MD Helicopters CSP-900RMM-2, Servicing And Maintenance

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CSP − 900RMM − 2 MD Helicopters, Inc.
Rotorcraft Maintenance Manual
Page 601/(602 blank)
Revision 18
63-30-00
MAIN ROTOR STATIC MAST
INSPECTION
1. Main Rotor Static Mast
A. Main Rotor Static Mast Inspection
(Ref. Figure 601)
(1). Inspect static mast for nicks, dents and
scratches. No damage allowed.
(2). Inspect swashplate slider bearing
journal on static mast for wear.
No damage allowed.
(3). Inspect for worn or missing paint.
Reference Main Rotor Static Mast
Support-Base Assembly Paint Repair
63-30-00.
(4). Inspect internal static mast for paint
chips. Reference Main Rotor Static
Mast Support-Base Assembly Paint
Repair 63-30-00.
NOTE:
The Outer Dimension (OD) areas for
corrosion inspection are the:
lower angled area.
open area below the lower bearing boss.
critical area of 0.125 inch (3.175 mm) just
below the lower bearing boss.
(5). Check for corrosion that does not
penetrate to the base material. The
corrosion will be white in color.
(a). If corrosion is found, reference
63-30-00 Main Rotor Static Mast
White-Corrosion Repair.
(6). Check for corrosion that penetrates to
the base material (red or dark brown in
color) in the areas that follow:
(a). Check for corrosion in the open area
less than 0.125 inch (3.175 mm)
below the lower bearing boss and
away from from the boss radius.
None allowed. No repair allowed.
(b). Maximum repairable depth is
0.005 inch (0.127 mm) in the remain­
ing inspection areas. Reference
63-30-00 Main Rotor Static Mast
Base-Material Corrosion Repair.
NOTE:
The areas for corrosion Internal Dimen­
sion (ID) inspection is the top area of the
static mast.
(7). Inspect top area of inside of mast
(entire circumference) for evidence of
cracks or pitting using bright light and
10x magnification.
No cracks allowed. If cracks are
found remove static mast from
service.
If pitting is found go to Main Rotor
Static Mast Inside Dimension (ID)
Pitting Repair for possible repair.
CORROSION
INSPECTION AREAS
LOWER BEARING
BOSS
CRITICAL AREA
0.125 (3.175mm)
BELOW BEARING
BOSS
INTERNAL AREA
INSPECTION
9B63-037A
Figure 601. Static Mast
B. Mixer Pivot Support Inspection
(1). Inspect mixer pivot support for cracks
and corrosion. No damage allowed.
(2). Inspect bearing for binding, catching,
corrosion, metal chips and other
damagme. No damage allowed.