Summary
We are adopting a new airworthiness directive (AD) for certain Boeing Model 747 airplanes identified above. This AD requires replacing the inboard trailing edge (TE) flap transmission carbon disk no-back brakes with skewed roller no-back brakes at the TE flap transmission, positions 4 and 5. This AD results from reports of the inboard TE flaps blowing back due to the failure of a transmission carbon disk no-back brake. The no-back brake did not hold the TE flaps in the commanded position. We are issuing this AD to prevent a decrease of the aerodynamic controllability of the airplane, which could adversely affect the airplane's continued safe flight and landing.
Directive Details
AD Number
FAA-2009-0293
Document Number
E9-23555
Type
Rule
Publication Date
October 1, 2009
Effective Date
November 5, 2009
Affected Manufacturer
Boeing Model 747-100, -100B, -100B SUD, -200B, -200C, -200F, -300, -400, -400D, -400F, and 747SR Series
Criticality
important
Emergency
No
Docket ID
Docket No. FAA-2009-0293
Topics
Official Documents
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