Airworthiness Directive · Amendment 39-19589 · Turbine engine compressor section
Honeywell International Inc. Turbofan Engines
This AD applies to all Honeywell International Inc. (Honeywell) TFE731-20R, -20AR, -20BR, and TFE731-40, -40AR, -40BR, and -40R turbofan engines with a fan disk part number (P/N) 3060287-2 and with a serial number (S/N) listed in Table 9 of Honeywell Service Bulletin (SB) TFE731-72-5256, Revision 0, dated October 7, 2016, that do not have “T43374” marked adjacent to the fan disk P/N or S/N.
We are superseding Airworthiness Directive (AD) 2017-20-01 for certain Honeywell International Inc. (Honeywell) TFE731-20 and TFE731- 40 turbofan engines. AD 2017-20-01 required removing the affected fan disk and replacing it with a fan disk eligible for installation. Since we issued AD 2017-20-01, we determined that some turbofan engine models were omitted from the applicability of AD 2017-20-01. This AD adds turbofan engine models to the applicability and removes the Honeywell TFE731-20 turbofan engine model from the applicability. This AD requires removal of affected fan disks and replacement with parts eligible for installation. This AD was prompted by two fan disks found with surface rollovers in the dovetail slot area. We are issuing this AD to address the unsafe condition on these products.
Remove the affected fan disk using the following criteria:
(1) Remove fan disks with 9,000 cycles since new (CSN) or more as of the effective date of this AD, within 100 cycles-in-service (CIS), or at the next engine shop visit, or at next access, whichever occurs first, after the effective date of this AD.
(2) Remove fan disks with between 8,000 and 8,999 CSN, inclusive, as of the effective date of this AD, within 9,100 CSN or within 1,000 CIS, or at the next engine shop visit, or at next access, whichever occurs first, after the effective date of this AD.
(3) Remove fan disks with fewer than 8,000 CSN as of the effective date of this AD, before exceeding 9,000 CSN, or at the next engine shop visit, or at next access, whichever occurs first, after the effective date of this AD.
(4) Replace any removed fan disk with a part eligible for installation.
Do not install an affected fan disk, P/N 3060287-2, unless “T43374” is marked adjacent to the fan disk P/N or S/N onto any engine identified in the Applicability paragraph of this AD.
(1) For the purposes of this AD, an “engine shop visit” is defined as the removal of the tie-shaft nut from the engine.
(2) For the purposes of this AD, “access” is defined as the removal of the fan rotor assembly from the engine.
(3) For the purposes of this AD, a “part eligible for installation” is:
(i) A fan disk not listed in the Accomplishment Instructions, Table 9, in Honeywell SB TFE731-72-5256, Revision 0, dated October 7, 2016; or
(ii) a fan disk listed in the Accomplishment Instructions, Table 9, in Honeywell SB TFE731-72-5256, Revision 0, dated October 7, 2016, that has been inspected, reworked, and marked with “T43374” adjacent to the fan disk P/N or S/N. Guidance on returning affected parts to Honeywell for inspection and rework is found in the Accomplishment Instructions, paragraph 3.D., of Honeywell SB TFE731-72-5256, Revision 0, dated October 7, 2016.
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.
