<PAGE>   1
                       SECURITIES AND EXCHANGE COMMISSION

                             WASHINGTON, D.C. 20549

                                    FORM 10-Q


[X]  QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE
     ACT OF 1934 FOR THE QUARTERLY PERIOD ENDED MARCH 31, 1998

                                       OR

[ ]  TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES 
     EXCHANGE ACT OF 1934 FOR THE TRANSITION PERIOD FROM_________TO ________


                         Commission file number 0-18982

                             IEA INCOME FUND X, L.P.
             (Exact name of registrant as specified in its charter)


           California                                            94-3098648
 (State or other jurisdiction of                             (I.R.S. Employer
 incorporation or organization)                             Identification No.)

         444 Market Street, 15th Floor, San Francisco, California 94111
               (Address of principal executive offices)   (Zip Code)

                                 (415) 677-8990
              (Registrant's telephone number, including area code)


Indicate by check mark whether the registrant (1) has filed all reports required
to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during
the preceding 12 months (or for such shorter period that the registrant was
required to file such reports), and (2) has been subject to such filing
requirements for the past 90 days. Yes [X].  No [ ].


<PAGE>   2
                             IEA INCOME FUND X, L.P.

                  REPORT ON FORM 10-Q FOR THE QUARTERLY PERIOD
                              ENDED MARCH 31, 1998

                                TABLE OF CONTENTS



<TABLE>
<CAPTION>
                                                                               PAGE
<S>                                                                            <C>
PART I - FINANCIAL INFORMATION

 Item 1. Financial Statements

         Balance Sheets - March 31, 1998 (unaudited) and December 31, 1997      4

         Statements of Operations for the three months ended March 31, 
            1998 and 1997 (unaudited)                                           5

         Statements of Cash Flows for the three months ended 
            March 31, 1998 and 1997 (unaudited)                                 6

         Notes to Financial Statements (unaudited)                              7

 Item 2. Management's Discussion and Analysis of Financial Condition and 
            Results of Operations                                               10


PART II - OTHER INFORMATION

 Item 6. Exhibits and Reports on Form 8-K                                       14
</TABLE>


                                       2
<PAGE>   3
                         PART I - FINANCIAL INFORMATION


 Item 1. Financial Statements

         Presented herein are the Registrant's balance sheets as of March 31,
         1998 and December 31, 1997, statements of operations for the three
         months ended March 31, 1998 and 1997, and statements of cash flows for
         the three months ended March 31, 1998 and 1997.



                                       3
<PAGE>   4

                             IEA INCOME FUND X, L.P.

                                 BALANCE SHEETS

                                   (UNAUDITED)


<TABLE>
<CAPTION>
                                                                    March 31,        December 31,
                                                                      1998               1997
                                                                  ------------       ------------
<S>                                                               <C>                <C>         
                 Assets
Current assets:
   Cash and cash equivalents, includes $646,893 at March 31,
      1998 and $714,328 at December 31, 1997 in
      interest-bearing accounts                                   $    651,131       $    714,528
   Net lease receivables due from Leasing Company
      (notes 1 and 2)                                                  285,561            247,992
                                                                  ------------       ------------

         Total current assets                                          936,692            962,520
                                                                  ------------       ------------

Container rental equipment, at cost                                 17,121,582         17,249,260
   Less accumulated depreciation                                     7,584,377          7,391,011
                                                                  ------------       ------------
      Net container rental equipment                                 9,537,205          9,858,249
                                                                  ------------       ------------

                                                                  $ 10,473,897       $ 10,820,769
                                                                  ============       ============

            Partners' Capital

Partners' capital (deficit):
   General partner                                                $    (16,261)      $    (12,792)
   Limited partners                                                 10,490,158         10,833,561
                                                                  ------------       ------------

         Total partners' capital                                    10,473,897         10,820,769
                                                                  ------------       ------------

                                                                  $ 10,473,897       $ 10,820,769
                                                                  ============       ============
</TABLE>


   The accompanying notes are an integral part of these financial statements.



                                       4
<PAGE>   5
                             IEA INCOME FUND X, L.P.

                            STATEMENTS OF OPERATIONS

                                   (UNAUDITED)



<TABLE>
<CAPTION>
                                                         Three Months Ended
                                                      -------------------------
                                                       March 31,      March 31,
                                                        1998            1997
                                                      ---------       ---------
<S>                                                   <C>             <C>      
Net lease revenue (notes 1 and 3)                     $ 332,880       $ 329,422

Other operating expenses:
  Depreciation                                          250,237         256,302
  Other general and administrative expenses              12,987           8,602
                                                      ---------       ---------
                                                        263,224         264,904
                                                      ---------       ---------

    Earnings from operations                             69,656          64,518

Other income (loss):
  Interest income                                         8,559           7,315
  Net gain (loss) on disposal of equipment              (14,970)         11,911
                                                      ---------       ---------
                                                         (6,411)         19,226
                                                      ---------       ---------

    Net earnings                                      $  63,245       $  83,744
                                                      =========       =========

Allocation of net earnings:
  General partner                                     $  14,586       $  18,055
  Limited partners                                       48,659          65,689
                                                      ---------       ---------

                                                      $  63,245       $  83,744
                                                      =========       =========

Limited partners' per unit share of net earnings      $    1.24       $    1.68
                                                      =========       =========
</TABLE>



   The accompanying notes are an integral part of these financial statements.



                                       5
<PAGE>   6
                             IEA INCOME FUND X, L.P.

                            STATEMENTS OF CASH FLOWS

                                   (UNAUDITED)


<TABLE>
<CAPTION>
                                                             Three Months Ended
                                                          -------------------------
                                                          March 31,       March 31,
                                                            1998            1997
                                                          ---------       ---------
<S>                                                       <C>             <C>      
Net cash provided by operating activities                 $ 251,241       $ 386,892

Cash flows provided by investing activities:
  Proceeds from sale of container rental equipment           95,479          13,950

Cash flows used in financing activities:
  Distribution to partners                                 (410,117)       (385,613)
                                                          ---------       ---------


Net increase (decrease) in cash and cash equivalents        (63,397)         15,229


Cash and cash equivalents at January 1                      714,528         642,886
                                                          ---------       ---------


Cash and cash equivalents at March 31                     $ 651,131       $ 658,115
                                                          =========       =========
</TABLE>


   The accompanying notes are an integral part of these financial statements.



                                       6
<PAGE>   7

                             IEA INCOME FUND X, L.P.

                     NOTES TO UNAUDITED FINANCIAL STATEMENTS


(1)  Summary of Significant Accounting Policies

     (a) Nature of Operations

         IEA Income Fund X, L.P. (the "Partnership") is a limited partnership
         organized under the laws of the State of California on July 18, 1989
         for the purpose of owning and leasing marine cargo containers. Cronos
         Capital Corp. ("CCC") is the general partner and, with its affiliate
         Cronos Containers Limited (the "Leasing Company"), manages the business
         of the Partnership. The Partnership shall continue until December 31,
         2010, unless sooner terminated upon the occurrence of certain events.

         The Partnership commenced operations on January 17, 1990, when the
         minimum subscription proceeds of $1,000,000 were obtained. The
         Partnership offered 40,000 units of limited partnership interest at
         $500 per unit, or $20,000,000. The offering terminated on October 30,
         1990, at which time 39,206 limited partnership units had been
         purchased.

         As of March 31, 1998, the Partnership operated 3,943 twenty-foot, 1,128
         forty-foot and 93 forty-foot high-cube marine dry cargo containers.

     (b) Leasing Company and Leasing Agent Agreement

         Pursuant to the Limited Partnership Agreement of the Partnership, all
         authority to administer the business of the Partnership is vested in
         CCC. CCC has entered into a Leasing Agent Agreement whereby the Leasing
         Company has the responsibility to manage the leasing operations of all
         equipment owned by the Partnership. Pursuant to the Agreement, the
         Leasing Company is responsible for leasing, managing and re-leasing the
         Partnership's containers to ocean carriers and has full discretion over
         which ocean carriers and suppliers of goods and services it may deal
         with. The Leasing Agent Agreement permits the Leasing Company to use
         the containers owned by the Partnership, together with other containers
         owned or managed by the Leasing Company and its affiliates, as part of
         a single fleet operated without regard to ownership. Since the Leasing
         Agent Agreement meets the definition of an operating lease in Statement
         of Financial Accounting Standards (SFAS) No. 13, it is accounted for as
         a lease under which the Partnership is lessor and the Leasing Company
         is lessee.

         The Leasing Agent Agreement generally provides that the Leasing Company
         will make payments to the Partnership based upon rentals collected from
         ocean carriers after deducting direct operating expenses and management
         fees to CCC. The Leasing Company leases containers to ocean carriers,
         generally under operating leases which are either master leases or term
         leases (mostly two to five years). Master leases do not specify the
         exact number of containers to be leased or the term that each container
         will remain on hire but allow the ocean carrier to pick up and drop off
         containers at various locations; rentals are based upon the number of
         containers used and the applicable per-diem rate. Accordingly, rentals
         under master leases are all variable and contingent upon the number of
         containers used. Most containers are leased to ocean carriers under
         master leases; leasing agreements with fixed payment terms are not
         material to the financial statements. Since there are no material
         minimum lease rentals, no disclosure of minimum lease rentals is
         provided in these financial statement


                                                                     (Continued)



                                       7
<PAGE>   8

                             IEA INCOME FUND X, L.P.

                     NOTES TO UNAUDITED FINANCIAL STATEMENTS


     (c) Basis of Accounting

         The Partnership utilizes the accrual method of accounting. Net lease
         revenue is recorded by the Partnership in each period based upon its
         leasing agent agreement with the Leasing Company. Net lease revenue is
         generally dependent upon operating lease rentals from operating lease
         agreements between the Leasing Company and its various lessees, less
         direct operating expenses and management fees due in respect of the
         containers specified in each operating lease agreement.

     (d) Financial Statement Presentation

         These financial statements have been prepared without audit. Certain
         information and footnote disclosures normally included in financial
         statements prepared in accordance with generally accepted accounting
         procedures have been omitted. It is suggested that these financial
         statements be read in conjunction with the financial statements and
         accompanying notes in the Partnership's latest annual report on Form
         10-K.

         The preparation of financial statements in conformity with generally
         accepted accounting principles (GAAP) requires the Partnership to make
         estimates and assumptions that affect the reported amounts of assets
         and liabilities and disclosure of contingent assets and liabilities at
         the date of the financial statements and the reported amounts of
         revenues and expenses during the reported period. Actual results could
         differ from those estimates.

         The interim financial statements presented herewith reflect all
         adjustments of a normal recurring nature which are, in the opinion of
         management, necessary to a fair statement of the financial condition
         and results of operations for the interim periods presented.


(2)  Net Lease Receivables Due from Leasing Company

     Net lease receivables due from the Leasing Company are determined by
     deducting direct operating payables and accrued expenses, base management
     fees payable, and reimbursed administrative expenses payable to CCC and its
     affiliates from the rental billings payable by the Leasing Company to the
     Partnership under operating leases to ocean carriers for the containers
     owned by the Partnership. Net lease receivables at March 31, 1998 and
     December 31, 1997 were as follows:

<TABLE>
<CAPTION>
                                                             March 31,    December 31,
                                                               1998          1997
                                                             --------      --------
<S>                                                          <C>           <C>
         Lease receivables, net of doubtful accounts of
            $69,046 at March 31, 1998 and $44,032 at
            December 31, 1997                                $545,457      $544,082
         Less:
         Direct operating payables and accrued expenses       138,299       165,210
         Damage protection reserve                             65,179        68,241
         Base management fees                                  46,759        52,816
         Reimbursed administrative expenses                     9,659         9,823
                                                             --------      --------

                                                             $285,561      $247,992
                                                             ========      ========
</TABLE>



                                                                     (Continued)




                                       8
<PAGE>   9

                             IEA INCOME FUND X, L.P.

                     NOTES TO UNAUDITED FINANCIAL STATEMENTS


(3)  Net Lease Revenue

     Net lease revenue is determined by deducting direct operating expenses,
     base management fees and reimbursed administrative expenses to CCC from the
     rental revenue billed by the Leasing Company under operating leases to
     ocean carriers for the containers owned by the Partnership. Net lease
     revenue for the three-month periods ended March 31, 1998 and 1997 was as
     follows:


<TABLE>
<CAPTION>
                                                    Three Months Ended
                                                  -----------------------
                                                  March 31,     March 31,
                                                    1998         1997
                                                  --------      --------
<S>                                               <C>           <C>     
         Rental revenue                           $561,190      $594,436
         Less:
         Rental equipment operating expenses       147,432       190,471
         Base management fees                       38,966        41,092
         Reimbursed administrative expenses         41,912        33,451
                                                  --------      --------

                                                  $332,880      $329,422
                                                  ========      ========
</TABLE>





                                       9
<PAGE>   10
Item 2. Management's Discussion and Analysis of Financial Condition and Results
         of Operations

It is suggested that the following discussion be read in conjunction with the
Registrant's most recent annual report on Form 10-K.

1)   Material changes in financial condition between March 31, 1998 and December
     31, 1997.

     At March 31, 1998, the Registrant had $651,131 in cash and cash
     equivalents, a decrease of $63,397 from the December 31, 1997 cash
     balances. Net lease receivables at March 31, 1998 increased 13% when
     compared to December 31, 1997.

     The Registrant's cash distribution from operations for the first quarter of
     1998 was 7% (annualized) of the limited partners' original capital
     contribution, unchanged from the fourth quarter of 1997. These
     distributions are directly related to the Registrant's results from
     operations and may fluctuate accordingly. The cash distribution from sales
     proceeds for the first quarter of 1998 was 1% (annualized) of the limited
     partners' original capital contribution, unchanged from the fourth quarter
     of 1997. Sales proceeds distributed to its partners may fluctuate in
     subsequent periods, reflecting the level of container disposals.

     Market conditions that existed during 1997 persisted through the first
     quarter of 1998. Low container prices, favorable interest rates and the
     abundance of available capital continued to discourage ocean carriers and
     other transport companies from leasing containers at levels comparable to
     previous years. By the end of 1997, the volatility of the Hong Kong and
     other Asian financial markets began to negatively impact trade, shipping
     and container leasing. As a result, the Registrant's container utilization
     rate remained unchanged from December 31, 1997. Per-diem rental rates
     continued to remain under pressure as a result of the following factors:
     start-up leasing companies offering new containers and low rental rates in
     an effort to break into the leasing market; established leasing companies
     reducing rates to very low levels; and a continuing oversupply of
     containers. These leasing market conditions impacted the Registrant's
     financial condition and operating performance during the first quarter of
     1998.

2)   Material changes in the results of operations between the three-month
     period ended March 31, 1998 and the three-month period ended March 31,
     1997.

     Net lease revenue for the three-month period ended March 31, 1998 was
     $332,880, an increase of approximately 1% from the same period in the prior
     year. Gross rental revenue (a component of net lease revenue) for the
     three-month period ended March 31, 1998 was $561,190, a decline of 6% from
     the same period in the prior year. Gross rental revenue was primarily
     impacted by lower per-diem rental rates. Average per-diem rental rates
     declined 13% when compared to the same period in the prior year. The
     Registrant's average fleet size and utilization rates for the three-month
     periods ended March 31, 1998 and 1997 were as follows:


<TABLE>
<CAPTION>
                                                          Three Months Ended
                                                        ----------------------
                                                        March 31,    March 31,
                                                          1998        1997
                                                        ---------    --------
<S>                                                     <C>          <C>
         Average fleet size (measured in twenty-foot
            equivalent units (TEU))                       6,408       6,548
         Average Utilization                                 79%         74%
</TABLE>


     Rental equipment operating expenses were 26% of the Registrant's gross
     lease revenue during the three-month period ended March 31, 1998, as
     compared to 32% during the three-month period ended March 31, 1997. The
     decrease for the three-month period ended March 31, 1998 was largely
     attributable to a decrease in costs associated with higher utilization
     levels, including handling and storage.



                                       10
<PAGE>   11
     The Registrant disposed of 22 twenty-foot, 12 forty-foot and two forty-foot
     high-cube marine cargo containers during the first quarter of 1998, as
     compared to nine twenty-foot marine cargo containers during the same period
     in the prior year. The decision to repair or dispose of a container is made
     when it is returned by a lessee. This decision is influenced by various
     factors including the age, condition, suitability for continued leasing, as
     well as the geographical location of the container when disposed. These
     factors also influence the amount of sales proceeds received and the
     related gain on container disposals.

     As reported in the Registrant's Current Report on Form 8-K and Amendment
     No. 1 to Current Report on Form 8-K, filed with the Commission on February
     7, 1997 and February 26, 1997, respectively, Arthur Andersen, London,
     England, resigned as auditors of The Cronos Group, a Luxembourg Corporation
     headquartered in Orchard Lea, England (The "Parent Company"), on February
     3, 1997.

     The Parent Company is the indirect corporate parent of CCC, the General
     Partner of the Registrant. In its letter of resignation to the Parent
     Company, Arthur Andersen stated that it resigned as auditors of the Parent
     Company and all other entities affiliated with the Parent Company. While
     its letter of resignation was not addressed to CCC, Arthur Andersen
     confirmed to CCC that its resignation as auditors of the entities referred
     to in its letter of resignation included its resignation as auditors of CCC
     and the Registrant.

     CCC does not believe, based upon the information currently available to it,
     that Arthur Andersen's resignation was triggered by any concern over the
     accounting policies and procedures followed by the Registrant.

     Arthur Andersen's report on the financial statements of CCC and the
     Registrant, for years preceding 1996, has not contained an adverse opinion
     or a disclaimer of opinion, nor was any such report qualified or modified
     as to uncertainty, audit scope, or accounting principles.

     During the Registrant's 1995 fiscal year and the subsequent interim period
     preceding Arthur Andersen's resignation, there were no disagreements
     between CCC or the Registrant and Arthur Andersen on any matter of
     accounting principles or practices, financial statement disclosure, or
     auditing scope or procedure.

     The Registrant retained a new auditor, Moore Stephens, P.C. on April 10,
     1997, as reported in its Current Report on Form 8-K, filed April 14, 1997.

     In connection with its resignation, Arthur Andersen also prepared a report
     pursuant to the provisions of Section 10A(b)(2) of the Securities Exchange
     Act of 1934, as amended, for filing by the Parent Company with the
     Securities and Exchange Commission (the "SEC"). Following the report of
     Arthur Andersen, the SEC, on February 10, 1997, commenced a private
     investigation of the Parent Company for the purpose of investigating the
     matters discussed in such report and related matters. The Registrant does
     not believe that the focus of the SEC's investigation is upon the
     Registrant or CCC. CCC is unable to predict the outcome of the SEC's
     ongoing private investigation of the Parent Company.

     In 1993, the Parent Company negotiated a credit facility (herinafter, the
     "Credit Facility") with several banks for the use of the Parent Company and
     its affiliates, including CCC. At December 31, 1996, approximately
     $73,500,000 in principal indebtedness was outstanding under the Credit
     Facility. As a party to the Credit Facility, CCC is jointly and severally
     liable for the repayment of all principal and interest owed under the
     Credit Facility. The obligations of CCC, and the five other subsidiaries of
     the Parent Company that are borrowers under the Credit Facility, are
     guaranteed by the Parent Company.

     Following negotiations in 1997 with the banks providing the Credit
     Facility, an Amended and Restated Credit Agreement was executed in June
     1997, subject to various actions being taken by the Parent Company and its
     subsidiaries, primarily relating to the provision of additional collateral.
     This Agreement was further amended in July 1997 and the provisions of the
     Agreement and its Amendment converted the facility to a term loan, payable
     in installments, with a final maturity date of May 31, 1998. At December
     31, 1997, approximately $37,600,000 was outstanding under the Credit
     Facility.



                                       11
<PAGE>   12
     The terms of the Agreement and its Amendment also provide for additional
     security over shares in the subsidiary of the Parent Company that owns the
     head office of the Parent Company's container leasing operations. They also
     provided for the loans to Stefan M. Palatin, the Chairman of the Parent
     Company (the "Chairman") and its Chief Executive Officer (and a Director of
     CCC), of approximately $5,990,000 and $3,700,000 (totaling approximately
     $9,690,000) to be restructured as obligations of the Chairman to another
     subsidiary of the Parent Company. These obligations have been collaterally
     assigned to the lending banks, together with the pledge of 1,000,000 shares
     of the Parent Company's Common Stock owned by the Chairman. These 1,000,000
     shares represent 11% of the issued and outstanding shares of Common Stock
     of the Parent Company as of December 31, 1997. The shares of the Parent
     Company are traded on NASDAQ (CRNSF). (The Chairman, including the
     1,000,000 shares pledged to the banks, owns approximately 55% of the issued
     and outstanding shares of Common Stock of the Parent Company as of December
     31, 1997). Additionally, CCC granted the lending banks a security interest
     in the fees to which it is entitled for the services it renders to the
     container leasing partnerships of which it acts as general partner,
     including its fee income payable by the Registrant.

     The lending banks have indicated that they will not renew the Credit
     Facility, and the Parent Company has yet to secure a source for repayment
     of the balance due under the Credit Facility at May 31, 1998. CCC is
     currently in discussions with the management of the Parent Company to
     provide assurance that the management of the container leasing partnerships
     managed by CCC, including the Registrant, is not disrupted pending a
     refinancing or reorganization of the indebtedness of the Parent Company and
     its affiliates.

     The Registrant is not a borrower under the Credit Facility, and neither the
     containers nor the other assets of the Registrant have been pledged as
     collateral under the Credit Facility.

     The Registrant is unable to determine the impact, if any, these concerns
     may have on the future operating results and financial condition of the
     Registrant or CCC and the Leasing Company's ability to manage the
     Registrant's fleet in subsequent periods.

     Year 2000

     The Registrant relies upon the financial and operational systems provided
     by the Leasing company and its affiliates, as well as the systems provided
     by other independent third parties to service the three primary areas of
     its business: investor processing/maintenance; container leasing/asset
     tracking; and accounting finance. The Registrant has received confirmation
     from its third-party investor processing/maintenance vendor that their
     system is Year 2000 compliant. The Registrant does not expect a material
     increase in it vendor servicing fee to reimburse Year 2000 costs. Container
     leasing/asset tracking and accounting/finance services are provided to the
     Registrant by CCC and its affiliate, Cronos Containers Limited (the
     "Leasing Company"), pursuant to the respective Limited Partnership
     Agreement and Leasing Agent Agreement. CCC and the Leasing Company have
     initiated a program to prepare their systems and applications for the Year
     2000. Preliminary studies indicate that testing, conversion and upgrading
     of system applications is expected to cost CCC and the Leasing Company less
     than $500,000. Pursuant to the Limited Partnership Agreement, CCC or the
     Leasing Company, may not seek reimbursement of data processing costs
     associated with the Year 2000 program. The financial impact of making these
     required system changes is not expected to be material to the Registrant's
     financial position, results of operations or cash flows.



                                       12
<PAGE>   13
     Cautionary Statement

     This Quarterly Report on Form 10-Q contains statements relating to future
     results of the Registrant, including certain projections and business
     trends, that are "forward-looking statements" as defined in the Private
     Securities Litigation Reform Act of 1995. Actual results may differ
     materially from those projected as a result of certain risks and
     uncertainties, including but not limited to changes in: economic
     conditions; trade policies; demand for and market acceptance of leased
     marine cargo containers; competitive utilization and per-diem rental rate
     pressures; as well as other risks and uncertainties, including but not
     limited to those described in the above discussion of the marine container
     leasing business under Item 2., Management's Discussion and Analysis of
     Financial Condition and Results of Operations; and those detailed from time
     to time in the filings of Registrant with the Securities and Exchange
     Commission.



                                       13
<PAGE>   14
                           PART II - OTHER INFORMATION


Item 6.  Exhibits and Reports on Form 8-K

(a)  Exhibits

<TABLE>
<CAPTION>
    Exhibit
       No.                     Description                         Method of Filing
    -------                    -----------                         ----------------
<S>           <C>                                                  <C>
      3(a)    Limited Partnership Agreement of the                 *
              Registrant, amended and restated as of
              November 7, 1989

       3(b)   Certificate of Limited Partnership of the            **
              Registrant

       27     Financial Data Schedule                              Filed with this document
</TABLE>


(b)  Reports on Form 8-K

     No reports on Form 8-K were filed by the Registrant during the quarter
ended March 31, 1998.




-------------

*    Incorporated by reference to Exhibit "A" to the Prospectus of the
     Registrant dated November 7, 1989, included as part of Registration
     Statement on Form S-1 (No. 33-30245)

**   Incorporated by reference to Exhibit 3.2 to the Registration Statement on
     Form S-1 (No. 33-30245)



                                       14
<PAGE>   15
                                   SIGNATURES


        Pursuant to the requirements of the Securities Exchange Act of 1934, the
Registrant has duly caused this Report to be signed on its behalf by the
undersigned thereunto duly authorized.



                                    IEA INCOME FUND X, L.P.

                                    By   Cronos Capital Corp.
                                         The General Partner



                                    By    /s/ DENNIS J. TIETZ
                                         --------------------------------------
                                         Dennis J. Tietz
                                         President and Director of Cronos 
                                         Capital Corp. ("CCC")
                                         Principal Executive Officer of CCC



Date: May 15, 1998



                                       15
<PAGE>   16
                                  EXHIBIT INDEX



<TABLE>
<CAPTION>
Exhibit
  No.                     Description                         Method of Filing
-------                   -----------                         ----------------
<S>      <C>                                                  <C>
 3(a)    Limited Partnership Agreement of the                 *
         Registrant, amended and restated as of
         November 7, 1989

 3(b)    Certificate of Limited Partnership of the            **
         Registrant

 27      Financial Data Schedule                              Filed with this document
</TABLE>




-------------

*    Incorporated by reference to Exhibit "A" to the Prospectus of the
     Registrant dated November 7, 1989, included as part of Registration
     Statement on Form S-1 (No. 33-30245)

**   Incorporated by reference to Exhibit 3.2 to the Registration Statement on
     Form S-1 (No. 33-30245)