRSPACE). AT THE TIME, WE HAD CANCELED IFR AND STARTED A VFR DSCNT. AS I LEVELED OFF AT 10000 MSL (TOP OF CLASS B AIRSPACE), ATC ASKED ALT. COPLT RPTED 9800 FROM HIS ALTIMETER. MY ALTIMETER SAID 10000. ATC ADVISED CLASS B AIRSPACE WAS 8500-10000 FT. JET ACFT DSNDING INTO CLASS B AIRSPACE HAD MY ACFT IN SIGHT ALSO. PASSING LOFAL INTXN, SEA APCH HANDED US OFF TO ZSE FOR DSCNT INTO PAE. THE PROB OCCURRED BECAUSE I WAS NOT PROPERLY AWARE OF THE CLASS B AIRSPACE BOUNDARIES IN THE AREA OF LOFAL INTXN. ALTHOUGH THERE WAS NO DANGER OF A COLLISION WITH THE CONFLICTING TFC, IT SHOULD BE NOTED THAT A PLT NEEDS TO BE AWARE OF ALL ASPECTS OF FLT. SEA APCH'S NORMAL PROC FOR IFR CANCELLATION NEAR THE CLASS B AIRSPACE IS TO AUTHORIZE VFR DSCNT THROUGH AIRSPACE. BOTH ACFT HAD VISUAL CONTACT. ONE OTHER POINT, THE CTLR'S USE OF THE TERM 'CBA.' I DON'T BELIEVE THAT IS ON OFFICIAL TERM FROM THE ATC GLOSSARY. IT'S USE WAS CONFUSING FOR A TIME.

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.