NTSB Identification: DEN84IA007.
The docket is stored on NTSB microfiche number 23177.
Scheduled 14 CFR UNITED AIRLINES
Incident occurred Tuesday, October 18, 1983 in PUEBLO, CO
Aircraft: BOEING 727-222, registration: N70634
Injuries: 7 Uninjured.

NTSB investigators used data provided by various sources and may not have traveled in support of this investigation to prepare this aircraft incident report.

THE ACFT EXPERIENCED AN UNCONTROLLED ALTITUDE DEVIATION AS A RESULT OF ENCOUNTERING CAT AT 27000 FT. IT CLIMBED AT 6000 FPM TO 3200 FT. THE ACFT WAS 40 TO 50 MILES NORTH & SLIGHTLYBELOW THE JET CORE. NO TURBULENCE WAS FORECAST.

The National Transportation Safety Board determines the probable cause(s) of this incident to be:

WEATHER CONDITION..TURBULENCE,CLEAR AIR

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