IMPACT SYSTEMS INC /CA/
SC 13D/A, 1998-02-04
INDUSTRIAL INSTRUMENTS FOR MEASUREMENT, DISPLAY, AND CONTROL
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<PAGE>   1

                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549


                                  SCHEDULE 13D
                   UNDER THE SECURITIES EXCHANGE ACT OF 1934*
                                (AMENDMENT NO. 3)


                              IMPACT SYSTEMS, INC.
- --------------------------------------------------------------------------------
                                (Name of Issuer)

                           Common Stock, no par value
- --------------------------------------------------------------------------------
                         (Title of Class of Securities)

                                   452913 10 6
- --------------------------------------------------------------------------------
                                 (CUSIP Number)

                               Dennis R. DeBroeck
                               Fenwick & West LLP
                              Two Palo Alto Square
                               Palo Alto, CA 94306
                                 (415) 494-0600
- --------------------------------------------------------------------------------
(Name, Address and Telephone Number of Person Authorized to Receive Notices and
Communications)

                                January 22, 1998
- --------------------------------------------------------------------------------
             (Date of Event which Requires Filing of this Statement)


If the filing person has previously filed a statement on Schedule 13G to report
the acquisition which is the subject of this Schedule 13D, and is filing this
schedule because of Rule 13d-1(b)(3) or (4), check the following box |_|.

* The information required on the remainder of this cover page shall not be
  deemed to be "filed" for the purpose of Section 18 of the Securities Exchange
  Act of 1934 (the "Act") or otherwise subject to the liabilities of that
  section of the Act but shall be subject to all other provisions of the Act.



                               (Page 1 of 5 Pages)

<PAGE>   2
                                  SCHEDULE 13D


CUSIP No.     452913 10 6                                      PAGE 2 OF 5 PAGES

- --------------------------------------------------------------------------------
   1  NAME OF REPORTING PERSON
      S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
      Elsag Bailey Process Automation N.V.      
- --------------------------------------------------------------------------------
   2  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                       (a) [X]
                                                                       (b) [ ]
- --------------------------------------------------------------------------------
   3  SEC USE ONLY

- --------------------------------------------------------------------------------
   4  SOURCE OF FUNDS*
      Not Applicable
- --------------------------------------------------------------------------------
   5  CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT 
      TO ITEMS 2(d) or 2(e)                                                 [ ]
- --------------------------------------------------------------------------------
   6  CITIZENSHIP OR PLACE OF ORGANIZATION
      The Netherlands          
- --------------------------------------------------------------------------------
                      7   SOLE VOTING POWER
                                              
     NUMBER OF        ----------------------------------------------------------
       SHARES         8   SHARED VOTING POWER
    BENEFICIALLY          0             
      OWNED BY        ----------------------------------------------------------
        EACH          9   SOLE DISPOSITIVE POWER
     REPORTING                              
       PERSON         ----------------------------------------------------------
        WITH          10  SHARED DISPOSITIVE POWER
                          0             
- --------------------------------------------------------------------------------
  11  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
      0                  
- --------------------------------------------------------------------------------
  12  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES* [ ]

- --------------------------------------------------------------------------------
  13  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
      0%                 
- --------------------------------------------------------------------------------
  14  TYPE OF REPORTING PERSON*
      HC               
- --------------------------------------------------------------------------------







<PAGE>   3
                                  SCHEDULE 13D


CUSIP No.     452913 10 6                                      PAGE 3 OF 5 PAGES

- --------------------------------------------------------------------------------
   1  NAME OF REPORTING PERSON
      S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
      Elsag International N.V.
- --------------------------------------------------------------------------------
   2  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                       (a) [X]
                                                                       (b) [ ]
- --------------------------------------------------------------------------------
   3  SEC USE ONLY

- --------------------------------------------------------------------------------
   4  SOURCE OF FUNDS*
      Not Applicable
- --------------------------------------------------------------------------------
   5  CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT 
      TO ITEMS 2(d) or 2(e)                                                 [ ]
- --------------------------------------------------------------------------------
   6  CITIZENSHIP OR PLACE OF ORGANIZATION
      The Netherlands          
- --------------------------------------------------------------------------------
                      7   SOLE VOTING POWER
                                              
     NUMBER OF        ----------------------------------------------------------
       SHARES         8   SHARED VOTING POWER
    BENEFICIALLY          0             
      OWNED BY        ----------------------------------------------------------
        EACH          9   SOLE DISPOSITIVE POWER
     REPORTING                              
       PERSON         ----------------------------------------------------------
        WITH          10  SHARED DISPOSITIVE POWER
                          0             
- --------------------------------------------------------------------------------
  11  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
      0                  
- --------------------------------------------------------------------------------
  12  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES* [ ]

- --------------------------------------------------------------------------------
  13  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
      0%                 
- --------------------------------------------------------------------------------
  14  TYPE OF REPORTING PERSON*
      HC               
- --------------------------------------------------------------------------------








<PAGE>   4

                                                                     Page 4 of 5


         This Amendment No. 3 to the Restated Schedule 13D is filed by Elsag
Bailey Process Automation N.V. ("EBPA") and Elsag International N.V. (formerly
Elsag International B.V., "EINV") (collectively, the "Reporting Persons"), in
connection with the sale by EINV of 2,378,900 shares (the "Shares") of common
stock, no par value ("Common Stock") of Impact Systems, Inc., a California
corporation, to Voith Sulzer Paper Technology North America, Inc., a Delaware
corporation. This Amendment No. 3 amends the Restated Schedule 13D filed by
EBPA, EINV and Elsag Bailey, Inc. (successor to Bailey Controls Company, "EBI")
on December 19, 1997 (the "Restated 13D") with respect to EINV's shares of
Common Stock, as amended by Amendment No. 1 to the Restated Schedule 13D filed
by Istituto per la Ricostruzione Industriale -- IRI S.p.A. ("IRI"), Finmeccanica
S.p.A. ("Finmeccanica"), EBPA, EINV and EBI on January 20, 1998 and Amendment
No. 2 to the Restated 13D filed by IRI and Finmeccanica on January 30, 1998.
Except as otherwise indicated, all defined terms shall have the meaning ascribed
to such terms in the Restated Schedule 13D, as amended.

         The sole purpose of this Amendment No. 3 is attach the signatures of
EBPA and EINV to Amendment No. 2.


<PAGE>   5

                                                                     Page 5 of 5


                                    SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify
that the information set forth in this statement is true, complete and correct.


Dated:  February 2, 1998


                                            ELSAG INTERNATIONAL N.V.


                                            /s/ George W. Hawk, Jr.
                                            ------------------------------------
                                            George W. Hawk, Jr.
                                            Attorney-in-Fact


                                            ELSAG BAILEY PROCESS AUTOMATION N.V.


                                            /s/ George W. Hawk, Jr.
                                            ------------------------------------
                                            George W. Hawk, Jr.
                                            Attorney-in-Fact



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