SOW_2_Visibility_Enclosure_S100-2MT5A1_20_Nov_2024-R.docx

Statement of Work Repair and Recondition of the Automated Surface Observing System (ASOS) Visibility Enclosure

ASN: S100-2MT5A1, NSN: 5975-01-375-4808

Version: November 20, 2024

Description: The Contractor shall repair, recondition and paint the Visibility Enclosure to "Like New" operating condition, including cosmetic appearance in accordance with National Weather Service specifications. The repair, recondition and paint price shall include the parts, materials, labor, inspection and return shipping necessary to return the Visibility Enclosure to operational specifications. Repair materials or specifications differing from the NWS source specification must be approved by the National Weather Service prior to use.

Definition:

(a) Supplies: includes but is not limited to raw materials, components, intermediate assemblies, end products, and various supplies.

(b) Repair and Reconditioning: As outlined in Description of Work paragraph below.

(c) “Like New” Condition means reconditioned to the listed specification to meet all applicable electrical, mechanical, and cosmetic specifications and engineering documentation, including the replacement of damaged, missing, or non-functioning parts.

Government Furnished Equipment: The NRC will furnish the Visibility Enclosures to be repaired and reconditioned. If requested, the NRC can supply the AAK power supply (S100- 2MT5A1PS1), baseplate heater with thermostat, or controller board. The vendor is responsible for other replacement electronic parts and any needed supplies.

Government Furnished Data: None.

Vendor Furnished Equipment: The vendor is responsible for all electronic equipment (refer to GFE equipment) and supplies. The paint used should be similar to Sherwin-Williams F8W2030 (WAEM-511 GMC White).

Required Equipment and Supplies: The following part numbers for C1 and C2 (large blue capacitors) are being provided as the only options for use in repair of these assemblies.

· C1

STATEMENT OF WORK 2 – ENCLOSURE ASSEMBLY

· C2 Primary P/N: CGR303U030W4C

· Mfr: Cornell Dubilier/Mallory

· Alternate P/N: CGS313U050W4C

· Mfr: Cornell Dubilier/Mallory

· Alternate P/N: 23F303G030EF1H1

· Mfr: Genteq

· Primary P/N: CGR153U030V3L

· Mfr: Cornell Dubilier/Mallory

· Alternate P/N: CGS153U050V4C

· Mfr: Cornell Dubilier/Mallory

· Alternate P/N: 23F153G030DE1H1

· Mfr: Genteq

Description of Work – Work Procedures:

Inspect the S100-2MT5A1, Visibility Enclosure for major defects. If none found, proceed with the repair. If major defects exist that would prevent the repair of the unit, contact NRC with any comments, questions, or concerns.

The following steps may be accomplished in any order deemed necessary by the vendor. Disassemble the unit, including latch hardware.

Inspect the EMI gasket and replace this gasket if torn.

Strip, clean, and prep as necessary, then prime and paint the enclosures and any painted parts as needed. Care should be taken not to paint any grounding points or authorized labels. Allow the paint to properly cure before attempting any further repairs. Paint for corrosion control and the cosmetic appearance should be considered like new and meet NRC Final Acceptance criteria.

Inspect electrical wiring; power supplies, connectors, circuit cards and components for corrosion, physical damage, electrical damage, or excessive discoloration due to overheating. Repair unacceptable parts as needed.

Ensure the following Fuses are the correct rating and in the proper location (replace as required):

· Electronics Power Supply Fuse (S100-2MT5A1A3F2)

· FUSE, FAST-BLO CARTRIDGE/GLASS TUBE,

· 1/4" X 1-1/4", 0.25A/250V,

· Suggested Source P/N: LITTELFUSE P/N 312250, BUSSMAN P/N AGC-1/4

· The ¼ amp, 250 V, AGC fuse provides power to the electronics power supply.

· 24 V Transformer Fuse (S100-2MT5A1A3F1)

· FUSE, SLO-BLO CARTRIDGE/GLASS TUBE,

· 1/4" X 1-1/4", 3.0A/250V,

· Suggested Source P/N: LITTELFUSE P/N 313003, BUSSMAN P/N MDL-3, MIL SPEC F02B250V3A

· The 3 amp, 250 V, 3AG fuse provides power to the 120 VAC transformer, bridge rectifier, and capacitor C1 of the 24V heater power supply.

· 24V Regulator Fuse (S100-2MT5A1A3A1F1)

· FUSE, NORMAL-BLO CARTRIDGE/GLASS TUBE,

· 1/4" X 1-1/4", 15.0A/32V,

· Suggested Source P/N: LITTELFUSE P/N 311015, BUSSMAN P/N AGC-15

· The 15 amp, 32V, AGC fuse provides power to the 24V regulator board and capacitor C2 of the 24V heater power supply.

· 24 V Heater Fuse on Processor Backplane Board (S100-2MT5A1F1)

· FUSE, CERAMIC TUBE, 3AB, NORMAL-BLO

· 1/4" X 1-1/4", 10.0A/250V,

· Suggested Source P/N: EATON-BUSSMAN P/N BK/ABC-10-R

· The 10 amp, 250 V, 3AB fuse provides regulated 24 VDC continuous power to the transmitter and receiver lens heaters, to the day/night sensor, and to the Cabinet 40°F Temperature Sensor, then to the transmitter and receiver hood and electronics heaters when the outside temperature of the electronics enclosure is 40°F or less. This fuse is often referred to as the “stand-up fuse on the processor backplane board.”

Reassemble the unit, replacing all missing, corroded, or worn hardware.

Apply a small amount of anti-seize compound onto each latch bolt before reusing.

Apply 115VAC to the input AC Terminals. Verify all voltages, including the +5Vdc, +15Vdc, and the -15Vdc are passing. Adjust the 24Vdc Regulator to 25.50 Vdc +/- .25Vdc.

Connect a laptop with RS232 Serial Port running a terminal emulation program. The terminal emulation program will need to be running at 2400 Baud with the parity, data bits, stop bit set to N-8-1. Press the reset button on the processor card and verify a startup message is displayed on the laptop. Verify the firmware version is 40.0. Run all processor diagnostics using the VG command. The password needed will be EIEIO. Any self-test that does not pass requires corrective action as needed. A passing self-test will be of the form VPDX.XXXXXPPPP PPP0PP PPP PPPP XXX.XX. The ‘X’s in the string will be replaced with the applicable values. Note that the ‘P’s stand for pass. See Figure 1 for more information on what each individual character is for.

If Field Discrepancy says Inside Ambient Temperature is wrong, replace Digital Power Supply. Visibility Enclosure test results must pass to be considered like new and meet NRC Final Acceptance criteria. Call NRC if there are any questions or concerns.

Return fully functional and reconditioned Visibility Enclosures to NRC for evaluation by the NRC’s Instrument Inspection Unit.

Warranty Terms: Vendor will provide a 1-year warranty against material workmanship and against faults occurring during operation. This 1-year warranty will begin after passing the final equipment inspection and acceptance for stock.

NRC Final Acceptance: All repaired and reconditioned units will be inspected for material workmanship and electronic operation at the NRC. To meet the material workmanship requirements, the Visibility Enclosure will need to be in a “Like New” operating condition for example the unit’s cables, connectors, gaskets, and associated hardware. All soldering connections and connectors/pins will be inspected to ensure no corrosion is present and the correct parts are installed. Soldering and circuit board repair shall be in accordance with DOD-STD-2000 or commercial equivalent. The final finish should be consistent with a professional paint finish. The final finish should be uniform in color, glossiness and texture. The finish must be durable in an outdoor environment. It is recognized that minor defects such as paint drips or overspray may occur, however these should be kept very minimal. To verify the proper electronic operation of the Enclosures, the units will be placed in the ASOS system with a Visibility Sensor connected to it. The Instrument Inspection Unit will verify the Enclosure will pass its diagnostics test, the heaters function properly in the enclosure and sensor, and the Enclosure communicates properly with the ASOS system. Any inspected item that does not meet the acceptance criteria will be returned to the vendor for rework at no additional cost to the government.

Deliverables: Each repaired and reconditioned Visibility Enclosure, by serial number, shall be supplied with a Repair Report documenting the repair, reconditioning, and inspection to include results of all tests and failure analysis.

Shipping Address:

NATIONAL RECONDITIONING CENTER (NRC) 14200 MERRITT RD.

GRANDVIEW, MO. 64030

Transportability: Vendor is responsible for returning repaired products in a shipping container designed to withstand the vibration and shock encountered during transportation by ship, rail, truck, and aircraft. The units shall be packaged to prevent damage to include: physical, electrical, mechanical, cosmetic, and the units shall not be damaged or lose performance capability.

Final Note: When unforeseen problems arise, that may need technical clarification, please contact the Contracting Official who will notify the NRC. If the unit has any problem that prevents a quality repair, do not work on the item until the issue can be resolved.

NRC Reviewed:

WSRB Repair Branch Review: Marcus Stevenson, Branch Chief, November 20, 2024 TI&MR Branch Review: Gregory Flores, Branch Chief, November 20, 2024

VG Command - Visibility Sensor Extended Diagnostics

VPD0.29712PPPP PPPOPP PPP PPPP 31.0 FF

-.-·-···--·--··-···.... . Y.PDX.XXXXX.PP.PP...P.P-P-OPP.P-P.P-PP-P-P..XXXX-X-X ·-II sensor ID -- I Sensor Status P/F Day/Night Status DIN

RAM Check P/F --------------..J

Receiver Hood Heater P/F

Day/Night Window Heater P/F Receiver Electronics Heater P/F .1 Transmitter Electronics Heater P/F Day/Night'Electronics Heater P/F Enclosure Electronics Heater P/F '

Inside Ambient Temperature Checksum ------------------------------- J

Figure 1