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<tbody>
<tr class="odd">
<td colspan="13"><strong>AMENDMENT OF SOLICITATION/MODIFICATION OF
CONTRACT</strong></td>
<td colspan="2"></td>
<td colspan="3"><blockquote>
<p>1. CONTRACT ID CODE</p>
</blockquote>
<p>     </p></td>
<td colspan="3"><blockquote>
<p>PAGE<br />
1 of 3</p>
</blockquote></td>
</tr>
<tr class="even">
<td colspan="4"><blockquote>
<p>2. AMENDMENT/MODIFICATION NO.</p>
</blockquote></td>
<td colspan="5"><blockquote>
<p>3. EFFECTIVE DATE</p>
</blockquote></td>
<td colspan="8"><blockquote>
<p>4. REQUISITION/PURCHASE NO.</p>
</blockquote></td>
<td colspan="4"><blockquote>
<p>5. PROJECT NO. <em>(If applicable)</em></p>
</blockquote></td>
</tr>
<tr class="odd">
<td colspan="4"><blockquote>
<p>3</p>
</blockquote></td>
<td colspan="5"><blockquote>
<p>May 15, 2002</p>
</blockquote></td>
<td colspan="8"><blockquote>
<p>199542</p>
</blockquote></td>
<td colspan="4"><blockquote>
<p>     </p>
</blockquote></td>
</tr>
<tr class="even">
<td colspan="3"><blockquote>
<p>6. ISSUED BY</p>
</blockquote></td>
<td colspan="5">CODE</td>
<td colspan="3"><blockquote>
<p>0613/TMB</p>
</blockquote></td>
<td colspan="9"><blockquote>
<p>7. ADMINISTERED BY <em>(If other than Item 6)</em> CODE</p>
</blockquote></td>
<td><blockquote>
<p>     </p>
</blockquote></td>
</tr>
<tr class="odd">
<td colspan="11"><blockquote>
<p>NASA Glenn Research Center<br />
Attn: Timothy M. Bober<br />
Technology Support Branch<br />
21000 Brookpark Road, Mail Stop 500-306<br />
Cleveland, OH 44135-3191</p>
</blockquote></td>
<td colspan="10"><blockquote>
<p>     </p>
</blockquote></td>
</tr>
<tr class="even">
<td colspan="12"><blockquote>
<p>8. NAME AND ADDRESS OF CONTRACTOR <em>(No., street, county, State and
Zip Code)</em></p>
</blockquote></td>
<td colspan="4"></td>
<td colspan="5"><blockquote>
<p>9A. AMENDMENT OF SOLICITATION NO.</p>
</blockquote></td>
</tr>
<tr class="odd">
<td colspan="12"><blockquote>
<p>To All Offerors/Bidders</p>
</blockquote></td>
<td colspan="4"></td>
<td colspan="5"><blockquote>
<p>RFQ3-199542</p>
<p>9B. DATED <em>(SEE ITEM 11)</em></p>
</blockquote>
<p>     </p>
<p>10A. MODIFICATION OF CONTRACT/ORDER NO.</p>
<p>     </p>
<p>10B. DATED <em>(SEE ITEM 13)</em></p></td>
</tr>
<tr class="even">
<td colspan="6">CODE      </td>
<td colspan="6"><blockquote>
<p>FACILITY CODE      </p>
</blockquote></td>
<td colspan="4"></td>
<td colspan="5"><blockquote>
<p>     </p>
</blockquote></td>
</tr>
<tr class="odd">
<td colspan="21"><blockquote>
<p><strong>11. THIS ITEM ONLY APPLIES TO AMENDMENTS OF
SOLICITATIONS</strong></p>
</blockquote></td>
</tr>
<tr class="even">
<td colspan="21"><p> The above numbered solicitation is amended as set
forth in Item 14. The hour and date specified for receipt of Offers is
extended, is not extended.<br />
Offers must acknowledge receipt of this amendment prior to the hour and
date specified in the solicitation or as amended, by one of the
following methods:</p>
<p>(a) By completing Items 8 and 15, and returning
<strong><u>   </u></strong> copies of the amendment; (b) By
acknowledging receipt of this amendment on each copy of the offer
submitted; or (c) By separate letter or telegram which includes a
reference to the solicitation and amendment numbers. <strong>FAILURE OF
YOUR ACKNOWLEDGMENT TO BE RECEIVED AT THE PLACE DESIGNATED FOR THE
RECEIPT OF OFFERS PRIOR TO THE HOUR AND DATE SPECIFIED MAY RESULT IN
REJECTION OF YOUR OFFER.</strong> If by virtue of this amendment you
desire to change an offer already submitted, such change may be made by
telegram or letter, provided each telegram or letter makes reference to
the solicitation and this amendment, and is received prior to the
opening hour and date specified.</p></td>
</tr>
<tr class="odd">
<td colspan="21"><blockquote>
<p>12. ACCOUNTING AND APPROPRIATION DATA <em>(If required)</em></p>
</blockquote></td>
</tr>
<tr class="even">
<td colspan="21"><blockquote>
<p>     </p>
</blockquote></td>
</tr>
<tr class="odd">
<td colspan="21"><blockquote>
<p><strong>13. THIS ITEM APPLIES ONLY TO MODIFICATIONS OF
CONTRACTS/ORDERS,<br />
IT MODIFIES THE CONTRACT/ORDER NO. AS DESCRIBED IN ITEM 14.</strong></p>
</blockquote></td>
</tr>
<tr class="even">
<td></td>
<td>A</td>
<td colspan="19"><p>THIS CHANGE ORDER IS ISSUED PURSUANT TO <em>(Specify
authority)</em>       THE CHANGES SET FORTH IN ITEM 14 ARE MADE IN THE
CONTRACT ORDER NO. IN ITEM 10A.</p>
<p>     </p></td>
</tr>
<tr class="odd">
<td></td>
<td><blockquote>
<p>B</p>
</blockquote></td>
<td colspan="19"><blockquote>
<p>THE ABOVE NUMBERED CONTRACT/ORDER IS MODIFIED TO REFLECT THE
ADMINISTRATIVE CHANGES <em>(Such as changes in paying office,
appropriation date, etc.)</em>       SET FORTH IN ITEM 14, PURSUANT TO
THE AUTHORITY OF FAR 43.103(b).</p>
<p>     </p>
</blockquote></td>
</tr>
<tr class="even">
<td></td>
<td><blockquote>
<p>C</p>
</blockquote></td>
<td colspan="19"><p>THIS SUPPLEMENTAL AGREEMENT IS ENTERED INTO PURSUANT
TO AUTHORITY OF:</p>
<p>     </p></td>
</tr>
<tr class="odd">
<td></td>
<td><blockquote>
<p>D</p>
</blockquote></td>
<td colspan="19"><blockquote>
<p>OTHER <em>(Specify type of modification and authority)</em></p>
<p>     </p>
</blockquote></td>
</tr>
<tr class="even">
<td colspan="21"><blockquote>
<p><strong>E. IMPORTANT: Contractor</strong> <strong>is not,</strong>
<strong>is required to sign this document and return <u>   </u> copies
to the issuing office.</strong></p>
</blockquote></td>
</tr>
<tr class="odd">
<td colspan="21"><blockquote>
<p>14. DESCRIPTION OF AMENDMENT/MODIFICATION <em>(Organized by UCF
section headings, including solicitation/contract subject matter where
feasible.)</em></p>
</blockquote></td>
</tr>
<tr class="even">
<td colspan="21"><blockquote>
<p>     </p>
</blockquote></td>
</tr>
<tr class="odd">
<td colspan="21">Except as provided herein, all terms and conditions of
the document referenced in Item 9A or 10A, as heretofore changed,
remains unchanged and in full force and effect.</td>
</tr>
<tr class="even">
<td colspan="10"><blockquote>
<p>15A. NAME AND TITLE OF SIGNER <em>(Type or print)</em></p>
</blockquote></td>
<td colspan="11"><blockquote>
<p>16A. NAME AND TITLE OF CONTRACTING OFFICER <em>(Type or
print)</em></p>
</blockquote></td>
</tr>
<tr class="odd">
<td colspan="10"></td>
<td colspan="11">Timothy M. Bober, Contracting Officer</td>
</tr>
<tr class="even">
<td colspan="7"><blockquote>
<p>15B. CONTRACTOR/OFFEROR</p>
</blockquote></td>
<td colspan="3"><blockquote>
<p>15C. DATE SIGNED</p>
</blockquote></td>
<td colspan="9"><blockquote>
<p>16B. UNITED STATES OF AMERICA</p>
</blockquote></td>
<td colspan="2"><blockquote>
<p>16C. DATE SIGNED</p>
</blockquote></td>
</tr>
<tr class="odd">
<td colspan="7">BY_________________________________________</td>
<td colspan="3"></td>
<td colspan="9">BY_________________________________________</td>
<td colspan="2">     </td>
</tr>
<tr class="even">
<td colspan="7"><em>(Signature of person authorized to sign)</em></td>
<td colspan="3"></td>
<td colspan="9"><em>(Signature of Contracting Officer)</em></td>
<td colspan="2"></td>
</tr>
<tr class="odd">
<td colspan="5">NSN 7540-01-152-8070<br />
PREVIOUS EDITION NOT USABLE</td>
<td colspan="9">30-105</td>
<td colspan="7"><strong>STANDARD FORM 30 (REV. 10-83) (GRC Overprint
09/01)</strong><br />
Prescribed by GSA<br />
FAR (48 CFR) 53.243</td>
</tr>
</tbody>
</table>

The following questions and answers are hereby provided:

Q1. How much on-site contractor support is anticipated?

# A: Kick-off meeting plus support acceptance testing. See Q7.

Q2. To clarify the division of design services described in the
solicitation, what portions of the PDU will GRC design, and what
portions will be the contractor's responsibility?

**A: GRC will provide requirements definition and preferences for
circuit topologies.**

Q3. Is the desired circuit design concept focused only on the power
controller module to the exclusion of the input module, power controller
cage, and distribution module described in the solicitation?

**A: Yes.**

Q4. We assume the five prototype circuit boards are the power control
modules?

**A: Yes**

Q5. Can the prototype circuit be comprised of more than one circuit
board?

**A: Yes.**

Q6. Do you expect the contractor to design the mechanical housing as
well?

**A: No.**

Q7. Do you anticipate on-site contractor support during NASA's corona
testing?

**A: Yes, viz. Initial test set-up \~ 2-3 days typical if initial corona
tests prove successful.**

Q8. Do you have a specification for the heat sink used for corona
testing, or do you expect the contractor to design it?

**A: GRC will supply one to interface with your product.**

Q9. Do you require the delivery of an external hardware/software control
system to corona test the prototypes?

**A: Yes, if your design requires one to operate.**

Q10. If so, can the controls be COTS suitable to rapid prototyping, or
is a flight-like configuration preferred?

**A: Yes.**

Q11. Also, if controls are required, is a software package acceptable
for the command interface?

**A: Yes.**

Q12. Which I/O protocol physical layers are available? Discrete digital?
RS232? CAN? Ethernet? 1553B?

**A: 1553B.**

Q13. Is there a preferred I/O protocol physical layer?

**A: 1553B.**

Q14. Has a similar contract been let before in response to solicitation
RFQ3-161100?

**A: Yes.**

Q15. If so, are the lessons learned from the previous prototype
development effort available to improve the quality of this effort?

**A: No.**

Q16. Is there an incumbent developer already working with GRC on this
effort?

**A: No.**

The close date for receipt of offers remains unchanged at May 17, 2002
4:30 pm local time.