USS Greeneville/Ehime Maru Collision Update

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投稿者 ntsb.gov 日時 2001 年 3 月 15 日 14:10:54:

回答先: Re: 番犬の実力投稿者 MASA 日時 2001 年 3 月 14 日 23:19:40:

NTSB - Advisory

NTSB Advisory

National Transportation Safety Board

Washington, DC 20594

March 2, 2001

USS Greeneville/Ehime Maru Collision Update

The National Transportation Safety Board is continuing its investigation of the
February 9, 2001 collision between the nuclear submarine, U.S.S. Greeneville,
and the Japanese fishing vessel Ehime Maru. Nine of the 35 persons aboard
the Japanese vessel, which sank after the collision, are missing.

The following is updated factual information documented by NTSB investigators
in Washington, D.C. since the departure of the Board's investigative team from
Hawaii on February 24.

The USS Greeneville was equipped with a sonar data logger that recorded
sonar data and "own ship" data once per second. Data for the accident were transferred
to a data tape (normally used for archiving data). This data tape is en route
to NTSB headquarters for analysis. However, the Navy has provided the NTSB with
a preliminary data file containing parameters extracted from this tape. Heading
and keel depth from this data file are plotted for a 10 minute period that includes
the collision in figure 1. The NTSB has not applied any instrument corrections
to these data.

These data show the Greeneville ascending to an initial periscope
depth (uncorrected instrument readings ranged from 63 to 67 ft keel depth)
at about 23:38:30 UTC (1:38:30 Hawaii time).

The Greeneville then ascends about 3 ft higher in the water (using
uncorrected instrument readings) about 1 minute later for a total time at
periscope depth of about 1 * minutes.

This is consistent with witness statements.

At 23:40 the Greeneville commences its descent from a heading of
120 deg. At about 23:41 the Greeneville begins a heading change to
port (left). She reaches a maximum depth of about 405 ft at 23:42 on a heading
of 028 deg.

At 23:42:30 the Greeneville begins its rapid ascent to the surface
and collides with the Ehime Maru at about 23:43:20. At impact, the
Ehime Maru was on a heading of 166 deg while the Greeneville
was on a heading of approximately 018 deg.

Figure 1: Preliminary Greeneville Depth and Heading

Although the submarin

http://www.ntsb.gov/Pressrel/2001/010302.htm

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