Deicer Blades; Resistance Check Of Deicer Blade - Piper PA-32R-301 SARATOGA SP Maintenance Manual

PROPELLER DEICING SYTEM (Cont.)
G. SLIP RINGS (Cont.)
H. DEICER BLADES

(1) RESISTANCE CHECK OF DEICER BLADE

To determine incorrect resistance, short or open at brush-to-slip ring contact; disconnect harness
at timer and use low-range ohmmeter to read resistance from each deicer circuit lead (pins D and
F of harness plug) to ground. It should read 2.30 to 2.65 for two-bladed propellers or 1.55 to 1.78
for three-bladed propellers. If this reading is not obtained, disconnect the deicer lead straps to
measure heater resistance individually. Individual heater should be 4.58 to 5.26. If first check is
off limits but second check is satisfactory, trouble is probably in brush-to-slip ring area; if second
check is off limits, deicer is damaged and must be replaced.
(2) REPLACEMENT
If tests show blade deicer to have an open circuit, to be wrong resistance or to be visibly damaged
beyond repair as outlined in 100 Hour Inspection of this section, replace deicer.
PIPER AIRCRAFT
PA-32R-301/301T
MAINTENANCE MANUAL
Angle of Contact Brushes to Slip Rings
Figure 12
2I10
30-60-00
Page 30-40
Reissued: July 1, 1993