Airworthiness directives › 2016-11-07
AD 2016-11-07 Airworthiness Directives; The Boeing Company Airplanes
Models named: 777-200, -300 series. Read the applicability below — it usually turns on serial or part numbers too.
Applicability*9
This AD applies to The Boeing Company Model 777-200 and -300 series airplanes, certificated in any category, equipped with Pratt and Whitney engines, as identified in Boeing Special Attention Service Bulletin 777-71-0055, Revision 1, dated April 15, 2015.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
Within 4,000 flight cycles or 750 days after the effective date of this AD, whichever occurs later: Accomplish the actions specified in paragraphs (g)(1) through (g)(4) of this AD on the left and right struts, in accordance with the Accomplishment Instructions of Boeing Special Attention Service Bulletin 777-71-0055, Revision 1, dated April 15, 2015; and accomplish the revision specified in paragraph (g)(5) of this AD. (1) Disconnect and remove the forward strut drain lines. (2) Clean the left system disconnect, the strut forward lower spar, and the forward fireseal pan drain lines. (3) Install new forward strut drain lines and insulation blankets. (4) Do a leak check of the forward strut drain lines for any leak, and repair if any leak is found. (5) Revise the maintenance or inspection program, as applicable, to incorporate Airworthiness Limitation 54-AWL-01, “Forward Strut Drain Line” as specified in Section D.4, Pratt and Whitney Forward Strut Drain Line, dated March 2014, of the Boeing 777 Maintenance Planning Data (MPD) Document Section 9, Airworthiness Limitations (AWLs) and Certification Maintenance Requirements (CMRs), D622W001-9, dated October 2014. The initial compliance time for Airworthiness Limitation 54-AWL-01 is within 2,000 flight cycles or 1,500 days, whichever occurs first, after doing the actions specified in paragraphs (g)(1) through (g)(4) of this AD.
Unsafe condition
This AD was prompted by reports of blocked drain lines at the engine forward strut that caused flammable fluid to accumulate in a flammable leakage zone. We are issuing this AD to prevent blockage of forward strut drain lines. This condition could cause flammable fluids to collect in the forward strut area and potentially cause an uncontrolled fire or cause failure of engine attachment structure and consequent airplane loss.
Affected ADs
This AD affects the ADs specified in paragraphs (b)(1) and (b)(2) of this AD. (1) AD 2014-20-10, Amendment 39-17983 (79 FR 60331, October 7, 2014) (“AD 2014-20-10”). (2) AD 2015-17-13, Amendment 39-18246 (80 FR 52948, September 2, 2015) (“AD 2015-17-13”).
Read the original on the Federal Register →
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The directive text above is reproduced from the Federal Register, a work of the United States government and in the public domain. The separation into applicability, compliance and required actions is TrackAD's.*1