Airworthiness Directive · Amendment 39-15657 · Landing gear
ATR Model ATR42-200, -300, and -320 Airplanes
This AD applies to ATR Model ATR42-200, -300, and -320 airplanes, certificated in any category; excluding airplanes on which ATR Modification 8463 has been done.
We are adopting a new airworthiness directive (AD) for the products listed above. This AD results from mandatory continuing airworthiness information (MCAI) originated by an aviation authority of another country to identify and correct an unsafe condition on an aviation product. The MCAI describes the unsafe condition as:
For MLG side brace assemblies with part number (P/N) D22710000, without suffix “-9”: Unless already done, do the following actions.
(1) For airplanes on which the MLG side brace assemblies have not been inspected as of the effective date of this AD, in accordance with the Accomplishment Instructions of Messier-Dowty Service Bulletin 631-32-191, Revision 1, dated February 26, 2007: Perform the initial eddy current inspection for cracking of the MLG side brace, in accordance with the Accomplishment Instructions of Messier-Dowty Special Inspection Service Bulletin 631-32-191, Revision 2, dated August 30, 2007, at the applicable time specified in Table 1 of this AD. Unless otherwise specified, the flight cycles and times indicated in Table 1 of this AD must be interpreted as total flight cycles since overhaul, or time since overhaul, and as total flight cycles since new or time since manufacture for side brace assemblies that have not undergone any overhaul yet.
| For a MLG side brace assembly with the total flight cycles since new or total flight cycles since overhaul specified below as of the effective date of this AD— | Do the initial inspection at the time specified below— |
|---|---|
| More than 8,000 flight cycles | Within 500 flight cycles after the effective date of this AD. |
| 5,000 or more total flight cycles, but not more than 8,000 total flight cycles | Within 1,000 flight cycles after the effective date of this AD or before accumulating 8,500 flight cycles, whichever occurs first. |
| Less than 5,000 flight cycles | Within 2,000 flight cycles after the effective date of this AD or before accumulating 6,000 flight cycles, whichever occurs first. |
(2) For airplanes on which the MLG side brace assemblies have been inspected as of the effective date of this AD, in accordance with the Accomplishment Instructions of Messier-Dowty Service Bulletin 631-32-191, Revision 1, dated February 26, 2007: Within 1,000 flight cycles after the last inspection or within 200 flight cycles after the effective date of this AD, whichever occurs later, perform an eddy current inspection for cracking of the MLG side brace, in accordance with the Accomplishment Instructions of Messier-Dowty Special Inspection Service Bulletin 631-32-191, Revision 2, dated August 30, 2007.
(3) After accomplishment of the inspection required by paragraph (f)(1) or (f)(2) of this AD, repeat the inspection at intervals not to exceed 2,600 flight cycles in accordance with the Accomplishment Instructions of Messier-Dowty Special Inspection Service Bulletin 631-32-191, Revision 2, dated August 30, 2007.
(4) If any crack is found during any inspection required by paragraphs (f)(1), (f)(2) and (f)(3) of this AD, before further flight, replace the affected side brace in accordance with the Accomplishment Instructions of Messier-Dowty Special Inspection Service Bulletin 631-32-191, Revision 2, dated August 30, 2007.
(5) At the applicable time specified in paragraph (f)(5)(i) or (f)(5)(ii) of this AD: Inspect for cracking, corrosion, and defects of the MLG side brace assemblies with P/N D22710000, without suffix “-9”, in accordance with the Accomplishment Instructions of Messier-Dowty Service Bulletin 631-32-194, dated June 6, 2007.
(i) For airplanes having side brace assemblies on which Messier-Bugatti Service Bulletin 631-32-072 has not been incorporated: Before accumulating 16,000 total flight cycles or within 8 years after the effective date of this AD, whichever occurs first.
(ii) For airplanes having side brace assemblies on which Messier-Bugatti Service Bulletin 631-32-072 has been incorporated: Before accumulating 19,000 total flight cycles or within 8 years after the effective date of this AD, whichever occurs first.
(6) If no cracking, corrosion, or defect is found during any inspection required by paragraph (f)(5) of this AD, before further flight, modify and re-identify (by adding a suffix “-9” to P/N D22710000) the MLG side brace assemblies in accordance with the Accomplishment Instructions of ATR Service Bulletin ATR42-32-0092, dated June 25, 2007.
(7) If any cracking, corrosion, or defect is found during any inspection required by paragraph (f)(5) of this AD, before further flight, replace the discrepant MLG side brace assembly with a modified and re-identified MLG side brace assembly in accordance with the Accomplishment Instructions of ATR Service Bulletin ATR42-32-0092, dated June 25, 2007.
Note: This AD differs from the MCAI and/or service information as follows: Although the MCAI or service information allows further flight if a crack is found during compliance with the required inspections, this AD requires that you repair the crack before further flight.
