EFFECTIVITY: 040-999
PAGE24 76-10-00
Jan 10/90
PIPERAIRCRAFT
PA-42-720 (Advanced Trainer)
MAINTENANCEMANUAL
C. EngineRunAdjustments(continued)
CHART 2
ENGINEALIGNMENT(Sheet2 of 2)
LEFTENGINE RIGHTENGINE
REVERSEH.P CHECK REVERSEH.P CHECK
Torque(Q) Lb-Ft Torque(Q) Lb-Ft x Np rpm x Np rpm x 0.00019 shp x 0.00019 shp
hpreversemust be 180+ 20,and20 hp hp reverse mustbe 180 + 20, and 20 differentialbetweenengines. hpdifferentialbetweenengines.
NOTE:Leftand right engine adjustments are alike.
3. EngineRunningAdjustments
NOTE: Whenadjustingenginelow idle or high idle,environmentalcontrolsystem bleed air andgeneratormustbe on.
(a) Lowidleadjustment.
(1.) Location: Fuelcontrolunit:
(a.) Woodward Type II fuel control unit see Figure 503.
(b.) WoodwardTypeIII fuel controlunitsee Figure 504. (2.) Position cockpitconditionlever in low idle detent. (3.) Set fuel control unit idle adjustmentto produce56 to 58 percent Ng.
(a.) Woodward Type II fuel control unit:Ng will change 0.05percentper flat adjustment.(b.) Woodward Type III fuel control unit: Ng will change 2.0percentper flat adjustment.
(b) High idle adjustment.
(1.) Location: Top section of fuel controlunit.
(a.) WoodwardType II: See Figure 503.
(b.) WoodwardType III: See Figure 504.
(2.) Positioncockpitconditionleversto high idle position. (3.) Set high idle stop screwto produce69to 71 percent Ng. One flat adjustment on type II andtypeIIIfuel control unitsresult in 0.3 percentchangein Ng.
NOTE: The following procedureonly applies toenginesequippedwith Woodward typeIIIfuel controlunits.
(c) WoodwardTypeIIIfuel control unitdeadbandadjustment.
(1.) Placebothcockpit condition leversin idle position.
EFFECTIVITY:
040-999
76-10-00 10/90
Jan
PIPER AIRCRAFT
PA-42-720(AdvancedTrainer)
MAINTENANCEMANUAL
C. EngineRunAdjustments(continued)
3. Engine Running Adjustments (continued)
(c) WoodwardtypeIIIfuelcontrolunit dead bandadjustment.(continued)
(2.) Referto Figure 405. On each engine,disconnectpush-pullwire rope rear end clevisfrom propellercam. (3.) Adjust bothengineinterconnectrodlengthsso that distanceX between centersof rod end bearing installation bolt holes is 8.6 inches. (4.) Using bolt, washer, andcastellatednut,install one rod end in bottom hole of cam assemblyfuel control unitactuatinglever.Safetywithcotterpin. (5.) Using bolt,washer,and castellated nut, install second rodend to outer or top hole of fuel controlunit fuel control arm. Safety with cotter pin. (6.) Refer to Figure 509. Pull cockpit powerleverinto reverse range just far enough to move fuelcontrol unit deadbandstopscrewoff dead band stop. (7.) Insert a piece of paperbetweendeadband screw anddeadband stop. Slowly move linkagetoward forward range until:
(a.) Deadband screw contactsstopwith just enoughpressure to holdpaper tight.
(b.) Any movement of linkage towardreverserange will release paper.
(8.) Referto Figure 406. Using a protractor,measureandrecord angle W, betweenpropeller cam assemble riggingplate,andthrottle arm.
(9.) Refer to Figure 509. Pushfuel control unitlinkage toward forwardrangeto point where papercontinuesto be held betweenscrewand stop, butfurthermovementwouldlift dead bandscrew off stop.
(10.) Refer to Figure 406. Measureand record new angle W between propellercamassemble rigging plate and throttle arm.
° °
(11.)Differencebetweenanglesmeasuredin steps (8.) and (10.) shouldbe24to 26. Adjust deadband stop screwas required. NgMaximum ForwardStop 0.33%N1 Per Flat DO NOT ADJUST
Serrated Spacer Dead Band Stop
andPower Lever Screw and Adjustment
DO NOT ADJUST
High IdleAdjustment Power Lever 0.3% Per Flat
MaximumReverse
0.6% N1 Per Flat
Woodward Type III Fuel Control Unit
Figure 509
EFFECTIVITY:
040-999
Jan10/9076-10-00
PIPERAIRCRAFT
PA-42-720(Advanced Trainer)
MAINTENANCEMANUAL
C. EngineRun Adjustments (continued)
CHART3
1900 RPM TORQUECURVE
-860
EXAMPLE:
GIVEN:
1. PA-500 FT
°
2. OAT 30
80
=
45 35 25 15 5 5 5 25 45 45
040-999
76-10-00
PAGE27
76-10-00Jan
PIPERAIRCRAFT
PA-42-720(Advanced Trainer)
MAINTENANCEMANUAL
C. Engine Run Adjustments (continued)
3. Engine Running Adjustments (continued)
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