<< >> NASA ASRS Report 260651, January 1994

Flight crew of an medium large transport air carrier aircraft descended below assigned descent altitude resulting in a TCASII alert of other conflicting traffic and the controller intervening to issue evasive action instructions to the reporting aircraft.

Attributes
ACN	260651
Time
Date	199401
Day	Mon
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : lax
State Reference	CA
Altitude	msl bound lower : 4000 msl bound upper : 4800
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : lax
Operator	common carrier : air carrier
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	descent other
Flight Plan	IFR
Aircraft 2
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Phase	descent : approach
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 240 flight time total : 5000
ASRS Report	260651
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	altitude deviation : overshoot conflict : airborne less severe non adherence : clearance
Independent Detector	other controllera
Resolutory Action	controller : issued new clearance flight crew : took evasive action other
Consequence	Other
Miss Distance	vertical : 1000
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

We were cleared heading 160 degrees (base leg) descend and maintain 4000 ft. We were north of field for a right base to runway 25L. We were crossing over traffic landing runway 24R. Approaching 4000 ft we received a TA with instructions to climb. Controller said he had cleared us to 5000 ft. We were about 4800 ft when clear of traffic and then turned a slow final for visual to runway 25L. I believe, the sole problem was that the controller did not realize that he had cleared us to 4000 ft.

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Original NASA ASRS Text

Title: FLC OF AN MLG ACR ACFT DSNDED BELOW ASSIGNED DSCNT ALT RESULTING IN A TCASII ALERT OF OTHER CONFLICTING TFC AND THE CTLR INTERVENING TO ISSUE EVASIVE ACTION INSTRUCTIONS TO THE RPTING ACFT.

Narrative: WE WERE CLRED HDG 160 DEGS (BASE LEG) DSND AND MAINTAIN 4000 FT. WE WERE N OF FIELD FOR A R BASE TO RWY 25L. WE WERE XING OVER TFC LNDG RWY 24R. APCHING 4000 FT WE RECEIVED A TA WITH INSTRUCTIONS TO CLB. CTLR SAID HE HAD CLRED US TO 5000 FT. WE WERE ABOUT 4800 FT WHEN CLR OF TFC AND THEN TURNED A SLOW FINAL FOR VISUAL TO RWY 25L. I BELIEVE, THE SOLE PROB WAS THAT THE CTLR DID NOT REALIZE THAT HE HAD CLRED US TO 4000 FT.

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.