19990611046209A

Accident · No damage

FAA accident report · Boeing 777-222 · Madison, WI · June 11, 1999

Date: June 11, 1999 · 21:30 local
Place: Madison, WI
Operating rules: Air carrier (Part 121)
Operator: UALA
Damage: No damage
Aircraft: N781UA
NTSB investigation: NTSBCHI99LA184
Reported as: Boeing 777222

N781UARegistered now · Boeing 777-222S/N 26945 · Built 1996 Airframe modelBoeing 777-222 Engine modelPratt & Whitney PW4000 seriesTurbo-fan

From the FAA’s Accident/Incident Data System (AIDS), through its Aviation Safety Information Portal, as reported. The NTSB investigates accidents separately, and its record of an accident is the fuller one. The aircraft is matched to the registry by N-number and event date, checked against the reported make and model; the registry’s history has gaps, so older matches can be wrong. Compare the reported make and model.

What happened

The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.

(-23) United flight 256 encountered unexpected clear air turbulence while descending through FL180. The turbulence lasted 20 to 30 seconds; the remainder of the flight was smooth. The seat belt sign was not illuminated at the time of the encounter.

As the FAA filed it

(-23) UNITED FLIGHT 256 ENCOUNTERED UNEXPECTED CLEAR AIR TURBULENCE WHILE DESCENDING THROUGH FL180. THE TURBULENCE LASTED 20 TO 30 SECONDS; THE REMAINDER OF THE FLIGHT WAS SMOOTH. THE SEAT BELT SIGN WAS NOT ILLUMINATED AT THE TIME OF THE ENCOUNTER.

NTSB investigation

The NTSB’s investigation of this event, with its probable cause and findings. Matched to this report by N-number and date.

NTSB CHI99LA184Accident · Serious injuriesLimited investigationFinal reportMadison, WIthe pilot-in-command's inadequate evaluation of the weather conditions. Factors associated with the accident were the turbulence encountered and the seat belt sign was not illuminated.Jun 12, 1999 · No damage

Other reports on N781UA · 1

Matched to the same aircraft by N-number and date.

Incident 19990731023439IClimb · Newark, NJ(-23) During climb pilot noticed smoke in cockpit and slight smoke in cabin. Shut down right air condition pack, smoke subsided. Landed at ewr. No evacuation or injuries. Maintenance found APU oil entered ducts. Maintenance cleaned ducts and replaced APU. No…Jul 31, 1999