                                                                 GE 2/18/99

                          E19 Science Data Losses

030-02:46 - 049-23:55; Lost TFs in brackets[.....] Changes in Bold

 Time (GMT)  DSS  Reference    RT  Rcvd  Events             Comments  Cause  Pass
                              TFs                                            #
                             Lost  from

                                    PPT

 031-10:23    43  DR# A3365     3        - The entire       - Lost        F  3401
                                         experienced a      TFs
 -> 10:57                                power outage       [40597 ->
                                         causing the loss   40599] 12
                                         of the last three  RS VCDUs
                                         TFs from this
                                         support.

 031-11:05    63  DR# L2949     4        - The antenna      - Lost        A  3401
                                         main servo pumps   TFs
 -> 11:31                                were inoperative   [40600 ->
                                         for the first 30   40603] 15
                                         mins of this       RTS & 1
                                         support.           Priority
                                                            VCDUs

 031-13:11    63  DR# L2949     1        - Late 2-way mode  - Lost TF     A  3401
                                         change due to      [40616] 4
                                         previously         RTS VCDUs
                                         mentioned
                                         anomaly.

 031-17:37    63                1        - Unknown          - Lost TF     U  3401
                                                            [40657] 2
                                                            RTS VCDUs

                                         The s/c entered
                                         safing
                                         approximately 4
                                         hours after
                                         closest approach
                                         and the recovery
                                         was not completed
                                         until 2/10/99.

 042-08:06    43                1        - Unknown          - Lost TF     U  3412
                                                            [40807] 1
                                                            Priority
                                                            VCDU

 042-09:42    43  DR# A3408     1        - After TWNC was   - Lost TF     H  3412
                                         turned off the     [40814] 1
                                         FSR's did not      Priority
                                         recover.           VCDU

 042-10:50    63                2        - Unknown          - Lost        U  3412
                                                            TFs
 -> 11:31                                                   [40820 &
                                                            40821] 1
                                                            RTS & 1
                                                            Priority
                                                            VCDUs

 042-16:59    63                5        - The DGT tlm      - Lost      UPA  3412
                                         predicts were      TFs
 -> 20:10                                incorrect and the  [40846,
                                         station had to     40853 &
                                         make manual        40854,
                                         changes in order   40859 &
                                         to lock tlm        40860] 15
                                         during the stated  PB & 2
                                         time period.       Priority
                                                            VCDUs

 043-14:31    63                4        - The FCDs were    - Lost        U  3413
                                         unable to          TFs
 -> 14:59                                successful decode  [41072 ->
                                         at the             41075] 15
                                         Reed-Solomon       PB & 1
                                         level the four     Priority
                                         mentioned TFs -    VCDUs
                                         reason unknown.

 043-16:35    63                1        - Unknown          - Lost TF     U  3413
                                                            [41090] 4
                                                            PB VCDUs

 043-19:12    14                1        - The station was  - Lost TF     U  3414
                                         late in locking    [41115] 1
                                         the d/l signal     Priority
                                         after the 1-way    VCDUs
                                         mode change.

 044-17:06    14                1        - Rate change      - Lost TF     S  3415
                                         20-32bps           [41372] 2
 -> 17:15                                                   PB & 1
                                                            Priority
                                                            VCDUs

 044-23:21    14                3        - Unknown, The     - Lost        U  3415
                                         FCD was unable to  TFs
 -> 23:35                                successfully       [41445 &
                                         decode these TFs   41446,
 01:20                                   at the             41469] 11
                                         Reed-Solomon       PB & 1
                                         level.             Priority
                                                            VCDUs

 045-16:20    63                1        - Unknown, The     - Lost TF     U  3415
                                         FCD was unable to  [41569] 3
                                         successfully       PB & 1
                                         decode this TF at  Priorty
                                         the Reed-Solomon   VCDUs
                                         level.

 045-18:03    63                2        - Rate change      - Lost        S  3415
                                         40-32bps           TFs
 19:32                                                      [41584 &
                                         - Rate change      41594] 8
                                         32-20bps           PB VCDUs

 Time (GMT)  DSS  Reference    RT  Rcvd  Events             Comments  Cause  Pass
                              TFs                                            #
                             Lost  from

                                    PPT

 045-23:14    14                1        - Rate change      - Lost TF     S  3416
                                         60-40bps           [41641] 4
                                                            PB VCDUs

 046-09:45    63                2        - Rate change      - Lost        S  3416
                                         20-32bps           TFs
 -> 10:11                                                   [41768 &
                                                            41769] 5
                                                            PB, 2
                                                            RTS, & 1
                                                            Priority
                                                            VCDUs

 046-11:02    63  DR# L3009     3        - The uplink       - Lost        U  3416
                                         sweep did not      TFs
 -> 13:28                                capture the s/c    [41776,
                                         receiver on the    41795 &
                                         first attempt.     41796] 10
                                         The second         PB & 1
                                         attempt was        Priority
                                         successful.        VCDUs

 046-12:43    63  DR# L3013    29        - The SNR's were   - Lost        U  3416
                                         occasionally       TFs
 -> 17:23                                below the          [41790 &
                                         threshold for      41791,
                                         successful         41799 &
                                         decoding during    41800,
                                         the stated times.  41802,
                                                            41813,
                                                            41821 ->
                                                            41830,
                                                            41832 ->
                                                            41846]
                                                            122 PB &
                                                            9
                                                            Priority
                                                            VCDUs

 047-09:25    43                1        - Rate change      - Lost TF     S  3417
                                         40-32bps           [42015] 4
                                                            PB VCDUs

 047-12:39    63                4        - The TFs were     - Lost        I  3417
                                         not on the TDS,    TFs
 -> 13:06                                but were           [42041 ->
                                         transmitted from   42044] 15
                                         the GTC.           RTS BTD &
                                                            1
                                                            Priority
                                                            VCDUs

 047-23:11    43                1        - Rate change      - Lost TF     S  3418
                                         60-40bps           [42142] 4
                                                            PB VCDUs

 047-23:25    43  DR# A3434   140        - The GTC-GIF      - Lost        U  3418
                                         failed and was     TFs
 ->                                      unable to          [42145 ->
 048/09:45                               restored--reason   42183]
                                         unknown.           542 PB &
                                                            18
                                                            Priority
                                                            VCDUs

 049-13:55    63                1        - The station was  - Lost TF     U  3419
                                         late in acquiring  [42644] 1
                                         the downlink       Priority
                                         signal.            VCDUs

 049-15:49    63  DR# L3026     4        - The station      - Lost       PD  3419
                                         sweep the s/c      TFs
 -> 18:07                                receiver with the  [42657 &
                                         incorrect tuning   42658,
                                         parameters.        42678 &
                                                            42679] 14
                                                            PB VCDUs

 TOTAL                        217     0

                                         Total Science      2023.5
                                         Frames:

                                         Total Frames       2494
                                         (including Fill):

PP - Procedural (Project) Transfer Frames #s lost in brackets [.........]

PD - Procedural (DSN)

H - H/W Related/Failure

A - Antenna Problem

S - S/W Related

UPA - Unscheduled project action

SPA - Scheduled Project activity

GCF- GCF hardware/software anomaly

F - Facility problem (e.g. power failure)

U - Unknown

W - Weather (e.g. Parkes stow due to high winds)

I - Internal JPL AMMOS anomaly

JN - Jupiter Hot Body Noise

SS - Solar Scintillation

SE - SPACECRAFT EMERGENCY
