AC 20-64 CHG 1 Appendix 6 10/26/73 2 4 5 6 PAGE REF.
MAJOR FOR S/N NO. ASSEMBLY ITEM SERVICE HISTORY ILLUST. CODE W-20 Outer Wing Upper Wing Planks Cracks have occurred in the No. 29 Surface Nos. 1 & 2 1 Plank at the nacelle fillet 30 attachments at the inboard side 53 of all four nacelles.
W-21 Outer Wing Upper Wing Plank Cracks have occurred in No. 3 53 Surface No. 3. upper wing panel along the first W.S. 101-137, row of fasteners adjacent to the 257-275, skate angle of the outboard 275-329, nacelle.
and 346 W-22 Outer Wing Lower Wing Plank Cracks have occurred in Plank 54 Surface No. 1 No. 1 from forward edge W.S. 75-153, attachment holes.
223-329, and 385 Outbd.
W-23 Outer Wing Upper Rib Attach Cracks have occurred in the rib 46 and Lower Surfaces Clips clips located at the rear beam W.S. 179 P/Nos: forward face upper attachment.
W.S. 197 805483-1/-2 805491-1/-2 805482-3/-4 805492-1/-2
AC 20-64 CHG 1 Appendix 6 10/26/73 Page 21 7 8 9 10
RECOMMENDATIONS
METHOD FREQUENCY TYPE OR METHOD
OF OF OF PREVENTIVE INSP. INSPECTION REPAIR ACTION Visual, Eddy Initial inspection Current, Dye within 400 flight hours.
Penetrant Repeat inspections at intervals not to exceed 1400 flt. hours until preventive reinforcements are incorporated.
Type A, Type B, Type C and Type D repair, as appropriate, or Type C repairs in accordance with LAC and reinforcements Service Bulletin 88/SB-649B. or 88/SB-675 reinforcement.
Visual Initial inspection within 700 fIt. (1) Repair cracks in wing panel Service Bulletin inspection hrs. unless previously inspected per Dwg. 841507B. 88/SB-652C, for cracks. within 350 hrs. Repeat at normal paragraph 2E.
Eddy structural maint. inspection (2) Repair cracks around Ref: Dwg.
current or intervals until preventive access doors per Dwg. 841507B.
x-ray reinforcement is incorporated. 841655A.
optional.
Visual Initial inspection within 1000 and D y e flight hours of Service: etin Penetrant issue unless previously inspected Repair in accordance with LAC Service Bulletin Service Bulletin 88/SB-653A 88/SB-653A, and Dwg. No. 841441B Repair | paragraph 2C. (1).
within 500 hours. Installation Nos. 841441-175, Installation No.
- 176, 177, 178, - 179, -180, 841516-137.
Repeat inspections at 4000 hour - 193, -195, and 196.
intervals until preventive reinforcement is installed.
Visual Dye n aircraft having 10,000 flight Penetrant hours or more, inspect in next 700 hours. Repeat inspection at standard structural inspection interval.
(1) Rework existing clips in Same as Column 9, accordance with Dwg. 841509. Item (2).
(2) Install replacement clips per Dwg. 841509 in accordance with LAC Service Bulletin 88/SB-654.
AC 20-64 CHG 1 Appendix 6 10/26/73 2 3 4 5 6 PAGE REF.
MAJOR FOR S/N NO. ASSEMBLY ITEM SERVICE HISTORY ILLUST. CODE W-24 Outer Wing Trailing Trailing Loose fasteners and cracks have 36 Edge, Flap Stations Edge Skin occurred in the wing trailing 125 to 331 Panels, edge skin panels and trailing Trailing edge rib webs and flanges.
Edge Ribs.
W-25 Outer Wing Upper Upper Cracks emanating from the 37 Surface Plank No. 1 leading edge have occurred in 40 W.S. 156-178 W.S. 168-174 the No. 1 upper planks inboard of the No. 2 and No. 3 nacelles.
Upper Forward Cracks have occurred in the aft Spar Cap tang of the upper front spar cap W.S. 156-178 emanating from the first attachment hole in area of the inboard skate angle of the inboard nacelles.
AC 20-64 CHG 1 Appendix 6 10/26/73 Page 23 7 8 9 10
RECOMMENDATIONS
METHOD FREQUENCY TYPE OR METHOD
OF OF OF PREVENTIVE INSP. INSPECTION REPAIR ACTION Visual (from Conveniently scheduled inspection Electra Structural Repair Service Bulletin access holes period. Manual, Sections 57-4-1, 88/SB-655, to Inter- 51-2-14, and 51-3-9. paragraph 2.C.
costal) and Repeat at normal inspection Ref: Dwg.
X-ray (trom intervals. 841512 Intercostal to T.E.).
Verify cracks using D y e Penetrant (Requires skin removal).
Visual, As specified in Per Repair Index Dwg. 841628 Per Drawing X-Ray LAC 88/SB-665D. No. 1 plank: in accordance with Service 841628 in initial inspection within next 50 Bulletin 88/SB-665D: accordance with fIt. hours with repeat inspections 88/SB-665D at intervals not to exceed 625 hours. Spar Cap: 1250 fIt. hour Wing Upper Surface Ref: Dwg.
repeat inspection intervals increasing to 2500 flt. hour Dwg. 841580D 841576A intervals after No. 1 plank is 841581B 841577B reinforced or repaired. 841582B 841578A 841579A Special repeat inspections may be Wing Upper Front Spar Cap discontinued for No. 1 plank and spar cap when their respective Dwg. 841623B repairs or reinforcements are 841624B incorporated.
Appendix 6 AC 20-64 CHG 1 Page 24 10/26/73 2 3 4 5 6 PAGE REF.
MAJOR FOR S/N NO. ASSEMBLY ITEM SERVICE HISTORY ILLUST. CODE W-26 Outer Wing Lower Wing Planks Cracks have occurred in the 35 Surface Nos. 1 thru lower wing planks in the 44 W.S. 157 to 8 vicinity of the Main Landing 54 W.S. 219 Gear ribs at W.S. 167 and 209. 55 W-27 Outer Wing Front Upper Cap Cracks have occurred in upper 50 Spar and Spar spar cap vertical leg and in web 51 W.S. 168 Web at rib attach bolts at W.S. 168.
W-28 Outer Wing Upper Wing Planks Cracks have occurred in upper 56 Surface Nos. 2 to 4 wing planks 2, 3, and 4 in skate on each side angle area.
of inboard nacelles W-29 Outer Wing Upper Wing Planks Cracks have occurred in upper 30 Surface No. 1 thru wing planks No. 1 thru 5 at W.S. 346 5 at inboard W.S. 346.
side of outboard nacelles
AC 20-64 CHG 1 10/26/73 Appendix 6 7 8 9 10
RECOMMENDATIONS
METHOD FREQUENCY TYPE OR METHOD
OF OF OF PREVENTIVE INSP. INSPECTION REPAIR ACTION Visual Initial inspection within the next Per listed repair installations in Same as Column 9.
and Dye 400 hours time in service unless accordance with LAC Service Penetrant previously accomplished. Bulletin 88/SB-669A.
LAC Service Bulletin 88/SB-669A for detailed INSTALLATION PLANK instructions.
No. 841634 No. 1 & 2 Repeat inspections within 2500 841635 No. 1 fIt. hours or 2500 landings 841636 No. 3, 4,5 whichever comes first. 841642 No. 5&6 841865 MLG Drag Strut Area Visual, Eddy On aircraft having 20,000 flt. Repair in accordance with LAC Service Bulletin current hours or more inspect within 625 Service Bulletin 88/SB-670D, 88/SB-670D, fIt. hours. Repeat inspection at paragraph 2.E. paragraph 2.D.
1250 flt. hour intervals until Ref: Dwg.
preventive reinforcement or repair DRAWINGS 841717E which eliminates repeat 841624B inspections is installed. 841738A 841743B 841806B Visual Inspect within 700 flt. hours with Repair in accordance with LAC Same as Column 9 and Dye follow-up inspections at normal Service Bulletin 88/SB-675 and Penetrant structural maintenance inspection Dwg. Nos. 841758 and intervals. 841770A.
Visual Normal structural maintenance Preventive reinforcement - See | n s t a | I (accomplish inspection interval, but in no case column 10 for in s tallat i on reinforcements per in conjunc- shall interval exceed that required instructions LAC Service tion with by LAC Service Bulletin Bulletin 88/SB-649 88/SB-649. 88/SB-676.
inspection) Ref: Dwg.
841760
AC 20-64 CHG 1 Appendix 6 10/26/73
- 2 3 4 5 6 PAGE REF.
MAJOR FOR S/N NO. ASSEMBLY ITEM SERVICE HISTORY ILLUST. CODE W-30 Wing Center Section Upper and Corrosion damage has been 42 B.L. 65 L/R Lower Wing reported in upper and lower 57 Surfaces at wing surfaces at B.L. 65 where B.L. 65 center section joins outer Splice Area sections.
W-31 Outer Wing Front Upper cap Cracks have occurred in the 51 Spar W.S. 209 and spar spar web at the MLG rib attach web bolts thru the rib tee, spar web, upper spar cap and nacelle attach fitting.
W-32 Outer Wing and Upper and Corrosion damage around plank 43 Center Section B.L. Lower Wing splice fasteners has occurred on O to W.S. 584 Surfaces, both the upper and lower wing B.L. O to surfaces.
W.S. 584
AC 20-64 CHG 1 Appendix 6 10/26/73 Page 27 (and 28) 7 8 9 10
RECOMMENDATIONS
METHOD FREQUENCY TYPE OR METHOD
OF OF OF PREVENTIVE INSP. INSPECTION REPAIR ACTION Visual Inspect at next periodic with repeat inspections at every major Repair in accordance with LAC Periodic Service Bulletin 88/SB-678A. inspections and structural inspection interval. application of corrosion protection coatings.
Visual, Eddy On aircraft having 20,000 hours or Repair in accordance with LAC Service Bulletin current more inspect within 625 flt. Service Bulletin 88/SB-682B, 88/SB - 682B, hours. Repeat inspection at 1250 paragraph 2.F. paragraph 2.E.
fIt. hour intervals until preventive Ref: Drawing reinforcement or repair which DRAWINGS 841800C eliminates repeat inspections is 841802 installed. 841804C Visual Normal wing structural maintenance inspection interval, but in no case shall interval exceed Repair in accordance with LAC Periodic Service Bulletin 88/SB-685, inspections and paragraphs 2.C and 2.D. application of that required by LAC Service corrosion Bulletin 88/SB-620. DRAWINGS protection 841867 coatings.
841872
AC 20-64 CHG 1 Appendix 6 10/26/73 Page 29 FIGURE F-4. WING UPPER SURFACE Reference W-1, page 8 W-20, page 20
Appendix 6 AC 20-64 CHG 1 Page 30 10/26/73 88/SB-676 REINFORCEMENT FOR PLANK CRACKS 88:58-620 SPLICE SEALING
NACELLE PILLET DOUBLER
- 36 58-334 LEADING EDGE SCREW TIOHTNESS FIGURE F-5. WING UPPER SURFACE Reference W-1, page 8 W- 10, page 14 W-20, page 20 W-29, page 24
AC 20-64 CHG 1 Appendix 6 10/26/73 Page 31 NI
PLANK DEPRESSION Figure E-6. WING LOWER SURFACE Reference W-2, page &
AC 20-64 CHG 1 Appendix o 10/26/73 88/SB-628 - CENTROID RISER REMOVE PLASTIC FILLERS, RÉMOVE CORROSION, INSTALL METAL FILLERS 88: 58-587 1/4" DRAIN HOLE PLUGGED NEW HOLE DRILLED PLANK Figure F-7 WING LOWER SURFACE Reference W-3, page 8 W-12, page 16