Introduction Page 20 Issued: April 1, 1997
4A24

CHAPTER
91

CHARTS
AND
WIRING DIAGRAMS

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CHAPTER 91 - CHARTS AND WIRING DIAGRAMS 
TABLE OF CONTENTS / EFFECTIVITY 
CHAPTER/ SECTION  SUBJECT  GRID NO.  EFFECTIVITY 
91-00-00  GENERAL  4B5 
Torque Requirements Decimal Conversions Decimal/Millimeter Equivalents of Drill Sizes Tire Balancer Building Instructions List of Consumable Materials Metric Conversion Tables  4B5 4B8 4B9 4B10 4B11 4B16  1R0202 
91-10-00  SPECIAL TOOLS  4B21 
Control Surface Balancing Too1 Fabricated Aileron Bellcrank Rigging Tool Fabricated Aileron and Flap Rigging Tool Fabricated Stabilator Rigging Tool Fabricated Rudder Rigging Tool  4B21 4B22 4B23 4B24 4B24  1R0202 1R0202 
91-20-00  ELECTRICAL SCHEMATICS  4C1 
Electrical Wire Coding Electrical Symbols Electrical System Component Load Electrical Schematic Index Reading/Referencing Electrical Schematics  4C1 4C2 4C5 4C6 4C8 

91-Cont./Effec. Page 91-3 Revised: February 28, 2002
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91-Cont./Effec. Page 91-4 Issued: April 1, 1997
4B4

GENERAL.
TORQUE REQUIREMENTS.
Chart 9101 lists the torque values for flared fittings of various sizes and material.  The torque values given in Chart 9102 are derived from oil-free cadmium-plated threads and are recommended for all airframe installation procedures where torqueing is required, unless otherwise noted.  Propeller torque values are found in Chapter 61 of this manual.
— CAUTION —
DO NOT OVERTORQUE FITTINGS

— Note —
Properly lubricate the male threads, when installing flared fittings.  Torque the fittings in accordance with Chart 9101.
CHART 9101.  FLARE FITTING TORQUES

TORQUE (INCH-POUNDS) 
TUBING OD INCHES  ALUMINUM - ALLOY TUBING FLARE - AND 10061 OR AND 10078  STEEL TUBING FLARE AND 10061  HOSE END FITTING AND HOSE ASSEMBLIES 
MINIMUM  MAXIMUM  MINIMUM  MAXIMUM  MINIMUM  MAXIMUM 
1/8  ——  ——  ——  ——  ——  —— 
3 16  — —  — —  90  100  70  100 
1/4  40  65  135  150  70  120 
5/16  60  80  180  200  85  180 
3/8  75  125  270  300  100  250 
1/2  150  250  450  500  210  420 
5/8  200  350  650  700  300  480 
3/4  300  500  900  1000  500  850 
1  500  700  1200  1400  700  1150 
1 - 1/4  600  900  ——  ——  ——  —— 
1 - 1/2  600  900  ——  ——  ——  —— 
1 - 3/4  ——  ——  ——  ——  ——  —— 
2  — —  — —  — —  — —  — —  — — 

91-00-00 Page 91-5 Issued: April 1, 1997
CHART 9102.  RECOMMENDED NUT TORQUES

TORQUES: The importance of correct application can not be overemphasized.
CHART  B

Undertorque can result in unnecessary wear of nuts and bolts as well as the parts they are holding together. When insufficient pressures are applied, uneven loads will be transmitted throughout the assembly which may result in excessive
COARSE THREAD SERIES

wear or premature failure due to fatigue. Overtorque can be equally damaging because of failure of a bolt or nut from overstressing the threaded areas. The following procedures should be followed to assure that the correct torque is
BOLTS applied:
Steel Tension

1.  Self-Locking Fasteners - Add the friction torque from Chart “A” for sizes 8 through 7/16 to the recommended torque from Chart “B” to get the final
AN 3 THROUGH AN 20
torque. This would be the actual reading on the torque wrench. To determine
AN 42 THROUGH AN 49
friction drag torque for sizes 1/2 through 1 1/4, turn the nut fully on to the
AN 73 THROUGH AN 81
bolt and determine the torque required to turn the nut. Add this friction drag
AN 173 THROUGH AN 186
torque to the torque given in Chart “B”.
　
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