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
AC 20-64 CHG 1 Appendix 6 10/26/73 Page 33 88/58-591 INSPECTION OF FLAP TRACK ATTACHMENTS Figure F-8. WING EXTERNAL STRUCTURE Reference W-4, page 8
Appendix 6 AC 20-64 CHG 1 Page 34 10/26/73 WING INTERNAL STRUCTURE 88/5B 630 TYPICAL FILLET AREAS TO BE INSPECTED AND REWORKED W-5, page 10 W-13, page 16 W-17, page 18 MLO RIB-W.S. 167 FIGURE F-9. RIB WS137 Reference 88/SB 634 INSPECT FOR CRACKS AT ATTACHMENTS TO PLANKS 88/58-593 INTERCOSTAL ABOVE P/N 800618 ACTUATOR BITTING ON PLANK 47
UPPER SURFACE
AC 20-64 CHG 1 Appendix 6 10/26/73 Page 35 WING FLAP FLAP DEL ALA PLANK #7 (REF) INBOARD NACELLE 88/58-593 INSPECT MLG FITTING INTERCOSTAL LOCATED INSIDE BOX BEAM ABOVE FITTING 88/SB-509 INSPECT MLG ACTUATOR CYLINDER ATTACH FITTING 88 SB-669 INSPECTION LOWER SURFACE BETWEEN WS157 AND WS219.
FIGURE F-10.WING LOWER SURFACE Reference W-5, page 10 W-6, page 10 W-26, page 24
Appendix 6 AC 20-64 CHG 1 Page 36 10/26/73 NISD STRU © EDGE 88/S8-655 INSPECT FOR CRACKS N SKIN AND RIBS FIGURE F-11. WING UPPER SURFACE Reference W-6, page 10 W- 24, page 22