2.  
Head aircraft on a magnetic North heading. Adjust N-S adjustment screw until compass reads exactly North.

3.  
Head aircraft on a magnetic East heading and do the same as Step 2, adjusting E-W adjusting screw.

4.  
Head aircraft on magnetic South heading and note resulting South error. Adjust N-S adjusting screw until one-half of this error has been compensated. No compensation adjustment shall be made with the combustion heater operating.

5.  
Head aircraft on magnetic West and do same as Step 4, adjusting E-W adjustment screw.

6.  
Head aircraft in successive magnetic 30 degree headings and record compass readings on appropriate deviation card. Deviations must not exceed + 10° on any heading. An additional deviation card will have to be made out for the combustion heater. This second deviation card shall be accomplished under the above conditions, except the combustion heater shall be operating.

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34-20-00 Page 34-17 Issued: April 1, 1997
TROUBLESHOOTING.
CHART 3404. TROUBLESHOOTING (MAGNETIC COMPASS)

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TURN COORDINATOR.
The airplane is equipped with a turn coordinator. This instrument consists of two components:
1.  
An electrically driven, captive gyro rotor which is slaved to the turn indicator. The spinning gyro resists change in position as the airplane maneuvers. This resistance is mechanically translated into indicator movement displaying both the rate of yaw and rate of roll. The indicator moves when the airplane rolls right or left, indicating rate (not degree) of roll. If the airplane is held at a constant angle of bank and the rudder is applied to maintain heading (i.e. - slipping), the indicator will return to neutral, indicating no roll or turn. If the airplane is established in a coordinated turn, the indicator will remain deflected, indicating rate of turn.

2.  
A metal ball sealed in a curved glass tube filled with dampening fluid provides a sensitive indication of yaw and is used to maintain coordinated flight. The ball rolls freely within the inclined glass tube display on lower instrument face. Any deflection from center indicates the presense of side forces on the aircraft.

TROUBLESHOOTING.
An obvious malfunction of either turn coordinator component requires repair by an FAA approved instrument repair facility, or replacement. Service is restricted to the instrument installation and electric power connection.
1.
Ensure proper voltage is available.

2.
Ensure electrical grounding is intact.

3.
Ensure circuit breaker is functional.

4.
Ensure all electrical plugs and connections are secure.

5.
Level airplane. Level instrument.

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C H A P T E R

VA C U U M

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CHAPTER 37 - VACUUM
TABLE OF CONTENTS / EFFECTIVITY

CHAPTER/ GRID SECTION SUBJECT NO. EFFECTIVITY
37-00-00 GENERAL 2L6
Description and Operation 2L6 Vacuum System Service Tips 2L6 Troubleshooting 2L10
37-10-00 DISTRIBUTION 2L13
Vacuum Regulator Valve 2L13 Adjustment 2L13 Removal and Replacement 2L13 Vacuum Pump 2L13 Removal and Installation 2L13
37-20-00 INDICATING 2L15
Vacuum Gauge 2L15 Removal and Installation 2L15
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37-00-00 Page 37-5 Issued: April 1, 1997
GENERAL.
Maintenance, other than described in this chapter shall be done by the instrument manufacturer or an authorized repair station.
DESCRIPTION AND OPERATION.
The vacuum system employed to operate the gyro instruments is comprised of two engine driven dry vacuum pumps, two vacuum regulator valves containing filters, a check valve and the necessary tubing on each engine. A vacuum gauge is used to constantly monitor the system. If vacuum is lost from either vacuum pump or from any other malfunction, the check valve automatically closes and vacuum is supplied by one pump. In this case one of the two red malfunction buttons appears on the face of the gauge, indicating that vacuum is not available from that side. An air filter is incorporated in the system to increase the life of the gyros. The filter is mounted behind the instrument panel in the upper left-hand corner and should be replaced at each 100 hours of operation. The instruments in this system are face mounted located on the instrument panel.
— WARNING — THE USER IS RESPONSIBLE FOR REFERRING TO THE APPLICABLE VENDOR PUBLICATION(S) WHEN SERVICING OR INSPECTING VENDOR EQUIPMENT INSTALLED IN PIPER AIRCRAFT. (SEE INTRODUCTION, PAGE 5.)
　
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