﻿<?xml version="1.0" encoding="utf-8"?>
<InstanceReport xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
  <Version>2.2.0.7</Version>
  <hasSegments>false</hasSegments>
  <ReportName>Commitments and Contingencies</ReportName>
  <ReportLongName>0217 - Disclosure - Commitments and Contingencies</ReportLongName>
  <DisplayLabelColumn>true</DisplayLabelColumn>
  <ShowElementNames>false</ShowElementNames>
  <RoundingOption />
  <HasEmbeddedReports>false</HasEmbeddedReports>
  <Columns>
    <Column>
      <LabelColumn>false</LabelColumn>
      <Id>1</Id>
      <Labels>
        <Label Id="1" Label="9 Months Ended" />
        <Label Id="2" Label="Sep. 24, 2010" />
      </Labels>
      <CurrencyCode>USD</CurrencyCode>
      <FootnoteIndexer />
      <hasSegments>false</hasSegments>
      <hasScenarios>false</hasScenarios>
      <Segments />
      <Scenarios />
      <Units>
        <Unit>
          <UnitID>USD</UnitID>
          <UnitType>Standard</UnitType>
          <StandardMeasure>
            <MeasureSchema>http://www.xbrl.org/2003/iso4217</MeasureSchema>
            <MeasureValue>USD</MeasureValue>
            <MeasureNamespace>iso4217</MeasureNamespace>
          </StandardMeasure>
          <Scale>0</Scale>
        </Unit>
        <Unit>
          <UnitID>Shares</UnitID>
          <UnitType>Standard</UnitType>
          <StandardMeasure>
            <MeasureSchema>http://www.xbrl.org/2003/instance</MeasureSchema>
            <MeasureValue>shares</MeasureValue>
            <MeasureNamespace>xbrli</MeasureNamespace>
          </StandardMeasure>
          <Scale>0</Scale>
        </Unit>
        <Unit>
          <UnitID>Pure</UnitID>
          <UnitType>Standard</UnitType>
          <StandardMeasure>
            <MeasureSchema>http://www.xbrl.org/2003/instance</MeasureSchema>
            <MeasureValue>pure</MeasureValue>
            <MeasureNamespace>xbrli</MeasureNamespace>
          </StandardMeasure>
          <Scale>0</Scale>
        </Unit>
        <Unit>
          <UnitID>USDEPS</UnitID>
          <UnitType>Divide</UnitType>
          <NumeratorMeasure>
            <MeasureSchema>http://www.xbrl.org/2003/iso4217</MeasureSchema>
            <MeasureValue>USD</MeasureValue>
            <MeasureNamespace>iso4217</MeasureNamespace>
          </NumeratorMeasure>
          <DenominatorMeasure>
            <MeasureSchema>http://www.xbrl.org/2003/instance</MeasureSchema>
            <MeasureValue>shares</MeasureValue>
            <MeasureNamespace>xbrli</MeasureNamespace>
          </DenominatorMeasure>
          <Scale>0</Scale>
        </Unit>
      </Units>
      <CurrencySymbol>$</CurrencySymbol>
    </Column>
  </Columns>
  <Rows>
    <Row>
      <Id>2</Id>
      <Label>Commitments and Contingencies [Abstract]</Label>
      <Level>0</Level>
      <ElementName>lll_CommitmentsAndContingenciesAbstract</ElementName>
      <ElementPrefix>lll</ElementPrefix>
      <IsBaseElement>false</IsBaseElement>
      <BalanceType>na</BalanceType>
      <PeriodType>duration</PeriodType>
      <ShortDefinition>Commitments and Contingencies.</ShortDefinition>
      <IsReportTitle>false</IsReportTitle>
      <IsSegmentTitle>false</IsSegmentTitle>
      <IsSubReportEnd>false</IsSubReportEnd>
      <IsCalendarTitle>false</IsCalendarTitle>
      <IsTuple>false</IsTuple>
      <IsAbstractGroupTitle>true</IsAbstractGroupTitle>
      <IsEquityPrevioslyReportedAsRow>false</IsEquityPrevioslyReportedAsRow>
      <IsEquityAdjustmentRow>false</IsEquityAdjustmentRow>
      <IsBeginningBalance>false</IsBeginningBalance>
      <IsEndingBalance>false</IsEndingBalance>
      <IsReverseSign>false</IsReverseSign>
      <PreferredLabelRole />
      <IsEPS>false</IsEPS>
      <FootnoteIndexer />
      <Cells>
        <Cell>
          <Id>1</Id>
          <ShowCurrencySymbol>false</ShowCurrencySymbol>
          <IsNumeric>false</IsNumeric>
          <IsRatio>false</IsRatio>
          <DisplayZeroAsNone>false</DisplayZeroAsNone>
          <NumericAmount>0</NumericAmount>
          <RoundedNumericAmount>0</RoundedNumericAmount>
          <NonNumbericText />
          <NonNumericTextHeader />
          <FootnoteIndexer />
          <hasSegments>false</hasSegments>
          <hasScenarios>false</hasScenarios>
          <DisplayDateInUSFormat>false</DisplayDateInUSFormat>
        </Cell>
      </Cells>
      <OriginalInstanceReportColumns />
      <ElementDataType>xbrli:stringItemType</ElementDataType>
      <SimpleDataType>string</SimpleDataType>
      <ElementDefenition>Commitments and Contingencies.</ElementDefenition>
      <IsTotalLabel>false</IsTotalLabel>
    </Row>
    <Row>
      <Id>3</Id>
      <Label>Commitments and Contingencies</Label>
      <Level>1</Level>
      <ElementName>us-gaap_CommitmentsAndContingenciesDisclosureTextBlock</ElementName>
      <ElementPrefix>us-gaap</ElementPrefix>
      <IsBaseElement>true</IsBaseElement>
      <BalanceType>na</BalanceType>
      <PeriodType>duration</PeriodType>
      <ShortDefinition>No definition available.</ShortDefinition>
      <IsReportTitle>false</IsReportTitle>
      <IsSegmentTitle>false</IsSegmentTitle>
      <IsSubReportEnd>false</IsSubReportEnd>
      <IsCalendarTitle>false</IsCalendarTitle>
      <IsTuple>false</IsTuple>
      <IsAbstractGroupTitle>false</IsAbstractGroupTitle>
      <IsEquityPrevioslyReportedAsRow>false</IsEquityPrevioslyReportedAsRow>
      <IsEquityAdjustmentRow>false</IsEquityAdjustmentRow>
      <IsBeginningBalance>false</IsBeginningBalance>
      <IsEndingBalance>false</IsEndingBalance>
      <IsReverseSign>false</IsReverseSign>
      <PreferredLabelRole>verboselabel</PreferredLabelRole>
      <IsEPS>false</IsEPS>
      <FootnoteIndexer />
      <Cells>
        <Cell>
          <Id>1</Id>
          <ShowCurrencySymbol>false</ShowCurrencySymbol>
          <IsNumeric>false</IsNumeric>
          <IsRatio>false</IsRatio>
          <DisplayZeroAsNone>false</DisplayZeroAsNone>
          <NumericAmount>0</NumericAmount>
          <RoundedNumericAmount>0</RoundedNumericAmount>
          <NonNumbericText>&lt;!--DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd" --&gt;
   &lt;!-- Begin Block Tagged Note 17 - us-gaap:CommitmentsAndContingenciesDisclosureTextBlock--&gt;
   &lt;div style="margin-left: 0%"&gt;
   &lt;div style="margin-top: 12pt; font-size: 1pt"&gt;&amp;#160;
   &lt;/div&gt;
   &lt;table width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt; font-family: Arial, Helvetica; color: #000000; background: transparent; text-align: left"&gt;
   &lt;tr&gt;
       &lt;td width="3%"&gt;&lt;/td&gt;
       &lt;td width="97%"&gt;&lt;/td&gt;
   &lt;/tr&gt;
   &lt;tr valign="top"&gt;
       &lt;td&gt;
       &lt;b&gt;&lt;font style="font-family: 'Times New Roman', Times"&gt;17.&amp;#160;&lt;/font&gt;&lt;/b&gt;
   &lt;/td&gt;
       &lt;td&gt;
       &lt;b&gt;&lt;font style="font-family: 'Times New Roman', Times"&gt;Commitments
       and Contingencies&lt;/font&gt;&lt;/b&gt;
   &lt;/td&gt;
   &lt;/tr&gt;
   &lt;/table&gt;
   &lt;div style="margin-top: 6pt; font-size: 1pt"&gt;&amp;#160;
   &lt;/div&gt;
   &lt;div align="left" style="margin-left: 0%; margin-right: 0%; text-indent: 2%; font-size: 10pt; font-family: 'Times New Roman', Times; color: #000000; background: transparent"&gt;
       A substantial majority of the Company&amp;#8217;s revenues are
       generated from providing products and services under legally
       binding agreements or contracts with U.S.&amp;#160;Government and
       foreign government customers. U.S.&amp;#160;Government contracts are
       subject to extensive legal and regulatory requirements, and from
       time to time, agencies of the U.S.&amp;#160;Government investigate
       whether such contracts were and are being conducted in
       accordance with these requirements. The Company is currently
       cooperating with the U.S.&amp;#160;Government on several
       investigations, including those specified below, from which
       civil, criminal or administrative proceedings have or could
       result and give rise to fines, penalties, compensatory and
       treble damages, restitution
       &lt;font style="white-space: nowrap"&gt;and/or&lt;/font&gt;
       forfeitures. The Company does not currently anticipate that any
       of these investigations will have a material adverse effect,
       individually or in the aggregate, on its consolidated financial
       position, results of operations or cash flows. However, under
       U.S.&amp;#160;Government regulations, an indictment of the Company
       by a federal grand jury, or an administrative finding against
       the Company as to its present responsibility to be a
       U.S.&amp;#160;Government contractor or subcontractor, could result
       in the Company being suspended for a period of time from
       eligibility for awards of new government contracts or task
       orders or in a loss of export privileges. A conviction, or an
       administrative finding against the Company that satisfies the
       requisite level of seriousness, could result in debarment from
       contracting with the federal government for a specified term. In
       addition, all of the Company&amp;#8217;s U.S.&amp;#160;Government
       contracts: (1)&amp;#160;are subject to audit and various pricing and
       cost controls, (2)&amp;#160;include standard provisions for
       termination for the convenience of the U.S.&amp;#160;Government or
       for default, and (3)&amp;#160;are subject to cancellation if funds
       for contracts become unavailable. Foreign government contracts
       generally include comparable provisions relating to terminations
       for convenience and default, as well as other procurement
       clauses relevant to the foreign government.
   &lt;/div&gt;
   &lt;div style="margin-top: 6pt; font-size: 1pt"&gt;&amp;#160;
   &lt;/div&gt;
   &lt;div align="left" style="margin-left: 0%; margin-right: 0%; text-indent: 2%; font-size: 10pt; font-family: 'Times New Roman', Times; color: #000000; background: transparent"&gt;
       The Company is also subject to and is involved in litigation,
       proceedings, claims or assessments and various contingent
       liabilities incidental to its businesses, including those
       specified below. Furthermore, in connection with certain
       business acquisitions, the Company has assumed some or all
       claims against, and liabilities of, the acquired business,
       including both asserted and unasserted claims and liabilities.
       In accordance with the accounting standard for contingencies,
       the Company records a liability when management believes that it
       is both probable that a liability has been incurred and the
       Company can reasonably estimate the amount of the loss.
       Generally, the loss is recorded at the amount the Company
       expects to resolve the liability. The estimated amounts of
       liabilities recorded for pending and threatened litigation are
       disclosed in Note&amp;#160;8. Amounts recoverable from insurance
       contracts or third parties are recorded as assets when deemed
       probable. At September&amp;#160;24, 2010, the Company had recorded
       approximately $2&amp;#160;million for recoveries from insurance
       contracts or third parties in connection with the amount of
       liabilities recorded for pending
   and threatened litigation. Legal defense costs are expensed as
       incurred. The Company believes it has recorded adequate
       provisions for its litigation and government investigation
       matters. The Company reviews these provisions quarterly and
       adjusts these provisions to reflect the impact of negotiations,
       settlements, rulings, advice of legal counsel and other
       information and events pertaining to a particular matter. While
       it is reasonably possible that an unfavorable outcome may occur
       in one or more of the matters discussed below, unless otherwise
       stated, the Company believes that it is not probable that a loss
       has been incurred in any of these matters. An estimate of loss
       or range of loss is disclosed for a particular litigation matter
       when such amount or amounts can be reasonably estimated and no
       loss has been accrued. The Company believes that any damage
       amounts claimed in the specific matters discussed below are not
       meaningful indicators of potential liability. Although the
       Company believes that it has valid defenses with respect to
       legal matters and investigations pending against it, these
       matters are inherently unpredictable, including those that are
       expected to be resolved with jury trials, for which outcomes are
       difficult to predict. Therefore, it is possible that the
       financial position, results of operations or cash flows of the
       Company could be materially adversely affected in any particular
       period by the unfavorable resolution of one or more of these or
       other contingencies.
   &lt;/div&gt;
   &lt;div style="margin-top: 6pt; font-size: 1pt"&gt;&amp;#160;
   &lt;/div&gt;
   &lt;div align="left" style="margin-left: 0%; margin-right: 0%; text-indent: 2%; font-size: 10pt; font-family: 'Times New Roman', Times; color: #000000; background: transparent"&gt;
       &lt;i&gt;Kalitta Air.&lt;/i&gt;&amp;#160;On January&amp;#160;31, 1997, a predecessor
       of Kalitta Air filed a lawsuit in the U.S.&amp;#160;District Court
       for the Northern District of California (the trial court)
       asserting, among other things, negligence and negligent
       misrepresentation against Central Texas Airborne Systems, Inc.
       (CTAS), a predecessor to L-3 Integrated Systems (L-3 IS), in
       connection with work performed by a predecessor to CTAS to
       convert two Boeing 747 aircraft from passenger configuration to
       cargo freighters. The work was performed using Supplemental Type
       Certificates (STCs) issued in 1988 by the Federal Aviation
       Administration (FAA). In 1996, following completion of the work,
       the FAA issued an airworthiness directive with respect to the
       STCs that effectively grounded the aircraft. On August&amp;#160;11,
       2000, the trial court granted CTAS&amp;#8217; motion for summary
       judgment as to negligence, dismissing that claim. In January
       2001, after a ruling by the trial court that excluded certain
       evidence from trial, a jury rendered a unanimous defense verdict
       in favor of CTAS on the negligent misrepresentation claim. On
       December&amp;#160;10, 2002, the U.S.&amp;#160;Court of Appeals for the
       Ninth Circuit (the Court of Appeals) reversed the trial
       court&amp;#8217;s decisions as to summary judgment and the exclusion
       of evidence, and remanded the case for a new trial on both the
       negligence and negligent misrepresentation claims. The retrial
       ended on March&amp;#160;2, 2005 with a deadlocked jury and mistrial.
       On July&amp;#160;22, 2005, the trial court granted CTAS&amp;#8217; motion
       for judgment as a matter of law as to negligence, dismissing
       that claim, and denied CTAS&amp;#8217; motion for judgment as a
       matter of law as to negligent misrepresentation. On
       October&amp;#160;8, 2008, the Court of Appeals reversed the trial
       court&amp;#8217;s dismissal of the negligence claim and affirmed the
       trial court&amp;#8217;s ruling as to the negligent misrepresentation
       claim. As a result, the case was remanded to the trial court to
       reconsider the negligence claim and for further proceedings on
       the negligent misrepresentation claim. The trial court held a
       new hearing on CTAS&amp;#8217; motion to dismiss the negligence claim
       on April&amp;#160;30, 2009, after which it determined to take the
       matter under advisement. The case is currently scheduled to go
       to a third trial on October&amp;#160;31, 2011. The parties have
       participated in court-ordered mediations from time to time, and
       are expected to participate in future court-ordered mediations
       prior to trial, but to date such mediations have not resulted in
       a mutually acceptable resolution of this matter. In connection
       with these mediations, Kalitta Air has claimed it may seek
       damages at the third trial of between $430&amp;#160;million and
       $900&amp;#160;million, including between $200&amp;#160;million and
       $240&amp;#160;million of pre-judgment interest. CTAS&amp;#8217; insurance
       carrier has accepted defense of this matter and has retained
       counsel, subject to a reservation of rights by the insurer to
       dispute its obligations under the applicable insurance policies
       in the event of a finding against L-3. The Company believes that
       it has meritorious defenses to the claims asserted and the
       damages sought and intends to defend itself vigorously.
   &lt;/div&gt;
   &lt;div style="margin-top: 6pt; font-size: 1pt"&gt;&amp;#160;
   &lt;/div&gt;
   &lt;div align="left" style="margin-left: 0%; margin-right: 0%; text-indent: 2%; font-size: 10pt; font-family: 'Times New Roman', Times; color: #000000; background: transparent"&gt;
       &lt;i&gt;Korean Lot&amp;#160;II Program.&lt;/i&gt;&amp;#160;On April&amp;#160;4, 2005,
       Lockheed Martin Corporation (Lockheed) filed a lawsuit in the
       U.S.&amp;#160;District Court for the Northern District of Georgia
       alleging that L-3 IS is in breach of its license agreement with
       Lockheed and is infringing on Lockheed&amp;#8217;s intellectual
       property rights as a result of its performance of a subcontract
       awarded to L-3 IS for the Korean Lot&amp;#160;II program. On
       October&amp;#160;26, 2010, the parties agreed to settle this matter
       and entered into a licensing agreement under which each party
       licenses to the other the right to use intellectual property
       related to
       &lt;font style="white-space: nowrap"&gt;P-3&lt;/font&gt; aircraft.
   &lt;/div&gt;
   &lt;div style="margin-top: 6pt; font-size: 1pt"&gt;&amp;#160;
   &lt;/div&gt;
   &lt;div align="left" style="margin-left: 0%; margin-right: 0%; text-indent: 2%; font-size: 10pt; font-family: 'Times New Roman', Times; color: #000000; background: transparent"&gt;
       &lt;i&gt;SSPD Investigation.&lt;/i&gt;&amp;#160;As previously disclosed, on June&amp;#160;4, 2010, the
       Company received notice that Integrated Systems&amp;#8217; Special
       Support Programs Division (L-3 SSPD, formerly known as L-3 Joint
       Operations Group or JOG) had been temporarily suspended from
       receiving new contracts or orders from U.S.&amp;#160;Government
       agencies in connection with a governmental investigation of L-3 SSPD relating to the Special Operations Forces Support Activity
       (SOFSA) contract. On
       July&amp;#160;27, 2010, the Company and the U.S.&amp;#160;Air Force
       entered into an administrative agreement under which the Air
       Force lifted the temporary suspension and L-3 agreed, among
       other things, to provide periodic reporting to the Air Force
       regarding its ethics and compliance programs and not to protest
       the award of the follow-on SOFSA contract to a competitor.
   &lt;/div&gt;
   &lt;div style="margin-top: 6pt; font-size: 1pt"&gt;&amp;#160;
   &lt;/div&gt;
   &lt;div align="left" style="margin-left: 0%; margin-right: 0%; text-indent: 2%; font-size: 10pt; font-family: 'Times New Roman', Times; color: #000000; background: transparent"&gt;
       &lt;i&gt;Derivative Action.&lt;/i&gt;&amp;#160;As previously disclosed, on July&amp;#160;15, 2010, a
       stockholder derivative complaint was filed in the Supreme Court
       of the State of New York, New York County, against the
       Company&amp;#8217;s directors and also against the Company as a
       nominal defendant. The complaint asserts, among other things,
       breaches of fiduciary duty and unjust enrichment based on
       allegations that the Company&amp;#8217;s directors acquiesced in, or
       failed to prevent, conduct at issue
       in the &lt;i&gt;SSPD Investigation&lt;/i&gt; matter described above. The
       complaint seeks, among other things, monetary damages, equitable
       relief and an award of fees and expenses.
   &lt;/div&gt;
   &lt;div style="margin-top: 6pt; font-size: 1pt"&gt;&amp;#160;
   &lt;/div&gt;
   &lt;div align="left" style="margin-left: 0%; margin-right: 0%; text-indent: 2%; font-size: 10pt; font-family: 'Times New Roman', Times; color: #000000; background: transparent"&gt;
       &lt;i&gt;Aircrew Training and Rehearsal Support (ATARS)
       Investigation.&lt;/i&gt;&amp;#160;Following a lawsuit filed by Lockheed on
       April&amp;#160;6, 2006 in the U.S.&amp;#160;District Court for the
       Middle District of Florida against the Company and certain
       individuals related to the ATARS II Program (which was settled
       in November 2007), the Company received Grand Jury subpoenas in
       November 2006 and December 2007 in connection with an
       investigation being conducted by the United States Attorney for
       the Middle District of Florida, Orlando Division. The subpoenas
       request the production of documents related to Lockheed&amp;#8217;s
       allegations or produced in the civil litigation. The Company is
       cooperating fully with the U.S.&amp;#160;Government.
   &lt;/div&gt;
   &lt;div style="margin-top: 6pt; font-size: 1pt"&gt;&amp;#160;
   &lt;/div&gt;
   &lt;div align="left" style="margin-left: 0%; margin-right: 0%; text-indent: 2%; font-size: 10pt; font-family: 'Times New Roman', Times; color: #000000; background: transparent"&gt;
       &lt;i&gt;Titan Government Investigation.&lt;/i&gt;&amp;#160;In October 2002, The
       Titan Corporation (Titan) received a grand jury subpoena from
       the Antitrust Division of the DoJ requesting the production of
       documents relating to information technology services performed
       for the U.S.&amp;#160;Air Force at Hanscom Air Force Base in
       Massachusetts and Wright-Patterson Air Force Base in Ohio. Titan
       was informed that other companies who have performed similar
       services had received subpoenas as well. The Company acquired
       Titan in July 2005. On September&amp;#160;20, 2006, counsel for the
       Company was informed by the New York Field Office of the
       DoJ&amp;#8217;s Criminal Antitrust Division that it was considering
       indictment. Additionally, a former Titan employee received a
       letter from the DoJ indicating that he was a target of the
       investigation. In December 2008, the DoJ contacted the Company
       to arrange additional employee interviews concerning a teaming
       agreement relating to the Wright-Patterson Air Force Base
       procurement. In January 2010, counsel for the Company was again
       informed by the New York Field Office that it was considering
       indictment. If the Field Office recommends indictment then,
       under normal DoJ procedures, Titan (now known as L-3 Services,
       Inc.) will be afforded an opportunity to make a presentation to
       the Criminal Antitrust Division in Washington,&amp;#160;D.C. before
       the DoJ acts on the recommendation. It is not known whether an
       indictment of L-3 Services or any of its current or former
       employees will occur. If it does occur, it is possible that L-3
       Services could be suspended or debarred from conducting business
       with the U.S.&amp;#160;Government. The Company is cooperating fully
       with the U.S.&amp;#160;Government.
   &lt;/div&gt;
   &lt;div style="margin-top: 6pt; font-size: 1pt"&gt;&amp;#160;
   &lt;/div&gt;
   &lt;div align="left" style="margin-left: 0%; margin-right: 0%; text-indent: 2%; font-size: 10pt; font-family: 'Times New Roman', Times; color: #000000; background: transparent"&gt;
       &lt;i&gt;CyTerra Government Investigation.&lt;/i&gt;&amp;#160;Since November
       2006, CyTerra has been served with civil and Grand Jury
       subpoenas by the DoD Office of the Inspector General and the DoJ
       and has been asked to facilitate employee interviews. The
       Company is cooperating fully with the U.S.&amp;#160;Government. The
       Company believes that it is entitled to indemnification for any
       course of defense related to this matter out of, and has made a
       claim against, a $15&amp;#160;million escrow fund established in
       connection with the Company&amp;#8217;s acquisition of CyTerra in
       March 2006.
   &lt;/div&gt;
   &lt;div style="margin-top: 6pt; font-size: 1pt"&gt;&amp;#160;
   &lt;/div&gt;
   &lt;div align="left" style="margin-left: 0%; margin-right: 0%; text-indent: 2%; font-size: 10pt; font-family: 'Times New Roman', Times; color: #000000; background: transparent"&gt;
       &lt;i&gt;Bashkirian Airways.&lt;/i&gt;&amp;#160;On July&amp;#160;1, 2004, lawsuits
       were filed on behalf of the estates of 31 Russian children in
       the state courts of Washington, Arizona, California, Florida,
       New York and New Jersey against Honeywell, Honeywell TCAS,
       Thales USA, Thales France, the Company and Aviation
       Communications&amp;#160;&amp;#038; Surveillance Systems (ACSS), which is
       a joint venture of L-3 and Thales. The suits relate to the crash
       over southern Germany of Bashkirian Airways Tupelov TU 154M
       aircraft and a DHL Boeing 757 cargo aircraft. On-board the
       Tupelov aircraft were 9 crew members and 60 passengers,
       including 45 children. The Boeing aircraft carried a crew of
       two. Both aircraft were equipped with Honeywell/ACSS Model 2000,
       Change 7 Traffic Collision and Avoidance Systems (TCAS). Sensing
       the other aircraft, the on-board DHL TCAS instructed the DHL
       pilot to descend, and the Tupelov on-board TCAS instructed the
       Tupelov pilot to climb. However, the Swiss air traffic
       controller ordered the Tupelov pilot to descend. The Tupelov
       pilot disregarded the on-board TCAS and put the Tupelov aircraft
       into a descent striking the DHL aircraft in midair at
       approximately 35,000&amp;#160;feet. All crew and passengers of both
       planes were lost. Investigations by the National Transportation
       Safety Board after the crash revealed that both TCAS units were
       performing as designed. The suits allege negligence and strict
       product liability based upon the design of the units and the
       training provided to resolve conflicting commands and seek
       approximately $315&amp;#160;million in damages, including
       $150&amp;#160;million in punitive damages. The Company&amp;#8217;s
       insurers have accepted defense of this matter and have retained
       counsel. The matters were consolidated in the U.S.&amp;#160;District
       Court for the District of New Jersey, which has dismissed the
       actions on the basis of forum non conveniens. The plaintiffs
       re-filed a complaint on April&amp;#160;23, 2007 with the Barcelona
       Court&amp;#8217;s Registry in Spain. On
   March&amp;#160;9, 2010, the court ruled in favor of the plaintiffs
       and entered judgment against ACSS in the amount of approximately
       $6.7&amp;#160;million, all of which represented compensatory
       damages. The Company believes that the verdict and the damages
       awarded are inconsistent with the law and evidence presented.
       Accordingly, ACSS filed an appeal of this ruling on
       April&amp;#160;27, 2010. The plaintiffs also filed an appeal of this
       ruling on the same date.
   &lt;/div&gt;
   &lt;div style="margin-top: 6pt; font-size: 1pt"&gt;&amp;#160;
   &lt;/div&gt;
   &lt;div align="left" style="margin-left: 0%; margin-right: 0%; text-indent: 2%; font-size: 10pt; font-family: 'Times New Roman', Times; color: #000000; background: transparent"&gt;
       &lt;i&gt;Gol Airlines.&lt;/i&gt;&amp;#160;A complaint was filed on
       November&amp;#160;7, 2006 in the U.S.&amp;#160;District Court for the
       Eastern District of New York against ExcelAire, Joseph Lepore,
       Jan Paul Paladino, and Honeywell. On October&amp;#160;23, 2007, an
       amended complaint was filed to include Lockheed, Raytheon,
       Amazon Technologies and ACSS. The complaints relate to the
       September&amp;#160;29, 2006 airplane crash over Brazil of a Boeing
       &lt;font style="white-space: nowrap"&gt;737-800&lt;/font&gt;
       operated by GOL Linhas Aereas Inteligentes, S.A. and an Embraer
       600 business jet operated by ExcelAire. The complaints allege
       that ACSS designed the TCAS on the ExcelAire jet, and assert
       claims of negligence, strict products liability and breach of
       warranty against ACSS based on the design of the TCAS and the
       instructions provided for its use. The complaints seek
       unspecified monetary damages, including punitive damages. The
       Company&amp;#8217;s insurers have accepted defense of this matter and
       have retained counsel. On July&amp;#160;2, 2008, the District Court
       dismissed the actions on the basis of forum non conveniens on
       the grounds that Brazil was the location of the accident and is
       more convenient for witnesses and document availability. On
       December&amp;#160;2, 2009, the U.S.&amp;#160;Court of Appeals for the
       Second Circuit upheld this decision. Some of the plaintiffs
       re-filed their complaints in the Lower Civil Court in the
       Judicial District of Peixoto de Azevedo in Brazil on
       July&amp;#160;3, 2009.
   &lt;/div&gt;
   &lt;/div&gt;
</NonNumbericText>
          <NonNumericTextHeader>&lt;!--DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd" --&gt;
   &lt;!-- Begin Block Tagged Note</NonNumericTextHeader>
          <FootnoteIndexer />
          <hasSegments>false</hasSegments>
          <hasScenarios>false</hasScenarios>
          <DisplayDateInUSFormat>false</DisplayDateInUSFormat>
        </Cell>
      </Cells>
      <OriginalInstanceReportColumns />
      <ElementDataType>us-types:textBlockItemType</ElementDataType>
      <SimpleDataType>textblock</SimpleDataType>
      <ElementDefenition>Includes disclosure of commitments and contingencies. This element may be used as a single block of text to encapsulate the entire disclosure including data and tables.</ElementDefenition>
      <ElementReferences>Reference 1: http://www.xbrl.org/2003/role/presentationRef
 -Publisher FASB
 -Name FASB Interpretation (FIN)
 -Number 14
 -Paragraph 3

Reference 2: http://www.xbrl.org/2003/role/presentationRef
 -Publisher FASB
 -Name Statement of Financial Accounting Standard (FAS)
 -Number 5
 -Paragraph 9, 10, 11, 12

</ElementReferences>
      <IsTotalLabel>false</IsTotalLabel>
    </Row>
  </Rows>
  <Footnotes />
  <NumberOfCols>1</NumberOfCols>
  <NumberOfRows>2</NumberOfRows>
  <HasScenarios>false</HasScenarios>
  <MonetaryRoundingLevel>UnKnown</MonetaryRoundingLevel>
  <SharesRoundingLevel>UnKnown</SharesRoundingLevel>
  <PerShareRoundingLevel>UnKnown</PerShareRoundingLevel>
  <HasPureData>false</HasPureData>
  <SharesShouldBeRounded>true</SharesShouldBeRounded>
</InstanceReport>
