5/16-24 100 140 60 85 120 145 70 90 40 65 25 40 3/8-24 160 190 95 110 200 250 120 150 75 110 45 70 7/16-20 450 500 270 300 520 630 300 400 180 280 110 170 1/2-20 480 690 290 410 770 950 450 550 280 410 160 260 9/16-18 800 1,000 480 600 1,100 1,300 650 800 380 580 230 360 5/8-18 1.100 1,300 660 780 1,250 1,550 750 950 550 670 270 420 3/4-16 2,300 2,500 1,300 1,50(3 2,650 3,200 1,600 1,900 950 1,250 560 880 7/8-14 2,500 3,000 1,500 1,8003 3,550 4,350 2,100 2,690 1,250 1,900 750 1,200
1-14 3,700 4,500 2,200 3,300 4,500 5,500 2,700 3,300 1,600 2,400 950 1,500 1-1/8-12 5,000 7,000 3,000 4,2003 6,000 7,300 3,600 4,400 2,100 3,200 1,250 2,000 1-1/4-12 9,000 11,000 5,400 6,6003 0 11,000 13,400 6,600 8,000 3,900 5,600 2,300 3,650
EFFECTIVITY:

91-00-00 Jan 10/90

PIPERAIRCRAFT
PA-42-720(AdvancedTrainer)
MAINTENANCEMANUAL

F. Lubricationof Threads
Lubricateall fittings on external lines, including attachment pointsat engine and other components,
with proper lubricant (specifiedin Chart 8).
Whenapplyingthread lubricants, proceedas follows:
1.
Thoroughlycleanthreads before applyinglubricant.

2.
Use thread lubricant sparingly.

3.
Apply thread lubricant to male threadsonly.

4.
Lubricatefirst three threads only on straight fittings.

5.
Do not lubricate first two threads on tapered fittings;apply lubricant to next three threads only.

6.
Ensure lubricant doesnot enter fittings or flared areas.

7.
Lubricateanyfittings going to engine with same fluid going throughlines.

CHART 8
THREADLUBRICANTS

TYPE OF LINE TYPEOF LUBRICANT
Brakes/Hydraulic MIL-H-5606
Deicer (Air) TT-A-580(JAN-A-669),Anti-SeizeCompound(White Lead Base)
Fuel MIL-T-5544,Anti-Seize,GraphitePetrolatum
Oil MIL-G-6032, Lubricating Grease(Gasolineand Oil Resistant)
Oxygen MIL-T-5542,ThreadCompound, Anti-Seize andSealing,Oxygen System Pitot and Static TT-A-580 (JAN-A-669), Anti-SeizeCompound(WhiteLead Base) Engine-Bleed Air C5-A High Temperature Anti-SeizeCompound
G. Lubricationof Gaskets and Seals
Lubricategasketsand O-ring seals with same fluid they are sealing.
EFFECTIVITY:
040-999

PAGE
1891-00-00
Jan 10/90
PIPER AIRCRAFT
PA-42-720 (Advanced Trainer)
MAINTENANCE MANUAL

H. Decimal Conversion
CHART 9
DECIMAL CONVERSIONS

T03 TO2 M.M. 4ths 8ths 16ths 32nds 64ths PLACESPLACESEQUIV
T03 T02 M.M.
4ths 8ths 16ths 32nds 64ths PLACESPLACES EQUIV

316 .397 13.097
.016 .02 33/64 .516 .52
1/64 1/32 .031 .03 17/32 .531 .53 13.494
031 .794
3/64 .047 1.191 35/64 .547 .55 13.891
047 .05
1/16 .062 .06 9/1 6 .562 .56 14.288
062 1.587
078 1.984 3/32 .094 .09 2.381 19/32 .594 .59 15.081 7/64 109 .11 2.778 39/64 .609 .61 15.478
5/64 .078 .08 37/64 .578 .58 14.684
1/8 .125 .12 3.175 5/8 .625 .62 15.875 9/64 .141 .14 3.572 41/64 .641 .64 16.272 5/32 .156 .16 3.969 21/32 .656 .66 16.669 11/64 .172 .17 4.366 43/64 .672 .67 17.065 3/16 .188 .19 4.762 11/16 .688 .69 17.462 13/64 .203 .20 5.159 45/64 .703 .70 17.859 7/32 -.219 .22 5.556 23/32 .719 .72 18.256 15/64 .234 .23 5.593 47/64 .734 .73 18.653 .250 .25 6.350 3/4 .750 .75 19.050 17/64 .266 .27 6.747 49/64 .766 .77 19.447 .281 .28 7.144 25/32 .781 .78 19.844
9/32
20.241

19/64 .297 .30 7.540 51/64 .797 .80 5/16 .312 .31 7.937 13/16 .812 .81 20.637 21/64 .328 .33 8.334 53/64 .828 .83 21.034 .34 8.731 27/32 .844 .84 21.431
11/32 .344 23/64 .359 .36 9.128 55/64 .859 .86 21.828
3/8 .375 .38 9.525 7/8 .875 .88 22.225 25/64 .391 .39 9.922 57/64 .891 .89 22.622
13/32 .406 .41 10.319 29/32 .906 .91 23.019
27/64 .422 .42 10.716 59/64 .922 .92 23.416 7/16 .438 .44 11.112 15/16 .938 .94 29/64 .453 .45 11.509 61/64 .953 .95 24.209 31/32 .969 .97 24.606
15/32 .469 .47 11.906 31/64 .484 .48 12.303 63/64 .984 .98 25.003 .500 .50 12.700 1.000 1.00 25.400
EFFECTIVITY:
040-999
91-00-00 PAGE19
91-00-00 Jan 10/90

PIPER AIRCRAFT
PA-42-720(AdvancedTrainer)
MAINTENANCEMANUAL

I. Special Torques
CHART 10

SPECIALTORQUES
ENGINEMOUNTING BOLTS AND COMPONENTS: 
BreatherTakeoff  20 -30 in.-lbs. 
GasGenerator Tachometer  65 -85 in.-lbs. 
PropellerTachometer  65 -85 in.-lbs. 
SparkExciter  65 -85 in.-lbs. 
OverspeedGovernor  125 -170 in.-lbs. 
EngineMountingPads  225-300 in.-lbs. 
Engine Mount to Firewall Fittings  170 -200 in.-lbs. 
Engine Mount  450 -500 in.-lbs. 

NOTE: All engine nut, bolt, or screw torques must be obtained usinga thread lubricant,engine oil, or equivalent. Run nut or bolt down to near contact with the washer or bearing surface andcheck "friction drag torque"requiredto turn nut or bolt. Add the friction dragtorqueto the desired torquerecommended.
　
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