Setting the wrong altimeter setting on descent caused the flight crew of a ce-750 to lose separation...

Attributes
ACN	941349
Time
Date	201104
Local Time Of Day	1201-1800
Place
Locale Reference	ZNY.ARTCC
State Reference	NY
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	Cessna Citation Undifferentiated or Other Model
Operating Under FAR Part	Part 91
Flight Phase	Descent
Flight Plan	IFR
Aircraft 2
Make Model Name	Regional Jet CL65 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	Cruise
Component
Aircraft Component	Altimeter
Person 1
Function	Pilot Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Person 2
Function	Pilot Not Flying Captain
Qualification	Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	Aircraft Equipment Problem Critical Conflict Airborne Conflict Deviation - Procedural Clearance Deviation - Procedural Published Material / Policy

Narrative:

We were cleared to descend to 14;000 ft while in a holding pattern. Descending through FL180 we set the altimeter to the local setting. The local altimeter setting was noted on the clipboard as 29.94. However the correct altimeter setting was 29.34. A crj was ahead of us was leveled at 13;000 ft following the same clearance about 1/2 mile ahead of us. Upon reaching 14;300 ft we received an RA stating 'monitor vertical speed'. I disconnected the autopilot and adjusted the flight path to remain in the TCAS command bars. We notified ATC of the deviation and RA compliance.ATC queried the crj about their altitude and they confirmed that they had received an RA as well and that they were level at 13;000 ft at the time of the advisory. Upon hearing this we checked the altimeter setting in the afis and noted the discrepancy. We corrected the altimeter setting to 29.63 then climbed and leveled at 14;000 ft. In the future I will exercise more caution in verifying the correct altimeter setting.

Original NASA ASRS Text

Title: Setting the wrong altimeter setting on descent caused the flight crew of a CE-750 to lose separation with another arrival intended to be 1;000 FT below them. A TCAS RA resulted and alerted the crew to their error.

Narrative: We were cleared to descend to 14;000 FT while in a holding pattern. Descending through FL180 we set the altimeter to the local setting. The local altimeter setting was noted on the clipboard as 29.94. However the correct altimeter setting was 29.34. A CRJ was ahead of us was leveled at 13;000 FT following the same clearance about 1/2 mile ahead of us. Upon reaching 14;300 FT we received an RA stating 'Monitor vertical speed'. I disconnected the autopilot and adjusted the flight path to remain in the TCAS command bars. We notified ATC of the deviation and RA compliance.ATC queried the CRJ about their altitude and they confirmed that they had received an RA as well and that they were level at 13;000 FT at the time of the advisory. Upon hearing this we checked the altimeter setting in the AFIS and noted the discrepancy. We corrected the altimeter setting to 29.63 then climbed and leveled at 14;000 FT. In the future I will exercise more caution in verifying the correct altimeter setting.

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.

Setting the wrong altimeter setting on descent caused the flight crew of a ce-750 to lose separation with another arrival intended to be 1;000 ft below them. A TCAS RA resulted and alerted the crew to their error.