(k)
Move"MINUS"leadto RRand repeatstep (j)forAVCR.
(I)
Moveflapselectordownand disengagemotorbreaker.
(m)With DVM"PLUS"leadin RC and"MINUS"in RL,checkthatvoltagehasnotchangedfrom
that in step (e)(If voltagehaschangedby more than0.03V,repeatthe entireproceduretaskingspecialcarewhenlockingactuatorarmto pot. shaft.)
(n)
Adjust RT2sothat RC/RLvoltagechangesby theamountof the AVCLCalculatedin step(i) -then, adjustRLpot. shaftso that RC/RLchangesinthe oppositedirectionby AVCL. RC/RLvoltagewill nowbethe sameas measuredin step(m).
(o)
Move"MINUS"leadto RRandcheckthat RC/RRvoltagehas notchangedfromthat in step (f).
(p)
Adjust RT3sothat RC/RRvoltagechangesby the amountof AVCRcalculatedin step(j)-then,adjust RRpot. shaftsothat RC/RRchangesin the oppositedirectionby A VCR. RC/RRvoltagewill nowbe the sameas measured in step (o).
(q)
Engageflap motor breakerandmoveflapsto UP.
(r)
MeasureRC/RLas in step (h). Voltagemustbe -0.05Vminimumand -0.15Vmaximum.
(s)
MeasureRC/RR. Voltagemustbe -0.05Vminimumand -0.15Vmaximum.
(t)
Moveflapsto the DOWNposition.
(u)
MeasureRC/RL. Voltagemustbe +0.05Vminimumand+0.30Vmaximum.
(v)
MeasureRC/RR.Voltagemustbe +0.05Vminimumand +0.30Vmaximum.
NOTE: Ifthe requirementsof steps(q) and (t) arenot met,repeatthe procedurefromstep(g) withoutpre-settingRT2andRT3. ThecalculatedAVCLand AVCRwill be smaller andthe entire riggingprocedurewill be easierwitheach repetition.
(w)
InsertDVMtest leadsintoRL and RR. Moveflaps UPand DOWNWhileobservingvoltagereadingon DVM. The readingmustnotexceed± 0.10V
(x)
Runflapsthroughfull cyclethreetimesto ensureproperoperation.
(y)
Measureflapdeflectionat full down(30± 1°) andapproach(10+ 1°) positionon both leftand right handside.
(z)
Checkpositionindicatorreadingsagainstflapselectorandflapdeflectionas follows:
(1.) Whenmeasuringflapdeflectionangles,lift flaptrailingedge to eliminateplaybetween rollersand trackslot. If indicatordoesnot correspondto flap position,placeflaps in APPROACHposition.
(2.) Adjustflap indicatortrimmer,locatedon inboardend of flapamplifierbox(oppositeconnectorend),so flapindicatorneedlefalls in centerof approachgraduation.(3.) Checklocationofflap indicatorneedlein UPand DOWNpositionsand adjusttrimmersoneedlecenterlinefalls withinor tangentto upperand loweredgeof graduationin UP,APPROACH,and DOWNpositions.
NOTE: If trimmeris rotatedto raiseneedle,needlemustrisean equalamountin allthree positions.
(4.) If unableto adjustindicatorneedlefor properindication(as in example below),proceedwith steps(a.)thru (e.) below:
EFFECTIVITY:
PAGE 18 040-999
Jan 10/9027-50-00
PIPER AIRCRAFT
PA-42-720 (Advanced Trainer)
MAINTENANCE MANUAL
A. Flaps (continued)
22. ElectricalRiggingProcedure (continued)
EXAMPLE
Flap Position Needle Indicator
UP Center of Graduation APPROACH Center of Graduation DOWN BelowDOWN Graduation
(a.) Adjust indicator trimmer so flap indicator needleis at upper tangent of graduation at
UP and APPROACH positions. (b.) Adjust RT3 so needle falls with down graduation. (c.) Recheck indicator at UP, APPROACH, and DOWN positions. Readjust trimmer as
required. (d.) Recheck VLR and readjust as necessary. RT2 could require readjustment. (e.) Ensure VL and VR are still within limits of VC specified and ensure positionindicator
agreeswith flap position in UP, APPROACH, and DOWN positions.
(aa) Locate flap system test switch on lower instrument panel. Move flap selector handle to approach position, activate test switch, and ensure wing flap caution light, located in annunciator panel, illuminatesand flap travel stops. Release test switch and check flaps for properopperation.
(bb) Remove 30 amp fuse installed in step (a). Install all access plates and panels.
EFFECTIVITY: 040-999
27-50-00PAGE
Jan 10/90
A. Flaps (continued) PIPERAIRCRAFT PA-42-720(AdvancedTrainer) MAINTENANCEMANUAL
FLAPRIGGING WORK SHEET
FLAPSDOWN FLAPS UP STEP 1. STEP 2. STEP 3. RC (+) to RL (-) RC (+)to RR (-) RC (+) to RL (-) VOLTAGE -( CHANGE BY) (MULTIPLY) x VCL= 2 + + V V V V V V
STEP 4. RC (+) to RR (-) VOLTAGE ( CHANGE BY ) (MULTIPLY) x VCR= 2 - V V V
FLAPS DOWN STEP 5. STEP 6. ( SAME AS STEP 1. ± 0.03)V ±
ADD VCL (STEP 2. ) ADJUST RT2 POT. TO +
CHECK ADJUST RL SHAFT
STEP 7. STEP 8. RC/RL VOLTAGE ± ±
ADD VCR(STEP 4. ) ADJUST RT3 POT. TO
CHECK ADJUST RR SHAFT
RR/RC VOLTAGE +
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