After the first 50 hour period and every 100 hours thereafter, the magneto ignition system should be checked.
If engine operating troubles develop which appear to be caused by the ignition system, it is advisable to check the
spark plugs and wiring first before working on the magneto. Should trouble appear definitely associated with the
magneto, the most effective measure is to install a replacement magneto which is known to be in satisfactory
condition and send the suspected unit to the overhaul shop for test and repair. Should this not be possible, a
visual inspection of the following items may disclose the source of trouble.
1.
Check the lead terminals for definite contact with spring contacts in outlets.
2.
Remove the harness outlet cover from the magneto and inspect for the presence of moisture and carbon
tracking due to moisture.
3.
Check contact springs in distributor block for evidence of spark erosion.
4.
5.
With the cover and harness separated from the magneto housing, check contact assemblies to see that cam
follower is securely riveted to its spring.
6.
Examine the contact points for excessive wear or burning. Figure 74-2 shows how the average contact point
will look when surfaces are separated for inspection.
— CAUTION —
DO NOT OPEN POINT CONTACTS MORE THAN .0625 OF AN INCH FOR
E X A M I N ATION OF CONTACT SURFACES EXCESSIVE SPREADING OF
THE BREAKER POINTS WILL OVERSTRESS AND DAMAGE THE
CONTACT SPRING.
Desired contact surfaces have a dull gray, sand-blasted (almost rough) or frosted appearance, over the area
where electrical contact is made. This means that points are worn in and mated to each other, thereby providing
the best possible electrical contact and highest efficiency of performance. Minor irregularities or roughness of
point surfaces are not harmful. (Refer to Figure 74-2, center.) Neither are small pits or mounds, if not too
pronounced. If there is a possibility of pit becoming deep enough to penetrate pad (refer to Figure 74-2. right),
reject contact assembly.
— Note —
No attempt should be made to stone or dress contact points. Should contact assembly
have bad points or show excessive wear, the complete contact assembly should be
replaced.
7.
Check condition of cam follower felts for proper lubrication. If oil has migrated from one follower felt to
another, it may be necessary to remove the lubrication from one felt strip while oiling another. If felt is
overlubricated, remove oil by using a clean, lintless cloth. If dry, apply one or two drops of Bendix Breaker
Felt Lubricant 10-86527.
PA - 4 4 - 1 8 0 / 1 8 0 T
AIRPLANE MAINTENANCE MANUAL
7 4 - 11 - 0 1
Page 74-03
Revised: May 15, 1989
3F20
PIPER AIRCRAFT
Summary of Contents for SEMINOLE PA-44-180
Page 38: ...CHAPTER DIMENSIONS AND AREAS 1B14...
Page 49: ...CHAPTER LIFTING AND SHORING 1C1...
Page 53: ...CHAPTER LEVELING AND WEIGHING 1C5...
Page 58: ...CHAPTER TOWING AND TAXIING 1C10...
Page 62: ...CHAPTER PARKING AND MOORING 1C14...
Page 65: ...CHAPTER REQUIRED PLACARDS 1C17...
Page 70: ...CHAPTER SERVICING 1C22...
Page 98: ...CHAPTER STANDARD PRACTICES AIRFRAME 1E2...
Page 108: ...CHAPTER ENVIRONMENTAL SYSTEM 1E12...
Page 189: ...CHAPTER AUTOFLIGHT 1H21...
Page 192: ...CHAPTER COMMUNICATIONS 1H24...
Page 202: ...CHAPTER ELECTRICAL POWER 1I10...
Page 228: ...CHAPTER EQUIPMENT FURNISHINGS 1J12...
Page 233: ...CHAPTER FIRE PROTECTION 1J17...
Page 238: ...CHAPTER FLIGHT CONTROLS 1J24...
Page 304: ...2A18 CHAPTER FUEL...
Page 325: ...2B17 CHAPTER HYDRAULIC POWER...
Page 357: ...2D1 CHAPTER ICE AND RAIN PROTECTION...
Page 414: ...CHAPTER LANDING GEAR 2F13...
Page 479: ...2I6 CHAPTER LIGHTS...
Page 488: ...2I16 CHAPTER NAVIGATION AND PITOT STATIC...
Page 503: ...2J7 CHAPTER OXYGEN...
Page 524: ...2K6 CHAPTER VACUUM...
Page 535: ...2K19 CHAPTER ELECTRICAL ELECTRONIC PANELS AND MULTIPURPOSE PARTS...
Page 546: ...INTENTIONALLY LEFT BLANK PA 44 180 180T AIRPLANE MAINTENANCE MANUAL 2L6 PIPER AIRCRAFT...
Page 547: ...2L7 CHAPTER STRUCTURES...
Page 582: ...CHAPTER DOORS 3A18...
Page 593: ...CHAPTER STABILIZERS 3B8...
Page 604: ...CHAPTER WINDOWS 3B22...
Page 611: ...CHAPTER WINGS 3C10...
Page 624: ...CHAPTER PROPELLER 3D1...
Page 643: ...CHAPTER POWER PLANT 3D21...
Page 667: ...CHAPTER ENGINE FUEL SYSTEM 3F1...
Page 681: ...CHAPTER IGNITION 3F16...
Page 712: ...CHAPTER ENGINE INDICATING 3H1...
Page 730: ...CHAPTER EXHAUST 3H19...
Page 734: ...CHAPTER OIL 3I1...
Page 743: ...CHAPTER STARTING 3I11...
Page 755: ...CHAPTER TURBINES 3J1...