Clearance to 7000 received and acknowledged. Controller meant to assign 8000. Less than standard sep...

Attributes
ACN	87097
Time
Date	198805
Day	Tue
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : pit
State Reference	PA
Altitude	msl bound lower : 6800 msl bound upper : 7500
Environment
Flight Conditions	VMC
Light	Dusk
Aircraft 1
Controlling Facilities	tracon : pit
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 3 Turbojet Eng
Flight Phase	descent : approach descent other
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Small Transport, Low Wing, 2 Turboprop Eng
Flight Phase	descent other
Flight Plan	IFR
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 : 25000
ASRS Report	87097
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 125 flight time total : 23000
ASRS Report	87413
Events
Anomaly	conflict : airborne less severe non adherence : required legal separation
Independent Detector	other controllera
Resolutory Action	controller : issued new clearance other
Consequence	Other
Miss Distance	vertical : 700
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

Pittsburgh approach control, approach clrd our flight to 7000', which I read back as 7000'. Leaving 7700' approach called and said he had clrd us to 8000'. All 3 crew members confirmed we had been clrd to 7000'. I replied that 'I read back 7000''. He said we had traffic approaching our 12 O'clock position descending out of 7000' and we were to remain at 7500', which we did. At about that time we saw the traffic and replied so. Approach said at that time the traffic was descending out of 6800'. There was no further incident.

Original NASA ASRS Text

Title: CLRNC TO 7000 RECEIVED AND ACKNOWLEDGED. CTLR MEANT TO ASSIGN 8000. LESS THAN STANDARD SEPARATION.

Narrative: PITTSBURGH APCH CTL, APCH CLRD OUR FLT TO 7000', WHICH I READ BACK AS 7000'. LEAVING 7700' APCH CALLED AND SAID HE HAD CLRD US TO 8000'. ALL 3 CREW MEMBERS CONFIRMED WE HAD BEEN CLRD TO 7000'. I REPLIED THAT 'I READ BACK 7000''. HE SAID WE HAD TFC APCHING OUR 12 O'CLOCK POSITION DSNDING OUT OF 7000' AND WE WERE TO REMAIN AT 7500', WHICH WE DID. AT ABOUT THAT TIME WE SAW THE TFC AND REPLIED SO. APCH SAID AT THAT TIME THE TFC WAS DSNDING OUT OF 6800'. THERE WAS NO FURTHER INCIDENT.

Data retrieved from NASA's ASRS site as of August 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.

Clearance to 7000 received and acknowledged. Controller meant to assign 8000. Less than standard separation.