ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL
Rev.
6
MM-10-13
Apr
7/15
H.
Static
Balance
Procedure
– See Section 10-2.
NOTE:
Complete
the
static
balance procedure before installing the tail rotor on
helicopter.
I.
Pitch
Link
Inspection,
Repair, Assembly and Installation
NOTE: Pitch change links P/N 28-16345-11 or P/N 28-16391-1 must be installed as
same part number pairs (either two P/N 28-16345-11 or two P/N 28-16391-1).
Pitch change links P/N 28-16391-3 or P/N 28-16391-5 may be installed in
combination with each other but not in combination with P/N 28-16345-11 or P/N
28-16391-1. For the barrel type,
t
he pitch change link length and rod end
orientation has been set at the factory. Do not disassemble unless the rod ends
need replacement. If replacement is necessary, follow steps (3) through (6) (see
Figure 10-4).
(1)
Inspect the pitch change links for cracks, corrosion, bends, damage, and proper
and secure installation. Inspect the rod ends for excessive play.
(2) Corrosion, nicks, or scratches in the solid link, barrel, or rod end outer race not
exceeding 0.010 inch/0.25 mm deep may be burnished out. Replace the solid
link, barrel, or rod end if cracked or damage exceeds 0.010 inch/0.25 mm deep.
Replace the rod end if its axial play is exceeds 0.005 inch/0.13 mm.
NOTE:
Steps (3) through (6) and (10) apply to the barrel type pitch change links only.
(3)
Install lock nuts on rod ends.
(4)
Apply VC-3 Loctite to threads of rod ends.
(5) Turn right hand rod end into barrel until threads completely cover the witness
hole in the barrel.
(6) Turn left hand rod end into barrel until overall length of pitch link measures
4.260 inch ± 0.005 inch/10.82 cm ± 0.13 mm.
NOTE:
Replacing pitch links or rod ends requires checking T/R balance.
NOTE: Steps (7) through (12) are to be completed after installation of tail rotor on
transmission.
NOTE: For aircraft manufactured or modified with P/N 28-16391-3 or 28-16391-5 pitch
link assemblies, the rod end labeled “T/R
u
u
BLADE,
”
must be installed in the
proper orientation (Figure 10-2).
(7) Install the inboard hand thread rod end of the pitch change link and the spacers
(3) into the retainer. Install the bolts (1) so that heads are in the direction of
rotation, washers (2 & 5), and nuts (6). Torque the nuts and install the cotter
pins (Figure 10-2).
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