高松空港に緊急着陸したANA787は、前部E/Eベイにあるバッテリーが”火元”だったという。(

ボストンでのJAL787の火災発生(これは後部E/Eベイのバッテリー)に続く今回のANA機のバッテリー発火をうけて、FAA(米連邦航空局)は787型機のバッテリーの安全性が証明されるまで、同型機の飛行停止命令を本日発行している(airworthiness directive -AD- 耐空性改善命令)。

FAAの法的拘束力は米国内だけであるから、ADの具体的対象はUALが現在保有する6機の787だけであるが、各国の同様政府機関もFAA勧告に追随するので、事実上日本をはじめとして全787型機の飛行停止命令となる。(

塔載バッテリーの安全性が証明されるまで、787型機の運航は出来ないこととなった。

NTSB航空機委員会は主任調査官のLorenda Ward女史を日本に派遣し、日本の調査機関(JTSBー運輸安全委員会)の原因解明の支援に当たらせるという。
同女史はこれまでも航空機事故調査で何度か事故調査チームの主任を務め、事故原因の解明や、航空安全改善の提言も行っている、なかなかの手腕の人物であるようだ。
FAAとBoeingからの派遣者と一緒に金曜に日本入りの予定だという。

日本で起った事の調査主管は日本の当局になるので、ANAの件ではNTSB側は飽く迄補助の立場になろう。

原因究明は始まったばかりの段階なわけだが、”バッテリーの一部生産ロットに不良品があった”とか、”コードが不良品でした”とか、”組立て時に配線を間違いますた”とかであれば簡単な話であるが、現代の機器は自己診断機能を持ち、配線を誤っただけでは発火などはしない設計に普通はなっているし、原因が単純簡単なものである可能性は低そうである。

787の電気系統システムのデザインそのものに問題のルーツがあった場合、これの改善設計をし、テストを繰返して安全性の確認・証明をし、当局の承認を得て機体改修を行うとなれば、相当長期間(半年~1年等)787のグラウンドが続くことも考えられようか。

現段階で安易に憶測は出来ないが、これまでの流れからすると、その可能性は決して低くは無いだろうか。

原因がはっきり解れば、その対応策はいろいろなアプローチが考えられるのだから、先ずは原因究明に全力をということだろう。

787、ちょっと大変なことになってきたろうか。
某社に務める隣のおやぢ、今日はえらく渋い顔してたねえ~


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NTSB Press Release
National Transportation Safety Board
Office of Public Affairs

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NTSB Sending Investigator to Assist with Boeing 787 Battery Incident in Japan

January 16
WASHINGTON - The National Transportation Safety Board is sending an investigator to Japan to assist in the investigation of an emergency landing of an ANA Boeing 787 that occurred yesterday. Initial reports indicate that the flight crew received multiple messages in the cockpit concerning the battery and other systems that were affected, and also reported an odor in the cockpit and the cabin. The airplane subsequently landed, and passengers and crew evacuated via emergency slides.

The investigation is being led by the Japan Transport Safety Board (JTSB). The NTSB has designated investigator Lorenda Ward as the U. S. accredited representative to the JTSB's investigation and she will be accompanied by representatives from the FAA and Boeing. The U.S. team is expected to arrive in Japan early Friday morning. Further information regarding the investigation will be released by the JTSB.

NTSB Media Contact:
Office of Public Affairs
490 L'Enfant Plaza, SW
Washington, DC 20594
(202) 314-6100
Peter Knudson
peter.knudson@ntsb.gov

http://www.ntsb.gov/news/2013/130116.html
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Press Release – FAA Statement
For Immediate Release
January 16, 2013
Contact: Laura Brown or Brie Sachse
Phone: laura.j.brown@faa.gov or brie.sachse@faa.gov

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As a result of an in-flight, Boeing 787 battery incident earlier today in Japan, the FAA will issue an emergency airworthiness directive (AD) to address a potential battery fire risk in the 787 and require operators to temporarily cease operations. Before further flight, operators of U.S.-registered, Boeing 787 aircraft must demonstrate to the Federal Aviation Administration (FAA) that the batteries are safe.

The FAA will work with the manufacturer and carriers to develop a corrective action plan to allow the U.S. 787 fleet to resume operations as quickly and safely as possible.

The in-flight Japanese battery incident followed an earlier 787 battery incident that occurred on the ground in Boston on January 7, 2013. The AD is prompted by this second incident involving a lithium ion battery. The battery failures resulted in release of flammable electrolytes, heat damage, and smoke on two Model 787 airplanes. The root cause of these failures is currently under investigation. These conditions, if not corrected, could result in damage to critical systems and structures, and the potential for fire in the electrical compartment.

Last Friday, the FAA announced a comprehensive review of the 787’s critical systems with the possibility of further action pending new data and information. In addition to the continuing review of the aircraft’s design, manufacture and assembly, the agency also will validate that 787 batteries and the battery system on the aircraft are in compliance with the special condition the agency issued as part of the aircraft’s certification.

United Airlines is currently the only U.S. airline operating the 787, with six airplanes in service. When the FAA issues an airworthiness directive, it also alerts the international aviation community to the action so other civil aviation authorities can take parallel action to cover the fleets operating in their own countries.

http://www.faa.gov/news/press_releases/news_story.cfm?newsId=14233
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Emergency airworthiness directive (AD) 2013-02-51」 (FAA Jan 16, 2013 pdf)