B757 flight crew receives a TCAS RA during descent leveloff.

Attributes
ACN	715362
Time
Date	200610
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : phl.airport
State Reference	PA
Altitude	agl single value : 17000
Environment
Flight Conditions	VMC VMC
Light	Night
Aircraft 1
Controlling Facilities	artcc : zzz.artcc tracon : zzz.tracon
Operator	common carrier : air carrier
Make Model Name	B757 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	descent : intermediate altitude
Flight Plan	IFR
Aircraft 2
Controlling Facilities	artcc : zzz.artcc tracon : zzz.tracon
Operator	common carrier : air carrier
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Operating Under FAR Part	Part 121
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : multi engine pilot : atp
Experience	flight time last 90 days : 220 flight time total : 10000 flight time type : 350
ASRS Report	715362
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Events
Anomaly	conflict : airborne critical non adherence : required legal separation non adherence : far non adherence : clearance
Independent Detector	aircraft equipment : tcas other flight crewa
Resolutory Action	flight crew : took precautionary avoidance action
Supplementary
Problem Areas	Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance

Narrative:

On descent to lga; given descent to 17000 ft from above FL180. Passing FL180; altimeters were changed to local altimeter setting (29.36). While adjusting altimeter setting during expedited descent got a TA on traffic below; viewed TCAS with altimeter setting not completed. Approaching leveloff at 17000 ft; reset altimeter setting and received RA. Altimeter setting showed altitude roll down to approximately 16700 ft; and climbing due to RA commanded climb. Other aircraft received RA as well. No conflict note from controling agency.

Original NASA ASRS Text

Title: B757 FLT CREW RECEIVES A TCAS RA DURING DSCNT LEVELOFF.

Narrative: ON DSCNT TO LGA; GIVEN DSCNT TO 17000 FT FROM ABOVE FL180. PASSING FL180; ALTIMETERS WERE CHANGED TO LCL ALTIMETER SETTING (29.36). WHILE ADJUSTING ALTIMETER SETTING DURING EXPEDITED DSCNT GOT A TA ON TFC BELOW; VIEWED TCAS WITH ALTIMETER SETTING NOT COMPLETED. APCHING LEVELOFF AT 17000 FT; RESET ALTIMETER SETTING AND RECEIVED RA. ALTIMETER SETTING SHOWED ALT ROLL DOWN TO APPROX 16700 FT; AND CLBING DUE TO RA COMMANDED CLB. OTHER ACFT RECEIVED RA AS WELL. NO CONFLICT NOTE FROM CTLING AGENCY.

Data retrieved from NASA's ASRS site as of January 2009 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.