Airworthiness Directive · Amendment 39-16921 · Equipment and furnishings
The Boeing Company Airplanes
This AD applies to The Boeing Company Model 757-200, -200CB, and -300 series airplanes; certificated in any category; as identified in Boeing Special Attention Service Bulletin 757-25-0298, Revision 1, dated April 12, 2011; with off-wing escape slide systems installed.
We are adopting a new airworthiness directive (AD) for certain The Boeing Company Model 757-200, -200CB, and -300 series airplanes with off-wing escape slide systems installed. This AD was prompted by reports of in-flight loss of the off-wing escape slide. This AD requires modifying the door latch fittings and witness mark placards of the off-wing escape slide systems; and for certain airplanes, replacing the bearings and lockbase retainer in the door latch assembly, relocating and adjusting the sensor target and the sensor proximity switch, and testing to ensure positive door locking and corrective action if necessary. For certain airplanes, this AD would also require installing a bumper assembly and placards. We are issuing this AD to prevent the in-flight loss of the off-wing escape slide, which could result in the unavailability of the escape slide during an emergency evacuation. Additionally, the departed slide could cause damage to the fuselage, wing, flaps, or stabilizer, which could degrade flight control.
Within 60 months after the effective date of this AD, modify the door latch fittings and witness mark placards of the left and right off-wing escape slide systems, in accordance with the Accomplishment Instructions of Boeing Special Attention Service Bulletin 757-25-0298, Revision 1, dated April 12, 2011.
Concurrently with or before accomplishing the actions specified in paragraph (g) of this AD, do the applicable actions specified in paragraphs (h)(1), (h)(2), (h)(3), and (h)(4) of this AD.
(1) For airplanes that have not been modified by Boeing Service Bulletin 757-25-0182, dated October 10, 1996; or Revision 1, dated June 12, 1997; as of the effective date of this AD: Modify the door latch system of the left and right off-wing emergency evacuation slide systems, in accordance with the Accomplishment Instructions of Boeing Service Bulletin 757-25-0182, Revision 2, dated January 11, 2001.
(2) For airplanes that have been modified by Boeing Service Bulletin 757-25-0182, dated October 10, 1996; or Revision 1, dated June 12, 1997; as of the effective date of this AD: Do a test to verify that the modified compartment door sensor provides an accurate indication of the door lock condition, in accordance with Part II, Steps A. through C., of the Accomplishment Instructions of Boeing Service Bulletin 757-25-0182, Revision 2, dated January 11, 2001. If the test indicates that the compartment door is not locking positively, concurrently with or before accomplishing the actions specified in paragraph (g) of this AD, replace the target and remount the switch on the new bracket, in accordance with Part II, Steps F. through V., of the Accomplishment Instructions of Boeing Service Bulletin 757-25-0182, Revision 2, dated January 11, 2001. Replacing the target and remounting the switch on the new bracket terminates the testing requirement in this paragraph.
(3) For airplanes identified in Boeing Service Bulletin 757-25-0200, Revision 1, dated August 3, 2000: Concurrently with or before accomplishing the actions required by paragraph (g) of this AD, install a bumper assembly on the left and right off-wing escape slide carriers, and install new placards in the area of the maintenance access door, in accordance with the Accomplishment Instructions of Boeing Service Bulletin 757-25-0200, Revision 1, dated August 3, 2000.
(4) For airplanes identified in Boeing Special Attention Service Bulletin 757-25-0219, dated August 3, 2000: Concurrently with or before accomplishing the actions required by paragraph (g) of this AD, install a bumper assembly on the left and right off-wing escape slide carriers, and install new placards in the area of the maintenance access door, in accordance with the Accomplishment Instructions of Boeing Special Attention Service Bulletin 757-25-0219, dated August 3, 2000.
(5) Using new parts having the same part number where the service information calls for installation of kept parts is acceptable for compliance with the requirements of this AD.
Actions done in accordance with paragraph (h)(1) of this AD terminate the requirements of paragraph (a)(1) of AD 99-17-20, Amendment 39-11266 (64 FR 45436, August 20, 1999).
Actions done in accordance with paragraph (h)(3) of this AD terminate the corresponding requirements of paragraph (a)(2) of AD 99-17-20, Amendment 39-11266 (64 FR 45436, August 20, 1999).
Actions done before the effective date of this AD in accordance with Boeing Service Bulletin 757-25-0200, dated January 21, 1999, are acceptable for compliance with the corresponding requirements of paragraphs (h)(3) and (h)(4) of this AD. Actions done before the effective date of this AD in accordance with Boeing Special Attention Service Bulletin 757-25-0298, dated October 16, 2008, are acceptable for compliance with the corresponding requirements of paragraph (g) of this AD.
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
