-----BEGIN PRIVACY-ENHANCED MESSAGE-----
Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
Originator-Key-Asymmetric:
 MFgwCgYEVQgBAQICAf8DSgAwRwJAW2sNKK9AVtBzYZmr6aGjlWyK3XmZv3dTINen
 TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB
MIC-Info: RSA-MD5,RSA,
 Fti58WZIBDS2yCHco87Fwrwjui0b6ILZI2fyjgtkzsRMWT03scis5MnkGmSDpnOJ
 +5ot7zt679G6/g4Y3QbM6g==

<SEC-DOCUMENT>0001140361-07-003195.txt : 20070213
<SEC-HEADER>0001140361-07-003195.hdr.sgml : 20070213
<ACCEPTANCE-DATETIME>20070213130502
ACCESSION NUMBER:		0001140361-07-003195
CONFORMED SUBMISSION TYPE:	5
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20061231
FILED AS OF DATE:		20070213
DATE AS OF CHANGE:		20070213

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			BURSTEIN JOSEPH
		CENTRAL INDEX KEY:			0001078810

	FILING VALUES:
		FORM TYPE:		5
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-24293
		FILM NUMBER:		07607673

	BUSINESS ADDRESS:	
		BUSINESS PHONE:		3149466525

	MAIL ADDRESS:	
		STREET 1:		3600 MUELLER ROAD
		CITY:			ST CHARLES
		STATE:			MO
		ZIP:			63302

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			LMI AEROSPACE INC
		CENTRAL INDEX KEY:			0001059562
		STANDARD INDUSTRIAL CLASSIFICATION:	AIRCRAFT PART & AUXILIARY EQUIPMENT, NEC [3728]
		IRS NUMBER:				431309065
		STATE OF INCORPORATION:			MO
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		3600 MUELLER RD
		CITY:			ST CHARLES
		STATE:			MO
		ZIP:			63302
		BUSINESS PHONE:		6369466525

	MAIL ADDRESS:	
		STREET 1:		P O BOX 900
		CITY:			ST CHARLES
		STATE:			MO
		ZIP:			63302
</SEC-HEADER>
<DOCUMENT>
<TYPE>5
<SEQUENCE>1
<FILENAME>doc1.xml
<DESCRIPTION>FORM 5
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0202</schemaVersion>

    <documentType>5</documentType>

    <periodOfReport>2006-12-31</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <form3HoldingsReported>0</form3HoldingsReported>

    <form4TransactionsReported>1</form4TransactionsReported>

    <issuer>
        <issuerCik>0001059562</issuerCik>
        <issuerName>LMI AEROSPACE INC</issuerName>
        <issuerTradingSymbol>LMIA</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001078810</rptOwnerCik>
            <rptOwnerName>BURSTEIN JOSEPH</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O LMI AEROSPACE, INC.</rptOwnerStreet1>
            <rptOwnerStreet2>3600 MUELLER RD.</rptOwnerStreet2>
            <rptOwnerCity>ST. CHARLES</rptOwnerCity>
            <rptOwnerState>MO</rptOwnerState>
            <rptOwnerZipCode>63302</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle></officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2005-08-31</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>3000</value>
                    <footnoteId id="F1"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>502296</value>
                    <footnoteId id="F2"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value></value>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2006-06-28</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>1450</value>
                    <footnoteId id="F1"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>503746</value>
                    <footnoteId id="F3"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value></value>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2006-09-19</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>5</transactionFormType>
                <transactionCode>G</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>5000</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>498746</value>
                    <footnoteId id="F4"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value></value>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">Grant of restricted stock issued pursuant to the LMI Aerospace, Inc. 2005 Long-Term Incentive Plan, not previously reported on a Form 4.</footnote>
        <footnote id="F2">Does not include 100,000 shares disposed of by Mr. Burstein on March 3, 2006, such disposition having been preivously disclosed on a Form 4; includes 499,296 shares of common stock held of record by the Joseph Burstein Revocable Trust U/T/A dated August 20, 1983, over which Mr. and Mrs. Burstein, as co-trustees, share voting and dispositive power and 3,000 shares of restricted stock.</footnote>
        <footnote id="F3">Does not include 100,000 shares disposed of by Mr. Burstein on March 3, 2006, such disposition having been preivously disclosed on a Form 4; includes 499,296 shares of common stock held of record by the Joseph Burstein Revocable Trust U/T/A dated August 20, 1983, over which Mr. and Mrs. Burstein, as co-trustees, share voting and dispositive power and 4,450 shares of restricted stock.</footnote>
        <footnote id="F4">Does not include 100,000 shares disposed of by Mr. Burstein on March 3, 2006, such disposition having been preivously disclosed on a Form 4; includes 494,296 shares of common stock held of record by the Joseph Burstein Revocable Trust U/T/A dated August 20, 1983, over which Mr. and Mrs. Burstein, as co-trustees, share voting and dispositive power and 4,450 shares of restricted stock.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/ Joseph Burstein</signatureName>
        <signatureDate>2007-02-12</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
-----END PRIVACY-ENHANCED MESSAGE-----