# NTSB NYC86IA093: Boeing 727-231, N52311, Boston, MA, March 27, 1986

- Type: NTSB incident investigation
- Classification: Incident · Minor injuries · Incident investigation · Final report
- Date: March 26, 1986, 23:41 local (Mar 27, 1986, 04:41 UTC)
- Place: Boston, MA
- Location: 42.3629° N, 71.0064° W: Placed by OpenAirDocs at GENERAL EDWARD LAWRENCE LOGAN INTL (BOS), within about a mile (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=42.3629&lon=-71.0064&mi=10
- Phase of flight: [Taxi](https://openairdocs.org/ntsb-phases/250) (OpenAirDocs' grouping)
- Highest injury: Minor injuries
- Injuries: 2 minor, 94 uninjured
- Status: Completed
- Report: Approved by Office Director
- NTSB case key (mKey): 30236
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=NYC86IA093
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/30236/pdf
- Page: https://openairdocs.org/ntsb/NYC86IA093

## Sequence of events

In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf).

- Airframe/component/system failure/malfunction, taxi - from landing
  - air cond/heating/pressurization,cabin temp control - failure,partial (cause)
  - air cond/heating/pressurization - overtemperature (cause)
  - fuselage,cabin - smoke

## Analysis

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.

## Aircraft

- Registration: [N52311](https://openairdocs.org/deregistered/N52311-2011-03-30), registration cancelled 2011-03-30, S/N 19830, built 1968 (OpenAirDocs)
- Reported make and model: BOEING 727-231
- Registry model: [Boeing 727-231](https://openairdocs.org/model/boeing-727-231) (registry code 1384079) (OpenAirDocs)
- Registry engine: [Pratt & Whitney JT8D-1](https://openairdocs.org/engine/pratt-whitney-jt8d-1) (registry code 52044, turbo-jet) (OpenAirDocs)
- Category: Airplane
- Serial number: 19830
- Airframe hours: 44246
- Engines: P&W JT8D-9A turbo fan
- Damage: No damage
- Flight: Part 121
- Operator: Trans World Airlines
- Registered owner: First Security Bank Utah
- Airworthiness certificate: Standard, Transport
- Departed: STL, ST LOUIS, MO
- Flight plan: IFR
- Airport: BOS, Logan Intl, runway 22L, 10,005 × 150 ft, asphalt

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 48; airline transport; airplane ratings: multi-engine land; instrument ratings: airplane; medical: class 1, valid medical--no waivers/lim.; seat: left; flight hours: 7,792 total, 702 in this make and model, 4 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Night/bright
- Wind: 220° at 15 knots
- Visibility: 15 statute miles
- Lowest ceiling: none
- Temperature: 54 °F, dew point 46 °F
- Altimeter: 30.00 inHg
- Observed at: BOS

## FAA reports on this event (1)

The FAA's own accident and incident reports, matched to the aircraft by N-number and date (OpenAirDocs).

- [Incident 19860326086489I](https://openairdocs.org/incident/19860326086489I), Mar 26, 1986: Boeing 727231, Boston, MA. The aircraft was evacuated at the gate due to smoke in cabin. Pack shutoff valve malfunction. Panicked passengers

From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date, checked against the reported serial number, make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model.

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