AD 75-09-16

75-09-16 LOCKHEED-CALIFORNIA COMPANY: Amendment 39-2192. Applies to Lockheed-California Company Model L-1011-385-1 series airplanes certificated in all categories with hydraulic dampers identified by Part Number 672470-101, -103, -105.

To prevent occurrence of dangerous flutter which could result in damage or loss of elevators, outboard ailerons and rudder control surfaces, and/or the associated lifting surface accomplish the following:

(a) Within 300 flight hours of the effective date of this AD unless previously accomplished within 200 hours flight time prior to the effective date of this AD, and at intervals not to exceed 500 flight hours thereafter, accomplish the inspections, servicing and replacement of dampers if required, on the elevators of aircraft with Serial Number 193X-1102 and subsequent, per Lockheed Alert Service Bulletin 093-27-A126, dated March 28, 1975 or later FAA-approved revisions.

(b) Within 500 flight hours of the effective date of this AD, and at intervals not to exceed 500 flight hours thereafter, accomplish the inspections, servicing and replacement of dampers as required on the outboard ailerons per Lockheed Alert Service Bulletin 093-27-A126, dated March 28, 1975, or later FAA-approved revisions.

(c) Within 1500 flight hours after the effective date of this AD, and at intervals not to exceed 1500 flight hours thereafter, accomplish the inspections, servicing and replacement of dampers as required on the rudder per Lockheed Alert Service Bulletin 093-27-A126, dated March 28, 1975, or later FAA-approved revisions.

(d) If damper replacement is required per instructions of above Lockheed Alert Service Bulletin 093-27-A126, dated March 28, 1975, or later FAA-approved revisions, replace the damper with (-105) damper configuration only, as defined in the Lockheed Service Bulletin 093-27-088, Revision No. 1 dated February 28, 1974, or later FAA-approved revisions.

(e) Equivalent inspections and replacements may be approved by the Chief, Aircraft Engineering Division, FAA Western Region.

(f) Airplanes may be flown to a base for the accomplishment of the inspections required by the AD, per FAR's 21.197 and 21.199.

This amendment becomes effective May 2, 1975.