posted 01-14-2007 07:32 PM               

The numbers after the "-" are the sub-part number, or version of the item. There might be a right-hand version called -101, and a left-hand version called -102. Or the item might have 5 parts, each with its own dash number.

posted 03-20-2013 05:05 PM            

• Position 1. Letter 'S' designates the NASA center.

• Position 2.
  A Arrangement Drawing
  B Master Plan Drawing
  C Construction Drawing
  D Detailed Assembly Drawing
  E Assembly Drawing
  F Erection Drawing
  G Installation Drawing
  H Wiring Harness Drawing
  I Diagram Drawing
  J Kit Drawing
  K Book Form Drawing
  L Envelope Drawings

• Position 3.
  A Gemini
  B Apollo
  C Skylab A and B (formerly Apollo Applications Program)
  D Space Shuttle
  E Earth Resources
  F Apollo-Soyuz Test Program
  G Space Station Program
  H Constellation Program
  K X-Crew Return Vehicle
  M Russian-Mir Program
  N New Initiatives or Advanced Programs
  W Institutional Programs
  Y Developmental (non-program oriented)
  Z Multiprogram applications

• Positions 4 and 5
  11 Environmental System
  12 Crew Personnel Equipment
  13 Space Suits
  14 Waste System
  15 Development Flight Instrumentation.
  16 Operational Instrumentation/Communication
  17 Field Testing Instrumentation
  18 Scientific Instrumentation Communication
  19 Stabilization and Control System
  20 Guidance and Navigation Control System
  21 Abort Guidance System
  22 Solid Propellant Motors
  23 Liquid Propulsion Systems
  24 Reaction Control Systems
  25 Power Generators
  26 Pyrotechnics
  27 Spacecraft Structures
  28 Heat Protection
  29 Mechanical Systems
  30 Earth Landing
  31 Planetary Landing
  32 Crew Station
  33 Crew Operation Equipment
  34 Recovery Support Equipment
  35 (Inactive)
  36 Developmental, Experimental Eq. and Test Facilities
  37 Spacecraft Models (Wind Tunnel/Free Flight)
  39 Experimental Equipment (Flight)
  38 Ground Support Equipment
  40 Survival Equipment
  41 Operating Logic Schematics
  42 Bio-instrumentation
  43 Crew Trainers and Simulators
  44 Concept Design Category
  45 Spacecraft Operational Profile
  46 Life Sciences Experiments
  47 Scanning Sensing Systems
  48 Food Systems
  50 Classified Drawings (of any equipment)
  51 X-38 Crew Return Vehicle
  52 Bio-Medical Equipment

• Drawing Sequence number, so for SEB12100030 it would be 100030

• Dash numbers
  Numbers -001 to -099, -101 to -199, and -201 to -299 are reserved for individual components or detailed parts on detail drawings.

• Other ranges have different specialist meanings.