Medium large transport climbed above assigned altitude when TCASII RA is received.

Attributes
ACN	196899
Time
Date	199112
Day	Sun
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : pbi
State Reference	FL
Altitude	msl bound lower : 2000 msl bound upper : 2000
Environment
Flight Conditions	Mixed
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : pbi
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other
Flight Phase	descent : approach
Route In Use	approach : straight in
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 145 flight time total : 17095
ASRS Report	196899
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	aircraft equipment problem : less severe altitude deviation : excursion from assigned altitude conflict : airborne less severe
Independent Detector	aircraft equipment other aircraft equipment : unspecified
Resolutory Action	other
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

On approach to 9L at pbi, in the vicinity of OM, we received a TA on TCASII and shortly thereafter received an RA. The command was to climb, which we did. Inbound to the OM we were at 2000 ft and we climbed to 2300 after receiving the RA. When a clear of conflict was received we continued the approach and landed with no further incident. We did not see the intruding aircraft. As to why this may have been a close encounter, the proximity of 9L and 9R at pbi and other airports with close parallel runways, and the mix of transport aircraft and single engine aircraft is an open invitation to a midair collision, regardless as to how proficient the approach controllers are, or how vigilant the air crew are.

Original NASA ASRS Text

Title: MLG CLBED ABOVE ASSIGNED ALT WHEN TCASII RA IS RECEIVED.

Narrative: ON APCH TO 9L AT PBI, IN THE VICINITY OF OM, WE RECEIVED A TA ON TCASII AND SHORTLY THEREAFTER RECEIVED AN RA. THE COMMAND WAS TO CLB, WHICH WE DID. INBOUND TO THE OM WE WERE AT 2000 FT AND WE CLBED TO 2300 AFTER RECEIVING THE RA. WHEN A CLR OF CONFLICT WAS RECEIVED WE CONTINUED THE APCH AND LANDED WITH NO FURTHER INCIDENT. WE DID NOT SEE THE INTRUDING ACFT. AS TO WHY THIS MAY HAVE BEEN A CLOSE ENCOUNTER, THE PROX OF 9L AND 9R AT PBI AND OTHER ARPTS WITH CLOSE PARALLEL RWYS, AND THE MIX OF TRANSPORT ACFT AND SINGLE ENG ACFT IS AN OPEN INVITATION TO A MIDAIR COLLISION, REGARDLESS AS TO HOW PROFICIENT THE APCH CTLRS ARE, OR HOW VIGILANT THE AIR CREW ARE.

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.