Slow climbing large transport creates a problem for ARTCC radar controller and separation is lost.

Attributes
ACN	138027
Time
Date	199002
Day	Tue
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : zlc
State Reference	UT
Altitude	msl bound lower : 36300 msl bound upper : 37000
Environment
Flight Conditions	VMC
Light	Dawn
Aircraft 1
Controlling Facilities	artcc : zlc
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 3 Turbojet Eng
Flight Phase	climbout : intermediate altitude cruise other
Flight Plan	IFR
Aircraft 2
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Phase	cruise other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : flight engineer pilot : atp
Experience	flight time last 90 days : 180 flight time total : 10000 flight time type : 2000
ASRS Report	138027
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 160 flight time total : 20000 flight time type : 10000
ASRS Report	138024
Events
Anomaly	altitude deviation : undershoot conflict : airborne less severe non adherence : clearance non adherence : far non adherence : required legal separation other anomaly other
Independent Detector	other controllera
Resolutory Action	controller : issued new clearance flight crew : took evasive action other
Consequence	Other
Miss Distance	horizontal : 28000 vertical : 1300
Supplementary
Primary Problem	Ambiguous
Air Traffic Incident	Pilot Deviation Operational Error other

Narrative:

Climbing out of about 345 controller asked how long it would take to get to 370. I replied about 2-3 mins. Controller cleared us to climb to 370 to be level in 3 mins. We were climbing about 1500 FPM. At about FL363 controller asked for a right turn to 180 degree. We were slowed down to climb so I turned with as much bank angle as was safe. Controller came back and requested an immediate turn to 200 as he was unable to complete the handoff to denver. We turned as rapidly as possible while trying to keep the climb going. Because of the turn our climb rate dropped to 500 FPM. Had we continued straight ahead we would have been level at 370 well inside the original 3 min clearance. Conflict may have been caused by the computer lag as we were already out of 365 midway through the turn to 180 degree.

Original NASA ASRS Text

Title: SLOW CLIMBING LGT CREATES A PROBLEM FOR ARTCC RADAR CTLR AND SEPARATION IS LOST.

Narrative: CLIMBING OUT OF ABOUT 345 CTLR ASKED HOW LONG IT WOULD TAKE TO GET TO 370. I REPLIED ABOUT 2-3 MINS. CTLR CLRED US TO CLIMB TO 370 TO BE LEVEL IN 3 MINS. WE WERE CLIMBING ABOUT 1500 FPM. AT ABOUT FL363 CTLR ASKED FOR A RIGHT TURN TO 180 DEG. WE WERE SLOWED DOWN TO CLIMB SO I TURNED WITH AS MUCH BANK ANGLE AS WAS SAFE. CTLR CAME BACK AND REQUESTED AN IMMEDIATE TURN TO 200 AS HE WAS UNABLE TO COMPLETE THE HANDOFF TO DENVER. WE TURNED AS RAPIDLY AS POSSIBLE WHILE TRYING TO KEEP THE CLIMB GOING. BECAUSE OF THE TURN OUR CLIMB RATE DROPPED TO 500 FPM. HAD WE CONTINUED STRAIGHT AHEAD WE WOULD HAVE BEEN LEVEL AT 370 WELL INSIDE THE ORIGINAL 3 MIN CLRNC. CONFLICT MAY HAVE BEEN CAUSED BY THE COMPUTER LAG AS WE WERE ALREADY OUT OF 365 MIDWAY THROUGH THE TURN TO 180 DEG.

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.