Alignment Of New Brushes; Slip Rings; Machining Of Slip Rings; Replacement Of Slip Rings - Piper PA-32R-301 SARATOGA SP Maintenance Manual

PROPELLER DEICING SYTEM (Cont.)
F. REPAIR PROCEDURE FOR INDIVIDUAL COMPONENTS (Cont.)

(4) ALIGNMENT OF NEW BRUSHES

Anytime brush block assembly is dismounted, alignment at reinstallation must be checked as
described in 100 Hour Inspection, Step 7 and Figure 12.
G. SLIP RINGS

(1) MACHINING OF SLIP RINGS

Slip rings with roughened or damaged surfaces can be machined to restore serviceability. Remove
starter ring gear assembly from aircraft to mount it in a lathe, located concentrically in lathe and
with not over 0.002 wobble or run-out over 360 rotation with respect to mounting surface of
starter gear/slip ring assembly. Take light cut for smooth finish and cut no deeper than required to
remove surface damage. Contact surfaces of three slip rings must be parallel within 0.005 inch
and flat within 0.005 inch overall - deviation from flat not to exceed 0.002 inch over a 4 inch arc.
If necessary, undercut insulation between slip rings to a depth of .030 inch below contact surface
of slip rings. In this operation, width of slip ring must be reduced more than .005 inch. Contact
surface of slip rings must have a finish of 29-35 micro inches. De-burr slip ring edges and
reinstall on airplane.
If in machining, solder or braze connection on underside of
slip ring is exposed replacement of ring gear assembly will be
necessary.

(2) REPLACEMENT OF SLIP RINGS

Starter ring assemblies that are open or shorted electrically, cracked or damaged structurally, or
which have damaged surfaces beyond scope of minor repair to clean up, should be replaced with a
new starter ring assembly.
PIPER AIRCRAFT
PA-32R-301/301T
MAINTENANCE MANUAL
– NOTE –
THIS SPACE INTENTIONALLY LEFT BLANK
2I9
30-60-00
Page 30-39
Reissued: July 1, 1993