Controller cleared a B747 to climb to FL370 without appropriate separation from a slower B757 2 mins ahead at FL370. After communication with the B747 by reporter, the B747 remained at FL330.

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Attributes
ACN	383414
Time
Date	199710
Day	Sun
Local Time Of Day	0001 To 0600
Place
Locale Reference	atc facility : tbt
State Reference	FO
Altitude	msl bound lower : 33000 msl bound upper : 37000
Environment
Light	Night
Aircraft 1
Controlling Facilities	artcc : sbph artcc : eggx
Operator	common carrier : air carrier
Make Model Name	B757 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	cruise other
Route In Use	enroute : other oceanic enroute airway : sbph
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	B747 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	cruise other
Route In Use	enroute : other oceanic
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 150 flight time total : 10000 flight time type : 3000
ASRS Report	383414
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	other anomaly other
Independent Detector	other flight crewa
Resolutory Action	other
Consequence	Other
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	other

Narrative:

Pv center cleared a B747, air carrier Y, to climb from FL330 to our altitude, FL370. The B747 was only 2 mins behind and much faster. I had to speak directly to air carrier Y on 134.15 to stop his climb. 5 mins later pv center asked air carrier Y to descend to FL330. Air carrier Y advised he never left FL330. Callback conversation with reporter revealed the following information: reporter stated the controller's english was very bad and hard to understand. Reporter was flying and flight conditions were VMC. Reporter indicated there have been similar occurrences of this nature before due to the language problem.

Original NASA ASRS Text

Title: CTLR CLRED A B747 TO CLB TO FL370 WITHOUT APPROPRIATE SEPARATION FROM A SLOWER B757 2 MINS AHEAD AT FL370. AFTER COM WITH THE B747 BY RPTR, THE B747 REMAINED AT FL330.

Narrative: PV CTR CLRED A B747, ACR Y, TO CLB FROM FL330 TO OUR ALT, FL370. THE B747 WAS ONLY 2 MINS BEHIND AND MUCH FASTER. I HAD TO SPEAK DIRECTLY TO ACR Y ON 134.15 TO STOP HIS CLB. 5 MINS LATER PV CTR ASKED ACR Y TO DSND TO FL330. ACR Y ADVISED HE NEVER LEFT FL330. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR STATED THE CTLR'S ENGLISH WAS VERY BAD AND HARD TO UNDERSTAND. RPTR WAS FLYING AND FLT CONDITIONS WERE VMC. RPTR INDICATED THERE HAVE BEEN SIMILAR OCCURRENCES OF THIS NATURE BEFORE DUE TO THE LANGUAGE PROB.

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.