Airworthiness Directive · Amendment 39-17382 · Equipment/furnishings
The Boeing Company Airplanes
This AD applies to The Boeing Company Model 777-200, -200LR, -300, -300ER, and 777F series airplanes, certificated in any category, as identified in Boeing Special Attention Service Bulletin 777-25-0507, dated June 30, 2011.
We are adopting a new airworthiness directive (AD) for certain The Boeing Company Model 777 airplanes. This AD was prompted by reports that escape slides/rafts did not deploy due to galvanic corrosion of the door-mounted slide/raft packboard release mechanisms. This AD requires doing a general visual inspection of the housing assembly of the packboard release mechanism to determine if its surface treatment has been sealed, and if the surface of the housing assembly is unsealed, replacing the housing assembly with a new or serviceable housing assembly. We are issuing this AD to detect and correct corrosion of the packboard release mechanisms, which could interfere with escape slide/raft deployment, prohibit doors from opening in the armed mode, and cause consequent delay and injury during evacuation of passengers and crew from the cabin in the event of an emergency.
Within 42 months after the effective date of this AD, at the applicable passenger/crew entry doors identified in Boeing Special Attention Service Bulletin 777-25-0507, dated June 30, 2011, that have not been modified as specified in Air Cruisers Service Bulletin 777 107-25-30, dated September 30, 2010 (which is not incorporated by reference in this AD): Do a general visual inspection of the housing assembly of the packboard release mechanism to determine if its surface treatment has been sealed; and if unsealed, before further flight, replace the housing assembly with a new or serviceable housing assembly; in accordance with the Accomplishment Instructions of Boeing Special Attention Service Bulletin 777-25-0507, dated June 30, 2011.
Note 1 to paragraph (g) of this AD: Boeing Special Attention Service Bulletin 777-25-0507, dated June 30, 2011, refers to Air Cruisers Service Bulletin 777 107-25-30, dated September 30, 2010 (which is not incorporated by reference in this AD), as an additional source of guidance for inspecting and installing a new housing assembly of the door-mounted slide/raft packboard release mechanism.
Verifying the housing assembly has been replaced with a new or serviceable housing assembly by inspecting for a stencil to verify that there is a stencil marked “Inspected and/or Mod per S.B. 777 107-25-30” on the girt assembly and upper lacing cover on the housing assembly of the packboard release mechanism; or by reviewing technical or maintenance records, if it can be conclusively determined that the modification specified in Air Cruisers Service Bulletin 777 107-25-30, dated September 30, 2010, (which is not incorporated by reference in this AD), as specified in Boeing Special Attention Service Bulletin 777-25-0507, dated June 30, 2011, has been accomplished; terminates the requirements of paragraph (g) of this AD.
For the purposes of this AD, a general visual inspection is: A visual examination of an interior or exterior area, installation, or assembly to detect obvious damage, failure, or irregularity. This level of inspection is made from within touching distance unless otherwise specified. A mirror may be necessary to ensure visual access to all surfaces in the inspection area. This level of inspection is made under normally available lighting conditions such as daylight, hangar lighting, flashlight, or droplight and may require removal or opening of access panels or doors. Stands, ladders, or platforms may be required to gain proximity to the area being checked.
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
