TELESCOPE OPERATIONS

MAINTENANCE DAYS

Warning

Ensure personnel safety through effective communications and the two man rule. Notify people of telescope movements, before they're made! Fall protection is required at several PMU/PCT connection locations.

General

This procedure concerns support for routine maintenance day activities.

Maintenance Days

Per the schedule on routine maintenance days, operations from the Jansky Lab control room will be suspended. The dayshift operator will then proceed to the GBT site where they will work out of the warehouse to monitor and coordinate telescope activities until normal operations resume. Procedures to support these actions follow.

Info

The character ^ is used below to emphasize spaces between dialog elements.

Suspending Operations at the Jansky Lab Control Room

STEP	ACTION
1	Terminate observing routines per schedule.
2	Move the telescope to Access position (EL: 77.850 deg.) and AZ: 44.15 deg. unless requested otherwise. Insert stow pin. Disable AZ/EL drives.
3	Stow the sub reflector and retract prime focus boom if required. Disable these servo systems.
4	Release M&C antenna control.
5	Revoke antenna control via the Cleo Gateway application as needed to restrict access (see Cleo Gateway Management procedure).
6	Lockout antenna and take the antenna control lockout key.
7	Advise site via e-mail of the GBT Status.
8	Set the Scan Coordinator project ID to: JMAINT (It may be changed later if a particular project ID is needed for testing)
9	Reboot the control room Linux workstations as necessary: victor, naiad, titania, and arial. Use the commands *who* and *ps ^ -ef ^ ^ more* to see if anyone is logged in and what processes are running. The reboot may be delayed until the close of the maintenance period if necessary, or to a following maintenance day if circumstances warrant it.
10	Proceed to the GBT site with: Gate/warehouse and vehicle keys; Any items in the operator's in basket marked for the warehouse or servo room; Personal safety devices (hard hat, fall protection, safety glasses, etc. as needed).

GBT Site and Warehouse Office Duties

STEP	ACTION
1	Upon arrival, proceed to the servo room to lock out the AZ/EL servo system.
2	Attend to warehouse office duties:

Ensure only authorized individuals access the GBT
Ensure personnel sign in/out and adhere to two-person rule
Inform persons going on the GBT of any safety concerns or planned telescope moves
Make portable radios, locks/tags available
Monitor maintenance activities and update Ops Log
Complete steps 3 and 4 if required
Monitor communication systems and provide assistance as needed
Allow and revoke Cleo Gateway access permissions as needed
Monitor Cleo message window for system problems
Monitor VNC sessions for 43meter and 45ft operations
Monitor weather. Take appropriate actions as required (see GBT Weather Restrictions procedure)

STEP	ACTION
3	Should an AZ/EL move be required:

Notify all individuals of the move and ensure all have departed the tipping structure (refer to sign-in log)
Update eraser board to show where the operator is and that restricted access is in effect. Close site gate before proceeding to the GBT if the move will require an extended amount of time.
Remove the operators AZ/EL servo system lock; enable antenna control with lockout key
Coordinate the move with maintenance crews ensuring track is clear and checked thoroughly
Complete the move using M&C, OCU, MRU, PMU or PCT as the situation dictates (see Maintenance and Testing Support procedure)
Lockout AZ/EL servo system when the move is complete; disable antenna control with lockout key
Notify individuals when access is again permitted
Open site gate (if required) and resume warehouse office duties

STEP	ACTION
4	Should a turret, sub reflector, or prime focus move be required:

Advise individuals working near the system being moved to ensure safe distancing
Proceed to GBT and transfer control to the device you intend to use (PMU, PCT, OCU, etc.) (see Maintenance and Testing Support procedure)
Proceed to the servo system location (if required). Coordinate and complete the move for maintenance crews. When finished, store any portable maintenance units used and transfer servo control as necessary
Notify individuals when any access or area restrictions are lifted
Resume warehouse office duties

Resuming Operations at the Jansky Lab Control Room

STEP	ACTION
1	At the servo room/GBT: After mechanics walk-through inspection, complete the elevation tipping and azimuth rolling inspection. Pass antenna control to the OCT prior to leaving servo room. Remove the antenna control lockout key to take to lab control room.
2	Close down operations from the warehouse office: Log out and turn off the office workstations. Turn off appliances/radios. Turn off all lights. Gather any items to return to the control room.
3	Upon return to the control room: Return gate/warehouse and vehicle keys. Store personal safety devices. Update Ops log as necessary.
4	Restore antenna control via M&C. Make changes to Cleo Gateway access as needed.
5	Prepare for and resume normal operations.

-- DavidRose - 6 Feb 2008

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