##### 



Exhibit 99(a)

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

(In millions except ratio data)

|                                                                                |  |            |       |                         |  |      |       |      |  |      |         |      |  |   |         |     |  |   |       |  |  |   |       |    
|------------------------------------------------------------------------------- |  | ---------- | ----- | ----------------------- |  | ---- | ----- | ---- |  | ---- | ------- | ---- |  | - | ------- | --- |  | - | ----- |  |  | - | ----- | ---
|                                                                                |  | Six Months |       | Years Ended December 31
|                                                                                |  | Ended      |       |                        
|                                                                                |  | June 30    |       |                         |  |      |       |      |  |      |         |      |  |   |         |     |  |   |       |  |  |  
|                                                                                |  | 2002       |       | 2001                    |  | 2000 |       | 1999 |  | 1998 |         | 1997
|                                                                                |  |            |       |                         |  |      |       |      |  |      |         |     
|Earnings from continuing
operations before income
taxes and extraordinary
items |  | $          | 305.6 |                         |  | $    | 61.6  |      |  | $    | 607.3   | (A)  |  | $ | 692.1   | (B) |  | $ | 746.1 |  |  | $ | 239.7 | (C)
|Unconsolidated affiliates                                                       |  |            | 1.2   |                         |  |      | 98.4  |      |  |      | 1.2     |      |  |   | (37.8   | )   |  |   | 1.0   |  |  |   | (8.0  | )  
|Minority earnings                                                               |  |            | 11.2  |                         |  |      | 23.1  |      |  |      | 12.6    |      |  |   | 23.1    |     |  |   | 10.5  |  |  |   | 20.2  |    
|Fixed charges excluding
capitalized interest                                    |  |            | 238.4 |                         |  |      | 543.5 |      |  |      | 602.4   |      |  |   | 548.0   |     |  |   | 174.3 |  |  |   | 123.9 |    
|                                                                                |  |            |       |                         |  |      |       |      |  |      |         |      |  |   |         |     |  |   |       |  |  |   |       |    
|Earnings                                                                        |  | $          | 556.4 |                         |  | $    | 726.6 |      |  | $    | 1,223.5 |      |  | $ | 1,225.4 |     |  | $ | 931.9 |  |  | $ | 375.8 |    
|                                                                                |  |            |       |                         |  |      |       |      |  |      |         |      |  |   |         |     |  |   |       |  |  |   |       |    
|Fixed charges:                                                                  |  |            |       |                         |  |      |       |      |  |      |         |      |  |   |         |     |  |   |       |  |  |   |       |    
|Interest expense                                                                |  | $          | 205.4 |                         |  | $    | 477.4 |      |  | $    | 523.4   |      |  | $ | 475.6   |     |  | $ | 114.4 |  |  | $ | 75.4  |    
|Capitalized interest                                                            |  |            | 1.9   |                         |  |      | 5.1   |      |  |      | 5.0     |      |  |   | 4.7     |     |  |   | 4.7   |  |  |   | 4.5   |    
|Portion of rents
representative of interest
factor                              |  |            | 33.0  |                         |  |      | 66.1  |      |  |      | 79.0    |      |  |   | 72.3    |     |  |   | 59.9  |  |  |   | 48.5  |    
|                                                                                |  |            |       |                         |  |      |       |      |  |      |         |      |  |   |         |     |  |   |       |  |  |   |       |    
|Total fixed charges                                                             |  | $          | 240.3 |                         |  | $    | 548.6 |      |  | $    | 607.4   |      |  | $ | 552.6   |     |  | $ | 179.0 |  |  | $ | 128.4 |    
|                                                                                |  |            |       |                         |  |      |       |      |  |      |         |      |  |   |         |     |  |   |       |  |  |   |       |    
|Ratio of earnings to fixed
charges                                              |  |            | 2.3x  |                         |  |      | 1.3x  |      |  |      | 2.0x    |      |  |   | 2.2x    |     |  |   | 5.2x  |  |  |   | 2.9x  |    
|                                                                                |  |            |       |                         |  |      |       |      |  |      |         |      |  |   |         |     |  |   |       |  |  |   |       |    



|(A) |  | The 2000 earnings from continuing operations before income taxes and
extraordinary items of $607.3 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 from continuing operations before income taxes and
extraordinary items of $692.1 million, includes a $66.6 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 from continuing operations 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.