Airworthiness directives › 2014-06-04
AD 2014-06-04 Airworthiness Directives; The Boeing Company Airplanes
Models named: 747-8, 747-8F series. Read the applicability below — it usually turns on serial or part numbers too.
Applicability*9
This AD applies to The Boeing Company Model 747-8 and 747-8F series airplanes, certificated in any category, powered by General Electric (GE) Aviation GEnx-2B67 or GEnx-2B67B engines.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
For airplanes having any EEC software part number identified in paragraph (g)(1), (g)(2), or (g)(3) of this AD: Within 90 days after the effective date of this AD, remove the EEC software, as applicable; and install new EEC software that is approved by the FAA. (1) Software C032: GE P/N 2124M22P05, EEC kit number 738L370G02, Boeing P/N GEC43-2124-2205. (2) Software C040: GE P/N 2124M22P07, EEC kit number 738L370G04, Boeing P/N GEC43-2124-2207. (3) Software C045: GE P/N 2124M22P08, EEC kit number 738L370G05, Boeing P/N GEC43-2124-2208.
Unsafe condition
This AD was prompted by a determination that the existing electronic engine control (EEC) software logic can prevent stowage of the thrust reversers (TRs) during certain circumstances, which could cause the TRs to move back to the deployed position. We are issuing this AD to prevent in-flight deployment of one or more TRs due to loss of the TR auto restow function, which could result in inadequate climb performance at an altitude insufficient for recovery, and uncontrolled flight into terrain.
Affected ADs
None.
Read the original on the Federal Register →
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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