Exhibit_1_NWS_EBH_6-503-2_Work_Card_2-0230.pdf

MAN

MIN

WORK

AREA

WORK UNIT

INSPECTION

REQUIREMENTS

ELECT PWR SERVICE CARD NO.

2-030

SYS SUB-SYS

CARD NO. WORK AREA

TYPE MECH MECH NO. CARD TIME

PUBLICATION NUMBER

NWS EHB 6-503-2

Sheet 1 of 6

1. Antenna/Pedestal, Azimuth DC Servo Motor UD2A1A3B1, and Elevation DC Servo Motor UD2A1A1B1 motor brushes; inspect and clean. (Reference NWS EHB 6-518)

HIGH VOLTAGE. Transmitter is in standby with high voltage off and low voltage power supplies on for this procedure. For your personal safety, ensure that detailed procedures for securing the system are followed. Electrical voltages may cause severe shock or DEATH on contact.

WARNINGS

025 350

2-030 1C8X1 2

OFF OUT

Semi-Annual Inspection (168 Day)

RA133W17CQ0021

Exhibit 1

PUBLICATION NUMBER

NWS EHB 6-503-2

Sheet 2 of 6

Semi-Annual Inspection (168 Day)

INSPECTION

REQUIREMENTS

ELECT PWR

OFF

SERVICE

OUT

CARD NO.

2-030

RADOME ENTRY HATCH. During any pedestal maintenance operation, if the radome entry hatch is left open, people on the ground or between the ground and platform level must wear ANSI approved hard hats at all times. An item falling through the opening may result in severe personal injury or DEATH.

ELEVATED WORK PLATFORM. Use all handrails, safety chains, safety harnesses, safety rails, and ladders properly while servicing the antenna pedestal and tower. Install all safety equipment and ladders prior to maintenance tasks. Severe injury or DEATH may occur from impacting the surface below.

WARNINGS - Cont.

Sheet 3 of 6

Semi-Annual Inspection (168 Day)

INSPECTION

REQUIREMENTS

ELECT PWR

OFF

SERVICE

OUT

CARD NO.

2-030

NOTE

The NEXRAD radome is classified as a Permit Required - Confined Space. The radome contains electrical (150 VDC max and 120 VAC at slip rings) and/or mechanical/physical (moving antenna) hazards. Completion of the Lockout/Tagout (LO/TO) shutdown steps eliminates the hazards and allows reclassification of the radome as a Non - Permit Required - Confined Space. Reversal of these steps negates the reclassification and the space reverts to a Permit Required - Confined Space.

A. Azimuth DC Servo Motor UD2A1A3B1 motor brushes (Qty 4); inspect and clean.

1. Get local control of system and place in standby per TABLE 1 in the Introduction Section, steps 1 through 4.

2. Remove high voltage from the Transmitter per TABLE 1 in the Introduction Section, steps 10, 14, and 15.

3. Remove Antenna/Pedestal Drive Motor power per TABLE 1 in the Introduction Section, steps 16 through 18.

4. Secure the Antenna/Pedestal per TABLE 1 in the Introduction Section, steps 20 through 22.

MKarbowski Highlight

Sheet 4 of 6

Semi-Annual Inspection (168 Day)

INSPECTION

REQUIREMENTS

ELECT PWR

OFF

SERVICE

OUT

CARD NO.

2-030

5. On the motor housing, clean the area around each motor brush cap with damp cloth and mild detergent.

6. Remove each motor brush assembly (brush cap and motor brush assembly) one at a time from the motor. Note orientation of the motor brush assembly as it is removed.

7. Inspect each component of the motor brush assembly for damage or corrosion.

8. Measure each motor brush for a minimum length using a machinist ruler. Replace ALL motor brushes if any one motor brush is less than 0.275 inches long.

9. Install the motor brush assembly. Ensure that motor brush orientation is the same as it was when it was removed.

10. Repeat steps 6 through 9 for each motor brush assembly.

11. Remove Manual Drive Assembly UD2A1A3A1 and inspect tachometer for damage and remove motor brush debris with a soft bris-tle brush.

12. Install Manual Drive Assembly UD2A1A3A1.

JWilliams

Sheet 5 of 6

Semi-Annual Inspection (168 Day)

INSPECTION

REQUIREMENTS

ELECT PWR

OFF

SERVICE

OUT

CARD NO.

2-030

B. Elevation DC Servo Motor UD2A1A1B1 motor brushes (Qty 4); inspect and clean.

1. On the motor housing, clean the area around each motor brush cap with damp cloth and mild detergent.

2. Remove each motor brush assembly (brush cap and motor brush assembly) one at a time from the motor. Note orientation of the motor brush assembly as it is removed.

3. Inspect each component of the motor brush assembly for damage or corrosion.

4. Measure each motor brush for a minimum length using a machinist ruler. Replace ALL motor brushes if any one motor brush is less than 0.275 inches long.

5. Install the motor brush assembly. Ensure that motor brush orientation is the same as it was when it was removed.

6. Repeat steps 2 through 5 for each motor brush assembly.

7. Remove Manual Drive Assembly UD2A1A1A1 and inspect tachometer for damage and remove motor brush debris with a soft bristle brush.

MKarbowski Highlight

JWilliams

Sheet 6 of 6

Semi-Annual Inspection (168 Day)

INSPECTION

REQUIREMENTS

ELECT PWR

OFF

SERVICE

OUT

CARD NO.

2-030

8. Install Manual Drive Assembly UD2A1A1A1.

9. Restore the Antenna/Pedestal per TABLE 2 in the Introduction Section, steps 1 through 2.

10. Restore Antenna/Pedestal Drive Motor power per TABLE 2 in the Introduction Section, steps 5 through 7.

11. Restore Transmitter high voltage per TABLE 2 in the Introduction Section, steps 8, 10, 13, and 14.

12. Restore system operation per TABLE 2 in the Introduction Section, steps 20 and 21.

13. Return control of RDA to the RPG per TABLE 2 in the Introduction Section, step 22.