Exhibit 99

TRW Inc. and Subsidiaries
Computation of Ratio of Earnings
to Fixed Charges  Unaudited

(In millions except ratio data)

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|------------------------------------------------------- | - | ---- | -------------- | - | ----------------------- | ----- | ------- | - | ---- | ----- | ------- | - | ---- | ----- | ----- | - | - | ----- | ----- | - | - | ----- | ----- | - | 
|                                                        |   |      | Three Months   |   | Years Ended December 31
|                                                        |   |      | Ended          |   |                        
|                                                        |   |      | March 31, 2001 |   | 2000                    |       | 1999    |   | 1998 |       | 1997    |   | 1996
|                                                        |   |      |                |   |                         |       |         |   |      |       |         |   |     
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|Earnings from continuing
operations before income taxes | $ | 73.0 |                |   | $                       | 706.4 | (A)     |   | $    | 787.3 | (B)     |   | $    | 746.1 |       |   | $ | 239.7 | (C)   |   | $ | 302.2 | (D)  
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|Unconsolidated affiliates                               |   |      | 8.5            |   |                         |       | 1.2     |   |      |       | (37.1   | ) |      |       | 1.0   |   |   |       | (8.0  | ) |   |       | 1.4   |  
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|Minority earnings                                       |   |      | 6.1            |   |                         |       | 12.5    |   |      |       | 22.8    |   |      |       | 10.5  |   |   |       | 20.2  |   |   |       | 11.5  |  
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|Fixed charges excluding capitalized interest            |   |      | 150.3          |   |                         |       | 606.9   |   |      |       | 552.1   |   |      |       | 174.3 |   |   |       | 123.9 |   |   |       | 129.0 |  
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|Earnings                                                |   | $    | 237.9          |   |                         | $     | 1,327.0 |   |      | $     | 1,325.1 |   |      | $     | 931.9 |   |   | $     | 375.8 |   |   | $     | 444.1 |  
|                                                        |   |      |                |   |                         |       |         |   |      |       |         |   |      |       |       |   |   |       |       |   |   |       |       |   | 
|Fixed Charges:                                         
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|Interest expense                                        |   | $    | 129.5          |   |                         | $     | 523.8   |   |      | $     | 476.7   |   |      | $     | 114.4 |   |   | $     | 75.4  |   |   | $     | 84.2  |  
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|Capitalized interest                                    |   |      | 1.5            |   |                         |       | 5.0     |   |      |       | 4.7     |   |      |       | 4.7   |   |   |       | 4.5   |   |   |       | 3.5   |  
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|Portion of rents representative of interest factor      |   |      | 20.8           |   |                         |       | 83.1    |   |      |       | 75.3    |   |      |       | 59.9  |   |   |       | 48.5  |   |   |       | 43.2  |  
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|Interest expense of unconsolidated affiliates           |   |      | 0.0            |   |                         |       | 0.0     |   |      |       | 0.0     |   |      |       | 0.0   |   |   |       | 0.0   |   |   |       | 1.6   |  
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|Total fixed charges                                     |   | $    | 151.8          |   |                         | $     | 611.9   |   |      | $     | 556.7   |   |      | $     | 179.0 |   |   | $     | 128.4 |   |   | $     | 132.5 |  
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|Ratio of earnings to fixed charges                      |   |      | 1.6            | x |                         |       | 2.2     | x |      |       | 2.4     | x |      |       | 5.2   | x |   |       | 2.9   | x |   |       | 3.4   | x
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|(A) |  | The 2000 earnings from continuing operations before income taxes of
$706.4 million, includes an $11.7 million earnings charge, $6.2 million
after the effect of minority interest, for purchased in-process research
and development. See Acquisitions note in the Notes to Financial
Statements of the Companys 2000 Annual Report to Shareholders.
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|(B) |  | The 1999 earnings from continuing operations before income taxes of
$787.3 million, includes an $85.3 million earnings charge for purchased
in-process research and development. See Acquisitions note in the Notes
to Financial Statements of the Companys 1999 Annual Report to
Shareholders.                                                     
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|(C) |  | The 1997 earnings from continuing operations before income taxes of
$239.7 million includes a $548 million earnings charge for purchased
in-process research and development. See Acquisitions note in the Notes
to Financial Statements of the Companys 1997 Annual Report to
Shareholders.                                                        
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|(D) |  | The 1996 earnings from continuing operations before income taxes of
$302.2 million includes a charge of $384.8 million as a result of actions
taken in the automotive and space and defense businesses. See Special
Charges and Divestiture note in the Notes to Financial Statements of the
Companys 1996 Annual Report to Shareholders.