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51-10-00,Figure604 shows typical bulkhead and channel cracks.
51-10-00, Chart 601 lists item numbers, part numbers, descriptions, reference pages, and actions
required if a crack is found during inspection. The required inspection is visual only.
51-10-00,Figure605 shows typical inspection areas listed in 51-10-00, Chart 601, and where
applicable,appliesto both left and right sides.
51-70-00,Figure 801 shows approved repair method.
All items in 51-10-00, Chart 601 must be inspected at 12,382 airframe flight hours and repaired if
cracks are found.
In addition, items 33, 68, and 99 must be inspected at 13,978 airframe flight hours.
EFFECTIVITY:
040-999
51-70-00 PAGE
Jan10/90
PIPERAIRCRAFT

PA-42-720(AdvancedTrainer)
MAINTENANCEMANUAL

B. Fuselage Repairs -Pressurized Section (continued)
"J" Stringer Splice (Typical) R-1 and R-2
View A -A
12 ( Per Side) Rivets, MS20470-AD4 Equally Spaced with .375 Edge Margin.
EFFECTIVITY:
040-999

Jan 10/9051-70-00
PIPER AIRCRAFT
PA-42-720(Advanced Trainer)
MAINTENANCE MANUAL

B. FuselageRepairs-Pressurized Section (continued)
Bulkhead Repair (continued) R-3

9 Each MS20470AD4
EvenlySpaced
9 Each MS20470AD4

Evenly Spaced
17 Each MS20470AD4

EvenlySpaced
17 Each MS20470AD4

to Match Bulkhead
A

Repair for Left and Right Sides Similar Repair may be made using P/N 56287-18 bulkhead.
StructuralRepairs
Figure 801 (Sheet 2 of 17)

EFFECTIVITY:
040-999 51-70-00Jan10/90
PIPERAIRCRAFT
PA-42-720(AdvancedTrainer)
MAINTENANCEMANUAL

B. FuselageRepairs-PressurizedSection(continued)
BulkheadRepairR-4
On

PickupExistingPattern
View A-A  TrimBackToClearCups
Repairfor Left and RightSidesSimilar  Material:.0402024-T3Aluminum
StructuralRepairs
Figure801 (Sheet3 of 17)

EFFECTIVITY: 040-999

Jan
109051-70-0010/90
PIPERAIRCRAFT
PA-42-720(Advanced Trainer)
MAINTENANCEMANUAL

B. FuselageRepairs-Pressurized Section (continued)
Repairof Inner Skin (Typical) R-5
F.S.113.0

I Viewof Inner Skin Installation withRepairAccomplished  24 Each MS20470-AD4Rivets Pickup Existing Pattern 
0 
8 Each MS20470-AD4 RivetsEquallySpaced  4.25" 

Material:.040 2024-T3 Aluminum
StructuralRepairs Figure801 (Sheet 4 of 17)

EFFECTIVITY: 040-999
51-70-00

PIPERAIRCRAFT
PA-42-720(AdvancedTrainer)
MAINTENANCEMANUAL

B. FuselageRepairs-Pressurized Section(continued)
BulkheadRepair(continued)
R-6

A
F.S.25.6
9 Each MS20470-AD4
Rivets 10Each MS20470-AD4
Rivets(Existing)
ExistingHole
View A-A

Repairfor Left and Right SidesSimilar  Repairmay be made fromP/N 56286-2 bulkhead withflangesremoved.
StructuralRepairs
Figure801 (Sheet 5 of 17)

EFFECTIVITY:
040-999

PAGE6 51-70-00
Jan 10/90
PIPERAIRCRAFT PA-42-720(Advanced Trainer) MAINTENANCEMANUAL B. FuselageRepairs-PressurizedSection(continued) BulkheadRepair(continued) R-7 
TypicalBulkheadLocation 
PickupExistingPattern( 4 Each) -26 EachMS20470-AD4Rivets  Bulkhead F.S.297.38 Bulkhead F.S. 280.0 

A
View A A
RepairmaybemadefromP/N56261-4bulkhead withflangesremoved.
StructuralRepairs
Figure801 (Sheet6of17)

EFFECTIVITY:
040-999
PAGE
51-70-00
Jan 10/907
PIPER AIRCRAFT PA-42-720 (Advanced Trainer)
MAINTENANCEMANUAL
B. FuselageRepairs-Pressurized Section (continued)
Typical Fuselage Center Bulkhead Repair
R-8

-Angle
Center Bulkhead

LongitudinalBeam Assembly Repair for Left and Right Sides Similar Material:.050 2024-T3 Aluminum StructuralRepairs Figure801 (Sheet 7 of 17) EFFECTIVITY: 040-999
PAGRE8
Jan 10/90 51-70-00
PIPER AIRCRAFT
PA-42-720 (Advanced Trainer)
MAINTENANCE MANUAL

B. Fuselage Repairs -Pressurized Section (continued)
Fuselage Skin Repair (Typical) R-9 and R-10

Note:
Stop Drill Cracks Before Adding Doubler
6 Each MS20470-AD5 Rivets 7 Each MS20470 -AD5 Rivets
6 Each MS20470-AD5 Rivets 7 Each MS20470 -AD5 Rivets
Material: .080 2024-T3 Clad Aluminum Bevel Sides 45 ° X .070 
Structural Repairs Figure 801 (Sheet 8 of 17) 
EFFECTIVITY: 040-999  51-70-00  PAGE9 

PIPERAIRCRAFT
PA-42-720(Advanced Trainer)
MAINTENANCEMANUAL

B. Fuselage Repairs -Pressurized Section (continued)
BulkheadShelfRepair R-11 
　
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