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 % standing for 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 @60% LoC (Chi Square) or Probability of failure @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
Indicates the range of T° when T° has to be considered
POWER Indicates the range of Power when Power has to 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
WO Wear-Out is to be considered when “YES”
Table 7.4.8 Reliability data#
REF EQUIPEMENT FR (fit) / % POINT ESTIM. QUALITY MATURITY TECHNOLOGY COMPLEXITY ORBIT 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