Air carrier widebody transport in climb recleared to descend back below 10000' MSL and due to controller voice elected get down fast before slowing to 250 KTS before below 10000' MSL.

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Attributes
ACN	96101
Time
Date	198810
Day	Mon
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : tfd airport : phx
State Reference	AZ
Altitude	msl bound lower : 9000 msl bound upper : 10000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zab tracon : phx tower : fwa
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other
Flight Phase	climbout : intermediate altitude
Route In Use	departure other
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 : 15000 flight time type : 800
ASRS Report	96101
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	conflict : airborne less severe other anomaly other anomaly other
Independent Detector	other controllera other flight crewa
Resolutory Action	controller : issued new clearance other
Consequence	Other
Miss Distance	horizontal : 30000 vertical : 0
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Deviation Pilot Deviation other

Narrative:

During initial departure our altitude was restr to 10000' due to traffic. Upon leveling at 10000' I allowed our airspeed to increase to 320 KTS. Shortly thereafter departure control cleared us to climb to 16000'. Upon passing 10500' departure controller, in a confused voice, told us to stop climb and descend to 10000'. Very shortly thereafter we were instructed to descend to 9000' due to traffic at 10000' reported at 12 O'clock and 5 mi. Due to the unusual nature of the clrncs we received, I elected to descend below 10000' west/O reducing airspeed to 250 KTS. Upon leveling at 9000' I then reduced speed to comply with the far. Reported traffic was not seen and no additional reports filed. Callback conversation with reporter revealed the following: when queried, the controller reported that the altitude change was at the request of ARTCC so TRACON controller felt the center had traffic they hadn't coordinated with TRACON. PF felt by the controller conversation that they wanted aircraft down to 9000' quickly. So did not delay to reduce speed.

Original NASA ASRS Text

Title: ACR WDB IN CLIMB RECLEARED TO DESCEND BACK BELOW 10000' MSL AND DUE TO CTLR VOICE ELECTED GET DOWN FAST BEFORE SLOWING TO 250 KTS BEFORE BELOW 10000' MSL.

Narrative: DURING INITIAL DEP OUR ALT WAS RESTR TO 10000' DUE TO TFC. UPON LEVELING AT 10000' I ALLOWED OUR AIRSPD TO INCREASE TO 320 KTS. SHORTLY THEREAFTER DEP CTL CLRED US TO CLB TO 16000'. UPON PASSING 10500' DEP CTLR, IN A CONFUSED VOICE, TOLD US TO STOP CLB AND DSND TO 10000'. VERY SHORTLY THEREAFTER WE WERE INSTRUCTED TO DSND TO 9000' DUE TO TFC AT 10000' RPTED AT 12 O'CLOCK AND 5 MI. DUE TO THE UNUSUAL NATURE OF THE CLRNCS WE RECEIVED, I ELECTED TO DSND BELOW 10000' W/O REDUCING AIRSPD TO 250 KTS. UPON LEVELING AT 9000' I THEN REDUCED SPD TO COMPLY WITH THE FAR. RPTED TFC WAS NOT SEEN AND NO ADDITIONAL RPTS FILED. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING: WHEN QUERIED, THE CTLR RPTED THAT THE ALT CHANGE WAS AT THE REQUEST OF ARTCC SO TRACON CTLR FELT THE CENTER HAD TFC THEY HADN'T COORDINATED WITH TRACON. PF FELT BY THE CTLR CONVERSATION THAT THEY WANTED ACFT DOWN TO 9000' QUICKLY. SO DID NOT DELAY TO REDUCE SPD.

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.