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61-20-00 Page 61-10 Issued: April 1, 1997
3F10
F.  After completion of the high rpm adjustment, adjust the control system so that the governor control arm will contact the high rpm stop. The cockpit control lever should be .031 to .062 of an inch from its full forward stop.  To adjust the control travel, disconnect the control cable end from the control arm. Loosen the cable jam nut and rotate the end to obtain the desired level clearance. Connect the cable end and tighten jam nut.
G.  It is only necessary to adjust the governor control system high rpm setting. This action automatically satisfies the positive high pitch setting.
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61-20-00 Page 61-11 Issued: April 1, 1997
PROPELLER UNFEATHERING SYSTEM.
The optional propeller unfeathering system provides a means for storing air and oil pressure in an accumulator so that the propeller may be moved out of the feathered position when so desired.  Refer to the Pilot’s Operating Handbook for proper operating procedures.
ACCUMULATOR SERVICE.
— WARNING —
WHEN REMOVING THE UNIT FROM THE AIRPLANE, COMPLETELY DISCHARGE ALL NITROGEN PRESSURE BEFORE DISCONNECTING THE OIL LINE.
This is a free piston type accumulator that is charged with nitrogen to a working pressure of 90 to 100 psig at normal room temperature. Accumulator overhaul should coincide with governor overhaul.  Refer to McCauley — Service Manual No. 780401 for detailed instructions.
General servicing of the accumulator during its use between overhauls consists of periodically checking the nitrogen charge and visually inspecting the unit for any oil leaks.  Refer to the Pilot’s Operating Handbook for proper operational check procedure.
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61-20-00 Page 61-12 Issued: April 1, 1997
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Figure 61-4. Propeller Unfeathering System. 
3F13  61-20-00 Page 61-13 Issued: April 1, 1997 

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61-20-00 Page 61-14 Issued: April 1, 1997
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CHAPTER
71

POWER PLANT
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CHAPTER 71 - POWER PLANT 
TABLE OF CONTENTS / EFFECTIVITY 
CHAPTER/ SECTION  SUBJECT  GRID NO.  EFFECTIVITY 
71-00-00  GENERAL  3F19 
Description Troubleshooting Removal of Engine Installation of Engine Engine Pre-oiling  3F19 3F19 3G1 3G4 3G4 
71-10-00  COWLING  3G6 
Removal and Installation Cleaning, Inspection and Repair  3G6 3G6 
Engine Cowl Flaps Operation and Adjustment  3G6 3G6 
71-20-00  MOUNTS  3G9 
Engine Shock Mounts Installation  3G9 3G9 
71-60-00  AIR INTAKES  3G12 
Induction System Removal and Installation of Air Filter Housing Inspection, Removal, and Installation of Carburetor Air Box Removal and Installation of Carburetor Heat Shroud  3G12 3G12 3G12 3G12 

71-Cont./Effec. Page 71-3 Issued: April 1, 1997
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71-Cont./Effec. Page 71-4 Issued: April 1, 1997
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GENERAL.
This chapter covers the power plants used in this airplane, and is comprised of instructions for removal and installation, minor repairs, and service.
DESCRIPTION.
O-360-A1H6 (left) and LO-360-A1H6 (right) Textron Lycoming four cylinder, horizontally opposed, engines rated at 180 horsepower each are installed. See Chapter 6, Leading Particulars, for engine operating limits.
— CAUTION —
TO ENSURE ADEQUATE OUTFLOW THROUGH OIL BREATHER TUBE ON -AIH6 ENGINES, DO NOT PERMIT CUTOUT IN SHROUD AROUND BREATHER VENT HOLES TO BECOME BLOCKED.
The -A1H6 model engines have the oil breather pipe wrapped in a sheath to decrease the probability of condensation freezing and blocking the pipe during winter operations. (Refer to Figure 71-1.)
The propellers installed are Hartzell constant speed units. (Refer to Chapter 61 for complete detail and service information.) The induction system on these engines consists of Marvel-Schebler HA-6 float type carburetors with dry type air filters.
The magnetos are Slick 4300 Series. These are installed two per engine as left and right magnetos with individual drives.  The left magneto on each engine incorporates an impulse coupling to provide ignition at engine cranking speed. (Refer to Chapter 74 for detailed information.)
TROUBLESHOOTING.
Potential power plant problems are listed in Chart 7101, which includes Probable Causes and Suggested Remedies.
— WARNING —
GROUND THE MAGNETO PRIMARY CIRCUIT BEFORE PERFORMING ANY CHECKS ON THE ENGINES.
71-00-00 Page 71-5 Issued: April 1, 1997
CHART 7101.  TROUBLESHOOTING (ENGINE)

TROUBLE  CAUSE  REMEDY 
　
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