TM  55-1615-226-40 (8)  Score  marks  on  the  inside  surface  of holes and bushings must not exceed 0.002 inch. 2-19. Hub And Collective Sleeve. 2-20. Inspect hub and collective sleeve as follows: a. Perform  nondestructive  inspection  of  hub  in accordance  with  table  2-1. b. Inspect  hub  bolt  hole  ID  for  wear.  Wear  limit shall  not  exceed  0.5015  inch. c. Inspect  hub-bearing  bore  ID  for  wear.  Wear limit  shall  not  exceed  5.2520  inches. d. Inspect  hub  for  mechanical  or  corrosion damage. (1)  Mechanical  or  corrosion  damage  to thread inside hub. (2)  Mechanical  damage  shall  not  exceed 0.010 inch in depth on the flat surfaces at the end of scissors  attachment  lugs  and  the  surrounding surfaces within 0.60 inch of these ends (3)  Mechanical  damage  shall  not  exceed 0.010 inch in depth on the 0.4995-inch bore surface (4)  Corrosion  damage  shall  not  exceed 0.005 inch in depth on the flat surfaces at the end of the  scissors  attachment  lugs  on  the  surrounding surfaces within 0.60 inch of these ends (5)  Corrosion  damage  shall  not  exceed 0.005  inch  in  depth  on  the  0.4995-inch  bore  surface. (6)  Mechanical  damage  shall  not  exceed 0.035 inch in depth in all areas of hub other than specified  in  (1)  (2),  and  (3)  above. (7)  Corrosion  damage  shall  not  exceed 0.017 inch in depth. (8) Damage in any one area shall not exceed 0.25 square inch in area or 0.75 inch in any one length. (9) Mechanical damage to surfaces sur- rounding a hole, within a distance of 1.5 times the radius of that hole shall not exceed 0.010 inch in depth. (10)  Corrosion  damage  to  surfaces  sur- rounding  a  hole  within  1.5  times  radius  of  that  hole shall  not  exceed  0.005  inch  in  depth. (11) Inspect hub bolt hole for scoring. Score marks inside the bolt hole shall not exceed 0.002 inch. e. Perform  nondestructive  inspection  of  collec- tive sleeve, in accordance with table 2-1. f. Inspect sleeve bearing seat for wear. OD of bearing seat shall not be less than 4.2480 inches g. Inspect  sleeve  for  damage  to  the  4-1/4-16 UN-2A  threads  at  upper  end  of  sleeve h. Inspect  sleeve  for  damage  to  10-32  NF3B threads of the eight bolt holes at the base of the sleeve i. Inspect  sleeve  for  mechanical  or  corrosion damage. (1)  Mechanical  damage  shall  not  exceed 0.01-inch  depth  to  the  flat  surfaces  surrounding  the 1.500 inch diameter holes and the inside and outside of the 4.080-inch OD cylindrical surfaces (2)  Corrosion  damage  shall  not  exceed 0.005 inch in depth to the flat surfaces surrounding the  1.50-inch  diameter  holes  and  the  inside  and outaide of the 4.080-inch OD cylindrical surfaces (3)  Mechanical  damage  shall  not  exceed 0.035 inch in depth in all areas at the sleeve other than specified in (1) above (4)  Corrosion  damage  shall  not  exceed 0.017 inch in depth in all areas of the sleeve other than  specified  in  (2)  above. j. Visually inspect flange (32, figure 2-1) for wear or damage. k. Inspect  plate  set  (33),  using  nondestructive teat as outlined in table 2-1. Inspect teeth of splnie for damage. l. Visually inspect lock plate (35) for wear or damage. m. Inspect nut (36) using nondestructive test in accordance with table 2-1. Inspect threads for damage. n. Visually inspect spacer ring (39) for Wear or  damage,  warpage,  pitting,  scratches  corrosion and  cracks. o. Inspect pin (40) for wear or damage. p. Inspect nut (41) using nondestructive test in accordance with table 2-1. Inspect threads for damage. q. Inspect  bearing  set  (42)  for  damaged  seals  or shields  smoothness  and  freedom  of  operation,  and excessive   looseness. NOTE Check bearings   for smoothness  of  operation prior  to  disassembly  of sleeve  assembly.  Visually inspect  bail  bearings  and races   on   bench   under strong  light. 2-6 Change 2