Aircraft lost 200 ft during a test flight.

Attributes
ACN	239940
Time
Date	199304
Day	Fri
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : vuz
State Reference	AL
Altitude	msl bound lower : 24800 msl bound upper : 25000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zme
Operator	general aviation : corporate
Make Model Name	Light Transport, Low Wing, 2 Turbojet Eng
Flight Phase	cruise other
Route In Use	enroute airway : j14
Flight Plan	IFR
Person 1
Affiliation	Other
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 100 flight time total : 8900 flight time type : 500
ASRS Report	239940
Person 2
Affiliation	Other
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	aircraft equipment problem : critical altitude deviation : excursion from assigned altitude non adherence : clearance
Independent Detector	other flight crewa
Resolutory Action	controller : issued new clearance other
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	Pilot Deviation

Narrative:

We were doing an engine data flight on an IFR flight plan. During an idle determination test we slowed from 250 KTS to 1.2 vs at FL250. Upon reaching 1.2 vs the #1 engine failed to respond to power lever inputs. Being on the back side of the power curve we were unable to maintain FL250. ZME was slow in grasping our situation and in getting us a lower altitude. We had descended to FL248 or so by the time we received a descent clearance.

Original NASA ASRS Text

Title: ACFT LOST 200 FT DURING A TEST FLT.

Narrative: WE WERE DOING AN ENG DATA FLT ON AN IFR FLT PLAN. DURING AN IDLE DETERMINATION TEST WE SLOWED FROM 250 KTS TO 1.2 VS AT FL250. UPON REACHING 1.2 VS THE #1 ENG FAILED TO RESPOND TO PWR LEVER INPUTS. BEING ON THE BACK SIDE OF THE PWR CURVE WE WERE UNABLE TO MAINTAIN FL250. ZME WAS SLOW IN GRASPING OUR SIT AND IN GETTING US A LOWER ALT. WE HAD DSNDED TO FL248 OR SO BY THE TIME WE RECEIVED A DSCNT CLRNC.

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.