77-15-07 BRITISH AIRCRAFT CORPORATION: Amendment 39-2980. Applies to Viscount Model 744, 745D, and 810 airplanes with aileron control rods, P/N 60903, sheets 185 and 187 and P/N 70103, sheets 329, 445, 447, 449, 451, 453, 455, 457, and 459, certificated in all categories.
Compliance is required as indicated, unless already accomplished.
To detect corrosion of the aileron control rods and prevent possible aileron failure, accomplish the following:
(a) Within the next 30 days after the effective date of this AD or 18 months from the date of the last overhaul of the specified aileron control rods, whichever occurs later, and thereafter at intervals not to exceed 6 months from the last inspection, inspect the aileron control rods for corrosion in accordance with paragraph 2.2 "Accomplishment Instructions" section of issue 2, dated June 2, 1976, British Aircraft Corporation Alert Preliminary Technical Leaflets No. 305 for 700 series airplanes and NO. 174 for 810 series airplanes, or an FAA-approved equivalent.
(b) If, during an inspection required by paragraph (a) of this AD, corrosion is found, before further flight, replace the corroded parts with new parts of the same part number.
(c) If, during an inspection required by paragraph (a) of this AD, no corrosion is found, rework the aileron control rods in accordance with paragraph 2.2.1 "Accomplishment Instructions" section of issue 2, dated June 2, 1976, British Aircraft Corporation Alert Preliminary Technical Leaflets No. 305 for 700 series airplanes and No. 174 for 810 series airplanes, or an FAA-approved equivalent.
(d) The repetitive inspections required by paragraph (a) of this AD may be discontinued upon compliance with paragraph (e) of this AD.
(e) Within the next 2 years after the effective date of this AD or at the next aileron control rod overhaul, whichever occurs sooner, remove the affected aileron control rods, disassemble the external sleeves where fitted, and conducta radiographic inspection of the aileron control rod tubes and a visual inspection of the external sleeves in accordance with paragraph 2.4 "Accomplishment Instructions" and paragraph entitled "Radiographic Technique" of issue 2, dated June 2, 1976, British Aircraft Corporation Alert Preliminary Technical Leaflets No. 305 for 700 series airplanes and NO. 174 for 810 series airplanes, or an FAA-approved equivalent.
(f) If, during the inspection required by paragraph (e) of this AD, corrosion is found, before further flight, replace the corroded parts with new parts of the same part number.
(g) If, during the inspection required by paragraph (e) of this AD, no corrosion is found, rework the aileron control rods in accordance with paragraph 2.4 "Accomplishment Instructions" section of issue 2, dated June 2, 1976, British Aircraft Corporation Alert Preliminary Technical Leaflets No. 305 for 700 series airplanes and No. 174 for 810 series airplanes, or an FAA-approved equivalent.This amendment becomes effective August 22, 1977.