Air carrier X unauthorized descent through assigned altitude had less than standard separation from air carrier Y. Air carrier Y TCASII RA unauthorized descent from assigned altitude. Pilot deviation.

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Attributes
ACN	198652
Time
Date	199201
Day	Wed
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : iiu
State Reference	KY
Altitude	msl bound lower : 27800 msl bound upper : 29000
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zid
Operator	common carrier : air carrier
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Phase	descent other
Route In Use	enroute : direct
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Phase	cruise other descent other
Route In Use	enroute : direct
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : radar
Qualification	controller : radar
Experience	controller radar : 1
ASRS Report	198652
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	altitude deviation : excursion from assigned altitude altitude deviation : overshoot conflict : airborne less severe non adherence : required legal separation non adherence : clearance
Independent Detector	atc equipment other atc equipment : unspecified other controllera
Resolutory Action	flight crew : returned to intended course or assigned course other
Consequence	Other
Miss Distance	horizontal : 24000 vertical : 700
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Air carrier X was descending to FL290. He needed to get down to FL240 as he was an arrival. Air carrier X had air carrier Y at FL280 in sight. I pointed out air carrier Y to air carrier X. I started to point out traffic to air carrier Y who wanted FL270, but had traffic at FL270 (air carrier Z). As I was pointing out his traffic, I noticed air carrier X altitude of FL287. I immediately asked his altitude. He reported he was level at FL290. Adep went off between air carrier X and Y. Next, I see air carrier Y altitude at FL278. I asked him to verify level at FL280 and he replied he had a TCASII alert and was descending. I immediately told him that air carrier X above him was level at FL290 and to climb back up to FL280. The adep did not go off between air carrier Y and air carrier Z as there was about 5-6 mi separation.

Original NASA ASRS Text

Title: ACR X UNAUTHORIZED DSCNT THROUGH ASSIGNED ALT HAD LTSS FROM ACR Y. ACR Y TCASII RA UNAUTHORIZED DSCNT FROM ASSIGNED ALT. PLTDEV.

Narrative: ACR X WAS DSNDING TO FL290. HE NEEDED TO GET DOWN TO FL240 AS HE WAS AN ARR. ACR X HAD ACR Y AT FL280 IN SIGHT. I POINTED OUT ACR Y TO ACR X. I STARTED TO POINT OUT TFC TO ACR Y WHO WANTED FL270, BUT HAD TFC AT FL270 (ACR Z). AS I WAS POINTING OUT HIS TFC, I NOTICED ACR X ALT OF FL287. I IMMEDIATELY ASKED HIS ALT. HE RPTED HE WAS LEVEL AT FL290. ADEP WENT OFF BTWN ACR X AND Y. NEXT, I SEE ACR Y ALT AT FL278. I ASKED HIM TO VERIFY LEVEL AT FL280 AND HE REPLIED HE HAD A TCASII ALERT AND WAS DSNDING. I IMMEDIATELY TOLD HIM THAT ACR X ABOVE HIM WAS LEVEL AT FL290 AND TO CLB BACK UP TO FL280. THE ADEP DID NOT GO OFF BTWN ACR Y AND ACR Z AS THERE WAS ABOUT 5-6 MI SEPARATION.

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.