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Exhibit 99

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

(In millions except ratio data)

|                                                     |  |              |       |                         |  |      |       |      |  |      |         |      |  |   |         |     |  |   |       |  |  |   |       |    
|---------------------------------------------------- |  | ------------ | ----- | ----------------------- |  | ---- | ----- | ---- |  | ---- | ------- | ---- |  | - | ------- | --- |  | - | ----- |  |  | - | ----- | ---
|                                                     |  | Three Months |       | Years Ended December 31
|                                                     |  | Ended        |       |                        
|                                                     |  | March 31     |       |                         |  |      |       |      |  |      |         |      |  |   |         |     |  |   |       |  |  |  
|                                                     |  | 2002         |       | 2001                    |  | 2000 |       | 1999 |  | 1998 |         | 1997
|                                                     |  |              |       |                         |  |      |       |      |  |      |         |     
|Earnings before income
taxes and extraordinary
items |  | $            | 129.2 |                         |  | $    | 140.5 |      |  | $    | 706.4   | (A)  |  | $ | 787.3   | (B) |  | $ | 746.1 |  |  | $ | 239.7 | (C)
|Unconsolidated affiliates                            |  |              | 0.3   |                         |  |      | 98.3  |      |  |      | 1.2     |      |  |   | (37.1   | )   |  |   | 1.0   |  |  |   | (8.0  | )  
|Minority earnings                                    |  |              | 4.1   |                         |  |      | 23.2  |      |  |      | 12.5    |      |  |   | 22.8    |     |  |   | 10.5  |  |  |   | 20.2  |    
|Fixed charges excluding
capitalized interest         |  |              | 121.3 |                         |  |      | 548.5 |      |  |      | 606.9   |      |  |   | 552.1   |     |  |   | 174.3 |  |  |   | 123.9 |    
|                                                     |  |              |       |                         |  |      |       |      |  |      |         |      |  |   |         |     |  |   |       |  |  |   |       |    
|Earnings                                             |  | $            | 254.9 |                         |  | $    | 810.5 |      |  | $    | 1,327.0 |      |  | $ | 1,325.1 |     |  | $ | 931.9 |  |  | $ | 375.8 |    
|                                                     |  |              |       |                         |  |      |       |      |  |      |         |      |  |   |         |     |  |   |       |  |  |   |       |    
|Fixed Charges:                                       |  |              |       |                         |  |      |       |      |  |      |         |      |  |   |         |     |  |   |       |  |  |   |       |    
|Interest expense                                     |  | $            | 103.6 |                         |  | $    | 477.7 |      |  | $    | 523.8   |      |  | $ | 476.7   |     |  | $ | 114.4 |  |  | $ | 75.4  |    
|Capitalized interest                                 |  |              | 0.9   |                         |  |      | 5.1   |      |  |      | 5.0     |      |  |   | 4.7     |     |  |   | 4.7   |  |  |   | 4.5   |    
|Portion of rents
representative of
interest factor   |  |              | 17.7  |                         |  |      | 70.8  |      |  |      | 83.1    |      |  |   | 75.3    |     |  |   | 59.9  |  |  |   | 48.5  |    
|                                                     |  |              |       |                         |  |      |       |      |  |      |         |      |  |   |         |     |  |   |       |  |  |   |       |    
|Total fixed charges                                  |  | $            | 122.2 |                         |  | $    | 553.6 |      |  | $    | 611.9   |      |  | $ | 556.7   |     |  | $ | 179.0 |  |  | $ | 128.4 |    
|                                                     |  |              |       |                         |  |      |       |      |  |      |         |      |  |   |         |     |  |   |       |  |  |   |       |    
|Ratio of earnings to fixed
charges                   |  |              | 2.1x  |                         |  |      | 1.5x  |      |  |      | 2.2x    |      |  |   | 2.4x    |     |  |   | 5.2x  |  |  |   | 2.9x  |    
|                                                     |  |              |       |                         |  |      |       |      |  |      |         |      |  |   |         |     |  |   |       |  |  |   |       |    



|(A) |  | The 2000 earnings before income taxes and extraordinary items 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.
|--- |  | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|   
|(B) |  | The 1999 earnings before income taxes and extraordinary items 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.                                                     
|   
|(C) |  | The 1997 earnings before income taxes and extraordinary items 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.