Airworthiness Directive · Amendment 39-11933 · Lockheed Model L-1011-385 Series Airplanes
Lockheed Model L-1011-385 Series Airplanes
All Model L-1011-385 series airplanes, certificated in any category.
Note 1: This AD applies to each airplane identified in the preceding applicability provision, regardless of whether it has been modified, altered, or repaired in the area subject to the requirements of this AD. For airplanes that have been modified, altered, or repaired so that the performance of the requirements of this AD is affected, the owner/operator must request approval for an alternative method of compliance in accordance with paragraph (g) of this AD. The request should include an assessment of the effect of the modification, alteration, or repair on the unsafe condition addressed by this AD; and, if the unsafe condition has not been eliminated, the request should include specific proposed actions to address it.
This amendment adopts a new airworthiness directive (AD), applicable to all Lockheed Model L-1011-385 series airplanes, that requires repetitive inspections to detect corrosion or fatigue cracking of certain structural elements of the airplane; corrective action, if necessary; and incorporation of certain structural modifications. This amendment is prompted by new recommendations related to incidents of fatigue cracking and corrosion in transport category airplanes that are approaching or have exceeded their economic design goal. The actions specified by this AD are intended to prevent corrosion or fatigue cracking of certain structural elements, which could result in reduced structural integrity of the airplane.
To prevent corrosion or fatigue cracking of certain structural elements, which could result in reduced structural integrity of the airplane, accomplish the following:
(a) Except as provided by paragraph (b) of this AD, perform structural inspections to detect corrosion or fatigue cracking of certain structural elements of the airplane, in accordance with the applicable service bulletins listed under “Service Bulletin Number, Revision, and Date” in Tables I and II of Lockheed Service Bulletin 093-51-040, Revision 1, dated October 1, 1997, or Revision 2, dated October 21, 1999. Perform the initial inspections at the later of the times specified in paragraphs (a)(1) and (a)(2) of this AD. Thereafter, repeat each inspection at an interval not to exceed that specified in the applicable service bulletin listed in Revision 1 of Lockheed Service Bulletin 093-51-040.
(1) Prior to the threshold specified in the individual service bulletin listed in Table I or II of Lockheed Service Bulletin 093-51-040, Revision 1, as applicable.
(2) Within one repetitive interval after the effective date of this AD, as specified in the individual service bulletin listed in Table I or II of Lockheed Service Bulletin 093-51-040, Revision 1, as applicable; or within 14 months after the effective date of this AD for the service bulletins in Tables I and II that do not specify a repetitive interval; as applicable.
Note 2: Operators should note that paragraphs (a)(1) and (a)(2) of this AD reference only Revision 1 of Lockheed Service Bulletin 093-51-040. Certain new revisions of the individual service bulletins listed in Tables I and II of Lockheed Service Bulletin 093-51-040, Revision 2, have reduced the compliance times below those specified in the service bulletin revision levels listed in Lockheed Service Bulletin 093-51-040, Revision 1. While this AD allows accomplishment of the actions in this AD in accordance with either Lockheed Service Bulletin 093-51-040, Revision 1, or Revision 2, the applicable compliance thresholds and repetitive intervals are those listed in the individual service bulletins listed in Table I or II of Lockheed Service Bulletin 093-51-040, Revision 1.
Note 3: The inspections specified in Lockheed Service Bulletin 093-53-249, Revision 3, dated February 28, 1994, are included in the requirements of both AD 94-05-01, amendment 39-8839, and paragraph (a) of this AD. Inspections in accordance with Lockheed Service Bulletin 093-53-249, Revision 3, at the interval specified in Table I of Lockheed Service Bulletin 093-51-040, Revision 1, as required by this AD, are acceptable for compliance with the inspections in accordance with Lockheed Service Bulletin 093-53-249, Revision 3, required by AD 94-05-01.
(b) The following service bulletins listed in Table II of Lockheed Service Bulletin 093-51-040, Revision 1, dated October 1, 1997, and Revision 2, dated October 21, 1999, are excluded from the requirements of paragraph (a) of this AD.
(1) The structural inspections specified in Lockheed Service Bulletins 093-53-268, Revision 1, dated July 2, 1996, and 093-53-272, Revision 1, dated March 17, 1997, are not required by this AD. The inspections specified in these service bulletins are required by AD 99-08-20, amendment 39-11128.
(2) The structural inspections specified in Lockheed Service Bulletin 093-53-258, Revision 1, dated April 4, 1996, are not required by this AD. Inspections equivalent to those specified in that bulletin are required by AD 95-17-03, amendment 39-9332.
(3) The structural inspections specified in Lockheed Service Bulletin 093-57-203, Revision 5, dated April 22, 1996, are not required by this AD. Inspections equivalent to those specified in that bulletin are required by AD 98-10-14, amendment 39-10526.
(c) If any cracking is detected during any inspection required by paragraph (a) of this AD, prior to further flight, accomplish the actions specified in paragraph (c)(1), (c)(2), (c)(3), or (c)(4) of this AD.
(1) Repair in accordance with the applicable service bulletin referenced in Table I or II of Lockheed Service Bulletin 093-51-040, Revision 1, dated October 1, 1997, or Revision 2, dated October 21, 1999.
(2) Repair in accordance with the applicable section of the Lockheed L-1011 Structural Repair Manual.
(3) Accomplish the terminating modification in accordance with the applicable service bulletin referenced in Table I or II of Lockheed Service Bulletin 093-51-040, Revision 1, dated October 1, 1997, or Revision 2, dated October 21, 1999.
(4) Repair in accordance with a method approved by the Manager, Atlanta Aircraft Certification Office (ACO), FAA.
(d) Except as provided by paragraph (e) of this AD, install the terminating modification referenced in each service bulletin listed in Table II of Lockheed Service Bulletin 093-51-040, Revision 1, dated October 1, 1997, or Revision 2, dated October 21, 1999; in accordance with the applicable service bulletin listed under “Service Bulletin Number, Revision, and Date” in Table II of Lockheed Service Bulletin 093-51-040, Revision 1 or Revision 2. Except as provided by paragraph (f) of this AD, install each modification at the later of the times specified in paragraphs (d)(1) and (d)(2) of this AD. Such installation constitutes terminating action for the applicable structural inspection required by paragraph (a) of this AD.
(1) Prior to the threshold specified in the applicable service bulletin listed in Table II of Lockheed Service Bulletin 093-51-040, Revision 1 or Revision 2.
(2) Within 5 years or 5,000 flight cycles after the effective date of this AD, whichever occurs first.
Note 4: Installation of the terminating modifications specified in Lockheed Service Bulletin 093-53-268, Revision 1, dated July 2, 1996, and Lockheed Service Bulletin 093-53-272, dated November 12, 1996, does not constitute terminating action for the repetitive inspection requirements of AD 99-08-20, amendment 39-11128.
(e) Overhaul of the main landing gear actuator in accordance with Lockheed Service Bulletin 093-32-238, Revision 3, dated April 11, 1996, as listed in Table II of Lockheed Service Bulletin 093-51-040, Revision 1, dated October 1, 1997, is not required by paragraph (d) of this AD.
(f) At the later of the times specified in paragraphs (f)(1) and (f)(2) of this AD: Install the terminating modification listed in Lockheed Service Bulletin 093-57-215, as referenced in Table II of Lockheed Service Bulletin 093-51-040, Revision 1, dated October 1, 1997, or Revision 2, dated October 21, 1999. Such installation constitutes terminating action for the inspections required by AD 98-10-14, amendment 39-10526.
(1) Prior to the threshold specified in Lockheed Service Bulletin 093-57-203, Revision 5, dated April 22, 1996.
(2) Within 2 years or 2,000 flight cycles after the effective date of this AD, whichever occurs first.
