Narrative:

ATC facility: havana. Location: 160 NM north gcm. Level at FL330, 160 NM northwest of gcm IMC, no WX on radar. We entered an area of turbulence and precipitation. Aircraft started a 3000 FPM climb with autoplt on altitude hold. We were in radar contact with muha. A 400 ft positive deviation occurred before the aircraft could be descended back to FL330.

Google
 

Original NASA ASRS Text

Title: B727 160 NM N GCM CRUISING FL330 ENCOUNTERED TURB AND PRECIPITATION NOT SHOWN ON RADAR. 400 FT ALTDEV RESULTED.

Narrative: ATC FACILITY: HAVANA. LOCATION: 160 NM N GCM. LEVEL AT FL330, 160 NM NW OF GCM IMC, NO WX ON RADAR. WE ENTERED AN AREA OF TURB AND PRECIPITATION. ACFT STARTED A 3000 FPM CLB WITH AUTOPLT ON ALT HOLD. WE WERE IN RADAR CONTACT WITH MUHA. A 400 FT POSITIVE DEV OCCURRED BEFORE THE ACFT COULD BE DSNDED BACK TO FL330.

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.