<< >> NASA ASRS Report 206793, April 1992

Altitude deviation.

Attributes
ACN	206793
Time
Date	199204
Day	Sun
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : mem
State Reference	TN
Altitude	msl bound lower : 4700 msl bound upper : 5000
Environment
Flight Conditions	Marginal
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : mem tower : sbn
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	climbout : intermediate altitude cruise other
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	cruise other descent other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : cfi pilot : commercial pilot : instrument
Experience	flight time last 90 days : 15 flight time total : 10000 flight time type : 6000
ASRS Report	206793
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp pilot : instrument pilot : flight engineer pilot : commercial
Experience	flight time last 90 days : 240 flight time total : 5000 flight time type : 1600
ASRS Report	206626
Events
Anomaly	altitude deviation : excursion from assigned altitude conflict : airborne less severe non adherence : clearance other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified
Resolutory Action	flight crew : took evasive action
Consequence	Other
Miss Distance	horizontal : 0 vertical : 600
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Departed mem-phl level at 5000 ft. Departure called traffic at 10 O'clock descending to 600 ft. TCASII issued a 'descend' command at 2000 FPM indication while displaying traffic at 10 O'clock closing and only 300 ft separation. Flight condition was VFR, but restr visibility due to haze/inversion. We immediately started descent with no visual contact and notified mem departure we were in conflict and descending. At 4800 ft command ceased and we stopped descent at 4700 ft. Notified ATC we were climbing back to 5000 ft. Mem ATC said that only traffic they showed was just passing overhead at 8500 ft descending.

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Original NASA ASRS Text

Title: ALTDEV.

Narrative: DEPARTED MEM-PHL LEVEL AT 5000 FT. DEP CALLED TFC AT 10 O'CLOCK DSNDING TO 600 FT. TCASII ISSUED A 'DSND' COMMAND AT 2000 FPM INDICATION WHILE DISPLAYING TFC AT 10 O'CLOCK CLOSING AND ONLY 300 FT SEPARATION. FLT CONDITION WAS VFR, BUT RESTR VISIBILITY DUE TO HAZE/INVERSION. WE IMMEDIATELY STARTED DSCNT WITH NO VISUAL CONTACT AND NOTIFIED MEM DEP WE WERE IN CONFLICT AND DSNDING. AT 4800 FT COMMAND CEASED AND WE STOPPED DSCNT AT 4700 FT. NOTIFIED ATC WE WERE CLBING BACK TO 5000 FT. MEM ATC SAID THAT ONLY TFC THEY SHOWED WAS JUST PASSING OVERHEAD AT 8500 FT DSNDING.

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.