Captain of an medium large transport lost 300 ft of altitude while making quick turn to comply with approach controller heading change for traffic separation.

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Attributes
ACN	515423
Time
Date	200106
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : cle.airport
State Reference	OH
Altitude	msl single value : 10000
Environment
Flight Conditions	Marginal
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zob.artcc
Operator	common carrier : air carrier
Make Model Name	Medium Transport, Low Wing, 2 Turbojet Eng
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	descent : intermediate altitude
Route In Use	arrival : on vectors
Flight Plan	IFR
Aircraft 2
Controlling Facilities	artcc : zob.artcc
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : flight engineer
Experience	flight time last 90 days : 130 flight time total : 10000 flight time type : 3000
ASRS Report	515423
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 180 flight time total : 10000 flight time type : 1200
ASRS Report	515431
Events
Anomaly	altitude deviation : excursion from assigned altitude conflict : airborne less severe non adherence : clearance non adherence : required legal separation
Independent Detector	aircraft equipment : tcas other flight crewa
Resolutory Action	controller : separated traffic
Consequence	faa : reviewed incident with flight crew
Supplementary
Problem Areas	ATC Human Performance Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Near keatn intersection inbound to cle, ATC was questioning commuter aircraft about their altitude. About that time we got a TCASII alert -- sound of controller voice and immediate heading given to us of 360 degrees from a 310 degree heading caused me to react quickly. I executed a 45 degree bank turn but lost 300 ft while turning. If I were to make a steep bank turn in the future, I will turn off my flight director.

Original NASA ASRS Text

Title: CAPT OF AN MLG LOST 300 FT OF ALT WHILE MAKING QUICK TURN TO COMPLY WITH APCH CTLR HDG CHANGE FOR TFC SEPARATION.

Narrative: NEAR KEATN INTXN INBOUND TO CLE, ATC WAS QUESTIONING COMMUTER ACFT ABOUT THEIR ALT. ABOUT THAT TIME WE GOT A TCASII ALERT -- SOUND OF CTLR VOICE AND IMMEDIATE HDG GIVEN TO US OF 360 DEGS FROM A 310 DEG HDG CAUSED ME TO REACT QUICKLY. I EXECUTED A 45 DEG BANK TURN BUT LOST 300 FT WHILE TURNING. IF I WERE TO MAKE A STEEP BANK TURN IN THE FUTURE, I WILL TURN OFF MY FLT DIRECTOR.

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.