MIL-STD-1798 Mechanical Equipment And Subsystems Integrity ProgramThe purpose of this standard is to describe the general process to achieve and maintain the physical and functional integrity of the mechanical elements of aircraft systems. The goal of this integrity program is to achieve the desired level of safety and aircraft availability at the most economic cost across the life cycle of the weapon system. This standard allows the process to be tailored in a competitive environment to meet specific equipment, subsystem, and/or system requirements. The Mechanical Equipment and Subsystems Integrity Program MECSIP is implemented in the planning process and continued until retirement of the system.

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MIL-STD-1798C

3.15  Economic Impact (Major versus Minor).

The Procuring Authority defines what constitutes "major" versus "minor" economic impact for their program.

3.16  Fault detection.

Fault detection is a process which discovers the existence of faults.

3.17  Fault injection.

Fault injection is the process of analyzing and testing a system by intentionally injecting errors into the system or its components to:  (1) verify that it responds to the error(s) as expected and; (2) identify undesirable behavior that may be present in the design when encountering the error(s).

3.18  Fault isolation.

Fault isolation is identification of the fault in a unit under test to the specified fault resolution level of the item. Automatic or manual means can be utilized to achieve the specified fault resolution level.

3.19  Flammable vapor zone.

A flammable vapor zone is a fire protection zone on the aircraft where flammable fluid/vapor is routinely present, such as inside fuel tanks.

3.20  Flammable fluid leakage zone.

A flammable fluid leakage zone is a fire protection zone on the aircraft where a single failure

(such as a fuel leak) will introduce the presence of flammable fluid/vapor.

3.21  Flying qualities.

The flying qualities of an air vehicle are defined as the stability and control characteristics that have an important bearing on the safety of flight and on the pilots' impressions of the ease of flying the air vehicle in steady flight and in maneuvers.

3.22  Level I flying qualities.

a.   Satisfactory - Flying qualities clearly adequate for the mission Flight Phase. Desired performance is achievable with no more than minimal pilot compensation.

b.   Performance Achievable

c.   Minimal Pilot Workload (See MIL-STD-1797.)

3.23  Level II flying qualities.

a.   Acceptable - Flying qualities adequate to accomplish the mission Flight Phase, but some increase in pilot workload or degradation in mission effectiveness, or both, exists.

b.   Degradation in Performance and/or

c.   Increase in Pilot Workload (See MIL-STD-1797.)

3.24  Fracture-critical part.

A fracture-critical part is a safety-critical component that is not single load path nor sized by durability or damage tolerance requirements but requires special emphasis due to the criticality of the component. Fracture-critical parts generally call for special fatigue/fracture toughness

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