AD 76-14-02

Unsafe Condition

Various Modifications

Required Actions

Inspect for cracks and replace the fin pick-up front casting (P/N C2TF57) per DeHavilland Engineering Bulletin B-22. Repair rudder horn skin and rib flanges per Modification Bulletin T2/2061. Install gross weight placard per paragraph (a) unless stabilizer spar caps are altered per T2/2059. Inspect and replace tailwheel bolts per Technical News Sheet B-1. Reinforce float pick-up fitting with P/N C2-FS-3381 per Technical News Sheet B-3. Inspect and replace elevator mass balance screws per Technical News Sheet B-20. Reinforce rudder with P/N C2-TR-123 and inspect/replace rudder nose skin former per Technical News Sheet B-22. Replace main undercarriage tie bolt pins per Technical News Sheet B-25. Inspect and replace ski axle bolts per Federal Aircraft Works Drawing 10D2506. Install aft arm stop bracket per Federal Drawing 10D2506. Inspect ski axle pin bushings per Engineering Bulletin B-24 and lubricate or replace as needed.

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Compliance Time

Within the next 50 hours in service after 07/12/1976 (item 1), 25 hours in service (items 2,4,5,7,8), before next flight (items 6a,9a), every 50 hours thereafter (item 9), 100 hours between inspections (item 11b), and specific compliance as noted in each item.

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Affected Aircraft

de Havilland DHC-2 Mk.I, Mk.II, Mk.III (L-20A, YL-20, U-6A) serial numbers 1-1335 (except 1283,1318,1324), Mk.III Turbo-Beaver serials 3-5,7-29,31-35,37-39,41,43-54, float/amphibious Mk.III except 1662-TB36,1684-TB52,1686-TB54 and later, serials 1-9,11-13,15-50,52-61,63-64,66, and specific equipment configurations like Federal wheel-skis or combination wheel-skis.

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