NTSB Identification: NYC86IA093.
The docket is stored on NTSB microfiche number 30325.
Scheduled 14 CFR operation of TRANS WORLD AIRLINES
Incident occurred Wednesday, March 26, 1986 in BOSTON, MA
Aircraft: BOEING 727-231, registration: N52311
Injuries: 2 Minor,94 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.

TWO OF 3 REQD FLT ATTENDANTS (F/A'S) WERE DISTRIBUTING PASSENGER (PAX) COATS AS THE ACFT WAS BEING TAXIED AFTER LNDG. SMOKE FM AN OVERHEATED AIR COND (A/C) PACK BGN ENTERING THE CABIN & THE F/A'S RETURNED TO THEIR DUTY STATIONS. THE FLT CREW STOPPED THE ACFT AT THE GATE & SHUT DWN THE ENGS, BUT LEFT THE APU RUNNING TO PROVIDE ELECTRICITY FOR LIGHTING. THEF/A'S OPENED THE L FWD DOOR & GND PSNL OPENED THE REAR STAIR DOOR TO DEPLANE THE PAX. THE CAPT MADE AN ANNOUNCEMENT TO KEEP THE PAX CALM, BUT SMOKE BCM DENSE & PAX OPENED THE EMERG EXITS OVR THE WINGS & BGN EXITING FM THEM. TWO PAX RCVD MINOR INJURIES WHILE EXITING OVR THE WINGS. AN INVESTIGATION REVEALED THE ACFT HAD BEEN DISPATCHED WITH THE R PACK COOL-ING FAN INOP AS AUTHORIZED BY THE MIN EQUIP LIST (MEL). DRG FLT, A RADIO INTERFERENCE FILTER IN THE A/C SYS FAILED WHICHALLOWED THE FWD PACK SHUT-OFF VALVE TO OPEN, BUT NOT CLOSE. THIS PERMITTED APU AIR TO RUN THE AFFECTED PACK EVEN THO THESWITCH WAS OFF & A CIRCUIT BRKR WAS PULLED. WITH THE ENGS SHUT DOWN & THE R COOLING FAN INOP, THE SYS OVERHEATED.

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

AIR COND/HEATING/PRESSURIZATION,CABIN TEMP CONTROL..FAILURE,PARTIAL

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

AIR COND/HEATING/PRESSURIZATION..OVERTEMPERATURE

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