Pioneer Investment Management Inc/Adv – ‘SC 13G/A’ on 8/20/99 re: Nai Technologies Inc

On:  Friday, 8/20/99   ·   Accession #:  734072-99-96   ·   File #:  5-35934

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Amendment to Statement of Beneficial Ownership   —   Schedule 13G
Filing Table of Contents

Document/Exhibit                   Description                      Pages   Size 

 1: SC 13G/A    Schedule 13G Nai Technologies, Inc.                    5     15K 

Document Table of Contents

SC 13G/A
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 UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, DC 20549

 Under the Securities and Exchange Act of 1934

(Amendment No. 5 )

NAI TECHNOLOGIES, INC.
(Name of Issuer)

Common
(Title of Class of Securities)

 Date of Event Which Requires Filing of this Statement
 August 20, 1999

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

 X Rule 13d-2(b)
 62872H107
(CUSIP NUMBER)

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SC 13G/A
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1        Name of Reporting                       Pioneer                        
Person                                  Investment            
IRS Identification                      Management Inc.       
No. of Above                            13-1961193            
                                    (a/k/a/ Pioneering
                                     Management Corp.)

2)       Check the Appropriate Box               (a)                            
of A Member of  Group                                         
(See Instructions)                      (b)  X                

3        SEC Use Only                                                           

4        Citizenship of Place of                                                
Organization                            Delaware              

  Number of                               (5)  Sole Voting       0
Shares                                         Power          
  Beneficially Owned                      (6)  Shared Voting     0
by Each Reporting                              Power          
Person With                             (7)  Sole Dispositive 
                                                 Power           0

                                          (8)  Shared            0
                                           Dispositive
                                     Power

9        Aggregate Amount Beneficially           0                              
Owned by Each                                                 
Reporting Person                                              

10       Check if the aggregate                                                 
Amount in Row  (9) Exclude Certain                            
Shares (See                                                   
Instructions)                                                 

11       Percent of Class Represented                                           
By Amount in Row 9.                     0.00%                 

12       Type of Reporting                                                      
Person (See Instructions)               IA                    

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SC 13G/A
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Item 1(a)         Name of Issuer.                                               

NAI TECHNOLOGIES, INC.                      

Item 1(b)         Address of Issuer's Principal Executive Office's              

282 New York Avenue                         
Huntington,  NY   11743                     

Item 2(a)         Name of Person Filing.                                        

Pioneer Investment Management, Inc. a/k/a/  
Pioneering Management Corporation           

Item 2(b)         Address of Principal Business Office:                         

60 State Street, Boston, MA 02109           

Item 2(c)         Citizenship:                                                  

State of Delaware                           
Pioneer Investment Management a/k/a         
Pioneering Management Corporation           

Item 2(d)         Title of Class of Securities.                                 

Common Stock                                

Item 2(e)         CUSIP Number.                                                 

62872H107                                   

Item 3           The person filing this statement pursuant to Rule 13-1(b)      
or 13(d)-2(b) or (c) is a:                    

                  (e)      Investment  Adviser  registered  under Section 203 of
          the Investment Advisers Act of 1940.

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SC 13G/A
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Item 4.  Ownership                                                              

(a)        Amount Beneficially Owned                                     0      

(b)        Percent of Class                                              0.00%  

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

 (i)      sole power to vote or to direct the vote             0

 (ii)     shared power to vote or to direct vote               0

(iii) sole power to dispose or to direct disposition of 0     

 (iv)     shared power to dispose or to direct disposition     0

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

If this statement is being filed to report the fact that as of the date         
Hereof the reporting person has ceased to be the beneficial owner of more       
than five percent of the class of securities, check here:    X                  

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

Inapplicable.                                                 

Item 7.  Identification and Classification of the Subsidiary Which Acquired     
the Security Being Reported On By the Parent Holding Company. 

Inapplicable.                                                 

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

Inapplicable.                                                 

Item 9.  Notice of Dissolution of the Group.                                    

Inapplicable.                                                 

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SC 13G/A
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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  transactions  having
such purposes or effect.                                                        

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

August 20, 1999                             
Date                                        

/s/Robert P. Nault                          
Signature                                   
Robert P. Nault                                                               
Assistant Secretary                                                           
Type Name and Title                                                           

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Dates Referenced Herein   and   Documents Incorporated by Reference

				Referenced-On Page
This ‘SC 13G/A’ Filing		Date		First		Last			Other Filings
Filed on:		8/20/99		1		5			SC 13G/A
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