AC 20-64 CHG 1 Appendix 6 10/26/73 Page 9 7 8 9 10
RECOMMENDATIONS
METHOD FREQUENCY TYPE OR METHOD
OF OF OF PREVENTIVE INSP. INSPECTION REPAIR ACTION Visual Inspect at 50 flight hours intervals Remove existing screws and Accomplish and retighten all screws each 300 replace with new type fasteners 88/SB-334.
hours until LAC 88/SB-334 is per 88/SB-334.
incorporated.
Visual Inspect within next 300 hour interval. If depressions exceed limits reinspect each 100 hours until corrective action is taken.
Replace H-clips per instructions Same as Column 9.
of LAC Service Bulletin 88/SB-564.
Externa I Visual Repeat inspections at 1000 hour intervals until permanent repair is incorporated. Interim repairs have special inspection requirements.
Visual Inspect within 850 hours and reinspect at 5000 hour intervals.
(1) Preventive/temporary Same as Column 9, repair may be effected by Item (2).
installing 5/16 Hi-Lok fasteners in drain holes per 88/SB-587C with continued 1000 hr. repeat inspections.
(2) Permanent repair/reinforcement can be made by incorporating either SED/63-9015-101 or SED/63-9015-135 shown on Dwg. SED/63-9015B.
Replace and/or tighten bolts Same as Column 9.
and rework bolt holes per LAC 88/SB-591A.
Appendix 6 AC 20-64 CHG 1 Page 10 10/26/73 2 3 4 5 6 PAGE REF.
MAJOR FOR S/N NO. ASSEMBLY ITEM SERVICE HISTORY ILLUST. CODE W-5 Outer Wing Lower Wing Plank Cracks have occurred in the 34 Surface, W.S. No. 7 wing plank surface and plank 35 179-197 riser located under the main landing gear actuating cylinder attach fitting angles, P/N 802699.
W-6 Outer Wing Lower support Fatigue cracks have occurred at 35 Surface, W.S. 187 Fitting, MLG the aft end of the MLG actuator 36 Actuator support fittings in the radius P/N 800618-1 of the vertical legs.
P/N 800618-2 P/N 800618-3 P/N 800618-4
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 Within next 2500 flight hours on A/C which have 88/SB-538 Requires incorporated. Otherwise, inspect removal of at 88/SB-538 incorporation, or 801266-1 within next 2500 fIt. hours, door (Dry whichever occurs first.
Repair wing plank skin and Same as Column 9.
riser cracks per Electra Structural Repair Manual, Section 57-2-1, Fig. 3, Sheets 41 thru 44, LAC Dwg. 841880, and LAC Bay A/C) 88/SB-593C. Repair & 800917 Repeat inspections at 2500 flt. out-of-round holes per LAC Door (Wet hour intervals are recommended. Service Bulletin 88/SB-593C.
Bay A/C) Visual, Dye Dye penetrant inspect original Penetrant 800618-3 & -4 fittings within 215 flight hours, Repeat at 425 flt. hrs. Visual dye penetrant inspect aft 4 in. of fittings at each 850 flt. hrs.
Visual inspect reworked fittings (radius on aft edge) at each 850 flt. hrs. and dye penetrant inspect at each 1700 flt. hrs.
No repeat inspections for new 841275-101, -102 fittings.
Install new 800618-3 or Install new fittings, 841275-101 (LH) and P/N 841275.
800618-4 or 841275-102 (RH) support fittings to replace damaged parts per LAC 88/SB-599A.
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