Airworthiness directives › 2018-21-01
AD 2018-21-01 Airworthiness Directives; Honeywell International Inc. Turbofan Engines
Applicability*9
This AD applies to Honeywell International Inc. (Honeywell) AS907-1-1A turbofan engines with second stage low-pressure turbine (LPT2) rotor blades, part number 3035602-1, installed, that have more than 8,000 hours since new on November 9, 2017 (the effective date of AD 2017-20-06).
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
Within 200 hours time in service after the effective date of this AD, do the following: (1) Perform a one-time borescope inspection for wear of the Z gap contact area at the blade tip shroud for each of the 62 LPT2 rotor blades. Use the Accomplishment Instructions, Paragraph 3.B.(1), of Honeywell Service Bulletin (SB) AS907-72-9067, Revision 1, dated March 20, 2017, to do the inspection. (2) If the measured wear and/or fretting of any Z gap contact area is greater than 0.005 inch, replace the LPT2 rotor assembly with a part eligible for installation before further flight. (3) Using a borescope, make a clear digital image of the Z gap contact area at the blade tip shroud of the 62 LPT2 rotor blades, and do the following: (i) Identify the three Z gap contact areas with the greatest amount of wear and/or fretting. (ii) Record the blade position on the LPT2 rotor assembly and the measured wear of the three Z gap contact areas with the greatest amount of wear and/or fretting. (iii) Send the results to Honeywell at engine.reliability@honeywell.com within 30 days after completing these actions.
Unsafe condition
This AD was prompted by reports of loss of power due to failure of the LPT2 blade. We are issuing this AD to prevent failure of the LPT2 blades. The unsafe condition, if not corrected, could result in failure of one or more engines and loss of the airplane.
Affected ADs
This AD replaces AD 2017-20-06, Amendment 39-19063 (82 FR 46379, October 5, 2017).
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