Airworthiness directives › 2012-08-17
AD 2012-08-17 Airworthiness Directives; The Boeing Company Airplanes
Models named: 737-100, -200, -200C, -300, -400, -500 series. Read the applicability below — it usually turns on serial or part numbers too.
Applicability*9
(1) This AD applies to The Boeing Company Model 737-100, -200, -200C, -300, -400, and -500 series airplanes, certificated in any category, with an original airworthiness certificate or original export certificate of airworthiness issued before September 26, 2011, equipped with analog transient suppression devices (ATSDs) installed in accordance with Supplemental Type Certificate ST00146BO. http://rgl.faa.gov/Regulatory_and_Guidance_Library/rgstc.nsf/0/2399C433BB10CF1085256CCB00601A12?OpenDocument&Highlight=st00146bo (2) This AD requires revisions to certain operator maintenance documents to include new actions (e.g., inspections and/or Critical Design Configuration Control Limitations (CDCCLs). Compliance with these actions is required by 14 CFR 91.403(c). For airplanes that have been previously modified, altered, or repaired in the areas addressed by these inspections, the operator may not be able to accomplish the inspections described in the revisions. In this situation, to comply with 14 CFR 91.403(c), the operator must request approval for an alternative method of compliance (AMOC) according to paragraph (i) of this AD. The request should include a description of changes to the required actions that will ensure the continued operational safety of the airplane.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
Within 3 months after the effective date of this AD, revise the maintenance program to incorporate the limitations specified in Goodrich Principal Instructions for Continued Airworthiness Manual for the Analog Transient Suppression Device Installation Applicable to Boeing 737-100 through -500 Airplanes Supplemental Type Certificate—ST00146BO, Document T3044-0010-0101, Revision D, dated September 26, 2011. The initial compliance time for accomplishing each task is at the applicable time specified in Goodrich Principal Instructions for Continued Airworthiness Manual for the Analog Transient Suppression Device Installation Applicable to Boeing 737-100 through -500 Airplanes Supplemental Type Certificate—ST00146BO, Document T3044-0010-0101, Revision D, dated September 26, 2011, or within 18 months after the effective date of this AD, whichever occurs later. Note 1 to paragraph (g) of this AD: Components that have been identified as airworthy or installed on the affected airplanes before the revision of the maintenance program, as required by paragraph (g) of this AD, do not need to be reworked in accordance with the CDCCLs. However, once the maintenance program has been revised, paragraph (g) of this AD requires that future maintenance actions on these components must follow the CDCCLs.
Unsafe condition
This AD was prompted by multiple reports of corrosion on ATSDs. We are issuing this AD to detect and correct corrosion on ATSDs, which could result in the loss of high voltage transient protection (e.g., lightning protection) in the fuel tanks and consequent fuel tank explosion and loss of the airplane.
Affected ADs
None.
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