<< >> NASA ASRS Report 232005, January 1993

Controller reports a TCASII deviation by a commuter aircraft. Controller states that there was no traffic within 5 mi.

Attributes
ACN	232005
Time
Date	199301
Day	Mon
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : ord
State Reference	IL
Altitude	msl bound lower : 6700 msl bound upper : 7000
Environment
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : ord artcc : zma
Operator	common carrier : air carrier
Make Model Name	Medium Transport, High Wing, 2 Turboprop Eng
Flight Phase	cruise other
Route In Use	arrival other enroute : on vectors
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : approach
Qualification	controller : radar
ASRS Report	232005
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	altitude deviation : excursion from assigned altitude non adherence : clearance other anomaly other
Independent Detector	other controllera
Resolutory Action	other
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

While still outside descent area, air carrier X was observed descending below assigned altitude of 7000 ft. Controller advised aircraft to climb and maintain 7000 ft and the pilot responded 'we were responding to an RA. No traffic within 5 mi of aircraft was observed. There was an altitude deviation by air carrier X of 300 ft. There was communication regarding this TCASII maneuver, however, it was initiated by ATC and it was after the maneuver.

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Original NASA ASRS Text

Title: CTLR RPTS A TCASII DEV BY A COMMUTER ACFT. CTLR STATES THAT THERE WAS NO TFC WITHIN 5 MI.

Narrative: WHILE STILL OUTSIDE DSCNT AREA, ACR X WAS OBSERVED DSNDING BELOW ASSIGNED ALT OF 7000 FT. CTLR ADVISED ACFT TO CLB AND MAINTAIN 7000 FT AND THE PLT RESPONDED 'WE WERE RESPONDING TO AN RA. NO TFC WITHIN 5 MI OF ACFT WAS OBSERVED. THERE WAS AN ALTDEV BY ACR X OF 300 FT. THERE WAS COM REGARDING THIS TCASII MANEUVER, HOWEVER, IT WAS INITIATED BY ATC AND IT WAS AFTER THE MANEUVER.

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.