Airworthiness directives › 2011-27-01
AD 2011-27-01 Airworthiness Directives; Turbomeca Turboshaft Engines
Applicability*9
This AD applies to Turbomeca Arriel 1B turboshaft engines with M03 modules modified by TU 76 or TU 202, and not modified by TU 148, and if fitted with a repaired 2nd stage turbine nozzle guide vane (NGV). The M03 module contains the 2nd stage turbine NGV, 1st stage turbine disc, and 2nd stage turbine disc. Guidance on determining if an engine has an unrepaired 2nd stage turbine NGV installed can be found in paragraph 1.C. of Turbomeca Mandatory Service Bulletin (MSB) No. A292 72 0829, Version B, dated December 13, 2010.
Compliance
(1) Starting from the effective date of this AD, perform a daily check (after last flight of the day) for: (i) Normal rundown time of the GG rotor; and (ii) The free rotation of the GG rotor; and (iii) No grinding noise during the rundown check, and during the free rotation check of the GG rotor. (2) Guidance on performing the daily checks can be found in the Maintenance Manual, task 71-02-09-760-801 and task 05-20-01-200-801. (3) If the engine fails any of these daily checks, remove the engine from service before further flight.
Required actions
(1) Inspect the 2nd stage turbine NGV for a non-conforming hole configuration, at the compliance times in Table 1 of this AD. Guidance on 2nd stage turbine NGV non-conforming hole configuration can be found in Turbomeca MSB No. A292 72 0829, Version B, dated December 13, 2010. Table 1—Inspection Compliance Times If accumulated GG Cycles-in-Service (CIS) on the effective date of this AD are: Then inspect: (i) Fewer than 1,200 CIS on both the 1st and 2nd stage turbines Before exceeding 1,500 GG CIS. (ii) 1,200 or more but fewer than 1,800 CIS on either the 1st or 2nd stage turbines Before exceeding 300 GG CIS after the effective date of this AD but not to exceed 2,000 CIS on either the 1st or 2nd stage turbines. (iii) 1,800 or more but fewer than 2,400 CIS on either the 1st or 2nd stage turbine Before exceeding 200 GG CIS after the effective date of this AD but not to exceed 2,500 CIS on either the 1st or 2nd stage turbines. (iv) Greater than 2,400 CIS on either the 1st or 2nd stage turbine Before exceeding 100 GG CIS after the effective date of this AD but not to exceed 3,000 CIS on either the 1st or 2nd stage turbine. (2) If the configuration of the holes in the repaired 2nd stage turbine NGV are conforming, then no further action is required. (3) If the configuration of the holes in the repaired 2nd stage turbine NGV are non-conforming, then before further flight: (i) Replace the 2nd stage turbine NGV with a 2nd stage turbine NGV eligible for installation; and (ii) Replace the 1st stage turbine disc and 2nd stage turbine disc with discs eligible for installation.
Unsafe condition
Comply with this AD within the compliance times specified, unless already done.
Affected ADs
None.
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