0.187 OR 0.250 0
steel disc
Holesdrilledin discforsmall punchtype object to assist in tightening the jam nut on pot
Special Socket for Calco Flap Rheoststs Figure 604
20. Preparationfor Rigging
CAUTION: ELECTRICAL POWER TO FLAP CONTROL SYSTEM MUST BE OFF. PULL FLAP CONTROL AND MOTOR CIRCUIT BREAKERS, SET BATTERY MASTER SWITCH OFF,AND DISCONNECT EXTERNAL POWER.
(a)
Removeaccessplatesin false sparat wing stations42.50, 53.00, 92.50,and 101.0for both rightand leftwings.
(b)
Removeaccessplatesonbottomsideof wings at wing stations34.50,42.50,82.75,and92.50.
(c)
Ensure flap positionsenderarmsrotate freely on potentiometershafts,with linkage rodssetat properlength(Figure 502, Sketch B).
(d)
With transmission assembliesnot attached to flap andturnedinto ball nut seat,ensureflaps
°
are free to roll full travel (0° to 30 ) on flap tracks.
(e) Attachflap rigging tools to wing station147.50to measureflap deflection angles.
EFFECTIVITY: 040-999
2750-00PAGE 15
Jan 10/90
PIPER AIRCRAFT PA-42-720 (Advanced Trainer) MAINTENANCE MANUAL
A. Flaps (continued)
ACTUATORARM
SKETCH B
TOOL P/N 71505-16, LH TOOL P/N 71505-17, RH
SKETCH A
Flap Rigging
Figure 502
EFFECTIVITY: 040-999
Feb 1/98 27-50-00
PIPER AIRCRAFT
PA-42-720(Advanced Trainer)
MAINTENANCE MANUAL
A. Flaps (continued)
21. MechanicalRiggingProcedure
(a) Adjustup limit actuatingboltbymanuallymovingleftflapso switchisactuatedwith flaptrailing edgeat 0° on riggingtools.
°°
(b) Manuallymoveleft flap to fulldown(30+ 1 -0°) positionon rigging tool. Turntransmission sleevesout fromforwardstops,recordnumberof turns,alignattachmentholein sleeves,with holesin respectiveflap horns,andtemporarilyinstallattachmentbolt. Adjustdown limit actuatingbolt to actuateswitch.
NOTE: Differencein numberof turnsbetweeninboardandoutboardtransmissionsmustnot exceed1/2turn.
(c)
Turn rightflaptransmissionsleevesoutfromforwardstops(usingequalnumberof turnsused for left flaptransmissionsleeves),alignattachmentholein sleeveswith holes in respectiveflap horns,and temporarilyinstallattachmentbolt.
(d)
Ensureproperalignmentof sleeveandflaphorn. If sleeve and horndo notalign, loosenbolts
attachinghornto flap,andtap horn to achieveproperalignment. Retorquehorn attachment bolts.
(e)
Withsleeveand hornproperlyaligned,connectsleeveto hornwithboltand castellatednut. Tightennut to allow0.03inchboltthrustplay. Installcotterpin.
(f)
Connectflexibledriveshaftsto transmissions.Ensuresplinesare properly engagedand install shaftattachingnutfingertight. Safetywith MS20995-C32wire.
22. ElectricalRiggingProcedure
(a) Removecoversfrom RT2and RT3onflapcontrolamplifier. Ensurebothtrimmersare
positionedfullyclockwise. Insert30 ampfuse(for test purposesonly)in flap motorelectrical powerconnection.
(b)
Applyexternalpowerto aircraftandestablishbusvoltageof 28 ± 0.5volts.
(c)
Placeflap selectorin DOWN position.
(d)
Engageflapcontrolcircuitbreaker,butdo notengageflap motorcircuitbreaker. Allowfive minutewarm-uptime.(Flapshouldstillbe downfrommechanicalrigging)
(e)
Insert"PLUS"test leadfromdigitalvoltmeter,intoRCtestpointon controllerand "MINUS"test
leadintoRL. Adjustshaftof left wing potentiometerfora readingof + 0.10v. and lockactuator armto pot shaft.Be surethatvoltagehasnotchangedwhilelockingactuatorarm. (Record voltageonworksheet.)
(f) Move"MINUS"test lead to RRtestpointand adjustrightwing pot.to +0.10v. Lockactuator
armto pot. shaft. Checkthat voltagedoesnotchangewhilelockingactuatorarm.( Record voltageon worksheet)
NOTE: All measurementsmustbetakenat controlamplifier.
(g) Depress(butdo not engage)motorcircuitbreakerand moveflapselectorto UP; ensureflap motoris wiredcorrectly(flapsmoveup). If not,reversewiring;if correct,engagebreaker.
NOTE: Ifflapswill notmoveto full up position, hooka jumper betweenRLand RR. When flapsare up removejumper.
(h) Withflaps in full up position, ensure.010minimumclearancebetweenactuatorsleevesand rubberseals.
EFFECTIVITY:
040-999 PAGE 17
27-50-00 PAGE 17
Feb 1/98
PIPER AIRCRAFT
PA-42-720 (Advanced Trainer)
MAINTENANCE MANUAL
A. Flaps (continued)
22. ElectricalRiggingProcedure(continued)
(i)
With DVM"PLUS"leadin RC and "MINUS"leadin RL,measureRC/RLvoltage. Thisvoltage
mustbenegative;if not,trimmersRT2and Rt3werenotfully adjustedcw in step (a).
(j)
Usingthe worksheet,performthe followingcalculation:Changethe magnitudeof rc/rl by0.10vand multiplythe remainderbe 2. The resultis definedas AVCL.
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