SGNSCSelf Generating Nitrogen Service Cart (US DoD)
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A variety of scenarios were defined to examine two factors of interest: SGNSC inventory levels and SGNSC reliability.
Failures requiring SGNSC were modeled using peacetime and surge flying schedules.
The primary data examined were SGNSC utilization, mission effectiveness, and time spent waiting for SGNSC assets to become available.
At an inventory of five SGNSC with a 50-hour MTBF, aircraft sorties did not suffer at all.
The failure rates of SGNSC were manipulated to determine the sensitivity of demand.
SGNSC was not very sensitive to changes in reliability as Figure 1 shows.
A comparison of confidence intervals by SGNSC MTBF in Table 6 shows that an inventory of five SGNSCs or more resulted in no statistical difference in wait time with 95 percent confidence.
SGNSC quantities of 5, 10, and 15 were used again to examine sensitivities.
The effect of varying reliability of the SGNSC carts was minor compared to varying the quantity of SGNSC.
The effect of changing to a fly-when-ready mode of operation exposed SGNSC to a much higher demand rate.
High utilization should not become a factor for SGNSC BOI as it comes with a high a cost to the maintainer.
MTBF effects are minimal, and it is postulated that a spare for the transient support is unnecessary, provided transient support may borrow an SGNSC from the home-station AGE shop.