Flight crew of a cessna citation C750, on 2 different occasions, are stopped in their climb and returned to an altitude just passed by ATC due to a possible traffic conflict and to maintain required separation.

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Attributes
ACN	422408
Time
Date	199812
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : bwi
State Reference	MD
Altitude	msl bound lower : 4700 msl bound upper : 5000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	general aviation : corporate
Make Model Name	Cessna Citation Undifferentiated or Other Model
Operating Under FAR Part	Part 91
Navigation In Use	Other
Route In Use	departure other enroute : on vectors
Flight Plan	IFR
Aircraft 2
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Operating Under FAR Part	other : unknown
Flight Phase	cruise other
Flight Plan	IFR
Person 1
Affiliation	Other
Function	flight crew : captain oversight : pic
Qualification	pilot : commercial pilot : cfi pilot : instrument
Experience	flight time last 90 days : 150 flight time total : 10000 flight time type : 1000
ASRS Report	422408
Person 2
Affiliation	Other
Function	flight crew : first officer
Qualification	pilot : cfi pilot : commercial pilot : instrument
Experience	flight time last 90 days : 150 flight time total : 6000 flight time type : 100
ASRS Report	422626
Events
Anomaly	other anomaly other
Independent Detector	other controllera
Resolutory Action	controller : issued new clearance other
Consequence	faa : reviewed incident with flight crew
Miss Distance	horizontal : 12000 vertical : 500
Supplementary
Air Traffic Incident	Operational Error

Narrative:

On radar vector by bwi (or washington) departure control on 280 degree heading, assigned at approximately XX35Z. Told to climb from 4000 ft to 10000 ft MSL. At 5000 ft MSL was told to maintain 4000 ft due to traffic at 10 O'clock and 5000 ft. I immediately descended to 4000 ft. At about 4700 ft, got a TA but no RA. Had visual on conflicting aircraft as soon as it was called out by ATC and maintained visual throughout the maneuver. Do not know if other aircraft saw or had TA/RA. At XX40Z, another controller (maybe ZDC -- I am not sure which) told us to climb to 17000 ft. As I passed 16000 ft he said to level at 16000 ft. Went to 16200 ft before able to return to 16000 ft. It was a busy day in washington. Told to call ATC. Called ATC and gave him the above descriptions. Our passenger did not complain or may not have even known of the problems. Maybe our aircraft climbs too fast for the computer or maybe they (ATC) just need more experience with this aircraft. I do not know.

Original NASA ASRS Text

Title: FLC OF A CESSNA CITATION C750, ON 2 DIFFERENT OCCASIONS, ARE STOPPED IN THEIR CLB AND RETURNED TO AN ALT JUST PASSED BY ATC DUE TO A POSSIBLE TFC CONFLICT AND TO MAINTAIN REQUIRED SEPARATION.

Narrative: ON RADAR VECTOR BY BWI (OR WASHINGTON) DEP CTL ON 280 DEG HDG, ASSIGNED AT APPROX XX35Z. TOLD TO CLB FROM 4000 FT TO 10000 FT MSL. AT 5000 FT MSL WAS TOLD TO MAINTAIN 4000 FT DUE TO TFC AT 10 O'CLOCK AND 5000 FT. I IMMEDIATELY DSNDED TO 4000 FT. AT ABOUT 4700 FT, GOT A TA BUT NO RA. HAD VISUAL ON CONFLICTING ACFT AS SOON AS IT WAS CALLED OUT BY ATC AND MAINTAINED VISUAL THROUGHOUT THE MANEUVER. DO NOT KNOW IF OTHER ACFT SAW OR HAD TA/RA. AT XX40Z, ANOTHER CTLR (MAYBE ZDC -- I AM NOT SURE WHICH) TOLD US TO CLB TO 17000 FT. AS I PASSED 16000 FT HE SAID TO LEVEL AT 16000 FT. WENT TO 16200 FT BEFORE ABLE TO RETURN TO 16000 FT. IT WAS A BUSY DAY IN WASHINGTON. TOLD TO CALL ATC. CALLED ATC AND GAVE HIM THE ABOVE DESCRIPTIONS. OUR PAX DID NOT COMPLAIN OR MAY NOT HAVE EVEN KNOWN OF THE PROBS. MAYBE OUR ACFT CLBS TOO FAST FOR THE COMPUTER OR MAYBE THEY (ATC) JUST NEED MORE EXPERIENCE WITH THIS ACFT. I DO NOT KNOW.

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.