AIA Operational Constraints

The AIA Operational Constraints Document covers the following areas:

  1. Introduction
    1. Scope
    2. Constraint Severity Definitions
    3. Procedure for Constraint or Restriction Violation
  2. Reference Documents
    1. Government Documents
    2. Non-Government Documents
  3. Flight Operational Constraints
    1. Thermal Constraints
      1. HOPA Temperature
      2. Primary Mirror Temperature Not To Exceed 35°C / 50°deg;C
      3. Decontamination Heater Thermostats
      4. Operational Heaters Only Work on 15A Service
    2. Mechanism Constraints
      1. Focus Motor Range Limits
      2. Invalid "Steps Complete" Count for a Focus Motor Autocenter
      3. Shutter Open/Close Timers Only Work in Operational Mode
      4. Do Not Use HOPA4 Primary Heater
    3. Camera System Constraints
      1. SEFI Monitoring
      2. Relative Voltages Between Vjd, Vdd, and Vod
      3. Relative Voltage Between Vog1 and Vog2
      4. Vrd Voltage
      5. Relative Voltage Between Vod and Vrd
    4. Sequencer Constraints
      1. Upload Tables Only When the Instrument is Idle
      2. Load Camera and DCHRI Tables Only When Sequencer Idle
      3. Only Perform a Time Jam When the Sequencer is Idle
      4. Start a Sequence Only When the Sequencer State is Idle.
      5. Only Run Sequencer with Mechanisms in Operational Mode
      6. Do Not Move Mechanisms Manually When Sequencer is Active
      7. Test Mode to Operational Mode Transition: First Move of Filterwheels
      8. Sequence Start after a Filterwheel Park
      9. Start Sequence with Focus Motors Near Their Sequence Positions
    5. Framelist Design and Single Frames
      1. Do Not Use DEFAULT Cadence in an FTS Table
      2. Do Not Perform a Clear Before a 1-Port or 2-Port Serial (EF or GH) Readout
      3. Ensure Sufficient Readout Delay
      4. Do Not Perform Long Focus Motor Moves With an Exposure on ATA 2
      5. Restrictions on Exposures Between 40 and 70 msec, Inclusive
    6. Power On / Off Operations
      1. Do Not Power Off if EEPROM is Active
      2. AIA Total Current Limit
      3. B-Side Processor Reboot When ISS Cards 2 and 3 Are Powered
      4. Default GT Axis Map
      5. Decontamination Heaters Off During HGA Deploy
    7. Image Stabilization System
      1. Prevent PZT Oscillation
      2. Closed Loop Operation Only in Science Mode
      3. Open Loop During Thruster Firings
      4. Prevent Interference With Spacecraft
      5. Keep PZTs and PZT Preamp above 15°C
    8. Known Error Messages and Software Idiosyncrasies
      1. Use of the aia_task_clear command
      2. Error Messages Following an Abort Command
      3. Memory Free Check
      4. Relay Hardware Status is Only Valid on the A-side
      5. Memory Protection Error Messages During Patches
    9. LMSAL EGSE Restrictions
      1. EGSE Crashes When Multiple Lines Pasted to Command Line
      2. Nedit and Other Programs Can Prevent EGSE From Starting
      3. Maximum Number of Screens
      4. Practical Limit to Number of Screens
      5. EGSE STOL Execution Halts On Display Line Overrun
      6. LMSAL EGSE Cannot Have A Telemetry Point In Multiple APIDs
      7. Text Items Can Only Have a Red High Limit
      8. Telemetry With Zero Timeout Treated As Always Current
      9. EGSE Database Update Only After Exiting EGSE
      10. Cut and Paste From and To the Command Console Crashes the EGSE
  4. Summary of Operations with Potential Issues
  5. Index of Subject Matter Expert Points of Contact
  6. Acronym List