A corporate C550 first officer reported an overspeed landing at cos.

Attributes
ACN	576152
Time
Date	200303
Day	Wed
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : cos.airport
State Reference	CO
Altitude	msl bound lower : 0 msl bound upper : 18000
Environment
Flight Conditions	IMC
Weather Elements	Fog
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : cos.tracon
Operator	general aviation : corporate
Make Model Name	Citation II S2/Bravo
Operating Under FAR Part	Part 91
Navigation In Use	ils localizer & glide slope : 17l
Flight Phase	descent : approach
Route In Use	approach : instrument precision
Flight Plan	IFR
Person 1
Affiliation	company : corporate
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument pilot : multi engine
Experience	flight time last 90 days : 50 flight time total : 1200 flight time type : 600
ASRS Report	576152
Person 2
Affiliation	company : corporate
Function	flight crew : captain oversight : pic
Events
Anomaly	non adherence : clearance non adherence : company policies non adherence : far non adherence : published procedure other anomaly other spatial deviation
Independent Detector	other flight crewa
Resolutory Action	none taken : anomaly accepted
Factors
Maintenance	performance deficiency : fault isolation
Supplementary
Problem Areas	Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

After a low visibility takeoff in blowing snow at cyyc, we flew to cos. Captain made his normal descent above redline with overspd warning circuit breaker pulled out. WX at cos rapidly went down. Approach to runway 17L not briefed. Within approximately 101 mi of FAF, speed was high, and I was calling out speed and distance. The captain reached over and put flaps to approach. A bit later, he asked for approach flaps, and I replied 'you want approach flaps at 260 KTS?' by now the aircraft was nearing the FAF, and speed is still high. Inside the FAF, I was calling out speed, gear, and landing flaps. Gear was not selected down until approximately 2 mi from runway. Captain said we're way too fast on this.' at minimums, I called 'mins go around.' captain continued descent with breakout occurring with the aircraft over the runway. Upon breakout at 170 KTS, lndgs flaps were selected. Prior to touchdown, the captain remarked 'we're floating.' I replied 'sure, we're floating, we're 140 KTS' (that's reference plus about 40). It is a very good thing cos has long runways.

Original NASA ASRS Text

Title: A CORPORATE C550 FO RPTED AN OVERSPEED LNDG AT COS.

Narrative: AFTER A LOW VISIBILITY TKOF IN BLOWING SNOW AT CYYC, WE FLEW TO COS. CAPT MADE HIS NORMAL DSCNT ABOVE REDLINE WITH OVERSPD WARNING CIRCUIT BREAKER PULLED OUT. WX AT COS RAPIDLY WENT DOWN. APCH TO RWY 17L NOT BRIEFED. WITHIN APPROX 101 MI OF FAF, SPD WAS HIGH, AND I WAS CALLING OUT SPD AND DISTANCE. THE CAPT REACHED OVER AND PUT FLAPS TO APCH. A BIT LATER, HE ASKED FOR APCH FLAPS, AND I REPLIED 'YOU WANT APCH FLAPS AT 260 KTS?' BY NOW THE ACFT WAS NEARING THE FAF, AND SPD IS STILL HIGH. INSIDE THE FAF, I WAS CALLING OUT SPD, GEAR, AND LNDG FLAPS. GEAR WAS NOT SELECTED DOWN UNTIL APPROX 2 MI FROM RWY. CAPT SAID WE'RE WAY TOO FAST ON THIS.' AT MINIMUMS, I CALLED 'MINS GO AROUND.' CAPT CONTINUED DSCNT WITH BREAKOUT OCCURRING WITH THE ACFT OVER THE RWY. UPON BREAKOUT AT 170 KTS, LNDGS FLAPS WERE SELECTED. PRIOR TO TOUCHDOWN, THE CAPT REMARKED 'WE'RE FLOATING.' I REPLIED 'SURE, WE'RE FLOATING, WE'RE 140 KTS' (THAT'S REF PLUS ABOUT 40). IT IS A VERY GOOD THING COS HAS LONG RWYS.

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.