Downloaded from https://www.everyspec.com MIL-STD-3001-4(AS) Table 1. Probable Causes of and Corrective Action for Reported / Confirmed Defects REPORTED / CONFIRMED DEFECTS PROBABLE CAUSE CORRECTIVE ACTION 1. LP compressor, foreign object damage (FOD) / native object damage (NOD) a. FOD: ingestion of harmful material (stones, gravel, birds, etc.) into engine b. NOD: broken engine components (blade, disk, nut, bolt, bearing failure, etc.) Perform maintenance tasks in table 2 as required to correct defect 2. HP compressor FOD / NOD (rotor replacement not required) a. FOD: ingestion of harmful material (stones, gravel, birds, etc.) into engine b. NOD:
broken engine components (blade, disk, nut, bolt, bearing failure, etc.) Perform maintenance tasks in table 2 as required to correct defect 3. HP compressor FOD / NOD (rotor replacement required) a. FOD: ingestion of harmful material (stones, gravel, birds, etc.) into engine b. NOD: broken engine components (blade, disk, nut, bolt, bearing failure, etc.) Perform maintenance tasks in table 2 as required to correct defect 4. HP / LP turbine NOD Broken engine components (blade, disk, nut, bolt, bearing failure, etc.) Perform maintenance tasks in table 2 as required to correct defect 5. Engine overtemperature a. Hot stagnated engine start on the ground or in the air b.
Unscheduled overfueling during flight or ground running Perform maintenance tasks in table 2 as required to correct defect FIGURE 5. Example of a probable cause / corrective action table. 34