B. Jacking(Figures 1 and 2)
NOTE: Jacking mustbe done in a wind protectedarea on a level surface.
The lifting arrangementfor the PA-42-720 (Advanced Trainer)consistsof a jacking pad on each wing, outboardof the nacells, a nose padforward of the nose gearand a removable tail jacking padwhich attachesin front of the tail tie-down ring (Figure 1). Adjustable 25 inch tripod jacks must be used. Eightton capacity wing jacks and two ton capacitynose and tail jacks are recommended forthe following procedure:
(1)
Mounttailjackingpad(shown in Figure 1).
(2)
Temporarilyalign jacks under their respectivejack pads.
(3)
Pump jacks up to pads. While jacking, realign jacksas necessary. Ensurejackheads fit properly with their pads and jacks are not slanted.
(4)
Carefullyraisewing and nose jacks until all wheelsclear the surface;maintaina level airplane.
CAUTION: CARE MUST BE USED IN APPLYING PRESSUREAT THE TAIL JACKING PAD. EXCESSIVELOADS CAN DAMAGE THE AIRCRAFTSTRUCTURE.
(5)
Raisetailjack to maintain contact with tail jacking pad.
JACK PAD ATTACH SCREWS VENTRAL FIN
(4 REQ'D)
TAIL JACK PAD
P/N 72246-10
TAIL TIE DOWN RING
JACK CENTERING
CONE (INTEGRAL TO
TAIL JACK PAD)
JACK
Useof Tail JackingPad Figure 1
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B. Jacking(continued)
I TOOL P/N 72246-10
DISTANCESTOJACKPOINTS(Ground to Structure) JACKPOINTAND DISTANCESWHENSTRUTSAT: STRUTAFFECTED MIN. EXTENSION MAX.COLLAPSED
WING/MAING. NOSE/NOSEG. 51 IN. 44IN. 32 IN. 25 IN.
JackingArrangements
Figure 2
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A. Shoring
Whensupportingthe aircraft at points otherthanjackingpads,loads mustbe carefullydistributedto avoidoverstressinglocalstructures.To shore fuselageand wings, usewoodencontourblocksas shownin Figure 7-3. The fuselage is supported by a single blockat Fuselage Station(F.S.)93.0. A pair of blocks at F.S. 297.38 and 310.0 are mounted togetheron a transversepivotat F.S. 304.0 to equallydistribute weight of the aft fuselage. The wing is supported by single blocks as Wing Station (W.S.)30.0 and W.S.109.5. All blocks aremadeof 2 x 10's, and are lined with carpetor heavy foam rubberalongcontactfaces.
ShoringArrangements
Figure 1
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A. Shoring(continued)
FUSELAGECONTOUR-1 INCH GRID
NOTE:ALLOWFORCOMPRESSED THICKNESSOF PADDING WHEN PLOTTINGCONTOURBOARDS. FUSELAGE SKINCONTOUR
CENTERLINE OF AIRPLANE
FUSELAGESTATION93.0 FUSELAGE SKIN CONTOUR
FUSELAGE SKINCONTOUR
CENTERLINE
OF AIRPLAN
CENTERLINE OFAIRPLANE
/
FUSELAGESTATION297.38
FUSELAGESTATION310.0
WINGCONTOUR-1 INCH GRID
WINGSTATION30.0 WINGBOTTOMSKINCONTOUR
WINGSTATION109.5
Fuselage andWingShoring Figure2
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A. Shoring(continued)
The centerlinelocations,loads on and strap widths are shown in the table below. Theforward strap can be no less than 12 inches wide and the aft strap 15 inches wide. (See Figure 3)
LOCATIONF.S. STRAPWIDTHIN LOADPSI
Front F.S. 40.0
(1) 12 138.06
(2) 24 69
Aft F.S. 230
(1) 15 100.54
(2) 30 50.3
Guide wires will be needed on wing tips, nose, and tail. To facilitate the attachment of the guide wires the tip tank fairings and nose radome will need to be removed. The tail guide wire can be attached to the tail tie down. These guide wires are to be used for stability only. The guide wires will need one personper wire to guide the lifting and moving of the aircraft.
a = NOT TO EXCEED 45° 138.50
13.81"
F.S. FS GUIDE WIRE 4000 GUIDE WIRE
GUIDE WIRE GUIDE WIRE GUIDE WIRE
SlingLocationF.S.
Figure 3
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PIPER AIRCRAFT PA-42-720(AdvancedTrainer) MAINTENANCE MANUAL 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：夏延飞机维护手册 Cheyenne IIIA PA-42-720 AMM 1(33)
