The flight crew of a biv exceeds the 250 KT speed limit under 10000 ft some 30 mi east of lex, ky.

Attributes
ACN	478810
Time
Date	200007
Day	Wed
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : lex.airport
State Reference	KY
Altitude	msl bound lower : 6000 msl bound upper : 10000
Environment
Flight Conditions	Mixed
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : lex.tracon
Operator	general aviation : corporate
Make Model Name	Gulfstream IV
Operating Under FAR Part	Part 91
Flight Phase	descent : vacating altitude
Route In Use	arrival : on vectors
Flight Plan	IFR
Person 1
Affiliation	company : corporate
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 70 flight time total : 16000 flight time type : 450
ASRS Report	478810
Person 2
Affiliation	company : corporate
Function	flight crew : first officer
Qualification	pilot : atp
Events
Anomaly	non adherence : far non adherence : published procedure other anomaly other anomaly other
Independent Detector	other flight crewa
Resolutory Action	flight crew : returned to original clearance
Consequence	Other
Supplementary
Problem Areas	Flight Crew Human Performance Aircraft
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Iad to lex repos flight to pick up passenger. Copilot (another company captain) was PF. ZID cleared us to cross 30 mi east of lex at 12000 ft. ILS runway 4 in use at lex. Made crossing restr then handed off to lex approach. Given left turn vector and descent to 5000 ft. I set up ILS's in the FMS. Coming through 10000 ft, PF called for 'in-range' checklist, at which point we started the APU. Flight engineer said speed was slightly high. I looked down to see 280 KIAS coming through 8900 ft. Flight engineer started checklist by stating 'landing data,' to which I replied 'initialized, posted.' it was following this that I said to the PF to 'check your speed.' shortly after I made a second speed call. Aircraft finally slowed to 250 KIAS passing 6000 ft. PF thought my statement 'check your speed' was in reference to 'landing data' on checklist. Of more importance was the fact that he used 'vertical speed' in descent below 10000 ft instead of 'flight level change' or 'VNAV.' 'vertical speed' is slowest to react to change speed. We should have selected 'flight level change' leaving 12000 ft.

Original NASA ASRS Text

Title: THE FLC OF A BIV EXCEEDS THE 250 KT SPD LIMIT UNDER 10000 FT SOME 30 MI E OF LEX, KY.

Narrative: IAD TO LEX REPOS FLT TO PICK UP PAX. COPLT (ANOTHER COMPANY CAPT) WAS PF. ZID CLRED US TO CROSS 30 MI E OF LEX AT 12000 FT. ILS RWY 4 IN USE AT LEX. MADE XING RESTR THEN HANDED OFF TO LEX APCH. GIVEN L TURN VECTOR AND DSCNT TO 5000 FT. I SET UP ILS'S IN THE FMS. COMING THROUGH 10000 FT, PF CALLED FOR 'IN-RANGE' CHKLIST, AT WHICH POINT WE STARTED THE APU. FE SAID SPD WAS SLIGHTLY HIGH. I LOOKED DOWN TO SEE 280 KIAS COMING THROUGH 8900 FT. FE STARTED CHKLIST BY STATING 'LNDG DATA,' TO WHICH I REPLIED 'INITIALIZED, POSTED.' IT WAS FOLLOWING THIS THAT I SAID TO THE PF TO 'CHK YOUR SPD.' SHORTLY AFTER I MADE A SECOND SPD CALL. ACFT FINALLY SLOWED TO 250 KIAS PASSING 6000 FT. PF THOUGHT MY STATEMENT 'CHK YOUR SPD' WAS IN REF TO 'LNDG DATA' ON CHKLIST. OF MORE IMPORTANCE WAS THE FACT THAT HE USED 'VERT SPD' IN DSCNT BELOW 10000 FT INSTEAD OF 'FLT LEVEL CHANGE' OR 'VNAV.' 'VERT SPD' IS SLOWEST TO REACT TO CHANGE SPD. WE SHOULD HAVE SELECTED 'FLT LEVEL CHANGE' LEAVING 12000 FT.

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.