<< >> NASA ASRS Report 246169, July 1993

Altitude deviation altitude overshot excursion in descent. Potential conflict avoided by flight crew response to TCASII RA.

Attributes
ACN	246169
Time
Date	199307
Day	Wed
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : srq
State Reference	FL
Altitude	msl bound lower : 6800 msl bound upper : 7400
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : tpa
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	cruise other descent other
Route In Use	enroute : on vectors enroute : direct
Flight Plan	IFR
Aircraft 2
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Phase	cruise other
Flight Plan	VFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 200 flight time total : 14000 flight time type : 5000
ASRS Report	246169
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Events
Anomaly	altitude deviation : overshoot conflict : airborne less severe non adherence : clearance other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	flight crew : took evasive action flight crew : returned to intended course or assigned course
Consequence	Other
Miss Distance	horizontal : 0 vertical : 300
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

On descent to 5000 ft on approach to srq we were issued traffic 6500 ft, 12 O'clock. We were reclred to maintain 7000 ft. We had traffic 12 O'clock, 500 ft below us on TCASII. We were visually looking for traffic when a TCASII RA sounded 'climb, climb, climb.' PF immediately disconnected autoplt and cleared visually the airspace above us while smoothly adjusted the aircraft's vertical rate so as to keep the vsi needle just outside the red area of the vsi. We deviated from the assigned altitude of 7000 ft to around 7400 ft. TCASII sounded 'monitor vertical speed' then 'clear of conflict.' we notified ATC after we smoothly returned to assigned altitude per flight operations manual. At no time did we ever see traffic. TCASII showed traffic 300 ft low on warning.

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Original NASA ASRS Text

Title: ALTDEV ALT OVERSHOT EXCURSION IN DSCNT. POTENTIAL CONFLICT AVOIDED BY FLC RESPONSE TO TCASII RA.

Narrative: ON DSCNT TO 5000 FT ON APCH TO SRQ WE WERE ISSUED TFC 6500 FT, 12 O'CLOCK. WE WERE RECLRED TO MAINTAIN 7000 FT. WE HAD TFC 12 O'CLOCK, 500 FT BELOW US ON TCASII. WE WERE VISUALLY LOOKING FOR TFC WHEN A TCASII RA SOUNDED 'CLB, CLB, CLB.' PF IMMEDIATELY DISCONNECTED AUTOPLT AND CLRED VISUALLY THE AIRSPACE ABOVE US WHILE SMOOTHLY ADJUSTED THE ACFT'S VERT RATE SO AS TO KEEP THE VSI NEEDLE JUST OUTSIDE THE RED AREA OF THE VSI. WE DEVIATED FROM THE ASSIGNED ALT OF 7000 FT TO AROUND 7400 FT. TCASII SOUNDED 'MONITOR VERT SPD' THEN 'CLR OF CONFLICT.' WE NOTIFIED ATC AFTER WE SMOOTHLY RETURNED TO ASSIGNED ALT PER FLT OPS MANUAL. AT NO TIME DID WE EVER SEE TFC. TCASII SHOWED TFC 300 FT LOW ON WARNING.

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.