<< >> NASA ASRS Report 611746, March 2004

ZID controller experienced less than standard separation during an emergency descent at FL280 between an LJ35 and an A320 in level flight below.

Attributes
ACN	611746
Time
Date	200403
Day	Sun
Local Time Of Day	1201 To 1800
Place
Locale Reference	navaid : vhp.vortac
State Reference	IN
Altitude	msl single value : 28000
Environment
Flight Conditions	VMC
Weather Elements	Turbulence
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zid.artcc
Operator	common carrier : air taxi
Make Model Name	Learjet 35
Operating Under FAR Part	Part 135
Flight Phase	descent : intermediate altitude
Flight Plan	IFR
Aircraft 2
Controlling Facilities	artcc : zid.artcc
Operator	common carrier : air carrier
Make Model Name	A320
Operating Under FAR Part	Part 121
Flight Phase	cruise : level
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : radar
Qualification	controller : radar
Experience	controller radar : 20
ASRS Report	611746
Person 2
Affiliation	government : faa
Function	controller : handoff position
Qualification	controller : radar
Experience	controller radar : 20
ASRS Report	611885
Events
Anomaly	aircraft equipment problem : critical altitude deviation : excursion from assigned altitude conflict : airborne less severe non adherence : clearance non adherence : required legal separation
Independent Detector	atc equipment : conflict alert other controllera
Resolutory Action	controller : issued advisory flight crew : took precautionary avoidance action flight crew : declared emergency
Miss Distance	horizontal : 7800 vertical : 100
Supplementary
Problem Areas	Aircraft ATC Human Performance Flight Crew Human Performance
Primary Problem	Aircraft

Narrative:

LJ35 at FL370 lost pressure and descended on own after declaring emergency. Traffic was A320 at FL280. Both pilots saw traffic. Lear continued to descend and landed. Supplemental information from acn 611885: the learjet lost pressure and declared emergency. He began a rapid descent and was asked to maintain an altitude and traffic was called. He said unable.

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Original NASA ASRS Text

Title: ZID CTLR EXPERIENCED LTSS DURING AN EMER DSCNT AT FL280 BTWN AN LJ35 AND AN A320 IN LEVEL FLT BELOW.

Narrative: LJ35 AT FL370 LOST PRESSURE AND DSNDED ON OWN AFTER DECLARING EMER. TFC WAS A320 AT FL280. BOTH PLTS SAW TFC. LEAR CONTINUED TO DSND AND LANDED. SUPPLEMENTAL INFO FROM ACN 611885: THE LEARJET LOST PRESSURE AND DECLARED EMER. HE BEGAN A RAPID DSCNT AND WAS ASKED TO MAINTAIN AN ALT AND TFC WAS CALLED. HE SAID UNABLE.

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.