Document ID: chunk:federal_register_of_legislation:F2012L00012:body:0:p2
Version: federal_register_of_legislation:F2012L00012
Segment Type: other
Provision Reference: 
Character Range: 2889–6038

Revision 1.
             Inspections and/or rectifications accomplished before the effective date of the original issue of this Directive in accordance with the Accomplishment Instructions of ASB 737-24A1148, dated 6 December 2001, are acceptable for compliance with this equivalent requirements of this Directive.  Where equivalent inspections were required by either AD/B737/188 Amdt 1 or the original issue of this Directive, the interval for repetitive inspection in this Amendment commences when the last inspection was originally accomplished.
             Later revisions of the above SB, approved by the United States Federal Aviation Administration (FAA) as an Alternate Method of Compliance (AMOC) to FAA AD 2005-18-23, are considered acceptable for compliance with the equivalent requirements of this Directive.
             FAA AMOC Letter 130S-09-9, issued to permit the use of a renamed corrosion inhibiting fluid, is considered acceptable for compliance with the equivalent requirements of this Directive.
             Note 2:  FAA AD 2005-18-23 Amdt 39-14264 and FAA AMOC Letter 130S-05-490 dated 20 October 2005 refer.
Compliance:  For Requirement 1 - Within 12 months after the effective date of this Amendment and thereafter at intervals not exceeding 24 months.
             For Requirement 2.a. - At intervals not exceeding 24 months after the initial determination.
             For Requirement 2.b. - Within 90 days after the Requirement 1.a. determination is made and thereafter at intervals not exceeding 24 months.
             For Requirement 3 - Before further flight after the Requirement 1.b. or 2.b. inspection, as applicable.
             This Amendment becomes effective on 9 January 2012.
Background:  The original issue of this Directive superseded AD/B737/188 Amdt 1 (FAA AD 2002-16-03) which was cancelled.  AD/B737/188 Amdt 1 required either determining exposure to runway de-icing fluids containing potassium formate, or performing inspections of certain electrical connectors in the wheel well of the main landing gear (MLG) for corrosion and follow-on actions.

   The original issue of this Directive was issued to prevent corrosion and subsequent moisture ingress into the electrical connectors, which could result in an electrical short and consequent incorrect functioning of critical aeroplane systems essential to safe flight and landing of the aeroplane, including fire warning systems.
   The first Amendment followed clarification from the FAA that the inspection in paragraph (f) (2) of FAA AD 2005-18-23 (the AD on which this Directive is based) was indeed meant to be repetitive.  The Amendment also introduced the option to either make a determination regarding exposure to de-icing fluids or the carry out an inspection, again reflecting the requirements of the FAA AD.
   The second Amendment was issued to correct a typographical error to the AMOC reference number.
   The third Amendment incorporates FAA AMOC 130S-09-9 which allows a renamed inhibitor product to be used.  Following the acquisition of the original manufacturer, the new owners renamed the product range as a branding