Airworthiness Directive · Amendment 39-18257 · Flight controls
The Boeing Company Airplanes
This AD applies to The Boeing Company Model 787-8 airplanes, certificated in any category, as identified in Boeing Alert Service Bulletin B787-81205-SB270021-00, Issue 001, dated March 20, 2014.
We are adopting a new airworthiness directive (AD) for certain The Boeing Company Model 787-8 airplanes. This AD was prompted by numerous reports of failures of the proximity sensor within the slat skew detection mechanism assembly (DMA) leading to slats up landing events. This AD requires replacing the slat skew DMAs with new slat skew DMAs, and marking the existing identification plates on the slat with the new part number. We are issuing this AD to prevent failure of the proximity sensor, which could result in the slats being shut down and a slats up high speed landing. This condition, in combination with abnormal landing conditions such as a short runway or adverse weather conditions, could result in a runway excursion.
Within 24 months after the effective date of this AD: Replace the slat skew DMAs in slat number 5 and slat number 8 with new slat skew DMAs, and mark the existing identification plates on the slat with the new part number, in accordance with the Accomplishment Instructions of Boeing Alert Service Bulletin B787-81205-SB270021-00, Issue 001, dated March 20, 2014.
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
