B737-300 crew encountered severe turbulence in ZBW class a airspace.

Attributes
ACN	492750
Time
Date	200011
Day	Sat
Local Time Of Day	1801 To 2400
Place
Locale Reference	navaid : alb.vortac
State Reference	NY
Altitude	msl bound lower : 23000 msl bound upper : 29000
Environment
Weather Elements	Turbulence
Light	Night
Aircraft 1
Controlling Facilities	artcc : zbw.artcc
Operator	common carrier : air carrier
Make Model Name	B737-300
Operating Under FAR Part	Part 121
Navigation In Use	other other vortac
Flight Phase	descent : vacating altitude
Route In Use	arrival star : ns
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
ASRS Report	492750
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial pilot : multi engine
ASRS Report	492751
Events
Anomaly	inflight encounter : weather inflight encounter : turbulence
Independent Detector	other flight crewa other flight crewb other other : 4 other other : 3
Resolutory Action	controller : issued alert controller : issued new clearance none taken : detected after the fact
Consequence	other
Supplementary
Problem Areas	Weather
Primary Problem	Weather

Narrative:

Unforecast severe turbulence encounter. ZBW reported light to moderate turbulence during descent into bos from FL290-FL240. We requested early descent to below FL240 to avoid area of turbulence reported ahead. Captain (PF) slowed to B737 turbulence penetration speed. Captain made PA and seated all passenger and flight attendants well prior to commencing descent. We encountered moderate to severe turbulence descending through FL290. Requested that ZBW let us continue descent to below FL240 to get below turbulence as soon as possible. ZBW cleared us to FL230. Turbulence diminished at FL240. No further turbulence was encountered. No injuries were reported and aircraft landed uneventfully in bos. Logbook entry was made in aircraft maintenance logbook documenting severe turbulence encounter.

Original NASA ASRS Text

Title: B737-300 CREW ENCOUNTERED SEVERE TURB IN ZBW CLASS A AIRSPACE.

Narrative: UNFORECAST SEVERE TURB ENCOUNTER. ZBW RPTED LIGHT TO MODERATE TURB DURING DSCNT INTO BOS FROM FL290-FL240. WE REQUESTED EARLY DSCNT TO BELOW FL240 TO AVOID AREA OF TURB RPTED AHEAD. CAPT (PF) SLOWED TO B737 TURB PENETRATION SPD. CAPT MADE PA AND SEATED ALL PAX AND FLT ATTENDANTS WELL PRIOR TO COMMENCING DSCNT. WE ENCOUNTERED MODERATE TO SEVERE TURB DSNDING THROUGH FL290. REQUESTED THAT ZBW LET US CONTINUE DSCNT TO BELOW FL240 TO GET BELOW TURB ASAP. ZBW CLRED US TO FL230. TURB DIMINISHED AT FL240. NO FURTHER TURB WAS ENCOUNTERED. NO INJURIES WERE RPTED AND ACFT LANDED UNEVENTFULLY IN BOS. LOGBOOK ENTRY WAS MADE IN ACFT MAINT LOGBOOK DOCUMENTING SEVERE TURB ENCOUNTER.

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.