PROPELLER DEICING SYTEM
A. Description
Deicers contain special heater wires protected by fabric plies and by oil and abrasion-resistant rubber.
The side of deicer cemented to propeller has a dull finish whereas air side finish is glossy. Each deicer
has a separate lead for inboard and outboard heater and a third lead which is a common ground. These
leads are so marked. An unmarked ground can be identified by using an ohmmeter across three possible
pairs of leads. One pair will show twice the resistance of the other pairs. The latter are the hot leads
and the lead excluded from the pair that shows twice the resistance of the other pairs is the ground
lead. All deicers used on this airplane must be of the new design, which includes a grey plastic patch
where deicer and strap join.
To transfer electrical power to rotating deicers, a brush block assembly is mounted to engine or similar
stationary member and has brushes which are spring loaded to press against revolving slip rings. The
slip ring assembly is provided as a slip ring gear assembly which replaces original starter ring gear of
engine.
The timer is a sealed unit. If found inoperative, it must be replaced as an assembly no field repairs are
authorized.
The ammeter is designed for each particular system and it is therefore important that correct replacement
part number be used if replacement should be required. In event of low aircraft battery voltage (very
possible in ground checks), ammeter readings will be lower than at full voltage. Provided ammeter
needle reads in shaded range on scale, (full aircraft voltage) current flow is considered as normal.
B. Deicer System Operational Check
(1) Lock brakes and operate engine at near take-off power.
(2) Turn deicer system switch ON and observe deicer ammeter for at least two minutes.
(3) Ammeter needle must flicker approximately every 30 seconds as step switch of timer operates.
(4) With engines stopped, turn deicer switch ON and feel deicers on propellers for proper sequence of
heater operation.
(5) Temperature rise should be noticeable and each heater should warm for about 30 seconds.
(6) Local hots spots indicate surface damage requiring replacement of deicer.
C. Troubleshooting
Troubles along with their probable causes and suggested remedies are listed in Chart 4.
PIPER AIRCRAFT
PA-32R-301/301T
MAINTENANCE MANUAL
30-60-00
Page 30-27
Reissued: July 1, 1993
2H21
Summary of Contents for PA-32R-301T SARATOGA S
Page 26: ...CHAPTER 4 AIRWORTHINESS LIMITATIONS 1C1 ...
Page 29: ...CHAPTER 5 TIME LIMITS MAINTENANCE CHECKS 1C4 ...
Page 53: ...CHAPTER 6 DIMENSIONS AND AREAS 1D6 ...
Page 64: ...CHAPTER 7 LIFTING AND SHORING 1D21 ...
Page 68: ...CHAPTER 8 LEVELING AND WEIGHING 1E1 ...
Page 72: ...CHAPTER 9 TOWING AND TAXIING 1E5 ...
Page 76: ...CHAPTER 10 PARKING AND MOORING 1E9 ...
Page 80: ...CHAPTER 11 REQUIRED PLACARDS 1E13 ...
Page 92: ...CHAPTER 12 SERVICING 1F1 ...
Page 126: ...CHAPTER 20 STANDARD PRACTICES AIRFRAME 1G17 ...
Page 127: ...THIS PAGE INTENTIONALLY LEFT BLANK ...
Page 139: ...CHAPTER 21 ENVIRONMENTAL SYSTEMS 1H5 ...
Page 188: ...CHAPTER 22 AUTOFLIGHT 1J7 ...
Page 193: ...CHAPTER 23 COMMUNICATIONS 1J12 ...
Page 203: ...CHAPTER 24 ELECTRICAL POWER 1J22 ...
Page 263: ...CHAPTER 25 EQUIPMENT FURNISHINGS 2A13 ...
Page 269: ...CHAPTER 27 FLIGHT CONTROLS 2A20 ...
Page 332: ...CHAPTER 28 FUEL 2D11 ...
Page 363: ...CHAPTER 29 HYDRAULIC POWER 2E18 ...
Page 404: ...CHAPTER 30 ICE AND RAIN PROTECTION 2G16 ...
Page 470: ...CHAPTER 32 LANDING GEAR 3A13 ...
Page 550: ...CHAPTER 33 LIGHTS 3D24 ...
Page 562: ...CHAPTER 34 NAVIGATION AND PITOT STATIC 3E12 ...
Page 582: ...CHAPTER 35 OXYGEN 3F8 ...
Page 604: ...CHAPTER 37 VACUUM 3G6 ...
Page 616: ...CHAPTER 39 3G18 ELECTRIC ELECTRONIC PANELS MULTIPURPOSE PARTS ...
Page 620: ...CHAPTER 51 STRUCTURES 3G22 ...
Page 636: ...CHAPTER 52 DOORS 3H14 ...
Page 650: ...CHAPTER 55 STABILIZERS 3I4 ...
Page 662: ...CHAPTER 56 WINDOWS 3I16 ...
Page 670: ...CHAPTER 57 WINGS 3I24 ...
Page 688: ...CHAPTER 61 PROPELLER 3J18 ...
Page 704: ...CHAPTER 70 STANDARD PRACTICES ENGINES 3K10 ...
Page 708: ...CHAPTER 71 POWER PLANT 3K14 ...
Page 737: ...CHAPTER 73 ENGINE FUEL SYSTEM 4A13 ...
Page 749: ...CHAPTER 74 IGNITION 4B1 ...
Page 783: ...CHAPTER 77 ENGINE INDICATING 4C11 ...
Page 793: ...CHAPTER 78 EXHAUST 4C21 ...
Page 801: ...CHAPTER 79 OIL 4D5 ...
Page 805: ...CHAPTER 80 STARTING 4D9 ...
Page 819: ...CHAPTER 81 TURBINES 4D23 ...
Page 833: ...CHAPTER 91 CHARTS WIRING DIAGRAMS 4E13 ...