79-14-03 LOCKHEED CALIFORNIA: Amendment 39-3511. Applies to Lockheed L-1011-385-1 series airplanes certificated in all categories.
Compliance required within the next 350 hours time in service, unless already accomplished.
To prevent uncontrolled pressure buildup in the hydraulic system return lines and to maintain full flight control capability, accomplish the following:
(a) Remove the hydraulic system return filter module inlet shutoff valve assemblies from the hydraulic system return filter modules per Lockheed Service Bulletin 093-29-069, dated June 27, 1979.
(b) Equivalent modifications may be approved by the Chief, Aircraft Engineering Division, FAA Western Region.
(c) Special flight permits may be issued in accordance with FAR 21.197 and 21.199 to operate the airplane to a base to perform the required modifications.
This amendment becomes effective July 16, 1978.