ZDV ARTCC radar controller is upset with PIC of a do-328 that slowed below assigned airspeed without advising when encountering unexpected turbulence approaching den, co.

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Attributes
ACN	511420
Time
Date	200105
Day	Wed
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : zdv.artcc
State Reference	CO
Altitude	msl single value : 16000
Environment
Flight Conditions	Mixed
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	Do 328 TP (Turboprop)
Flight Phase	descent : intermediate altitude
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 240 flight time total : 4500 flight time type : 2800
ASRS Report	511420
Events
Anomaly	inflight encounter : turbulence inflight encounter : weather non adherence : clearance other anomaly other anomaly other
Resolutory Action	controller : issued advisory
Consequence	faa : reviewed incident with flight crew
Supplementary
Problem Areas	Flight Crew Human Performance Weather Environmental Factor Airspace Structure
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

On descent to den, we were asked for maximum forward airspeed for spacing. We hit moderate turbulence and slowed approximately 40 KTS for 2-3 mins. Controller asked our speed and we advised we had slowed. He stated we should have told him we were slowing earlier so he could plan accordingly. I was PNF, conducting operational experience with a new first officer. I was distraction with seating passenger, flight attendant and picking up ATIS.

Original NASA ASRS Text

Title: ZDV ARTCC RADAR CTLR IS UPSET WITH PIC OF A DO-328 THAT SLOWED BELOW ASSIGNED AIRSPD WITHOUT ADVISING WHEN ENCOUNTERING UNEXPECTED TURB APCHING DEN, CO.

Narrative: ON DSCNT TO DEN, WE WERE ASKED FOR MAX FORWARD AIRSPD FOR SPACING. WE HIT MODERATE TURB AND SLOWED APPROX 40 KTS FOR 2-3 MINS. CTLR ASKED OUR SPD AND WE ADVISED WE HAD SLOWED. HE STATED WE SHOULD HAVE TOLD HIM WE WERE SLOWING EARLIER SO HE COULD PLAN ACCORDINGLY. I WAS PNF, CONDUCTING OPERATIONAL EXPERIENCE WITH A NEW FO. I WAS DISTR WITH SEATING PAX, FLT ATTENDANT AND PICKING UP ATIS.

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.