NTSB Identification: CHI87IA201.
The docket is stored on NTSB microfiche number 36279.
Scheduled 14 CFR UNITED AIRLINES
Incident occurred Wednesday, September 02, 1987 in CHICAGO, IL
Probable Cause Approval Date: 07/10/1989
Aircraft: MCDONNELL DOUGLAS DC-8-71, registration: N8078U
Injuries: 1 Minor,126 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.

SMOKE DETECTED IN THE CABIN RESULTED IN AN EVACUATION OF THE AIRCRAFT JUST AFTER BEING PUSHED BACK FROM THE JET-WAY. SUBSEQUENT INVESTIGATION ESTABLISHED THAT A MALFUNCTIONING PACK VALVE HAD CAUSED THE AIR-CONDITIONING SYSTEM TO OVERHEAT CAUSING THE SMOKE. THE EMERGENCY SLIDE AT DOOR 2R INFLATED PARTIALLY INSIDE THE ACFT AND WAS NOT USABLE. AT THE TIME OF INITIAL INVESTIGATION THE SLIDE TRAY DOOR FROM 2R WAS FOUND LYING ON THE FLOOR INSIDE THE ACFT. EXITS 1L, 2L, 4L, 4R AND FOUR OVER WING EXITS WERE USED (THE CAPT HAD LOWERED THE FLAPS TO FULL DOWN FOR THE EVACUATION). IT WAS DETERMINED DURING INVESTIGATION THAT THE DOOR WAS NOT OPENED FULLY ENOUGH FOR EXIT 2R TO OPERATE PROPERLY. UAL MODIFIED THE TRAINING TO EMPHASIZE THE DOOR OPENING PROCEDURE. THE FA SAID SHE PULLED THE (MANUAL INFLATION) HANDLE ON 2R.

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

AIR COND/HEATING/PRESSURIZATION,SAFETY VALVE..FAILURE,TOTAL

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

AIR COND/HEATING/PRESSURIZATION..OVERTEMPERATURE

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

FUSELAGE,CABIN..SMOKE


Contributing Factors

MISC EQPT/FURNISHINGS,SLIDES..MOVEMENT RESTRICTED


Contributing Factors

EMERGENCY PROCEDURE..IMPROPER..FLIGHT ATTENDANT


Contributing Factors

EMERGENCY PROCEDURE..INITIATED..PILOT IN COMMAND


Contributing Factors

EVACUATION..PERFORMED..PILOT IN COMMAND

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