TASK 70-33-03-220-006
1 . General.
The inspection of fretting or galling on surfaces requires special techniques to determine serviceability. The nature of these defects(refer to definitions in TASK 70-30-00-200-001, Inspection Methods) makes the assessment of the damage difficult. Due to this difficulty, the following method may be used, when referenced by the Engine/Shop Manual for a specific part.
2 . Materials.
Subtask 70-33-03-220-061
 
Consumable Product
No.
 
A. Bright Boy Stick
with Holder
ST-90-ALO-801-R
C10-072  
 
B. Bright Boy Stick
with Holder
ST-180-ALO-801-R
C10-072  
3 . Procedure.
Subtask 70-33-03-220-062
A.Initial Inspection.
Visually determine the boundaries of the affected area and inspect as follows:
(1)Survey the entire affected area with a 0.03 inch (0.8 mm), radius scriber. Move the scriber in a random motion. Use feel, not sight, to determine if the affected area has a change in the surface when compared to the adjacent unaffected area resulting in increased roughness.
(2)If a change cannot be felt with the scribe, the area is serviceable; if a change can be felt, see paragraph B.
B.Cleanup of Area.
(1)Using an abrasive stick, rub the affected area briskly to remove any deposited material buildup. The abrasive stick is indicated in Subtask 70-33-03-220-061, Materials.
(2)Brush the area clean of any residue and see paragraph C.
C.Glass Inspection.
(1)Using a 3-7X glass and bright light, inspect the cleaned area for missing material.
NOTE:
Missing material is defined as displacement or missing surface material which results in depressions extending below original surface.
(2)If missing material is not evident the part is serviceable; if missing material is evident, see paragraph D.
D.Final Inspection.
(1)Using a 0.03 inch (0.8 mm) radius scriber, inspect the area (reference Subtask 70-33-03-220-061, Materials.).
(2)If a change cannot be felt, the part is serviceable. If a change is felt, the part is not serviceable. Refer to Engine/Shop Manual for part disposition.