MODIFICATION
16 -- NASA Gulfstream GV Synthetic Aperture Radar Request for Information (RFI)
- Notice Date
- 1/23/2018
- Notice Type
- Modification/Amendment
- NAICS
- 336413
— Other Aircraft Parts and Auxiliary Equipment Manufacturing
- Contracting Office
- NASA/Lyndon B. Johnson Space Center, Mail Code: BR, Houston, Texas, 77058-3696, United States
- ZIP Code
- 77058-3696
- Solicitation Number
- 80JSC018GVSAR
- Archive Date
- 2/23/2018
- Point of Contact
- Audrey C. Montgomery, Phone: 2817927510, Portia Simone Keyes, Phone: 2814833962
- E-Mail Address
-
audrey.c.montgomery@nasa.gov, portia.s.keyes@nasa.gov
(audrey.c.montgomery@nasa.gov, portia.s.keyes@nasa.gov)
- Small Business Set-Aside
- N/A
- Description
- The purpose of this amendment 1 to notice 80JSC018GVSAR is to post questions and answers received. The due date for responses has not been extended. There is no solicitation available at this time; all information presented is preliminary. Q1: In reference to that RFI, we understand the requested limit for responses is 15 pages. Does this page limit include: "2) Provide examples, if any, of existing antenna/radome/fuselage pod designs completed on aircraft other than Gulfstreams via sketches, drawings, or photographs" (reference Section 3.0 of the RFI instructions)? Given that some drawing packages may be sizeable based on the level of detail provided and that originals may not be on 8.5" x 11" paper, are multiple pages allowed to facilitate other size drawing? A1: The requested sketches, drawings, and photographs are not included in the page limitation. Q2: We understand that two (2) SAR antenna/radomes would be mounted on the Port (LH) side of the aircraft. If fuselage mounted, can we assume that the antennas can be mounted in-line (i.e. end to end) and the overall panel would be approximately 25" x 140" long overall? A2: The antennas can be mounted in-line (end to end) as long as they are canted ~45 degrees from vertical and have a clear view of the ground. Q3: Can the antennas be mounted side by side making a panel that is approximately 50"x 70"? A3: There are no technical issues with mounting the antennas side-by-side as long as they are canted ~45 degrees from vertical and have a clear view of the ground. Q4: Are there any special alignment, flatness tolerance, or stiffness requirements for the antenna mounting that need to be considered such that fuselage bending or pressurization in flight that could affect system performance? A4: There are no special alignment requirements assuming the antenna mounting screws will ensure installation repeatability to within a couple millimeters. The antenna mounting and the Inertial Navigation Unit (INU) mounting will be surveyed to determine their absolute locations relative to the aircraft coordinates. The antenna frame itself will ensure antenna flatness and stiffness. The INU will monitor any antenna movements caused by fuselage bending or pressurization in flight. Q5: If the antennas are to be wing mounted, will they need to be mounted both on the Port (LH) side or can the antennas be separated with one mounted on each wing (LH & RH Wing pods with both antenna arrays pointing in the port (LH) direction)? A5: The government envisioned that a two wing-pod solution would include antennas mounted on each wing with the arrays point in the port direction. Q6: Are there any Field of View (FOV) requirements emanating from the face of the panels that need to be considered? A6: There should be an unobstructed Field of View of the ground emanating from the face of the antenna panels. Q7: If the antennas are mounted within wing pods, will each pod have an LN-251 INS/GPS? A7: Each antenna, no matter where it is mounted, will have an LN-251 INS/GPS installed with it. Q8: Are there any distance restrictions between the LN-251 and the antennas? A8: There is no specific distance restrictions between the LN-251 (or comparable INU)and the antenna as long as the two units are mechanically tightly coupled with a rigid structure such that the INU will experience the same vibrations, fuselage bending and expansion as the antenna frame. Q9: Are there any distance restrictions between the antenna and the cabin rack mounted equipment? A9: No. Q10: Do the antennas require any special cooling provisions? A10: The L-band active array antenna may require cooling in low altitude flights, but no cooling is required for high altitude flights (> 26kft). So the answer is TBD. Q11: The provided figure of the antenna panel indicates that the external face is a radome surface. Does the antenna require a radome over this face or is the intent that the face as shown on the provided figure be exposed to free air? A11: The antenna radome is required. Q12: Can an alternate radome be proposed? A12: While the government would like to use the current antenna/radome to limit upgrade costs, the purpose of this RFI is to obtain data from industry that might be useful and does not limit vendors from highlighting alternative solutions. Q13: What certification status shall the aircraft have at the completion of the modification effort? A13: All permanent, major designs and modifications to the aircraft shall have DER signed, FAA Form 8110-3s associated with them. These Form 8110-33 will serve as the foundation for the submittal of a Form 337 to the Houston FSDO. Q14: What is the envisioned period of performance? A14: Up to four years. Q15: Shall both antennae be aimed in the same direction? A15: Yes, port-looking, 45-deg down from the horizon. Q16: What is the preferred arrangement of the antennae? (Side-by-side, in-line tandem, etc.) What arrangements other than the preferred one are acceptable? A16: There is no preferred arrangement of antennae so long as the arrangement meets the high level requirements noted in the RFI.
- Web Link
-
FBO.gov Permalink
(https://www.fbo.gov/notices/20ff8f1f5ff93858c9f3e7c120346026)
- Record
- SN04797043-W 20180125/180123231318-20ff8f1f5ff93858c9f3e7c120346026 (fbodaily.com)
- Source
-
FedBizOpps Link to This Notice
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