Military jet emergency descent had less than standard separation from air carrier Y.

Attributes
ACN	315706
Time
Date	199509
Day	Wed
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : ldn
State Reference	VA
Altitude	msl bound lower : 24000 msl bound upper : 24000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zdc tower : mco
Operator	other
Make Model Name	Learjet 35
Operating Under FAR Part	Part 91
Flight Phase	climbout : intermediate altitude descent other
Route In Use	enroute : direct
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	MD-80 Super 80
Operating Under FAR Part	Part 121
Navigation In Use	Other
Flight Phase	climbout : intermediate altitude cruise other
Route In Use	enroute : direct
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : radar
Qualification	controller : radar
Experience	controller radar : 27
ASRS Report	315706
Person 2
Affiliation	government : military
Function	flight crew : captain oversight : pic
Qualification	pilot : military
Events
Anomaly	aircraft equipment problem : less severe conflict : airborne less severe non adherence : required legal separation other anomaly other
Independent Detector	other flight crewa
Resolutory Action	flight crew : declared emergency other
Consequence	Other
Miss Distance	horizontal : 22200 vertical : 300
Supplementary
Primary Problem	Aircraft

Narrative:

Military learjet climbing to FL270 requested descent back to FL250. 2 mi behind lear was an air carrier Y MD80 climbing to FL260. Stopped aircraft at FL240 and descended lear to FL250. Upon reaching FL250 lear reported further problems and emergency descent to 10000 ft. Told lear to wait a second while I turned Y and called lear traffic to him. Y turned and had lear in sight. I then had 3-4 mi target separation and diverging targets and descended lear to 10000 ft and turned to 090 degree vector back to andrews AFB, md. Lear landed safely. Callback conversation with reporter revealed the following information: reporter stated the lear flight crew declared an emergency due to pressurization problems. Reporter was complimented on his handling of the emergency.

Original NASA ASRS Text

Title: MIL JET EMER DSCNT HAD LTSS FROM ACR Y.

Narrative: MIL LEARJET CLBING TO FL270 REQUESTED DSCNT BACK TO FL250. 2 MI BEHIND LEAR WAS AN ACR Y MD80 CLBING TO FL260. STOPPED ACFT AT FL240 AND DSNDED LEAR TO FL250. UPON REACHING FL250 LEAR RPTED FURTHER PROBS AND EMER DSCNT TO 10000 FT. TOLD LEAR TO WAIT A SECOND WHILE I TURNED Y AND CALLED LEAR TFC TO HIM. Y TURNED AND HAD LEAR IN SIGHT. I THEN HAD 3-4 MI TARGET SEPARATION AND DIVERGING TARGETS AND DSNDED LEAR TO 10000 FT AND TURNED TO 090 DEG VECTOR BACK TO ANDREWS AFB, MD. LEAR LANDED SAFELY. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR STATED THE LEAR FLC DECLARED AN EMER DUE TO PRESSURIZATION PROBS. RPTR WAS COMPLIMENTED ON HIS HANDLING OF THE EMER.

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.