Airworthiness Directive · Amendment 39-19874 · Engine exhaust
The Boeing Company Airplanes
This AD applies to The Boeing Company Model 777-200 series airplanes, certificated in any category, equipped with General Electric Company (GE) GE90-76B, -85B, -90B, or -94B engines.
The FAA is superseding Airworthiness Directive (AD) 2010-26- 01, which applied to certain The Boeing Company Model 777-200 series airplanes. AD 2010-26-01 required installing a new insulation blanket on the latch beam firewall of each thrust reverser (T/R) half. This AD requires retaining the requirements of 2010-26-01. This AD also adds airplanes to the applicability. For those airplanes, this AD requires an inspection to determine if the installed T/R has an affected part number and, if an affected part number is found, installation of a new insulation blanket. This AD was prompted by a report of an in-flight shutdown due to an engine fire indication and a determination that additional airplanes are affected. The FAA is issuing this AD to address the unsafe condition on these products.
This paragraph restates the requirements of paragraph (g) of AD 2010-26-01, with revised service information. For airplanes identified in Boeing Alert Service Bulletin 777-78A0066, Revision 2, dated April 8, 2010: Within 60 months or 4,500 flight cycles after January 20, 2011 (the effective date of AD 2010-26-01), whichever is first, install a new insulation blanket on the latch beam firewall of each T/R half by doing all the applicable actions specified in the Accomplishment Instructions of Boeing Service Bulletin 777-78A0066, Revision 3, dated April 28, 2011.
For airplanes not identified in paragraph (g) of this AD: Within 60 months or 4,500 flight cycles after the effective date of this AD, whichever is first, inspect to determine if the installed T/R has any affected part number as identified in paragraphs (h)(1) through (5) of this AD. If an affected T/R is found or if it cannot be determined which T/R is installed, within 60 months or 4,500 flight cycles after the effective date of this AD, whichever is first, install a new insulation blanket on the latch beam firewall of each T/R half by doing all the applicable actions specified in the Accomplishment Instructions of Boeing Service Bulletin 777-78A0066, Revision 3, dated April 28, 2011, except as specified in paragraph (i) of this AD. A review of airplane maintenance records is acceptable in lieu of this inspection if it can be conclusively determined from that review that the installed T/R is not an affected T/R. A review of airplane maintenance records is also acceptable in lieu of this inspection if it can be conclusively determined from that review that an affected T/R is installed and the actions specified in Boeing Service Bulletin 777-78A0066, Revision 3, dated April 28, 2011, have already been done on that T/R.
(1) 315W1001-XX (all—where “XX” is any combination of numbers and letters that follow the dash).
(2) 315W1295-1 through 315W1295-222 inclusive.
(3) 315W1295-5001 through 315W1295-5222 inclusive.
(4) 315W1295-5501 through 315W1295-5722 inclusive.
(5) 315W1295-6101 through 315W1295-6322 inclusive.
(1) Boeing Service Bulletin 777-78A0066, Revision 3, dated April 28, 2011, defines Group 1 as “all 777-200 airplanes with GE90 engines through line number 413 with a forward insulation blanket”; however, for paragraph (h) of this AD, Group 1 is defined as “all 777-200 airplanes with GE90 engines with a forward insulation blanket.”
(2) Boeing Service Bulletin 777-78A0066, Revision 3, dated April 28, 2011, defines Group 2 as “all 777-200 airplanes with GE90 engines through line number 413 without a forward insulation blanket”; however, for paragraph (h) of this AD, Group 2 is defined as “all 777-200 airplanes with GE90 engines without a forward insulation blanket.”
(3) Boeing Service Bulletin 777-78A0066, Revision 3, dated April 28, 2011, defines Group 2 Configuration 1 as “all 777-200 airplanes with GE90 engines through line number 413 without a forward insulation blanket and without the fitting assembly at the aft insulation blanket location”; however, for paragraph (h) of this AD, Group 2 Configuration 1 is defined as “all 777-200 airplanes with GE90 engines without a forward insulation blanket and without the fitting assembly at the aft insulation blanket location.”
(4) Boeing Service Bulletin 777-78A0066, Revision 3, dated April 28, 2011, defines Group 2 Configuration 2 as “all 777-200 airplanes with GE90 engines through line number 413 without a forward insulation blanket and with the fitting assembly at the aft insulation blanket location”; however, for paragraph (h) of this AD, Group 2 Configuration 2 is defined as “all 777-200 airplanes with GE90 engines without a forward insulation blanket and with the fitting assembly at the aft insulation blanket location.”
The aircraft, engines and makers this AD names, by the model designations in its text. A model listed here may still be outside the AD's serial ranges.
Aircraft
