(b)
If the crack lengthexceedsfifty percent of the distance betweentheedgeand the bend radius tangentline,butdoes not extend intothebend radius, proceedasfollows: (1.) Stopdrill the crack as specified in Chart 801. (2.) Add a formed doublerofthe same material,thickness,andcontouras the web.

NOTE:Doublerdetailsmustbeasshownin Figure 801.
NOTES:
EFFECTIVITY:
040-999
PIPERAIRCRAFT
PA-42-720(Advanced Trainer)
MAINTENANCEMANUAL

7. Repairof Cracked or Tom-out DimpledHoles Around Generator Cooling Scoop
Cracks in dimpled area of cowlskin stop drill per 51-40-00, Chart 801
.098 hole ; Countersink 100 X .179 dia. on outside surfaceof outer cowl skin (11 places). Mate with doubler.
Install doubler on inside -surface of outer cowl skin.
Cowl Repair
Figure802 (Sheet 1 of 2)

EFFECTIVITY:
040-999

Jan 109051-10-00
Jan 10/90 51-10-00
PIPER AIRCRAFT
PA-42-720 (Advanced Trainer)
MAINTENANCE MANUAL

7. Repair of Cracked or Torn-out Dimpled Holes Around Generator Cooling Scoop (continued)
7.60

.257 hole (6 places); Dimple
°
100 X .437 dia. far side. Mate with existing holes in cowl skin.
Doubler .025 2024-T3
aluminumsheet

.098 hole (8 places);
Countersink 100 ° X
.179 dia. near side.

1.OOR(Typ)
Equally spaced between dimpled holes ( 4 places)

NAS1097AD3 ( 8 places)
double flush on installation

Cracked or torn -out dimpled 
holes around generator 
eductor (upper cowl ) and 
fresh air inlet (lower cowl). 
surface of cowl skin 
Cowl Repair 
Figure 802 (Sheet 2 of 2) 
EFFECTIVITY: 
040-999  Jan 
51-10-00  Jan  10/90 

PIPER AIRCRAFT
PA-42-720(AdvancedTrainer)
MAINTENANCEMANUAL

8. Fuselage Repairs -Pressurized Section
Wheneverpossible,an inset is provided inthe upper part of the page with the shaded portion indicatinga typical area where repair could be required. The material to be used in the repair is specified either on the illustration or in the lower right hand section of the page.
51-10-00,Figure 604 shows typical bulkheadand 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,Figure 605 shows typical inspection areas listed in 51-10-00, Chart 601, and where applicable, applies to 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 30,417 airframe flight hours for effectivity code A and 12,382 airframe flight hours for effectivity code B and repaired if cracks are found.
In addition, items 33, 68, and 99 must be inspected at 34,337 airframe flight hours for effectivity code A and 13,978 airframe flight hours for effectivity code B.
Bulkhead End Repair

Bulkhead Stringer Cut-Out Area Repair
\ Channel Repair

For bulkhead and channel crack repair, see FAA Acceptable Methods,Techniques,and Practices -Aircraft
Inspectionand Repair Manual.
Arrows indicate areas prone to cracking.

Crack Type Identification
Figure 604

EFFECTIVITY:
A: 040-044, 053, 055, 057, 059
B : 045-052, 054, 056, 058, 060-999

Apr15/91 51-10-00
PIPER AIRCRAFT
PA-42-720(AdvancedTrainer)
MAINTENANCEMANUAL

9. InspectionItem, Part, Description,ReferenceandAction
CHART 601
INSPECTION AREAS

REPAIR ITEM NO. PART NO. DESCRIPTION REF. PAGE ACTION
1 56642-3 Bulkhead 19 X 2 45162-20 Bulkhead 16 X 3 -INTENTIONALLY LEFT BLANK -4 -INTENTIONALLY LEFT BLANK -5 45234-14 Bulkhead 18 X 6 56284-25 Bulkhead 15 X 7 45648-3 Frame 20 X 8 45224-2 Bulkhead 18/ R-19
*17 R-19 9 56243-10 Bulkhead 15 X 10 45151-20 Bulkhead 16 X 11 45234-2 Bulkhead 18/ R-20 *17 R-20
12 -INTENTIONALLY LEFT BLANK -13 56076-4 Bulkhead 19 X 14 56796-28 Bulkhead 15 X
15 56068-3 Bulkhead 19 X 16 -INTENTIONALLY LEFT BLANK -17 56068-3 Bulkhead 19 X 18 56688-14/-10 Bulkhead 15 X 19 56796-24 Bulkhead 15 X 20 -INTENTIONALLY LEFT BLANK -21 54111-20 Bulkhead 15 X 22 -INTENTIONALLYLEFT BLANK -23 56507 Bulkhead 14 X 24 56775-48 Stringer *2 R-1 25 56053-14 Clip 14 R 26 56775-49 Stringer *2 R-2 27 56053-15 Clip 14 R 28 45086-2 Channel 14 X 29 -INTENTIONALLY LEFT BLANK -30 56287-18 Bulkhead 15/ R-3
*3 R-3 31 56036-8 Bulkhead *4 R-4 32 80033-4 Clip 14 R
33 56254-2 Channel 14 X 34 45150-7 Bulkhead 14 X 35 57628-6 Strap *5 R-5 36 -INTENTIONALLYLEFT BLANK -37 56740-7 Strap *5 R-5 38 56286-20 Bulkhead 15/ R-6
*6 R-6 39 56790-3 Clip 17 R 40 45191-9 Bulkhead 17 X
* See 51-70-00
　
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