MD Helicopters MD Explorer - Page 1663

CSP−900RMM−2MD Helicopters, Inc.
Rotorcraft Maintenance Manual
Page 607
Revision 36
64-30-01
Table 603. Fan Hub Damage Limits (Ref. Figure 603)
Examine
Maximum
Serviceable Limits
Maximum
Repairable Limits
Repair Procedure
Area A:
Fan hub outboard blade
contact surface for
scratches, nicks, and
missing material.
 Maximum damage
permitted 0.010 inch
(0.25 mm) in depth or
0.005 inch
2
(3.23
mm
2
) in area.
 Minimum distance
between damage 1.00
inch (25.4 mm).
 Maximum material
removal, 0.010 inch
(0.25 mm).
 Make damage smooth,
use a file and then
240−grit abrasive cloth
(C810) (or finer).
 Remove sharp edges
and surface defects.
 Touch up surface finish
with alodine (C241) and
primer (C308).
Area B:
Fan hub outboard flange
for scratches, nicks, and
missing material.
 Maximum damage
permitted 0.010 inch
(0.25 mm) in depth or
0.010 inch
2
(6.45
mm
2
) in area.
 Minimum distance
between damage 0.50
inch (12.7 mm).
 No more than three
locations of damage
permitted in each
square inch.
 Maximum material
removal, 0.010 inch
(0.25 mm).
 Make damage smooth,
with 240−grit abrasive
cloth (C810) (or finer).
 Remove surface
defects or sharp edges.
 Touch up surface finish
with alodine (C241) and
primer (C308).
Area C:
Fan hub flange for
scratches, nicks, and
missing material.
 Maximum damage
permitted 0.050 inch
(1.27 mm) in depth.
 No more than three
locations of damage
permitted in each
square inch.
 Maximum material
removal, 0.050 inch
(1.27 mm).
 Make damage smooth,
use 240 grit abrasive
cloth (C810) (or finer).
 Remove surface
defects or sharp edges.
 Touch up surface finish
with alodine (C241) and
primer (C308).
Other areas:
Fan hub for scratches,
nicks, and missing
material.
 Maximum damage
permitted 0.020 inch
(0.51 mm) in depth or
0.015 inch
2
(9.68
mm
2
) in area.
 Minimum distance
between damage 0.50
inch (12.7 mm).
 No more than three
locations of damage
permitted in each
square inch.
 Maximum material
removal, 0.020 inch
(0.51 mm).
 Make damage smooth,
use 240 grit abrasive
cloth (C810) (or finer).
 Remove surface
defects or sharp edges.
 Touch up surface finish
with alodine (C241) and
primer (C308).