**NAS 9-97135**

**Modification 43**

**Page 2 of 4**

To implement the above, the following actions are taken:

1\. Paragraph 19. [Period of Performance]{.underline} is deleted in its
entirety and replaced with the following:

"19. [Period of Performance]{.underline}

> \(a\) The period of performance of this contract shall be April 5,
> 1999 through October 4, 2002.
>
> \(b\) In the event the Government elects to exercise its option(s)
> pursuant to the terms of the contract, the period of performance for
> each option shall be set forth below:
>
> [Option No.]{.underline} [Period of Performance]{.underline}
>
> 4 10/05/02 -- 12/04/02
>
> 5 12/05/02 -- 02/04/03
>
> 6 02/05/03 -- 04/04/03"

2\. Paragraph 21. [Total Estimated Cost]{.underline} is deleted in its
entirety and replaced with the following:

"21. [Firm-Fixed Price]{.underline}

The total firm-fixed price of this contract is
[\$6,122,935.94]{.underline}.

3\. Paragraph 23. [Option to Extend the Term of the Contract (52.217-9)
(MAR 1989)]{.underline} is deleted in its entirety and replaces with the
following:

"23. [Option to Extend the Term of the Contract (52.217-9) (MAR
1989)]{.underline}

> \(a\) The Government may extend the term of this contract by written
> notice to the Contractor within 30 days or more before the end of the
> period of performance, provided that the Government gives the
> Contractor a preliminary written notice of its intent to extend at
> least 60 days before the contract expires. The preliminary notice does
> not commit the Government to an extension.
>
> \(b\) If the Government exercises this option, the extended contract
> shall be considered to include this option provision. The resultant
> contract will include all terms and conditions of the basis contract,
> as it exists immediately prior to the exercise of the option, with the
> following changes:
>
> [Option 3]{.underline}
>
> Paragraph 19, entitled, "Period of Performance" shall be modified to
> change the period of performance of April 5, 1999 through April 4,
> 2002 to April 5, 1999 through October 4, 2002.

**NAS 9-97135**

**Modification 43**

**Page 3 of 4**

> Paragraph 21, entitled, "Firm-Fixed Price" shall be modified to
> reflect the following:
>
> The total firm-fixed price of this contract is
> [\$6,122,935.94]{.underline}.
>
> [Option 4]{.underline}
>
> Paragraph 19, entitled, "Period of Performance" shall be modified to
> change the period of performance of April 5, 1999 through October 4,
> 2002 to April 5, 1999 through December 4, 2002.
>
> Paragraph 21, entitled, "Firm-Fixed Price" shall be modified to
> reflect the following:
>
> The total firm-fixed price of this contract is
> [\$6,468,924.55]{.underline}.
>
> [Option 5]{.underline}
>
> Paragraph 19, entitled, "Period of Performance" shall be modified to
> change the period of performance of April 5, 1999 through December 4,
> 2002 to April 4, 1999 through February 4, 2003.
>
> Paragraph 21, entitled, "Firm-Fixed Price" shall be modified to
> reflect the following:
>
> The total firm-fixed price of this contract is
> [\$6,831,432.58]{.underline}.
>
> [Option 6]{.underline}
>
> Paragraph 19, entitled, "Period of Performance" shall be modified to
> change the period of performance of April 5, 1999 through February 4,
> 2003 to April 4, 1999 through April 4, 2003.
>
> Paragraph 21, entitled, "Firm-Fixed Price" shall be modified to
> reflect the following:
>
> The total firm-fixed price of this contract is
> [\$7,193,940.61]{.underline}.

4\. Paragraph 22. [Contract Funding (June 1990)]{.underline} is deleted
in its entirety and replaced with the following:

"22. [CONTRACT FUNDING (JUNE 1990)]{.underline}

> For purposes of payment of cost, and in accordance with the Limitation
> of Funds clause, the total amount allotted by the Government to this
> contract is \$4,626,346.53. This allotment is for accomplishment of
> the work as set forth in the Statement of Work and covers the
> following period: April 5, 1999 -- June 15, 2002.

**NAS 9-97135**

**Modification 43**

**Page 4 of 4**

5\. The following Accounting/Appropriation Data applies to this funding
action:

Purchase PR [Request No]{.underline}.
[Accounting/Appropriation]{.underline} [Amount]{.underline}
[Complete]{.underline}

02077GA7 P99-23-MU-NZ-VE-GA-2529-GA11 \$265,548.40 Y FS 52/PY 02
P99-23-MU-NZ-VE-GA-2529-GA11 \$ 9,451.60 Y FS 52/PY 01
283-10-01-TS-VE-GA-2529-GA11 \$205,000.00 Y FS 54/PY 02

Funding Recapitulation (shown for administrative purposes)

Prior Funding Total Funding

[Mod 42]{.underline} [This Mod]{.underline} [Mod 43]{.underline}

\$4,146,346.53 \$480,000.00 \$4,626,346.53

6\. All Task/Subtask Orders are revised to reflect the new period of
performance and the estimated cost of each task for the period of
performance of 4/05/02 -- 10/04/02. (See attachment 1)

7\. Labor Category and Rates Table is revised to include the labor
categories and rates for the basic extension and proposed options (See
attachment 2).

8\. Paragraph 24. [SUBMISSION OF INVOICES]{.underline} is deleted in its
entirety and replaced with the following:

"SUBMISSION OF INVOICES

Invoices furnished by the Contractor shall be distributed as follows:

NASA Johnson Space Center

Attn: (Distribute as indicated below)

2101 NASA Road One

Houston, TX 77058

[Distribute to:]{.underline} [No. of Copies]{.underline} [Phone
\#]{.underline}

Attn: BJ2/Ann E. Bronson, Contract Specialist Original \# 1 copy
281-483-9889

GT4/Robert T. Anderson, COTR 1 copy 281-483-8803

LF/Je Y. Chang, Cost Accounting 1 copy 281-483-0860

LI/Jody M. Kovski 1 copy 281-483-8616