Airworthiness directives › 2018-20-22
AD 2018-20-22 Airworthiness Directives; General Electric Company Turbofan Engines
Applicability*9
(1) This AD applies to General Electric Company (GE) GE90-110B1, GE90-113B, and GE90-115B turbofan engines with a case combustor assembly (combustion case), part number (P/N) 2063M37G01 or 2082M19G04, installed with combustion case serial number (S/N) listed in: (i) Table 1 in paragraph 1.A., Planning Information, of GE GE90-100 Service Bulletin (SB) S/B 72-0788, Revision 4, dated July 30, 2018; or (ii) Paragraph 1.A, Table 1 of GE SB GE90-100 SB 72-0793 R00, dated August 10, 2018; or (iii) Paragraph 1.A., Planning Information, of GE SB GE90-100 SB 72-0784 R00, dated May 4, 2018. (2) [Reserved.]
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
(1) For combustion cases listed in Planning Information, Table 1, paragraph 1.A. of GE SB GE90-100 S/B 72-0788, Revision 4, dated July 30, 2018, except combustion cases with S/Ns FDBK3717, FDBK3872, or FDBK4849, remove the affected cases from service, using the cycles specified in Table 1 to paragraph (g) of this AD. ER26OC18.001 (2) For combustion cases with S/Ns listed in Table 3, paragraph 1.C., Planning Information, of GE SB GE90-100 S/B 72-0788, Revision 4, dated July 30, 2018, remove the affected cases from service before exceeding the Maximum In-Service CSN listed in Table 3, of GE SB GE90-100 S/B 72-0788, Revision 4, dated July 30, 2018. (3) For combustion cases with S/Ns listed in paragraph 1.A., Planning Information, of GE SB GE90-100 SB 72-0784 R00, dated May 4, 2018, remove the affected cases from service within 10 cycles in service from the effective date of this AD. (4) For combustion cases with S/Ns listed in Table 1, paragraph 1.A., Planning Information, of GE SB GE90-100 SB 72-0793 R00, dated August 10, 2018, remove the affected cases from service at the next engine shop visit. (5) Replace the removed combustion case with a part eligible for installation before further flight.
Unsafe condition
This AD was prompted by the discovery of a quality escape at a manufacturing facility involving unapproved welds on combustion cases. We are issuing this AD to prevent failure of the combustion case. The unsafe condition, if not addressed, could result in engine fire and damage to the airplane.
Affected ADs
None.
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