Airworthiness directives › 2020-10-04
AD 2020-10-04 Airworthiness Directives; General Electric Company Turbofan Engines
Applicability*9
This AD applies to all General Electric Company (GE) GE90-110B1 and GE90-115B model turbofan engines with an interstage high-pressure turbine (HPT) rotor seal with a part number and serial number listed in Table 1 of GE GE90-100 Alert Service Bulletin (ASB) 72-A0841 R00, dated February 26, 2020 (“the ASB”).
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
(1) Perform an ultrasonic inspection (USI) of the interstage HPT rotor seal in accordance with the Accomplishment Instructions, paragraph 3.B.(1), of the ASB, as follows: (i) After the effective date of this AD, perform an initial USI of the interstage HPT rotor seal before reaching the additional cycles listed in Table 1 of the ASB. When computing the additional cycles, use the effective date of this AD instead of the issue date of the ASB. (ii) Thereafter, repeat the USI of the interstage HPT rotor seal required by paragraph (g)(1)(i) within every 100 cycles since the last inspection. (2) If, during any USI required by paragraph (g)(1)(i) or (ii) of this AD, a non-serviceable indication is found, as defined in paragraph 3.B.(2)(b) of the ASB, before further flight, remove the interstage HPT rotor seal from service.
Unsafe condition
This AD was prompted by investigative findings from an event involving an uncontained interstage HPT rotor seal failure, resulting in debris penetrating the fuselage and the other engine. The FAA is issuing this AD to prevent failure of the interstage HPT rotor seal. The unsafe condition, if not addressed, could result in uncontained interstage HPT rotor seal release, release of high-energy debris, damage to the engine, and damage to the airplane.
Affected ADs
None.
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