# NTSB LAX92IA209: Boeing 767-222, N604UA, Los Angeles, CA, May 13, 1992

- Type: NTSB incident investigation
- Classification: Incident · Minor injuries · Incident investigation · Final report
- Date: May 13, 1992, 15:52 local (22:52 UTC)
- Place: Los Angeles, CA
- Location: 33.9425° N, 118.4080° W: Placed by OpenAirDocs at LOS ANGELES INTL (LAX), within about a mile (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=33.9425&lon=-118.4080&mi=10
- Phase of flight: [Takeoff](https://openairdocs.org/ntsb-phases/300) (OpenAirDocs' grouping)
- Highest injury: Minor injuries
- Injuries: 3 minor, 81 uninjured
- Status: Completed, report September 14, 1993
- Report: Approved by Office Director
- NTSB case key (mKey): 27458
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=LAX92IA209
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/27458/pdf
- Page: https://openairdocs.org/ntsb/LAX92IA209

## Probable cause

A RUPTURE IN THE AIRPLANE'S AIR CONDITION/HEAT/PRESSURIZATION/APU DUCT, ALONG ITS WELDED SEAM.  CONTRIBUTING TO THE INCIDENT WAS THE MANUFACTURERS' FAILURE TO ISSUE A SERVICE BULLETIN APPLICALBE TO ALL APU DUCTS IN THE SYSTEMS.

## Sequence of events

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

- Airframe/component/system failure/malfunction, takeoff - roll/run
  - air cond/heating/pressurization - ruptured (cause)
  - maintenance,service bulletin/letter - not issued, manufacturer (contributing factor)
- Occurrence

## Analysis

THE PNEUMATIC DISTRIBUTION SUPPLY DUCT RUPTURED AS THE AIRPLANE BEGAN ITS TAKEOFF ROLL WITH THE FIRST OFFICER AT THE CONTROLS. THE CAPTAIN FELT A SLIGHT CHANGE IN CABIN PRESSURE AND OBSERVED AN ADVISORY MESSAGE ON THE ELECTRONIC INFORMATION CREW ALARM SYSTEM (EICAS) THAT CAUTIONED OF A LEAK IN THE PNEUMATIC DUCT SYSTEM.  THE FIRST FLIGHT ATTENDANT ADVISED THE FLIGHT CREW THAT THERE WAS SMOKE, DUST AND HIGH TEMPERATURES IN THE CABIN. THE CAPTAIN ASSUMED CONTROL OF THE AIRPLANE, ABORTED THE TAKEOFF AND TURNED OFF THE RUNWAY AT A MIDFIELD TAXIWAY.  AFTER THE AIRPLANE EXITED THE RUNWAY THE CAPTAIN DISPATCHED THE FIRST OFFICER TO THE CABIN TO SURVEY THE SITUATION.  THE FIRST OFFICER CONFIRMED THE FLIGHT ATTENDANT'S REPORT AND ADVISED THAT THE PASSENGERS WERE COUGHING CONTINUOUSLY.  THE CAPTAIN ELECTED TO EVACUATE ALL PERSONNEL VIA THE EMERGENCY EGRESS SLIDES. THE EXAMINATION DISCLOSED THE APU SUPPLY DUCT RUPTURED ALONG THE WELDED SEAM AT FUSELAGE STATION (FS) 1219.

## Aircraft

- Registration: [N604UA](https://openairdocs.org/deregistered/N604UA-2007-02-22), registration cancelled 2007-02-22, S/N 21865 (OpenAirDocs)
- Reported make and model: BOEING 767-222
- Registry model: [Boeing 767-222](https://openairdocs.org/model/boeing-767-222) (registry code 1385122) (OpenAirDocs)
- Category: Airplane
- Serial number: 21865
- Airframe hours: 30969
- Engines: P&W 2037 38200 lbs thrust turbo fan
- Damage: Minor damage
- Flight: Part 121
- Operator: United Airlines
- Registered owner: United Airlines
- Airworthiness certificate: Standard, Transport
- Last inspection: Continuous airworthiness, August 28, 1991, 2,608 hours before
- Departed: LAX
- Destination: EWR, NEWARK, NJ
- Flight plan: IFR
- Airport: LAX, Los Angeles Int'L Arpt, runway 25, 1,209 × 150 ft, concrete

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 52; flight engineer, airline transport; airplane ratings: multi-engine land, single-engine land; instrument ratings: airplane; medical: class 1, valid medical--w/ waivers/lim; seat: left; flight hours: 15,401 total, 902 in this make and model, 201 in the last 90 days, 74 in the last 30 days, 7 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Visibility: 10 statute miles
- Lowest ceiling: none

## 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 19920513014769I](https://openairdocs.org/incident/19920513014769I), May 13, 1992: Boeing 767222, Los Angeles, CA. Smoke and heat in cabin on takeoff. Aborted. Evacuated. APU air supply duct had ruptured.

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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