TM 1-1500-204-23-4 (a)  Starters  removed  from  aircraft.    Inspect the starter as follows: 1 Inspect    starter    for    dents    and cracks. 2 Inspect   starter   for   stripped   or damaged threads. 3 Inspect   drive   shaft   spline   for excessive wear. 4 Inspect  for  smooth  rotation  and axial/radial play of bearings. 5 Inspect  electric  starters  for  the following: · Starter  brushes  for  freedom  of movement in brush holders. · Brush    leads    for    deterioration and chaffing. · Brushes for wear. · Commutator    for    evidence    of arcing   and   presence   of   metal particles. 6 Inspect   air-turbine   starters   for the following: · Metal particles on drain plug. · Nozzle vanes that are broken. · Oil level. · Extemal oil leakage. 7 Inspect hydraulic starters tor the following: · Hydraulic fluid leakage. · Proper operation of accumulator. NOTE Consult    applicable    maintenance manual for specific allowable limits for starter brushes. (b) Starters installed on aircraft. Inspect the starter as follows: 1 Open engine cowling as required. 2 Inspect    all    parts    for    obvious signs  of  wear,  cracks,  distortion,  corrosion,  and  other damage. 3 Inspect   commutator   for   arcing and wear, using a mirror and bright light. 4 Inspect brush retainers for breaks and unseated condition, using a mirror and bright light. 5 Inspect brush heads for condition, using a mirror and bright light. 6 Inspect   mounting   location   and torque. 7 Inspect for fluid leakage. 8 Close cowling. (3) Replacement criteria. Starter replacement criteria are as follows: · Replace when any unusual bearing     or     gear     noises     are detected during operation. · Replace when commutator bars are rough, scored, pitted, loose, high,   or   worn   to   the   depth   of insulating mica between bars. · Replace brushes that are cracked, broken, chipped, unevenly  worn,  or  worn  beyond maximum wearing depth slot. · Replace when magnetic particles     on     drain     plug     are coarser    than    fuzzy,    such    as chips, slivers, etc. · Replace when there are intemal starter malfunctions. · Replace  when  seal  assemblies are leaking. Change 3  3-16