67-09-03 BRITISH AIRCRAFT: Amdt. 39-372 Part 39 Federal Register March 21, 1967. Applies to Model BAC 1-11 400 Series Airplanes.
Compliance required as indicated.
To prevent interference between the flap jack screw and flap carriage assembly, accomplish the following:
(a) Within the next 500 hours' time in service after the effective date of this AD, unless already accomplished, and thereafter at intervals not to exceed 1,000 hours' time in service, measure the clearance between the head of the nut on flap screw jack P/N CH526-010 and the inside faces of the lower rollers on the aft flap carriages P/N AK09 A1263 and AK09 A1265 and AK09 A1266 at all 8 screw jack positions in accordance with BAC Alert Service Bulletin 27-A-PM2469 or later ARB-approved issue. If clearance is less than 0.025 inch, rework the nut stop head radius in accordance with BAC Service Bulletin No. 27-A-PM2469 or later ARB-approved issue.
(b) The repetitive inspections required in (a) may be discontinued if the airplanes are modified in accordance with BAC Service Bulletin 27-A-PM2469 paragraph (a) or (b) and PM2469 paragraph (c) and PM2469 paragraph (d) or (e) and PM2469 paragraph (f) or (g) or later ARB-approved issue.
This directive effective April 20, 1967.