PA31 pilot was assigned 150 KTS to the OM at den runway 35L.

Attributes
ACN	491729
Time
Date	200011
Day	Fri
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : den.airport
State Reference	CO
Altitude	msl single value : 8000
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : d01.tracon
Operator	common carrier : air carrier
Make Model Name	PA-31 Navajo Chieftan/Mojave/Navajo T1020
Operating Under FAR Part	Part 135
Navigation In Use	ils localizer & glide slope : 35l
Flight Phase	descent : approach
Route In Use	approach : instrument precision
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : single pilot
Qualification	pilot : multi engine pilot : commercial pilot : cfi pilot : instrument
Experience	flight time last 90 days : 200 flight time total : 1225 flight time type : 45
ASRS Report	491729
Person 2
Affiliation	government : faa
Function	controller : approach
Qualification	controller : radar
Events
Anomaly	inflight encounter : weather other anomaly other anomaly other
Independent Detector	other controllera
Resolutory Action	controller : issued alert controller : issued new clearance other
Consequence	faa : reviewed incident with flight crew
Supplementary
Problem Areas	ATC Human Performance Flight Crew Human Performance Weather
Primary Problem	ATC Human Performance
Air Traffic Incident	Pilot Deviation other
Situations
ATC Facility	procedure or policy : d01.tracon

Narrative:

Approach control requested that I hold 150 KIAS to the OM. I held 150 KIAS. When I started to receive the audible tone for the OM, I began to reduce power to slow to my gear speed of 128 KIAS. Approach called to hold 150 KIAS. I sped back up. My previous instruction was to the marker. Something was not right. I spoke to TRACON on the ground and told them I could not hold 150 KIAS that long. I should have informed them sooner that I needed a slower speed. The controller was trying to expedite traffic and was simply assigning speeds that were too high.

Original NASA ASRS Text

Title: PA31 PLT WAS ASSIGNED 150 KTS TO THE OM AT DEN RWY 35L.

Narrative: APCH CTL REQUESTED THAT I HOLD 150 KIAS TO THE OM. I HELD 150 KIAS. WHEN I STARTED TO RECEIVE THE AUDIBLE TONE FOR THE OM, I BEGAN TO REDUCE PWR TO SLOW TO MY GEAR SPD OF 128 KIAS. APCH CALLED TO HOLD 150 KIAS. I SPED BACK UP. MY PREVIOUS INSTRUCTION WAS TO THE MARKER. SOMETHING WAS NOT RIGHT. I SPOKE TO TRACON ON THE GND AND TOLD THEM I COULD NOT HOLD 150 KIAS THAT LONG. I SHOULD HAVE INFORMED THEM SOONER THAT I NEEDED A SLOWER SPD. THE CTLR WAS TRYING TO EXPEDITE TFC AND WAS SIMPLY ASSIGNING SPDS THAT WERE TOO HIGH.

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.