ATTITUDE AND DIRECTION
GYRO HORIZON
Gyro horizon is essentially an air driven gyroscope rotating in a horizontal plane and is operated by same
principal as directional gyro. Due to gyroscopic inertia, spin axis continues to point in vertical direction,
providing a constant visual reference to attitude of airplane relative to pitch and roll axis. A bar across face
of indicator represents horizon and aligning miniature airplane to horizon bar simulates alighnent of airplane
to acutal horizon. Any deviation simulates deviation of airplane from true horizon. Gyro horizon is marked
for different degrees of bank.
CHART 4
TROUBLESHOOTING GYRO HORIZON INDICATOR
PIPER AIRCRAFT
PA-32R-301/301T
MAINTENANCE MANUAL
34-20-00
Page 34-9
Reissued: July 1, 1993
3E22
Trouble
Cause
Remedy
Bar fails to respond.
Insufficient vacuum.
Check pump and tubing.
Filter dirty.
Clean or replace filter.
Bar does not settle.
Insufficient vacuum.
Check line and pump.
Adjust valve.
Incorrect instrument.
Check part number.
Defective instrument.
Replace.
Bar oscillates or shimmies
Instrument loose in panel.
Tighten mounting screws.
continuously.
Vacuum too high.
Adjust valve.
Defective mechanism.
Replace instrument.
Instrument does not indicate
Instrument not level in
Loosen screws and level
level flight.
panel.instrument.
Aircraft out of trim.
Trim aircraft.
Bar high after 180° turn.
Normal, if it does not exceed
1/16 inch.
Instrument tumbles in flight.
Low vacuum.
Reset regulator.
Dirty filter.
Clean or replace filter.
Line to filter restricted.
Replace line.
Plug missing or loose in
Replace or tighten plug.
instrument.
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 ...