Flight crew climbed above assigned altitude in response to a TCASII caused by another aircraft climbing above assigned below their altitude (bump up).

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Attributes
ACN	374091
Time
Date	199707
Day	Tue
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : ldn
State Reference	VA
Altitude	msl bound lower : 27000 msl bound upper : 27500
Environment
Flight Conditions	VMC
Light	Dusk
Aircraft 1
Controlling Facilities	artcc : zdc tower : jfk
Operator	common carrier : air carrier
Make Model Name	MD-80 Super 80
Operating Under FAR Part	Part 121
Navigation In Use	Other
Flight Phase	cruise other
Flight Plan	IFR
Aircraft 2
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Operating Under FAR Part	other : unknown
Flight Phase	climbout : intermediate altitude
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
ASRS Report	374091
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
ASRS Report	373930
Events
Anomaly	altitude deviation : excursion from assigned altitude non adherence : clearance other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	flight crew : returned to intended course or assigned course flight crew : took evasive action
Consequence	Other
Miss Distance	vertical : 1500
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

We were level at FL270. Aircraft showing on TCASII directly below us, climbing. TCASII issued an RA and commanded 1000- 1500 climb. I smoothly complied while captain notified ATC we were complying with a TCASII warning. At FL275 TCASII RA cleared and we descended back to FL270. ATC stated that the other aircraft never climbed above FL260.

Original NASA ASRS Text

Title: FLC CLBED ABOVE ASSIGNED ALT IN RESPONSE TO A TCASII CAUSED BY ANOTHER ACFT CLBING ABOVE ASSIGNED BELOW THEIR ALT (BUMP UP).

Narrative: WE WERE LEVEL AT FL270. ACFT SHOWING ON TCASII DIRECTLY BELOW US, CLBING. TCASII ISSUED AN RA AND COMMANDED 1000- 1500 CLB. I SMOOTHLY COMPLIED WHILE CAPT NOTIFIED ATC WE WERE COMPLYING WITH A TCASII WARNING. AT FL275 TCASII RA CLRED AND WE DSNDED BACK TO FL270. ATC STATED THAT THE OTHER ACFT NEVER CLBED ABOVE FL260.

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.