B757 maintaining FL250 copied clearance to climb FL370. Out of FL280 TCASII gave yellow alert. Queried controller as to traffic as TCASII changed to red. Began a manual descent. Controller called and said maintain FL270 which was the original clearance. First officer out of the cockpit at the time of incident.

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Attributes
ACN	355260
Time
Date	199612
Day	Tue
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : bkw
State Reference	WV
Altitude	msl bound lower : 25000 msl bound upper : 30400
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zdc
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 : direct
Flight Plan	IFR
Aircraft 2
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Operating Under FAR Part	other : unknown
Flight Phase	cruise 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 : 186 flight time total : 17483 flight time type : 2504
ASRS Report	355260
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp pilot : commercial pilot : flight engineer pilot : instrument
Experience	flight time last 90 days : 181 flight time total : 11000
ASRS Report	355263
Events
Anomaly	altitude deviation : overshoot conflict : airborne less severe non adherence : required legal separation other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other controllera
Resolutory Action	flight crew : returned to intended course or assigned course other
Consequence	Other
Miss Distance	horizontal : 24000 vertical : 600
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

We were level at FL250 and the copilot left the cockpit to use the lavatory. ZDC cleared me to climb to FL370. I read back the clearance and entered FL370 into the autoplt. Leaving FL288 the TCASII gave a yellow alert. I called center and advised him of the traffic. The TCASII changed to red so I disengaged the autoplt and then followed the descent commands. Center called back and said to descend to FL270. The copilot returned to the cockpit and set the autoplt altitude command window to FL270 and assisted with the radio. Supplemental information from acn 355271: issued an altitude clearance to climb and maintain FL270. The pilot read the clearance back correctly. When leaving FL304, the radar controller issued a descent clearance to FL270.

Original NASA ASRS Text

Title: B757 MAINTAINING FL250 COPIED CLRNC TO CLB FL370. OUT OF FL280 TCASII GAVE YELLOW ALERT. QUERIED CTLR AS TO TFC AS TCASII CHANGED TO RED. BEGAN A MANUAL DSCNT. CTLR CALLED AND SAID MAINTAIN FL270 WHICH WAS THE ORIGINAL CLRNC. FO OUT OF THE COCKPIT AT THE TIME OF INCIDENT.

Narrative: WE WERE LEVEL AT FL250 AND THE COPLT LEFT THE COCKPIT TO USE THE LAVATORY. ZDC CLRED ME TO CLB TO FL370. I READ BACK THE CLRNC AND ENTERED FL370 INTO THE AUTOPLT. LEAVING FL288 THE TCASII GAVE A YELLOW ALERT. I CALLED CTR AND ADVISED HIM OF THE TFC. THE TCASII CHANGED TO RED SO I DISENGAGED THE AUTOPLT AND THEN FOLLOWED THE DSCNT COMMANDS. CTR CALLED BACK AND SAID TO DSND TO FL270. THE COPLT RETURNED TO THE COCKPIT AND SET THE AUTOPLT ALT COMMAND WINDOW TO FL270 AND ASSISTED WITH THE RADIO. SUPPLEMENTAL INFO FROM ACN 355271: ISSUED AN ALT CLRNC TO CLB AND MAINTAIN FL270. THE PLT READ THE CLRNC BACK CORRECTLY. WHEN LEAVING FL304, THE RADAR CTLR ISSUED A DSCNT CLRNC TO FL270.

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.