Air carrier X climb through occupied altitude was in conflict with B727.

Attributes
ACN	309530
Time
Date	199507
Day	Wed
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : dfw
State Reference	TX
Altitude	msl bound lower : 19500 msl bound upper : 19500
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zfw
Operator	common carrier : air carrier
Make Model Name	MD-90 Series (DC-9-90) Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	climbout : intermediate altitude
Route In Use	enroute : direct
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	B727 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	cruise other
Route In Use	enroute : direct
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 200 flight time total : 12000 flight time type : 4000
ASRS Report	309530
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Experience	flight time last 90 days : 160 flight time total : 5070 flight time type : 3670
ASRS Report	309973
Events
Anomaly	conflict : airborne less severe
Independent Detector	other controllera
Resolutory Action	controller : issued new clearance other
Consequence	Other
Miss Distance	horizontal : 30000 vertical : 500
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	other

Narrative:

Air carrier X climbing swbound with clearance to FL270. ZFW suddenly asked us to stop our climb at FL190 and turn right to 300 degrees. (We were passing FL195 at the time of his request.) I immediately selected altitude hold on the flight guidance panel and began a 30 degree bank turn to 300 degrees. The controller told us that a B727 was south of us and was climbing and looked slower than we were. He indicated that he had thought he told us to stop our climb at FL170. Our clearance was to FL270 and neither crew member heard any directive to amend the altitude clearance.

Original NASA ASRS Text

Title: ACR X CLB THROUGH OCCUPIED ALT WAS IN CONFLICT WITH B727.

Narrative: ACR X CLBING SWBOUND WITH CLRNC TO FL270. ZFW SUDDENLY ASKED US TO STOP OUR CLB AT FL190 AND TURN R TO 300 DEGS. (WE WERE PASSING FL195 AT THE TIME OF HIS REQUEST.) I IMMEDIATELY SELECTED ALT HOLD ON THE FLT GUIDANCE PANEL AND BEGAN A 30 DEG BANK TURN TO 300 DEGS. THE CTLR TOLD US THAT A B727 WAS S OF US AND WAS CLBING AND LOOKED SLOWER THAN WE WERE. HE INDICATED THAT HE HAD THOUGHT HE TOLD US TO STOP OUR CLB AT FL170. OUR CLRNC WAS TO FL270 AND NEITHER CREW MEMBER HEARD ANY DIRECTIVE TO AMEND THE ALT CLRNC.

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.