Fri, May 21, 2021
AD 2021-10-09 Requires Removal, Inspection, And Replacement Of The Affected HPT Inner Stationary Seal
The FAA is adopting a new airworthiness directive (AD) for all CFM International, S.A. (CFM) CFM56-5B and CFM56-7B model turbofan engines with a certain high-pressure turbine (HPT) inner stationary seal installed.
This AD was prompted by cracks found in the rotating air HPT front seal. This AD requires removal, inspection, and replacement of the affected HPT inner stationary seal and, depending on the findings, replacement of the rotating air HPT front seal, HPT rotor blades, and No. 3 ball bearing. The FAA is issuing this AD to address the unsafe condition on these products. This AD is effective June 24, 2021.
Supplementary Information: The FAA issued a notice of proposed rulemaking (NPRM) to amend 14 CFR part 39 by adding an AD that would apply to all CFM CFM56-5B and CFM56-7B model turbofan engines with a certain HPT inner stationary seal installed. The NPRM published in the Federal Register on September 20, 2019 (84 FR 49487). The NPRM was prompted by a report that two cracks were discovered on a CFM CFM56-5B model turbofan engine rotating air HPT front seal during a routine engine shop visit. After investigation, CFM determined that the HPT inner stationary seal, part number 1808M56G01, may not have received the correct braze heat treat cycle at the time of the honeycomb replacement. As a result, the affected HPT inner stationary seal could lead to a localized separation of the replaced honeycomb, which may reduce the life of the rotating air HPT front seal. In the NPRM, the FAA proposed to require removal, inspection, and replacement of the affected HPT inner stationary seal and, depending on the
findings, replacement of the rotating air HPT front seal, HPT rotor blades, and No. 3 ball bearing. The FAA is issuing this AD to address the unsafe condition on these products.
More News
Also: SkyReach Parts Support, Piper Service Ctr, Airliner Near-Miss, Airshow London The Judge overseeing Icon's convoluted Chapter 11 process has approved $9 million in Chapter 11 >[...]
ILS PRM Approach An instrument landing system (ILS) approach conducted to parallel runways whose extended centerlines are separated by less than 4,300 feet and at least 3,000 feet >[...]
Aero Linx: FlyPups FlyPups transports dogs from desperate situations to fosters, no-kill shelters, and fur-ever homes. We deliver trained dogs to veterans for service and companion>[...]
Also: Skydio Chief, Uncle Sam Sues, Dash 7 magniX, OR UAS Accelerator US Secretary of the Air Force Frank Kendall was given a turn around the patch in the 'X-62A Variable In-flight>[...]
Also: NBAA on FAA Reauth, DJI AG Drones, HI Insurance Bill Defeated, SPSA Airtankers The Beechcraft Denali continues moving forward towards certification, having received its FAA T>[...]