Airworthiness directives › 2013-24-01
AD 2013-24-01 Airworthiness Directives; The Boeing Company Airplanes
Models named: 747-8, 747-8F series, 787-8. Read the applicability below — it usually turns on serial or part numbers too.
Applicability*9
This AD applies to The Boeing Company airplanes, certificated in any category, identified in paragraphs (c)(1) and (c)(2) of this AD. (1) Model 747-8 and 747-8F series airplanes powered by GEnx-2B67 or GEnx-2B67B engines. (2) Model 787-8 airplanes powered by GEnx-1B64, GEnx-1B67, GEnx-1B70, GEnx-1B64/P1, GEnx-1B67/P1, GEnx-1B70/P1, or GEnx-1B70/75/P1 engines. Note 1 to paragraph (c)(2) of this AD: The engine nameplate may also include a suffix such as “G03,” which is the applicable Bill of Materials (See FAA Type Certification Data Sheet T00021SE basic model identifier).
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
Within 7 days after the effective date of this AD, revise the Certificate Limitations chapter of the applicable Boeing AFM to include the statement provided in figure 1 to paragraph (g) of this AD. This may be done by inserting a copy of this AD into the AFM. Figure 1 to Paragraph (g) of This AD—Certificate Limitations AVOIDANCE OF ICE CRYSTAL ICING (Required by AD 2013-24-01.) In order to prevent loss of thrust and engine damage due to ice crystal icing, for operations at or above 30,000 feet, when approaching, or in, instrument meteorological conditions or visible moisture: The flight crew must comply with the Avoidance of Ice Crystal Icing procedure contained in the Operating Procedures chapter of this manual. When following the Avoidance of Ice Crystal Icing procedure, flight is prohibited within 50NM of amber or red radar returns that are displayed below the airplane's flight path. Note 2 to figure 1 to paragraph (g), figure 2 to paragraph (h), and figure 3 to paragraph (i) of this AD: When statements identical to those in figures 1, 2, and 3 to paragraphs (g), (h), and (i) of this AD, respectively, have been included in the applicable chapters of the general revisions of the applicable AFM, the general revisions may be inserted into the AFM, and the copy of this AD may be removed from the AFM.
Unsafe condition
This AD was prompted by reports of engine damage and thrust loss events as a result of flying in high altitude ice crystal icing (ICI) conditions. We are issuing this AD to ensure that the flight crews have operating instructions to avoid flight into ICI conditions that can lead to engine damage and thrust loss events. We are also issuing this AD to ensure the airplane has a minimum number of airworthy engines following a potential high altitude ICI encounter. Operation with more than one engine having icing damage can lead to a common cause loss of thrust on multiple engines, which can lead to a forced landing.
Affected ADs
None.
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