GILDER GAGNON HOWE & CO LLC
SC 13G/A, 1999-08-10
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                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                                    --------

                    Under the Securities Exchange Act of 1934

                                  SCHEDULE 13G
                                (Amendment No. 1)


             INFORMATION STATEMENT PURSUANT TO RULES 13d-1 AND 13d-2
                    UNDER THE SECURITIES EXCHANGE ACT OF 1934


                       Airport Systems International Inc.
                       ----------------------------------
                                (Name of Issuer)


                                  Common Stock
                         -----------------------------
                         (Title of Class of Securities)


                                    00949N103
                                 --------------
                                 (CUSIP Number)


                                  July 31, 1999
             -------------------------------------------------------
             (Date of Event Which Requires Filing of this Statement)


Check the  appropriate box to designate the rule pursuant to which this Schedule
is filed:

     |X| Rule 13d-1(b)
     |_| Rule 13d-1(c)
     |_| Rule 13d-1(d)


                                    --------

                                Page 1 of 6 Pages

<PAGE>

                                  SCHEDULE 13G

CUSIP No. 00949N103                                           Page 2 of 6 Pages
- -------------------------------------------------------------------------------
1)      NAME OF REPORTING PERSON
        S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

        Gilder Gagnon Howe & Co. LLC
        13-3174112
- -------------------------------------------------------------------------------
2)      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP    (a) |_|

                                                            (b) |_|
- -------------------------------------------------------------------------------
3)      SEC USE ONLY

- -------------------------------------------------------------------------------
4)      CITIZENSHIP OR PLACE OF ORGANIZATION

        New York

- -------------------------------------------------------------------------------
                         5)    SOLE VOTING POWER

        NUMBER                 None
        OF               ------------------------------------------------------
        SHARES           6)    SHARED VOTING POWER
        BENEFICIALLY
        OWNED BY               None
        EACH             ------------------------------------------------------
        REPORTING        7)    SOLE DISPOSITIVE POWER
        PERSON
                               None
                         ------------------------------------------------------
        WITH             8)    SHARED DISPOSITIVE POWER

                               803,602
- -------------------------------------------------------------------------------
9)      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

        803,602
- -------------------------------------------------------------------------------
10)     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN
        SHARES                                                 |_|
- -------------------------------------------------------------------------------
11)     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

        36.0%
- -------------------------------------------------------------------------------
12)     TYPE OF REPORTING PERSON

        BD
- -------------------------------------------------------------------------------

                                Page 2 of 6 Pages

<PAGE>

                                  Schedule 13G

Item 1(a). Name of Issuer:

Airport Systems International Inc.

Item 1(b). Address of Issuer's Principal Executive Offices:

11300 West 89th Street
Overland Park, KS  66214

Item 2(a). Name of Person Filing:

Gilder Gagnon Howe & Co. LLC

Item 2(b). Address of Principal Business Office or, if None, Residence:

1775 Broadway, 26th Floor
New York, NY  10019

Item 2(c). Citizenship:

New York

Item 2(d). Title of Class of Securities:

Common Stock

Item 2(e). CUSIP Number:

00949N103

Item 3. If this  statement  is filed  pursuant to  ss.ss.240.13D-1(B),  or
        240.13D-2(B) or (C), check whether the person filing is a:

        (a)  |X| Broker or Dealer Registered Under Section 15 of the Act
                 (15 U.S.C. 78o)

        (b)  |_| Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c)

        (c)  |_| Insurance Company as defined in section 3(a)(19) of the Act
                 (15 U.S.C. 78c)

        (d)  |_| Investment Company registered under section 8 of the
                 Investment Company Act of 1940 (15 U.S.C. 80a-8)

        (e)  |_| Investment Adviser in accordance with ss.240.13d-1(b)(1)(ii)(E)


                                Page 3 of 6 Pages

<PAGE>

        (f)  |_| Employee benefit plan or endowment fund in accordance with
                 ss.240.13d-1(b)(1)(ii)(F)

        (g)  |_| Parent  Holding  Company or control  person in  accordance
                 with ss.240.13d-1(b)(ii)(G)

        (h)  |_| Savings Association as defined in ss.3(b) of the Federal
                 Deposit Insurance Act (12 U.S.C. 1813)

        (i)  |_| Church plan that is  excluded  from the  definition  of an
                 investment company under ss.3(c)(15) of the Investment Company
                 Act of 1940 (15 U.S.C. 80a-3)

        (j)  |_| Group, in accordance with ss.240.13d-1(b)(ii)(J)

Item 4. Ownership.

        (a)  Amount beneficially owned:  803,602

        (b)  Percent of class:  36.0%

        (c)  Number of shares as to which such person has:

             (i)   Sole power to vote or to direct the vote:  None

             (ii)  Shared power to vote or to direct the vote:  None

             (iii) Sole power to dispose or to direct the disposition of: None

             (iv)  Shared power to dispose or to direct the disposition of:
                   803,602

The shares reported include 573,427 shares held in customer  accounts over which
members and/or employees of the Reporting Person have discretionary authority to
dispose of or direct the  disposition  of the shares and 203,175  shares held in
accounts owned by the members of the Reporting  Person and their families.

Item 5. Ownership of Five Percent or Less of a Class.

Not applicable.

                                Page 4 of 6 Pages

<PAGE>

Item 6.  Ownership of More than Five Percent on Behalf of Another Person.

         The  owners  of the  accounts  in which  the  shares  reported  on this
Schedule  are held have the right to receive or the power to direct the  receipt
of dividends  from, or the proceeds from the sale of, such  securities.  Item 7.
Identification  and Classification of the Subsidiary Which Acquired the Security
Being Reported on by the Parent Holding Company.

Not applicable.

Item 8.  Identification and Classification of Members of the Group.

Not applicable.

Item 9.  Notice of Dissolution of Group.

Not applicable.

Item 10. Certification.

         By signing  below I certify  that,  to the best of my  knowledge  and
belief, the securities referred to above were acquired in the ordinary course of
business  and were not acquired for the purpose of and do not have the effect of
changing or  influencing  the control of the issuer of such  securities and were
not acquired in connection  with or as a participant in any  transaction  having
such purposes or effect.

                                Page 5 of 6 Pages

<PAGE>

                                    SIGNATURE


           After reasonable  inquiry and to the best knowledge and belief of the
undersigned,  the  undersigned  certifies that the information set forth in this
Statement is true, complete and correct.


                                      August 10, 1999
                                      ----------------------
                                           Date


                                      /s/ Walter Weadock
                                      ----------------------
                                           Signature


                                     Walter Weadock, Member
                                     -----------------------
                                           Name/Title

                                Page 6 of 6 Pages




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