Flight crew of B735 both heard, read back, and verified cleared to FL290. Experienced TCASII TA out of FL274, and were advised by ATC they were cleared only to FL270.

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Attributes
ACN	580341
Time
Date	200304
Day	Tue
Local Time Of Day	1201 To 1800
Place
State Reference	AZ
Altitude	msl bound lower : 27400 msl bound upper : 29000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zab.artcc
Operator	common carrier : air carrier
Make Model Name	B757-300
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	climbout : intermediate altitude
Route In Use	departure sid : silow
Flight Plan	IFR
Aircraft 2
Controlling Facilities	artcc : zab.artcc
Make Model Name	Commercial Fixed Wing
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 200 flight time total : 11000 flight time type : 4000
ASRS Report	580341
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : instrument pilot : multi engine pilot : atp pilot : commercial pilot : flight engineer
Experience	flight time last 90 days : 100 flight time total : 12600 flight time type : 5500
ASRS Report	580342
Events
Anomaly	conflict : airborne less severe non adherence : far non adherence : clearance
Independent Detector	aircraft equipment : tcas other controllera
Resolutory Action	controller : issued new clearance controller : issued alert flight crew : took precautionary avoidance action flight crew : returned to assigned altitude
Consequence	faa : reviewed incident with flight crew
Miss Distance	horizontal : 12000 vertical : 1600
Supplementary
Problem Areas	ATC Human Performance Flight Crew Human Performance
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

Climbing out of phx on silow 1 departure, both pilots heard ATC clear us 'direct to inw, climb and maintain FL290.' first officer set FL290 in MCP and stated 'FL290.' captain confirmed 'FL290.' passing approximately FL274, we received a TCASII TA for an aircraft 400 ft above us and about 3 mi at 11 O'clock position. ATC asked us to confirm FL270. Captain stated to ATC that we were climbing to FL290. ATC then gave us a turn to the right. First officer started a descent to FL270. ATC stated that we were cleared only to FL270, and that we read back FL270. We saw aircraft pass off the left approximately 2 mi away. ATC said to continue to climb to FL290, and cleared us back direct inw.

Original NASA ASRS Text

Title: FLT CREW OF B735 BOTH HEARD, READ BACK, AND VERIFIED CLRED TO FL290. EXPERIENCED TCASII TA OUT OF FL274, AND WERE ADVISED BY ATC THEY WERE CLRED ONLY TO FL270.

Narrative: CLBING OUT OF PHX ON SILOW 1 DEP, BOTH PLTS HEARD ATC CLR US 'DIRECT TO INW, CLB AND MAINTAIN FL290.' FO SET FL290 IN MCP AND STATED 'FL290.' CAPT CONFIRMED 'FL290.' PASSING APPROX FL274, WE RECEIVED A TCASII TA FOR AN ACFT 400 FT ABOVE US AND ABOUT 3 MI AT 11 O'CLOCK POS. ATC ASKED US TO CONFIRM FL270. CAPT STATED TO ATC THAT WE WERE CLBING TO FL290. ATC THEN GAVE US A TURN TO THE R. FO STARTED A DSCNT TO FL270. ATC STATED THAT WE WERE CLRED ONLY TO FL270, AND THAT WE READ BACK FL270. WE SAW ACFT PASS OFF THE L APPROX 2 MI AWAY. ATC SAID TO CONTINUE TO CLB TO FL290, AND CLRED US BACK DIRECT INW.

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.