Table 38. Flight-Phase Definitions
    Flight Phase Description
         0       SRM auxiliary thrust phase
         1       First-stage thrust phase if no auxiliary SRM's carried, or
                 First-stage thrust phase after SRM separation
         1.5     Attitude-control phase after first-stage thrust phase or between
                         first and second-thrust phases
         2       Second-stage thrust phase
         2.5     Attitude-control phase after second thrust phase or between
                         second and third-thrust phases
         3       Third-stage thrust phase, or third thrust phase if second stage is
                 restartable
         3.5     Attitude-control phase after third thrust phase or between
                         third and fourth thrust phases
         4       Fourth thrust phase, or
                 Upper stage/payload thrust phase
         5       Attitude control phase after Flismt Phase 4, or orbital phase

In some cases, two•flight phases are listed opposite an entry, e.g., 2 and 5. This means
that some failure or anomalous behavior occurred during the second-stage thrusting
period that did not prevent the attainment of an orbit, but did result in an abnormal
final orbit. Other somewhat arbitrary decisions were necessary in assigning a flight
phase when an expended stage failed to separate, or an upper stage failed to ignite. If,
for example, the first and second stages failed to separate, any of flight phase 1, 1.5, or 2
could be assigned, depending on the exact cause of the failure. The detailed
information needed to make the proper choice was sometimes lacking.
Table 39 is provided to assist in understanding how flight phases were assigned for
Atlas, Delta/Thor, and Titan vehicles.
                     Table 39. Flight Phases by Launch Vehicle
·Flight Phase Atlas                    Deltall'hor             Titan
      0       Castor burn              Castor /GEM burn        SRMsolo
      1       Atlas booster            First-stage bum         Stage 1
      1.5     Booster separation       Vernier solo - Sep 1/2 Stage-1 separation
      2       Sustainer                Second-stage bum        Stage 2
      2.5     Vernier/ACS solo         Coast between stg 2 / 3 Vernier solo
      3       Agena/Centaur            Third-stage bum         TS/Centaur/IDS
      3.5      -                       Coast after stg 3        -
      4       Second bum               Second bum              Second burn
      5       Orbit                    Orbit                   Orbit                        !


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