Aircraft climbed slow to requested altitude resulting in less than standard separation with another ...

Attributes
ACN	108033
Time
Date	198904
Day	Sat
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : rod
State Reference	OH
Altitude	msl bound lower : 35000 msl bound upper : 37000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zid
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	climbout : intermediate altitude
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 3 Turbojet Eng
Flight Phase	cruise other
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : radar
Qualification	controller : radar
Experience	controller non radar : 7 controller radar : 5
ASRS Report	108033
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 200 flight time total : 16000 flight time type : 200
ASRS Report	108029
Events
Anomaly	altitude deviation : undershoot conflict : airborne less severe non adherence : clearance
Independent Detector	other controllera
Resolutory Action	controller : issued new clearance other
Consequence	Other
Miss Distance	horizontal : 15000 vertical : 1500
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Air carrier a was wbound at FL350, air carrier B was northeast bound at FL330, requesting FL370 because of turbulence. I asked air carrier B how soon he could be level at FL370. He replied, '3 mins.' I had 4+ mins before sep would be lost. I climbed air carrier B to FL370. Approximately 2 1/2 mins later I asked air carrier B if he could be level at FL370 in a minute or less. He stated a minute and maybe a little more. 1 min, 10 seconds prior to loss of sep I issued a clearance to air carrier B to be level in 1 min. The pilot acknowledged the clearance, but did not reach FL370 for 2 mins. Sep was lost. The pilot never told me he could not meet his restriction. It took air carrier B 4 mins, 58 seconds to climb from FL330 to FL370, after he told me he could do it in 3 mins. Supplemental information from acn 108029: center cleared us to 37000' in 3 mins. We were very light and were climbing at 1500 FPM up to 36000'. We were unable to climb at more than 400 FPM above 36000'. Our weight at that time was about 112000#.

Original NASA ASRS Text

Title: ACFT CLIMBED SLOW TO REQUESTED ALT RESULTING IN LESS THAN STANDARD SEPARATION WITH ANOTHER ACFT.

Narrative: ACR A WAS WBOUND AT FL350, ACR B WAS NE BOUND AT FL330, REQUESTING FL370 BECAUSE OF TURB. I ASKED ACR B HOW SOON HE COULD BE LEVEL AT FL370. HE REPLIED, '3 MINS.' I HAD 4+ MINS BEFORE SEP WOULD BE LOST. I CLBED ACR B TO FL370. APPROX 2 1/2 MINS LATER I ASKED ACR B IF HE COULD BE LEVEL AT FL370 IN A MINUTE OR LESS. HE STATED A MINUTE AND MAYBE A LITTLE MORE. 1 MIN, 10 SECS PRIOR TO LOSS OF SEP I ISSUED A CLRNC TO ACR B TO BE LEVEL IN 1 MIN. THE PLT ACKNOWLEDGED THE CLRNC, BUT DID NOT REACH FL370 FOR 2 MINS. SEP WAS LOST. THE PLT NEVER TOLD ME HE COULD NOT MEET HIS RESTRICTION. IT TOOK ACR B 4 MINS, 58 SECS TO CLB FROM FL330 TO FL370, AFTER HE TOLD ME HE COULD DO IT IN 3 MINS. SUPPLEMENTAL INFO FROM ACN 108029: CENTER CLRED US TO 37000' IN 3 MINS. WE WERE VERY LIGHT AND WERE CLBING AT 1500 FPM UP TO 36000'. WE WERE UNABLE TO CLB AT MORE THAN 400 FPM ABOVE 36000'. OUR WT AT THAT TIME WAS ABOUT 112000#.

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.

Aircraft climbed slow to requested altitude resulting in less than standard separation with another aircraft.