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From: ltlee1@hotmail.com (ltlee1)
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Subject: Re: Beoing 787 incidents 1, 2, 3
Date: Wed, 18 Jun 2025 12:54:56 +0000
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From WSJ:

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Exclusive | Boeing 787’s Emergency-Power System Likely Active Before Air
India Crash
Andrew Tangel, Shan Li
June 18, 2025 2:57 am ET

Investigators believe Air India Flight 171 had an emergency-power
generator operating when it crashed last week, raising questions about
whether the plane’s engines functioned properly during takeoff.

The preliminary finding, according to people familiar with the probe,
gives investigators a new line of inquiry ...

The emergency system is known as a ram air turbine. It is a small
propeller that drops from the bottom of the 787 Dreamliner’s fuselage to
serve as a backup generator.

Engines normally produce electricity for an aircraft and help run its
flight-control systems. The power generated by the RAT can enable
crucial aircraft components to function.

The system can deploy automatically in flight if both engines have
failed or if all three hydraulic system pressures are low, according to
an airline’s Boeing 787 manual reviewed by The Wall Street Journal. It
can also deploy if cockpit instruments lose power or problems emerge
with the aircraft’s electric motor pumps.

Pilots can manually deploy the RAT if needed. ...

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