Airworthiness Directive · Amendment 39-19656 · Turbine engine accessory drive
CFM International S.A. Turbofan Engines
Superseded. A later AD replaced this one: AD 2020-06-01. Comply with the one in force.
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.
The FAA is adopting a new airworthiness directive (AD) for certain CFM International S.A. (CFM) LEAP-1B21, -1B23, -1B25, -1B27, - 1B28, -1B28B1, -1B28B2, -1B28B3, -1B28B2C, -1B28BBJ1, and -1B28BBJ2 model turbofan engines. This AD requires initial and repetitive inspections of the transfer gearbox (TGB) scavenge screens and, depending on the results of the inspection, possible removal of the engine from service. This AD was prompted by multiple reports of in- flight shutdowns (IFSDs) due to radial drive shaft (RDS) bearing failure. The FAA is issuing this AD to address the unsafe condition on these products.
(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]
(1) Once the RDS bearing has accumulated 1,000 FHs since new, you may perform a BSI of the RDS bearing in accordance with the Accomplishment Instructions, paragraphs 5.B.(1) through 5.B.(8), of CFM SB LEAP-1B-72-00-0222-01A-930A-D dated May 17, 2019. If the results of this BSI are “satisfactory” according to the criteria in the Accomplishment Instructions, paragraphs 5.B.(6)(g), of CFM SB LEAP-1B-72-00-0222-01A-930A-D, Issue 007, dated May 17, 2019, then you are not required to perform the repetitive inspections in paragraphs (g)(1)(i)(B) or (g)(1)(ii)(B) of this AD until the RDS bearing accumulates 4,250 FHs since new.
(2) [Reserved]
(1) As an optional terminating action to the repetitive inspections required by paragraphs (g)(1)(i)(B) and (g)(1)(ii)(B) of this AD, you may perform a BSI of the RDS bearing in accordance with the Accomplishment Instructions, Paragraphs 5.B.(1) through 5.B.(8), of CFM SB LEAP-1B-72-00-0222-01A-930A-D, Issue 007, dated May 17, 2019 after the RDS bearing accumulates 3,750 FHs since new.
(i) If the results of the BSI are “satisfactory” using the criteria in Accomplishment Instructions, paragraph 5.B.(6)(g), of CFM SB LEAP-1B-72-00-0222-01A-930A-D, Issue 007, dated May 17, 2019, then you have met the repetitive inspection requirements of this AD and no further action is required.
(ii) If the results of the BSI are ”unsatisfactory” using the criteria in Accomplishment Instructions, paragraph 5.B.(6)(g), of CFM SB LEAP-1B-72-00-0222-01A-930A-D, Issue 007, dated May 17, 2019, then you must continue the repetitive inspections required by paragraphs (g)(1)(i)(B) or (g)(1)(ii)(B) of this AD.
(2) [Reserved]
For the purpose of this AD, “flight hours (FHs) since new” are the FHs accumulated on the RDS bearings on new engines delivered from production and on engines that have had the RDS bearing replaced during an engine shop visit.
The reporting requirement in paragraph 5.A.(6) in CFM SB LEAP-1B-72-00-0222-01A-930A-D, Issue 007, dated May 17, 2019, is not required by this AD.
The aircraft, engines and makers this AD names, by the model designations in its text. A model listed here may still be outside the AD's serial ranges.
