Medium large transport flight crew were asked to expedite climb through 8000'. Reported passing 8000' and controller asked for 'immediate' turn, then queried as to weight and climb speed.

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Attributes
ACN	124352
Time
Date	198910
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : iah
State Reference	TX
Altitude	msl bound lower : 8000 msl bound upper : 8000
Environment
Flight Conditions	Mixed
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : iah
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	climbout : intermediate altitude
Route In Use	enroute : on vectors
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial pilot : cfi pilot : atp pilot : flight engineer
Experience	flight time last 90 days : 75 flight time total : 6200 flight time type : 1100
ASRS Report	124352
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	non adherence : required legal separation
Independent Detector	other controllera other flight crewa
Resolutory Action	controller : issued new clearance
Consequence	Other
Miss Distance	horizontal : 8000 vertical : 1000
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

After departure from iah, iah departure control (119.7) cleared flight to 15,000, and issued a 020 degree heading to intercept the iah 341 radial. (This had been our original clearance.) upon intercepting the assigned radial and passing through 6000 MSL the controller asked us to expedite our climb through 8000'. Immediately, as pilot flying, I reduced the airspeed to produce a greater rate of climb. Upon reaching 8000' (just coming out of scattered clouds continuing our climb to 15,000), the captain reported to the controller that we had passed 8000 for 15,000. Just shortly after his transmission the controller asked for an 'immediate' turn to a 040 degree heading and then the controller issued traffic at 11-12 O'clock. The captain saw the traffic (an medium large transport) pass 1 to 2 mi off our left. Later the controller asked if we were heavy and if our weight had decreased our normal climb. His questioning of our weight and climb rate indicated to us that he had anticipated a greater climb rate.

Original NASA ASRS Text

Title: MLG FLT CREW WERE ASKED TO EXPEDITE CLIMB THROUGH 8000'. REPORTED PASSING 8000' AND CTLR ASKED FOR 'IMMEDIATE' TURN, THEN QUERIED AS TO WEIGHT AND CLIMB SPEED.

Narrative: AFTER DEP FROM IAH, IAH DEP CTL (119.7) CLRED FLT TO 15,000, AND ISSUED A 020 DEG HDG TO INTERCEPT THE IAH 341 RADIAL. (THIS HAD BEEN OUR ORIGINAL CLRNC.) UPON INTERCEPTING THE ASSIGNED RADIAL AND PASSING THROUGH 6000 MSL THE CTLR ASKED US TO EXPEDITE OUR CLIMB THROUGH 8000'. IMMEDIATELY, AS PLT FLYING, I REDUCED THE AIRSPEED TO PRODUCE A GREATER RATE OF CLIMB. UPON REACHING 8000' (JUST COMING OUT OF SCATTERED CLOUDS CONTINUING OUR CLIMB TO 15,000), THE CAPT REPORTED TO THE CTLR THAT WE HAD PASSED 8000 FOR 15,000. JUST SHORTLY AFTER HIS XMISSION THE CTLR ASKED FOR AN 'IMMEDIATE' TURN TO A 040 DEG HDG AND THEN THE CTLR ISSUED TFC AT 11-12 O'CLOCK. THE CAPT SAW THE TFC (AN MLG) PASS 1 TO 2 MI OFF OUR LEFT. LATER THE CTLR ASKED IF WE WERE HEAVY AND IF OUR WEIGHT HAD DECREASED OUR NORMAL CLIMB. HIS QUESTIONING OF OUR WEIGHT AND CLIMB RATE INDICATED TO US THAT HE HAD ANTICIPATED A GREATER CLIMB RATE.

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.