AC 20-64 CHG 1 Appendix 6 Page 12 10/26/73 2 3 4 5 6 PAGE REF.
MAJOR FOR S/N NO. ASSEMBLY ITEM SERVICE HISTORY ILLUST. CODE W-7 Outer Wing Upper Wing Planks Cracks up to three inches in 37 Surface under length have occurred under the nacelle inboard and outboard skate skate angles angles of the inboard nacelle.
W-8 Outer Wing Upper Fuel Tank Corrosion has been reported on 38 and Lower Surfaces Access lower wing plank access door Door Lands lands due to condensation.
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 (External, Initial external inspection at 450 Internal) flt. hrs. with repeat at next 450.
X-Ray Initial internal inspection at 900 fIt. hrs. with repeat at 3000 hr.
intervals. Discontinue inspections after 6000 hrs. if no cracks found.
(1) Repair cracks in planks per Same as Column 9, Electra Structural Repair I tem (2).
Manual, Section 57-2-1.
(2) Install skate angle attachment reinforcement at inbd. and outbd. nacelles per LAC Alert Service Bulletin 88/SB-600A (Ref: LAC Dwg.
841481).
Visual Within next 850 flt. hrs.
Reinspect at each overhaul period.
Remove corrosion per Electra Add protection per Structural Repair Manual 88/SB-606. Refer Section 51-2-14 and add to 88/SB-620G for protective coating per LAC access door gap Service Bulletin 88/SB-606. sealing Repair per LAC Drawing instructions.
841295 when damage exceeds .010 inch depth.
NOTE: Contact LAC for repair of damage which exceeds allowable limits of Dwg.
841295.
(Refer to 88/SB-620G for access door gap sealing instructions.)
Appendix 6 Page 14 AC 20-64 CHG 1 10/26/73 2 3 4 5 6 PAGE REF.
MAJOR FOR S/N NO. ASSEMBLY ITEM SERVICE HISTORY ILLUST. CODE W-9 Outer Wing Upper Wing Planks Cracks have occurred in the 39 Surface, W.S. 167 & at MLG Rib wing upper surface in the area 40 W.S. 209 Forgings of the MLG rib forgings.
W-10 Center Section Wing, Wing Planks Corrosion and cracks have 30 Outer Wing Upper and occurred at various locations in 37 Lower the upper and lower wing plank 38 Surfaces splices. 41 42 43 W-11 Outer Wing Lower Wing Plank Cracks have occurred in the 44 Surface, W.S. 167 & Nos. 3,4,5, lower wing No. 5 plank of the W.S. 209 & 6. LH inboard MLG fulcrum fitting at the No. 4 and No. 5 splice; also, at a fastener hole in plank No. 6 at approx. W.S.
211.
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 Visua Initial inspection Install 0.063 inch thick Same as Column 9.
and dy e within 700 landings doublers under existing penetrant. with repeat inspections at 1400 external doublers and install Ultrasonic landing intervals. No repeat angle stiffeners on the wing and X-Ray inspections required after internal surface at the Plank may be used incorporation of reinforcements No. 3 & No. 4 splice on A/C in local described in LAC Service Bulletin S/N 1001, 1002, 1004 thru areas. 88/SB-619. 1144, and 2001 thru 2019.
Install new external doublers only on A/C S/N 1145 thru 1148 and 2020 thru 2022.
Accomplish rework per LAC Service Bulletin 88/SB-619A.
Ref. LAC Drawings 841314C, 841315C, 841345, 841346, SED/64-9010, SED/64-9011.
V is u al, Repeat inspection intervals As specified in LAC Service Accomplish Ultrasonic based on action taken. Bulletin 88/SB-620G. Service Bulletin 88/SB-620G.
Dy e Initial inspection As specified in LAC Service Same as Column 9.
Penetrant, within 700 landings Bulletin 88/SB-625D.
Ultrasonic with repeat inspections at 1400 landing intervals. Repetitive Seal plank splices under repairs inspections may be discontinued per 88/SB-620G.
after incorporation of LAC Service Bulletin 88/SB-625 reinforcements.
Appendix 6 AC 20-64 CHG 1 Page 16 10/26/73 2 3 4 5 PAGE REF.
MAJOR FOR S/N NO. ASSEMBLY ITEM SERVICE HISTORY ILLUST. CODE W-12 Outer Wing Upper & Centroid Corrosion has occurred in the 32 Lower Surfaces Riser centroid riser cavities under the 45 W.S. 155 Cavities plastic fillers.
W.S. 221 W-13 Outer Wing Upper MLG Rib Cracks have occurred in web 34 Surface, W.S. 167 & Web Fillets fillets at rib truss and upper 46 W.S. 209 chord member junctures.
W-14 Outer Wing Lower Wing Plank Cracks have occurred at the 47 Surface Nos. 2,3, 4. fastener holes around the fuel 48 W.S. 128 sight gage and fuel overflow W.S. 193 openings on LH and RH lower W.S. 266 wing planks.
W-15 Outer Wing Upper Wing Plank Cracks have occurred at screw 39 Surface No. 2 holes in the No. 2 plank at the W.S. 212-230 plank No. 1 and No. 2 splice between W.S. 212 and 230.
AC 20-64 CHG 1 10/26/73 Appendix 6 Page I/ 7 8 9 10
RECOMMENDATIONS
METHOD FREQUENCY TYPE OR METHOD
OF OF OF PREVENTIVE INSP. INSPECTION REPAIR ACTION Visual At normal maintenance inspection Remove plastic fillers and Install aluminum interval. metallic washers, and remove fillers per any corrosion present in 88/SB-628B.
accordance with instructions contained in LAC Drawing 841444. Repair per Dwg.
841443, if required.
Install new aluminum fillers as shown on Dwg. 841332, and washers, P/N 841326-101, per LAC Service Bulletin 88/SB-628B.
Dye Accomplish within next 1000 Inspect, rework and repair per Per LAC Dwg.
P e netrant landings. LAC Service Bulletin 841374 88/SB-630 and Dwg. 841374. : Ref: 88/SB-630.
Visual, Dye Initially at 500 hrs.
Penetrant Repeat at 1000 hours.
No repeat after incorporation of preventive repair.
Type A repair where cracks Per LAC Dwg.
have not entered risers. Type B 8413718 repairs where cracks extend Ref: 88/SB-631B.
thru risers. Ref: LAC Dwg.
841336C and 88/SB-631B.
Visual, Dye Initially at 500 hrs. Install appropriate doubler per Install 841364-109 Penetrant Repeat at 1000 hours. LAC Dwg. 841364A. Ref: LAC spacer and Hi-Lok No repeat after incor- 88/SB-632A. fasteners per LAC poration of preventive 88/SB-632A.
repair.
Appendix 6 AC 20-64 CHG 1 Page 18 10/26/73 2 3 4 5 6 PAGE REF.
MAJOR FOR S/N NO. ASSEMBLY ITEM SERVICE HISTORY ILLUST. CODE W-16 Wing Joint-Center Attachment Fatigue cracks have occurred, 49 Sec. to Outer Wing Fittings P/N emanating from the barrel-nut 807352 and access holes of the outer wing P/N 807354 front cap fittings at B.L. 65.
W-17 Outer Wing-Trailing Upper Cracks have occurred in the 34 Edge Upper Surtace Plank Nos. trailing edge of Wing Planks W.S. 143 6,7,88. Nos. 6, 7, & 8 at W.S. 143, left and right upper surfaces, and in backup fitting, P/N 803900, for the flap track attachment.
W- 18 Outer Wing Lower Wing-to- Cracks have occurred in the 50 Surface Nacelle attachment plate which is 51 W.S. 167 & Attachment located in the inboard nacelle W.S. 209 Plate, on the lower front beam of the P/N 810053-1 left wing assembly.
P/N810053-3 P/N810054-1 P/N810054-3 W-19 Outer Wing Upper M a i n Cracks have occurred in the 52 and Lower Surface Landing vertical legs of the MLG rib W.S. 167 & Gear Rib caps.
W.S. 209 Caps
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, Dye Initial inspection Penetrant within 1100 flight hours for cracks in lower fittings.
Within next 3000 flt. hours inspect for cracks and burrs in both upper and lower fittings.
Deburr all fittings within the 4100 fIt. hours limit.
(1) Replace any cracked Same as Column 9, fittings before further flight, Item (2).
with new fittings deburred per LAC 88/SB-633B.
(2) Deburr all uncracked fittings having burrs, per LAC 88/SB-633B.
Visual Initial inspection within 500 Repair cracks per LAC Dwg. Incorporate landings. No special repeat 841390, or the Electra preventive inspection required after Structural Repair Manual, in reintorcement per incorporation of repair or accordance with LAC Service LAC Dwg.
preventive reinforcement. Bulletin 88/SB-634B. 841505. Ref:
88/SB-634B.
Visual Inspect within next 700 landings. Replace attachment plate in Install new Repeat inspections every 2000 accordance with LAC attachment plates, landings until plate is replaced. 88/SB-638B. P/N 841656-101 or 841438-101.
Internal Inspection recommended within Visual 700 landings and repeat inspections at overhaul periods.
Interim action requires inspection at each 120 landings for maximum of 500 landings.
Interim action consists of stop Accomplish intent drilling crack in accordance of repair per with LAC Service Bulletin 88/SB-639, 88/SB-639 and Electra drawings Structural Repair Manual. SED/66-9101 and SED/66-9107.
Accomplish repair in accordance with 88/SB-639.
Ref: Dwgs. SED/66-9101 and SED/66-9107.
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.