Airworthiness directives › 2019-12-01
AD 2019-12-01 Airworthiness Directives; CFM International S.A. Turbofan Engines
Applicability*9
This AD applies to all CFM International S.A. (CFM) LEAP-1B21, -1B23, -1B25, -1B27, -1B28, -1B28B1, -1B28B2, -1B28B3, -1B28B2C, -1B28BBJ1, and -1B28BBJ2 model turbofan engines with radial drive shaft (RDS) bearing, part number (P/N) 92D08200 or P/N 92D08201, installed.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
(1) Inspect the transfer gearbox (TGB) 1 and TGB2 scavenge screens in accordance with the Accomplishment Instructions, paragraph 5.A.(1), of CFM Service Bulletin (SB) LEAP-1B-72-00-0222-01A-930A-D, Issue 007, dated May 17, 2019, as follows: (i) For affected engines with engine serial number (ESN) 602499 and lower: (A) After the RDS bearing accumulates 50 flight hours (FHs) since new but before accumulating 250 FHs since new, or within 50 FHs after the effective date of this AD, whichever occurs later, perform an initial inspection of the TGB1 and TGB2 scavenge screens. (B) Thereafter, perform repetitive inspections of the TGB1 and TGB2 scavenge screens at intervals not exceeding 250 FHs since the last inspection. (ii) For affected engines with ESN 602500 and higher: (A) After the RDS accumulates 50 FHs since new but before accumulating 100 FHs since new, or within 50 FHs after the effective date of this AD, whichever occurs later, perform an initial inspection of the TGB1 and TGB2 scavenge screens. (B) Thereafter, perform repetitive inspections of the TGB1 and TGB2 scavenge screens at intervals not exceeding 100 FHs since the last inspection. (iii) Based on the results of these inspections, remove the engine from service or return the engine to service using the criteria in the Accomplishment Instructions, Paragraphs 5.A.(2) through 5.A.(5), of CFM SB LEAP-1B-72-00-0222-01A-930A-D, Issue 007, dated May 17, 2019. (2) [Reserved]
Unsafe condition
This AD was prompted by multiple reports of in-flight shutdowns (IFSDs) due to RDS bearing cage failure. The FAA is issuing this AD to prevent failure of the RDS bearing. The unsafe condition, if not addressed, could result in failure of one or more engines, loss of thrust control, and loss of the airplane.
Affected ADs
None.
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