Airworthiness directives › 2013-21-03
AD 2013-21-03 Airworthiness Directives; the Boeing Company Airplanes
Models named: 747-8F, 747-8 series. Read the applicability below — it usually turns on serial or part numbers too.
Applicability*9
This AD applies to the Boeing Company Model 747-8F and 747-8 series airplanes, certificated in any category, as identified in Boeing Alert Service Bulletin 747-27A2515, dated August 23, 2013.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
Except as required by paragraph (h)(1) of this AD, at the time specified in paragraph 1.E., “Compliance,” of Boeing Alert Service Bulletin 747-27A2515, dated August 23, 2013: Do a detailed inspection of the inboard elevator left and right power control actuator (PCA) installations to determine if a bushing is installed; and do a general visual inspection between the left and right horizontal stabilizer rear spar and the elevator front spar, and between stabilizer station (STAB) (STA) 235 and 260 for defects and damage, and do all applicable corrective actions that are labeled as “RC” (Required for Compliance), in accordance with the Accomplishment Instructions of Boeing Alert Service Bulletin 747-27A2515, dated August 23, 2013, except as required by paragraph (h)(2) of this AD. Doing the steps specified in Parts 1 and 2 of the Accomplishment Instructions of Boeing Alert Service Bulletin 747-27A2515, dated August 23, 2013, are required for compliance. Do all applicable corrective actions that are labeled as “RC” before further flight.
Unsafe condition
This AD was prompted by a report of unusual noise coming from the left inboard elevator during a functional check of the ram air turbine system, and a determination that a bushing was not installed. We are issuing this AD to detect and correct non-installation of bushings. If the bushings are not present, the stiffness of the load path will be decreased, which will cause wear of adjacent parts and increased freeplay of the elevator surfaces. Freeplay that exceeds acceptable limits could result in divergent flutter for certain maneuvers, which could lead to loss of controllability of the airplane.
Affected ADs
None.
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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