Fault Management
Network application protocols should make it possible to fault isolate to a single link. However most modern application protocols simply report that a fault occurred, but not the actual cause of the fault. Failure analysis must address possible causes, and strive to design them out. Persisting causes require maintenance actions.
Failure to establish a standardized fault management concept of operations across the entire weapons system for all fiber-optic links and interfacing sub-systems results in unintegrated repair processes applied to the aircraft fiber optics, leading to extended down time for troubleshooting and repair.
Fault Tree Analysis is needed to create the Logistics Support Analysis (LSA). The LSA collects and analyzes all of the Integrated Logistics Support (ILS) data involved with supporting the fiber optic network from conceptual design, through design and development, operation, and ultimately phase-out and disposal. The Level of Repair Analysis (LORA) and LSA then drives the maintenance plan which in-turn drives the avionics technician skills, skill level and training curriculum. Lack of accurate Fault Tree Analyses serves to decrease Operational Availability (Ao) and increase life cycle costs.
Maintenance Capabilities and Support
As was mentioned previously, splicing of broken fiber optic cables is not proven at the fleet organizational (“O”) level. And fiber optic cable termination is not proven at the fleet intermediate (“I”) level. Cable repair solutions based on depot supply of pre-terminated fiber optic cable segments are less cost-effective. Until on-aircraft “O”-level splicing and/or “I”-level termination is available in the fleet, aircraft maintenance costs will likely be higher.
Labeling
Labeling fiber optic capable WRAs and aircraft cable harnesses is expected to help reduce life cycle costs by giving the fleet maintainer clear warning of the presence of fiber optic technology onboard the aircraft. NAVAIR has developed a sticker for application on WRAs, Line Replaceable Modules (LRMs) and Line Replaceable Units (LRUs) as shown in Figure 15. It is desirable to locate the sticker in close proximity to the actual WRA connector that contains the fiber optic termini.
Fault Management
Network application protocols should make it possible to fault isolate to a single link. However most modern application protocols simply report that a fault occurred, but not the actual cause of the fault. Failure analysis must address possible causes, and strive to design them out. Persisting causes require maintenance actions.
Failure to establish a standardized fault management concept of operations across the entire weapons system for all fiber-optic links and interfacing sub-systems results in unintegrated repair processes applied to the aircraft fiber optics, leading to extended down time for troubleshooting and repair.
Fault Tree Analysis is needed to create the Logistics Support Analysis (LSA). The LSA collects and analyzes all of the Integrated Logistics Support (ILS) data involved with supporting the fiber optic network from conceptual design, through design and development, operation, and ultimately phase-out and disposal. The Level of Repair Analysis (LORA) and LSA then drives the maintenance plan which in-turn drives the avionics technician skills, skill level and training curriculum. Lack of accurate Fault Tree Analyses serves to decrease Operational Availability (Ao) and increase life cycle costs.
Maintenance Capabilities and Support
As was mentioned previously, splicing of broken fiber optic cables is not proven at the fleet organizational (“O”) level. And fiber optic cable termination is not proven at the fleet intermediate (“I”) level. Cable repair solutions based on depot supply of pre-terminated fiber optic cable segments are less cost-effective. Until on-aircraft “O”-level splicing and/or “I”-level termination is available in the fleet, aircraft maintenance costs will likely be higher.
Labeling
Labeling fiber optic capable WRAs and aircraft cable harnesses is expected to help reduce life cycle costs by giving the fleet maintainer clear warning of the presence of fiber optic technology onboard the aircraft. NAVAIR has developed a sticker for application on WRAs, Line Replaceable Modules (LRMs) and Line Replaceable Units (LRUs) as shown in Figure 15. It is desirable to locate the sticker in close proximity to the actual WRA connector that contains the fiber optic termini.
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