PROPELLER DEICING SYTEM (Cont.)
D USING THE AMMETER
Whether in flight or during ground testing, the ammeter can be used to indicate the general nature of
most electrical problems. The troubleshooting chart is primarily based on this use of the ammeter and
assumes that the user does understand all normal operating modes of the system as given in Principles
of Operation.
– NOTE –
When troubleshooting, first use the ammeter test and heat test
to determine which circuits are involved. Use circuit diagram
for assistance to check voltages or continuity.
(1) If ammeter reading drops to one-half normal current for two-bladed or one-third normal current
for three-bladed propeller, this indicates that one heater circuit is open or possibly improper con-
nec- tions are allowing both inboard and outboard units to heat at the same time.
(2) Excess current reading on ammeter always indicates a power lead is shorted to ground. Thus,
when trouble of this nature is found, it is vital that grounded power lead be located and corrected.
(3) A considerable number of timers that have been returned for repair proved to be fully workable
when tested. Accomplish test described in Timer Test at end of this chapter before concluding that
timer is defective.
E INSPECTION
(1) 50 HOUR INSPECTION
(a) Lock brakes and operate engine at near take-off power. Turn deicer system switch ON and
observe deicer ammeter for at least two minutes. Ammeter needle must rest within shaded
band except for a flicker, approximately every 70 seconds, as step switch of timer operates. If
not, refer to appropriate entry of troubleshooting chart.
(b)With engine stopped, turn deicer switch ON and feel deicers on propellers for proper sequence
of heater operation. Temperature rise should be noticeable and each heater should warm for
about 30 seconds. Local hot spots indicate surface damage requiring replacement of deicer.
(c) Remove spinner dome and open access doors as required. With assistant obeserving deicer
ammeter and with deicer switch ON, flex all accessible wiring - particularly in deicer lead
straps, leads from slip ring assembly and fire wall electrical connectors and their wiring. Any
movement of ammeter needle other than the 90-second flicker of cycling indicates a short or
open that must be located and corrected.
PIPER AIRCRAFT
PA-32R-301/301T
MAINTENANCE MANUAL
30-60-00
Page 30-34
Reissued: July 1, 1993
2I4
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 ...