Controller requests air carrier medium large transport to make immediate best rate of turn to avoid crossing traffic. In complying aircraft incurs altitude excursion. Operational deviation. Flight crew deviation.

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Attributes
ACN	105818
Time
Date	198902
Day	Sat
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : tbc
State Reference	AZ
Altitude	msl bound lower : 35000 msl bound upper : 35300
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zdv
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	cruise other
Route In Use	enroute airway : j76
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Experience	flight time last 90 days : 70 flight time total : 2800 flight time type : 300
ASRS Report	105818
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	altitude deviation : excursion from assigned altitude conflict : airborne less severe non adherence : clearance non adherence : far other anomaly other
Independent Detector	other controllera
Resolutory Action	controller : issued new clearance flight crew : returned to intended course or assigned course
Consequence	Other
Miss Distance	horizontal : 30000 vertical : 0
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Deviation Pilot Deviation

Narrative:

Center requested our aircraft to make in immediate right turn (our best rate) to avoid crossing traffic. While making the right turn the PF deviated off altitude by 300' (35300). The pilot immediately pushed the nose of the aircraft over to return to assigned altitude. To prevent this problem from recurring the controller could give the pilot a little more lead time to avoid crossing traffic and request standard rate of turn vice best rate of turn.

Original NASA ASRS Text

Title: CTLR REQUESTS ACR MLG TO MAKE IMMEDIATE BEST RATE OF TURN TO AVOID CROSSING TRAFFIC. IN COMPLYING ACFT INCURS ALT EXCURSION. OPDEV. FLT CREW DEVIATION.

Narrative: CENTER REQUESTED OUR ACFT TO MAKE IN IMMEDIATE RIGHT TURN (OUR BEST RATE) TO AVOID XING TFC. WHILE MAKING THE RIGHT TURN THE PF DEVIATED OFF ALT BY 300' (35300). THE PLT IMMEDIATELY PUSHED THE NOSE OF THE ACFT OVER TO RETURN TO ASSIGNED ALT. TO PREVENT THIS PROBLEM FROM RECURRING THE CTLR COULD GIVE THE PLT A LITTLE MORE LEAD TIME TO AVOID XING TFC AND REQUEST STANDARD RATE OF TURN VICE BEST RATE OF TURN.

Data retrieved from NASA's ASRS site as of August 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.