A climbing J41 PIC experiences a speed deviation when the crew misunderstands the departure controller's instructions for climb speed restrs northeast of stl, mo.

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Attributes
ACN	450227
Time
Date	199909
Day	Tue
Local Time Of Day	0601 To 1200
Place
Locale Reference	navaid : csx.vor
State Reference	MO
Altitude	msl bound lower : 3000 msl bound upper : 5000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : t75.tracon
Operator	common carrier : air carrier
Make Model Name	Jetstream 41
Operating Under FAR Part	Part 119
Navigation In Use	other vortac
Flight Phase	climbout : intermediate altitude
Route In Use	departure sid : ns
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : cfi pilot : multi engine pilot : instrument
Experience	flight time last 90 days : 220 flight time total : 2000 flight time type : 750
ASRS Report	450227
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	non adherence : clearance other anomaly
Independent Detector	other controllera
Resolutory Action	controller : issued new clearance controller : separated traffic
Consequence	faa : reviewed incident with flight crew
Supplementary
Problem Areas	Airspace Structure ATC Human Performance Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

During a departure from stl, we were given a climb to 3000 ft. We leveled off and increased our speed, ATC kept our altitude of 3000 ft longer than usual for other departures. Once ATC instructed us to climb, we were faster than our climb speed of 170 KTS, we were doing about 230 KTS. The captain (PF) set 170 on the autoplt and the aircraft started to climb and slow down. ATC at this time gave us instructions to reduce climb speed to 180. We did this, but once we leveled off, the captain started to increase speed. ATC at this time asked us what our speed was and gave us a vector 40-50 degrees left of our course, then stl departure pretty much told us that we needed to follow his instructions. During the last few communications with ATC, we understood that 'reduce climb to 180 KTS' was only for the climb, this is why the captain increased the speed after leveloff. I feel that if ATC didn't use the term 'reduce climb to 180' and instead said 'reduce speed' this problem would not come up.

Original NASA ASRS Text

Title: A CLBING J41 PIC EXPERIENCES A SPD DEV WHEN THE CREW MISUNDERSTANDS THE DEP CTLR'S INSTRUCTIONS FOR CLB SPD RESTRS NE OF STL, MO.

Narrative: DURING A DEP FROM STL, WE WERE GIVEN A CLB TO 3000 FT. WE LEVELED OFF AND INCREASED OUR SPD, ATC KEPT OUR ALT OF 3000 FT LONGER THAN USUAL FOR OTHER DEPS. ONCE ATC INSTRUCTED US TO CLB, WE WERE FASTER THAN OUR CLB SPD OF 170 KTS, WE WERE DOING ABOUT 230 KTS. THE CAPT (PF) SET 170 ON THE AUTOPLT AND THE ACFT STARTED TO CLB AND SLOW DOWN. ATC AT THIS TIME GAVE US INSTRUCTIONS TO REDUCE CLB SPD TO 180. WE DID THIS, BUT ONCE WE LEVELED OFF, THE CAPT STARTED TO INCREASE SPD. ATC AT THIS TIME ASKED US WHAT OUR SPD WAS AND GAVE US A VECTOR 40-50 DEGS L OF OUR COURSE, THEN STL DEP PRETTY MUCH TOLD US THAT WE NEEDED TO FOLLOW HIS INSTRUCTIONS. DURING THE LAST FEW COMS WITH ATC, WE UNDERSTOOD THAT 'REDUCE CLB TO 180 KTS' WAS ONLY FOR THE CLB, THIS IS WHY THE CAPT INCREASED THE SPD AFTER LEVELOFF. I FEEL THAT IF ATC DIDN'T USE THE TERM 'REDUCE CLB TO 180' AND INSTEAD SAID 'REDUCE SPD' THIS PROB WOULD NOT COME UP.

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.