7.4.8. Reliability data for miscellaneous “standard model”

Table 7.4.8 provides the basic failures rates or basic probability of failure (%) to be considered for miscellaneous “standard models”.

The meaning of the columns is explained in Table 7.4.7.

Note 1 : MIS_01 TWTA, Single HPA

The failure rate is provided per TWT Channel (mono channel or dual channel). In order to be used for LEO, if adaptation is necessary, it is recommended to use:

1. By default the following proportion (based on average MIL-HDBK-217 [NR_MIS_1] reliability prediction) of the whole failure rate.

   • EPC_common = 36%

   • EPC_channel = 9%

   • CAMP = 25%

   • TWT = 30%

2. To use the supplier repartition as per its own reliability prediction.

Table 7.4.7 Structure of the reliability data table

Column	Description	Remark
REF	Identifies the miscellaneous item
EQUIPMENT	Name of the item
FR	Depending on the model, either a constant failure rate (fit) or a % standing for an estimate of the proportion of failures: A figure (integer) means a failure rate in fit, A proportion (figure followed by %) means a proportion of failure.	Constant failure rate at 60% LoC (Chi-square) or Probability of failure at 60% upper-bound one-sided interval
POINT ESTIMATE	When relevant — observed failure(s) — point estimate of the failure rate or of the proportion of failures %
QUALITY	Level of quality used to define the “standard model”	High, Medium, Low
MATURITY	Indicates the level of maturity, generally based on the first use of the equipment in-orbit
TECHNOLOGY	Indicates, when relevant, which technology is concerned
COMPLEXITY	Indicates, when relevant, the level of complexity
ORBIT	Indicates which orbit is relevant to the “standard model”	LEO, GEO
T°	Indicates the range of T° when T° should be considered
POWER	Indicates the range of Power when Power should be considered
CYCLING	Indicates the fact that cycling is a contributor to reliability
DUTY CYCLE	The percentage of time during which the item is operated
OTHER	Any other parameters or data to be considered
DEG	Degradation is to be considered when “YES”

Table 7.4.8 Reliability data

REF EQUIPEMENT FR (fit) / % POINT ESTIM. QUALITY MATURITY TECHNOLOGY COMPLEXITY ORBIT T° POWER CYCLING DUTY CYCLE OTHER WO STD_001 TWTA, Single HPA 200 n/a HIGH since 1990 HPA (TWTA) TWTA complexity GEO LEO 30° C < T° < 60°C ALL 30° C < T° < 60°C ON ON/OFF All frequencies C, X, Ku, Ka, L YES STD_002 TWTA, Dual HPA 400 n/a HIGH since 1990 HPA (TWTA) TWTA complexity GEO LEO 30° C < T° < 60°C ALL 30° C < T° < 60°C ON ON/OFF All frequencies C, X, Ku, Ka, L YES STD_003 BATTERY CELL (GEO) 5 2 HIGH since 2000 Li-Ion X S - Y P Z P- A S GEO 0°C < T°C < 20°C n/a n /a 100% DoD < 70% V < 50v YES STD_004 BATTERY CELL (LEO) 1 n/a HIGH since 2000 Li-Ion 18560 LEO 0°C < T°C < 20°C n/a 90mn 100% DoD < 70% CID, PTC YES STD_005 SOLAR ARRAY CELL Si 0,15 n/a HIGH since 1990 Si Triple-Junction GEO LEO -100°C < T° <100°C n/a n/a n/a n/a YES STD_006 SOLAR ARRAY CELL GaAs 0,15 n/a HIGH since 1991 GaAs Triple-Junction GEO LEO -100°C < T° <100°C n/a n/a n/a n/a YES STD_007 SADM GEO 210 150 HIGH since 1992 SlipRing n/a GEO -100°C < T° <100°C some kW n/a 100% n/a YES STD_008 SADM LEO 213 105 HIGH since 1992 SlipRing n/a LEO -100°C < T° <100°C some kW n/a 100% n/a YES STD_009 THRUSTER 82 71 HIGH since 1990 Cold gas Hot gas 1N – 10N GEO LEO n/a n/a ALL from low to high rate YES STD_010 TANK TUBING (SPF) 3,27% 2,4% HIGH since 2000 Ti Al PIPING GEO LEO n/a n/a n/a n/a MEOP up to 200bars NO STD_011 RW GEO 250 205 HIGH since 1990 bearing magnetic n/a GEO -30° C < T° < 80°C n/a n/a 100% REACTION MOMENUM YES STD_012 RW LEO 140 112 HIGH Since 1990 Bearing magnetic n/a LEO -30° C < T° < 80°C n/a n/a 100% REACTION MOMENTUM YES STD_013 DEPLOYMENT DEVICE Antenna 0,2% n/a HIGH since 1990 hinge n/a GEO LEO n/a n/a n/a one-shot no STD_014 DEPLOYMENT DEVICE Solar Array 0,3% n/a HIGH since 1990 hinge n/a GEO LEO n/a n/a n/a one-shot no