<< >> NASA ASRS Report 977151, October 2011

An incorrect altimeter setting provided by center contributed to an near midair collision between an sr-22 and a lear jet.

Attributes
ACN	977151
Time
Date	201110
Local Time Of Day	1201-1800
Place
Locale Reference	ZTL.ARTCC
State Reference	GA
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Make Model Name	SR22
Operating Under FAR Part	Part 135
Flight Phase	Cruise
Route In Use	Direct
Flight Plan	IFR
Aircraft 2
Make Model Name	Bombardier Learjet Undifferentiated or Other Model
Flight Phase	Climb
Flight Plan	IFR
Component
Aircraft Component	Altimeter
Person 1
Function	Pilot Flying Single Pilot
Qualification	Flight Crew Instrument Flight Crew Multiengine Flight Crew Commercial
Experience	Flight Crew Last 90 Days 21 Flight Crew Total 3290 Flight Crew Type 161
Events
Anomaly	ATC Issue All Types Conflict NMAC Deviation - Altitude Excursion From Assigned Altitude
Miss Distance	Horizontal 0 Vertical 400

Narrative:

Center advised an opposite direction lear jet and myself of one another. I was at 7;000 ft (in IMC) and the lear was held at 6;000 ft in his climb (also in IMC). The controller then gave us a local altimeter setting of 30.34; which I acknowledged and entered. His altimeter setting was a full inch higher than actual and required me to descend about 1;000 ft to correct back to 7;000 ft on my altimeter with the new setting. During the correction; the lear queried the controller and said his ATIS reported 29.34 as the correct altimeter setting. Center than asked my altitude while correcting the altimeter setting to 29.34. During the second correction; I received a traffic warning and picked up a hit on my nose 400 ft below my altitude. As a result of the back and forth; we had a 180 degree opposite direction pass; in IMC; with approximately 400 ft vertical separation.

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Original NASA ASRS Text

Title: An incorrect altimeter setting provided by Center contributed to an NMAC between an SR-22 and a Lear Jet.

Narrative: Center advised an opposite direction Lear Jet and myself of one another. I was at 7;000 FT (in IMC) and the Lear was held at 6;000 FT in his climb (also in IMC). The Controller then gave us a local altimeter setting of 30.34; which I acknowledged and entered. His altimeter setting was a full inch higher than actual and required me to descend about 1;000 FT to correct back to 7;000 FT on my altimeter with the new setting. During the correction; the Lear queried the Controller and said his ATIS reported 29.34 as the correct altimeter setting. Center than asked my altitude while correcting the altimeter setting to 29.34. During the second correction; I received a traffic warning and picked up a hit on my nose 400 FT below my altitude. As a result of the back and forth; we had a 180 degree opposite direction pass; in IMC; with approximately 400 FT vertical separation.

Data retrieved from NASA's ASRS site as of April 2012 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.