An air carrier aircraft exceeds 250 KTS below 10000 ft on the big sur 2 arrival procedure into sfo.

Attributes
ACN	430032
Time
Date	199902
Day	Sat
Local Time Of Day	1201 To 1800
Place
State Reference	CA
Altitude	msl bound lower : 9500 msl bound upper : 10000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Navigation In Use	other vortac
Flight Phase	descent : vacating altitude descent : approach
Route In Use	arrival star : big sur 2
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : flight engineer pilot : cfi pilot : atp
Experience	flight time last 90 days : 150 flight time type : 2300
ASRS Report	430032
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial pilot : multi engine
Events
Anomaly	non adherence : far other anomaly
Independent Detector	other flight crewa
Resolutory Action	flight crew : became reoriented
Supplementary
Problem Areas	ATC Human Performance Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

During descent on the big sur 2 arrival to sfo, we were cleared to cross boldr intersection at 10000 ft and to delete the 250 KT speed restr. We were also asked to maintain 310 KTS or greater during descent. Prior to boldr, ATC asked us to level off at an intermediate altitude only 400 ft prior. We began a normal leveloff and informed ATC we would be unable to comply, at which time they canceled the clearance. This placed us high on the profile. In an attempt to comply with the boldr crossing restr of 10000 ft, which we did, this resulted in a momentary and inadvertent exceedance of 250 KTS below 10000 ft. This was brought to my attention by the first officer (PNF). Contributing factors: 1) ATC issuing a clearance beyond the performance capabilities of the aircraft. 2) an attempt to comply with a very difficult crossing restr during a high workload phase of flight. 3) not immediate asking ATC for relief from the 10000 ft boldr restr.

Original NASA ASRS Text

Title: AN ACR ACFT EXCEEDS 250 KTS BELOW 10000 FT ON THE BIG SUR 2 ARR PROC INTO SFO.

Narrative: DURING DSCNT ON THE BIG SUR 2 ARR TO SFO, WE WERE CLRED TO CROSS BOLDR INTXN AT 10000 FT AND TO DELETE THE 250 KT SPD RESTR. WE WERE ALSO ASKED TO MAINTAIN 310 KTS OR GREATER DURING DSCNT. PRIOR TO BOLDR, ATC ASKED US TO LEVEL OFF AT AN INTERMEDIATE ALT ONLY 400 FT PRIOR. WE BEGAN A NORMAL LEVELOFF AND INFORMED ATC WE WOULD BE UNABLE TO COMPLY, AT WHICH TIME THEY CANCELED THE CLRNC. THIS PLACED US HIGH ON THE PROFILE. IN AN ATTEMPT TO COMPLY WITH THE BOLDR XING RESTR OF 10000 FT, WHICH WE DID, THIS RESULTED IN A MOMENTARY AND INADVERTENT EXCEEDANCE OF 250 KTS BELOW 10000 FT. THIS WAS BROUGHT TO MY ATTN BY THE FO (PNF). CONTRIBUTING FACTORS: 1) ATC ISSUING A CLRNC BEYOND THE PERFORMANCE CAPABILITIES OF THE ACFT. 2) AN ATTEMPT TO COMPLY WITH A VERY DIFFICULT XING RESTR DURING A HIGH WORKLOAD PHASE OF FLT. 3) NOT IMMEDIATE ASKING ATC FOR RELIEF FROM THE 10000 FT BOLDR RESTR.

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.