Document ID: chunk:federal_register_of_legislation:F2012L00544:body:0:p2
Version: federal_register_of_legislation:F2012L00544
Segment Type: other
Provision Reference: 
Character Range: 3766–6940

a fit of 0.0000 to -0.0013 inch. No fretting is allowed on the impeller after machining.

        (e) Due to previous fretting, an impeller with a -1 coupling removed might have to be machined for a -3 coupling. Plating of the impeller ID is not allowed.

        (f) Fluorescent penetrant inspect the impeller.

        (g) Install a new compressor adaptor coupling, P/N 23076559-2 or -3; or

        (h) If a new impeller is installed, then install compressor adaptor coupling, P/N 23076559-1.

        (i) Heating of the impeller per the engine overhaul manual is required to install the coupling to achieve the target fit specified in Table 3 of this Directive:
   New adaptor         Adaptor OD              Fit (interference)
     (i) 23076559-1     0.9000 to 0.9008 inch   0.0000 to -0.0013 inch.
     (ii) 23076559-2    0.9020 to 0.9028 inch   0.0000 to -0.0013 inch.
     (iii) 23076559-3   0.9040 to 0.9048 inch   0.0000 to -0.0013 inch.

        (j) The mating surfaces of the impeller and coupling must not have any fretting. Do not install a -1 coupling into a used impeller.

   Note:  FAA AD 2004-26-09 Amdt 39-13921 refers.

Compliance:     1. Alcor Compressor Adaptor Couplings

                  (a) For couplings with 600 or more operating hours-since-new as of the effective date of this Directive, or the operating hours are unknown and cannot be determined, remove couplings from service within 50 additional operating hours after the effective date of this Directive or by 15 June 2005, whichever occurs later.

                  (b) For couplings with fewer than 600 operating hours-since-new on the effective date of this Directive, remove couplings from service before exceeding 650 operating hours-since-new or by 15 June 2005, whichever occurs later.

                2. EXTEX and SAP Compressor Adaptor Couplings

                  (a) For couplings with 600 or more operating hours-since-new as of the effective date of this Directive, or the operating hours are unknown and cannot be determined, remove couplings from service within 100 additional operating hours after the effective date of this Directive or by 15 June 2005, whichever occurs later.

                  (b) For couplings with fewer than 600 operating hours-since-new on the effective date of this Directive, remove couplings from service within 150 additional operating hours after the effective date of this Directive or by 15 June 2005, whichever occurs later.

                3. RRC Compressor Adaptor Couplings

                At the next time the compressor rotor is disassembled for any reason, but not later than 1 March 2017, subject to the following conditions:

                  (a) The engine has been operating with acceptable power assurance checks.

                  (b) The engine, gearbox, or turbine has not experienced any recent chip lights or metal in oil events.

                  (c) All mandatory bulletins issued by RRC have been accomplished within the designated compliance requirements.

                  (d) That the maintenance records indicate proper engine maintenance has been performed per the applicable Operations and