MD Helicopters MD Explorer - Main Rotor Balance (in Flight); Pitch Case Weight Adjustment (Recommended Location)

CSP−900RMM−2MD Helicopters, Inc.
Rotorcraft Maintenance Manual
Page 205
Revision 29
18-00-00
Section 95-30-00) to find necessary
adjustments to get correct balance.
(5). Make balance adjustments.
(6). Repeat steps (1). through (4). until
balance is 0.3 IPS or less.
H. Main Rotor Balance (In Flight)
Rotor Vibrations
(1). Start aircraft, refer to current Rotor
craft Flight Manual (Ref. Section
01-00-00, Table 201).
(2). Do the Collect M/R Data Run XX Menu
procedure (Ref. CSP-900RMM-3,
Section 95-30-00).
(3). Do the complete Balance Display
Measurement Menu procedure (Ref.
CSP-900RMM-3, Section 95-30-00).
Record results.
(4). Do the Main Rotor Solutions Options
Menu procedure (Ref. CSP-900RMM-3,
Section 95-30-00) to find necessary
adjustments to get correct balance.
(5). Make balance adjustments.
(6). Repeat steps (1). through (4). until
balance is 0.2 IPS or less.
I. Pitch Case Weight Adjustment
(Recommended Location)
(Ref. Figure 204)
Consumable Materials
(Ref. CSP−SPM)
Item Nomenclature
C229 Sealant, Conductive
C702 Lockwire
NOTE:
 Pitch case weight location is the recom
mended location for main rotor balance
adjustments.
 Hub weight location is an alternative
location and can be used along with the
pitch case location.
 Blade number one is located above nose of
helicopter when swashplate interrupter is
above azimuth sensor. Blades number 2,
3, 4, and 5 are numbered in sequence op
posite the direction the rotor turns.
(1). Find main rotor blade indicated by
Main Rotor Solutions Options Menu
procedure (Ref. CSP-900RMM-3,
Section 95-30-00)
NOTE: Balance weights are approximately
13.6 grams each. No more than 13 balance
weights (approximately 177 grams) can be
installed on each pitch case.
(2). Find the correct quantity of weight to
add or remove.
(3). Remove sealant from bolts (6), washers
(7), and bonding jumpers (8).
(4). Remove bolts (6), washers (7), bonding
jumpers (8), and weights (3) (if instaled).
(5). Prepare surface for electrical bond (Ref.
CSP-SPM).
NOTE:
 Change bolt length as necessary when
you add or remove weights.
 If weights were not installed before, you
must use a different part number bolt
when you install weights (Ref.
CSP-900IPL-4).
(6). Install balance weights, bonding
jumpers, washers, and bolts. Torque
bolts 20-25 in-lb (2.26-2.82 Nwm) and
safety with lockwire (C702).
(7). Test bolts for class “S” electrical bond
(Ref. CSP-SPM.
Sealant, Conductive (C229)
(8). Environmentally seal bolts, washers,
and bonding jumpers, use sealant
(C229) (Ref CSP-SPM).
WARNING