Deicer Wiring Harness Installation; Balancing; Deicer Final Electric Check; Deicer Final Functional Check - Piper PA-44-180 SEMINOLE Maintenance Manual

INSTALLATION OF DEICER WIRING HARNESS. (Refer to Figure 30-13.)
The propeller deice wiring harness is secured to the propeller counterweight as follows:
1. Insert the deicer wire harness thru the 9/32 diameter hole in the prop counterweight.
2. Connect the plugs of the prop deicers and the deicer wire harness as shown in Figure 30-13.
3. Install tie strap ( P/N MS 3367-1-9) between the leads along the length of the plugs. Do not tighten at this
time.
4. Install both tie straps (P/N MS 3367-2-9) under the tie strap installed in the previous step and around the
counterweight. Do not tighten at this time.
5. Install transflex tubing over deicer wire harness.
6. Route transflex tubing under both tie straps (P/N MS 3367-2-9) and tighten tie straps.
7. Tighten the tie strap around the plugs.
8. Install the terminals on the deicer wire harness.
9. Install the terminals of the harness to the screws on the spinner bulkhead and tighten the lead clip over the
harness.
ADJUSTMENTS AND TESTING.

BALANCING.

To assure balance of the propeller assembly, the original balancing weights or their equivalents must be
reinstalled. The weights must be left in the original position on the propeller hub. The restrainer and weights
should not interfere with any part of the propeller assembly under any condition. If for any reason balance
weights were removed, reinstall safety wire on screws. The deicer wire harness must be installed on the propeller
as just described.
FINAL ELECTRIC CHECK.
1. Make certain that all terminals are tight. Do not over torque.
2. Check the electrical resistance between the deicer terminals or between the slip rings. The reading should
be per Chart 3007.
FUNCTIONAL CHECK.
1. Start both engines and operate at 2300 RPM. Place the propeller deice switch in the ON position.
2. The ammeter should show a surge of current to one propeller followed by a surge of current to the opposite
p r o p e l l e r. Time between surges must not exceed 90 seconds. During current surges ammeter should
indicate within green arc.
3. Return propeller deice switch to the OFF position and shut-down engines.
Do not operate propeller deice equipment with engines not operating.
PIPER AIRCRAFT
PA - 4 4 - 1 8 0 / 1 8 0 T
AIRPLANE MAINTENANCE MANUAL
— Note —
2E24
3 0 - 6 9 - 0 2
Page 30-44
Revised: May 15, 1989