Airworthiness directives › 2024-25-02
AD 2024-25-02 Airworthiness Directives; CFM International, S.A. Engines
Models named: LEAP-1B21, LEAP-1B23, LEAP-1B25, LEAP-1B27, LEAP-1B28, LEAP-1B28B1, LEAP-1B28B2, LEAP-1B28B2C, LEAP-1B28B3, LEAP-1B28BBJ1. Read the applicability below — it usually turns on serial or part numbers too.
Applicability*9
This AD applies to CFM International, S.A. (CFM) Model LEAP-1B21, LEAP-1B23, LEAP-1B25, LEAP-1B27, LEAP-1B28, LEAP-1B28B1, LEAP-1B28B2, LEAP-1B28B2C, LEAP-1B28B3, LEAP-1B28BBJ1, and LEAP-1B28BBJ2 engines having an engine serial number (ESN) identified in Table 1 to paragraph (c) of this AD. Table 1 to Paragraph ( c )—Applicable ESNs ESN ESN ESN ESN ESN 60A635 60A647 60A662 60A682 60A702 60A639 60A650 60A663 60A686 60A642 60A653 60A670 60A687 60A643 60A655 60A671 60A689 60A644 60A656 60A673 60A690 60A645 60A660 60A678 60A691 60A646 60A661 60A679 60A696
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
(1) Before accumulating 2,900 cycles since new (CSN) or within 10 flight cycles after the effective date of this AD, whichever occurs later, perform the following: (i) A visual inspection of the HPC stage 2 seal in accordance with the Accomplishment Instructions, paragraph 5.B.(3) of CFM Service Bulletin LEAP-1B-72-00-0394-01A-930A-D, Issue 002-00, dated January 23, 2024 (CFM SB LEAP-1B-72-00-0394-01A-930A-D, Issue 002-00). (ii) A visual inspection of the forward arm seal teeth of the stage 3-4 blisk in accordance with the Accomplishment Instructions, paragraph 5.B.(4) of CFM SB LEAP-1B-72-00-0394-01A-930A-D, Issue 002-00. (iii) An eddy current inspection of the forward arm seal teeth of the stage 3-4 blisk in accordance with the Accomplishment Instructions, paragraph 5.B.(5) of CFM SB LEAP-1B-72-00-0394-01A-930A-D, Issue 002-00. (2) If, during the inspection required by paragraph (g)(1)(i) of this AD, any of the HPC stage 2 seal segments fail to meet the serviceability criteria specified in the Accomplishment Instructions, paragraph 5.B.(3) of CFM SB LEAP-1B-72-00-0394-01A-930A-D, Issue 002-00, before further flight, remove the unserviceable HPC stage 2 seal segments from service. (3) If, during the inspections required by paragraphs (g)(1)(ii) and (iii) of this AD, the stage 3-4 blisk fails to meet the serviceability criteria specified in the Accomplishment Instructions, paragraph 5.B.(6) of CFM SB LEAP-1B-72-00-0394-01A-930A-D, Issue 002-00, before further flight: (i) Remove the stage 3-4 blisk from service; (ii) Remove all four HPC stage 2 seal segments from service; and (iii) Replace the stage 3-4 blisk in accordance with the Accomplishment Instructions, paragraph 5.B.(7)(a) of CFM SB LEAP-1B-72-00-0394-01A-930A-D, Issue 002-00. (4) If, during the actions required by paragraphs (g)(2) and (3) of this AD, the HPC stage 2 seal is removed, before further flight, replace the HPC stage 2 seal in accordance with the Accomplishment Instructions, paragraph 5.B.(7)(b) of CFM SB LEAP-1B-72-00-0394-01A-930A-D, Issue 002-00.
Unsafe condition
This AD was prompted by a report of a quality escape involving certain high-pressure compressor (HPC) stage 2 seals manufactured without detailed finish machining, which could result in deeper rubs and mechanical damage to the seal teeth of the stage 3-4 compressor rotor blisk (stage 3-4 blisk) of the mating compressor rotor during initial operation. The FAA is issuing this AD to prevent uncontained failure of the stage 3-4 blisk. The unsafe condition, if not addressed, could result in uncontained part release, damage to the engine, and damage to the aircraft.
Affected ADs
None.
Read the original on the Federal Register →
You just looked this one up by hand
TrackAD holds all 12,278 of them and matches them against the aircraft you actually look after — airframe, engine, propeller and appliances in one pass — then works out what falls due and when.
- Bring your existing list in from a spreadsheet Paste the rows straight out of Excel. Headers like C/W Date and N/A are read for you.
- A copy that works when this does not One file. No internet, no login, no this software running. For the morning something has to be produced and the computer is not cooperating.
- $5 a month, or $50 a year Up to 50 aircraft on either.
Look round a real shop first Start free
The demonstration shop is eleven real aircraft with a year of work behind them. No account needed.
The directive text above is reproduced from the Federal Register, a work of the United States government and in the public domain. The separation into applicability, compliance and required actions is TrackAD's.*1