Military Y flight non adherence to ATC clearance assigned altitude caused less than standard separation from air carrier X TCASII RA. Evasive action taken.

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Attributes
ACN	304090
Time
Date	199505
Day	Sat
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : rod
State Reference	OH
Altitude	msl bound lower : 28000 msl bound upper : 28400
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zob
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
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
Operator	other
Make Model Name	Hornet (F-18)
Operating Under FAR Part	other : other
Flight Phase	cruise other
Route In Use	enroute : on vectors
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 143 flight time total : 8538 flight time type : 4183
ASRS Report	304090
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	altitude deviation : excursion from assigned altitude conflict : airborne less severe non adherence : clearance non adherence : required legal separation
Independent Detector	aircraft equipment other aircraft equipment : unspecified
Resolutory Action	flight crew : took evasive action
Consequence	Other
Miss Distance	horizontal : 12000 vertical : 700
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Air carrier X during cruise at FL280 received a TA on the TCASII system and within 3-4 seconds it became an RA indicating a conflict. The TCASII system told us to climb. We initiated a climb to FL284 and advised center of the deviation. The traffic showed a 700 ft separation on the TCASII when we were at FL284 indicating the traffic's altitude at FL277. The traffic was military Y flight of 4 F18's. We did not receive any indication of a conflict from center prior to the incident. Center advised Y flight that their assigned flight level was FL270 and advised them of the conflict. At the time of the conflict we were on a westerly heading and the initial TA was at our 1 O'clock position showing 900 ft below our altitude. Additionally the TCASII showed them with a climbing vector. The Y flight passed within 2 mi on our scope aft of our aircraft, with 700 ft of separation. We were on the airway J149 inbound to rod VOR.

Original NASA ASRS Text

Title: MIL Y FLT NON ADHERENCE TO ATC CLRNC ASSIGNED ALT CAUSED LTSS FROM ACR X TCASII RA. EVASIVE ACTION TAKEN.

Narrative: ACR X DURING CRUISE AT FL280 RECEIVED A TA ON THE TCASII SYS AND WITHIN 3-4 SECONDS IT BECAME AN RA INDICATING A CONFLICT. THE TCASII SYS TOLD US TO CLB. WE INITIATED A CLB TO FL284 AND ADVISED CTR OF THE DEV. THE TFC SHOWED A 700 FT SEPARATION ON THE TCASII WHEN WE WERE AT FL284 INDICATING THE TFC'S ALT AT FL277. THE TFC WAS MIL Y FLT OF 4 F18'S. WE DID NOT RECEIVE ANY INDICATION OF A CONFLICT FROM CTR PRIOR TO THE INCIDENT. CTR ADVISED Y FLT THAT THEIR ASSIGNED FLT LEVEL WAS FL270 AND ADVISED THEM OF THE CONFLICT. AT THE TIME OF THE CONFLICT WE WERE ON A WESTERLY HDG AND THE INITIAL TA WAS AT OUR 1 O'CLOCK POS SHOWING 900 FT BELOW OUR ALT. ADDITIONALLY THE TCASII SHOWED THEM WITH A CLBING VECTOR. THE Y FLT PASSED WITHIN 2 MI ON OUR SCOPE AFT OF OUR ACFT, WITH 700 FT OF SEPARATION. WE WERE ON THE AIRWAY J149 INBOUND TO ROD VOR.

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.