EFFECTIVITY: 040-999
91-00-00Jan 10/90
PIPER AIRCRAFT
PA-42-720(Advanced Trainer)
MAINTENANCE MANUAL
C. VendorInformation(continued)
CHART 4 VENDOR INFORMATION (Sheet 3 of 3)
Union Carbide; Plastic Div. 270 Park Avenue New York, NY 10017 212-551-3763
V
Virginia Chemical 3340 W. Norfolk Rd. Portsmouth, VA 23703 703-484-5000
W
Wooster Products, Inc. 1000 Spruce Street Wooster, OH 44691 800-321-4936 In OH 216-264-2844
D. EngineTorqueValues
NOTE: Obtainall enginenut, bolt, or screwtorquesusinga thread lubricant,engineoil, or equivalent
andtorquelimits.
CHART 5
ENGINE TORQUE VALVES
THREAD TORQUE TORQUE
SIZE MIN. IN.-LBS. MAX. IN.-LBS. REMARKS
.190-32 20 30 BreatherTakeoff
.250-28 65 85 Prop.and GasGeneratorTachometer
and SparkExciter
.3125-24 125 170 OverspeedGovernor
.375-24 225 300 EngineMountingPads
.374/.376 .437-20 170 450 200 500 EngineMountto Firewall Fittings EngineMount
145 165 ThrustBearingCoverNuts
215 240 Oil Drain Plug,AccessoryGearbox
45 55 Chip Detector, ReductionGearbox
65 75 Oil Drain Plug,Oil to Fuel Heater
EFFECTIVITY:
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Feb 1/98
PIPER AIRCRAFT
PA-42-720(Advanced Trainer)
MAINTENANCEMANUAL
E. Torque Requirements
Unlessotherwisenoted, torque values in Chart 7, derived from oil free cadmium-plated are
threads, recommended procedureswhere torquing is required. Engine and propeller
for all airframe installation torque values are found in the latest revision of the United Aircraft of Canada Limited Maintenance Manual, P/N 3013242. Chart 6 lists torque values for flared fittings of various sizes and materials.
CAUTION: DO NOT OVERTORQUE FITTINGS.
NOTE: When installing flared fittings, verify that male threads are properly lubricated. Use torque fittingsvaluesin Chart 6.
CHART 6
FLARE FITTING TORQUE VALUES
TORQUE -INCH-POUNDS
TUBING ALUMINUM -ALLOY STEEL TUBING HOSE END FITTING
OD TUBING FLARE -AND FLARE AND
INCHES 10061 OR AND 10078 AND 10061 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 500 1150
1-1/4 600 900
1-1/2 600 900
1-3/4
2
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PIPERAIRCRAFT
PA-42-720(AdvancedTrainer)
MAINTENANCEMANUAL
E. Torque Requirements (continued)
CHART 7 RECOMMENDEDNUT TORQUES (Sheet 1 of 2)
TORQUES:The importance of correct application can not be overemphasized.
Undertorque wear of nuts and bolts as well as the
can result in unnecessary
parts they are holding together. When insufficient pressures are applied,
unevenloads will be transmitted throughoutthe assembly which may result in
excessivewear or premature failure due to fatigue. Overtorquecan be equally
damagingbecause the threaded
of failure of a bolt or nut from overstressing
areas.The following proceduresshouldbe followed to assurethat the correct
torque is applied:
1.
Self-LockingFasteners-Add the friction torque from Chart'A' for sizes 8 through 7/16 to the recommended
torquefrom Chart 'B' to get the final torque. This would be the actual reading on the torque wrench. To determinefriction drag torque for sizes 1/2 through 1 1/4, turn the nut fully on to the bolt and determine the torque requiredto turn the nut. Add this friction drag torque to the torque given in Chart B'.
2.
Castellatedand Non-Self Locking Nuts -Use only the torque given in Chart'B'. Unlessotherwisespecified,whencastellatednutsare used with a cotter pin on moving joints, do not torque the nut. Turn the nut onto the bolt until proper grip is established and alignmentwiththe cotter pin hole is achieved. Then install the cotter pin.
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