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Investigative Update of Battery Fire Japan Airlines B-787 - Jan 7, 2013 . Deborah A.P. Hersman Chairman January 24, 2013. Timeline – JAL Battery Incident. 10:06am - aircraft arrived at gate in Boston from Narita, Japan 183 passengers and 11 crew deplaned

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investigative update of battery fire japan airlines b 787 jan 7 2013
Investigative Update of Battery FireJapan Airlines B-787 - Jan 7, 2013
  • Deborah A.P. Hersman
  • Chairman
  • January 24, 2013
timeline jal battery incident
Timeline – JAL Battery Incident
  • 10:06am - aircraft arrived at gate in Boston from Narita, Japan
    • 183 passengers and 11 crew deplaned
  • 10:32am - Cleaning and maintenance crew noticed smoke in cabin
  • 10:35am - Mechanic noted flames coming from APU battery in aft electronics bay
timeline cont
Timeline, cont.
  • 10:37am – Airport Rescue & Fire Fighting notified
  • 10:40am – Fire and rescue personnel arrive on scene
  • 12:19pm – Fire and rescue personnel report event was “controlled”
apu battery
APU Battery

Exemplar Battery

JAL Event Battery

slide7

Main battery

location

Auxiliary Power Unit (APU)

battery location

investigative activities
Investigative Activities
  • Battery exam and teardown at NTSB Materials Laboratory
  • Component exam and teardown
    • Tucson, AZ – Battery Charger Unit and Start Power Unit (Securaplane Technologies)
    • Phoenix, AZ – APU Controller (United Technology Aerospace Systems)
    • Seattle, WA – Two General Purpose Modules (Boeing Commercial Airplanes)
    • Fujisawa, Japan – Battery Monitoring Unit (Kanto Aircraft Instrument)
jal apu battery c ells
JAL APU Battery Cells

Exemplar Battery

JAL Event Battery

cell and battery specifications

Cell

Nominal capacity (Ah)

Nominal voltage

Operational voltage range (V)

Weight (lb.)

Dimensions (in.)

75

3.7

2.5 – 4.025

6.0

5.2

2.0

7.7

W

D

H

Cell and Battery Specifications

Battery

75

29.6

20 – 32.2

63

10.9

14.2

8.5

slide11

Cell Design

7.7

(including terminal)

7 .0

5.2

2.0

(Unit : inch)

electrodes
Electrodes

Negativeterminal

Positive terminal

Current collector

Negative electrode

Separator

Positive electrode

Case

Rupture valves

electrode construction
Electrode Construction

separator

25 μm

graphite

Cu

10 μm

graphite

separator

25 μm

Li-CoO2

Al

20 μm

Li-CoO2

Not to scale

cell examinations t o date
Cell Examinations To Date
  • CT scan of entire assembly

8

1

  • CT scan
  • disassembled

SEM –

Scanning Electron

Microscopy

2

7

  • CT scan
  • disassembled
  • disassembled
  • SEM

EDS –

Energy Dispersive

Spectroscopy

6

  • CT scan

3

  • CT scan
  • disassembled
  • CT scan

5

4

  • disassembled
  • CT scan
  • SEM
  • EDS
we are l ooking f or
We Are Looking For:
  • Signs of thermal runaway
  • Signs of electrical short circuiting
  • Manufacturing defects
  • “Anything unusual”
findings t o date
Findings To Date
  • Fire was present
  • Signs of thermal runaway
  • Signs of electrical short circuiting
next steps
Next Steps
  • Complete the in-house laboratory examinations
  • Conduct examinations and testing of exemplar batteries
  • Synthesize lab examination findings with fire forensics and aviation systems investigation
parties to investigation
Parties to Investigation
  • Federal Aviation Administration
  • Boeing Commercial Airplanes
  • Accredited Representatives
    • Japan – JTSB
      • GS Yuasa
      • Japan Airlines
    • France – BEA
      • Thales Avionics Electrical Systems
  • Technical assistance provided by Carderock Division, Naval Surface Warfare Center
jtsb investigation ana battery event
JTSB InvestigationANA Battery Event

Photo by Reuters/Kyodo/Landov