Airworthiness directives › 2024-12-03
AD 2024-12-03 Airworthiness Directives; CFE Company Engines
Models named: CFE738-1-1B. Read the applicability below — it usually turns on serial or part numbers too.
Applicability*9
This AD applies to CFE Company (CFE) Model CFE738-1-1B engines with an installed high-pressure turbine (HPT) stage 1 disk or HPT stage 2 disk with a part number (P/N) and serial number (S/N) identified in Section 1. Planning Information, paragraph E. Compliance, Tables 2 and 3 of CFE Service Bulletin (SB) CFE738-72-A8082, dated July 4, 2023 (CFE738-72-A8082).
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
At the applicable times specified in paragraphs (g)(1) and (2) of this AD, remove each affected HPT stage 1 disk and HPT stage 2 disk from service and replace with a part eligible for installation, in accordance with steps (1) through (9) in paragraph B. of the Accomplishment Instructions of CFE738-72-A8082. (1) For affected HPT stage 1 disks, at the next piece-part exposure or before exceeding 2,450 cycles since new (CSN), whichever occurs first. (2) For affected HPT stage 2 disks, at the next piece-part exposure or before exceeding 2,930 CSN, whichever occurs first.
Unsafe condition
This AD was prompted by a manufacturer investigation that revealed certain HPT stage 1 disks and HPT stage 2 disks were manufactured from powder metal material suspected to contain iron inclusion. The FAA is issuing this AD to prevent premature fracture and consequent uncontained failure. The unsafe condition, if not addressed, could result in uncontained debris release, damage to the engine, and damage to the airplane.
Affected ADs
None.
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