Airworthiness Directive · Amendment 39-15282 · Flight controls
Aircraft Industries, a.s. (Type Certificate No. G24EU Formerly Held by LETECKÉ ZÁVODY a.s. and LET Aeronautical Works) Model L-13 Blanik Gliders
This AD applies to Model L-13 Blanik gliders, all serial numbers, certificated in any category.
We are adopting a new airworthiness directive (AD) for the products listed above. This AD results from mandatory continuing airworthiness information (MCAI) issued 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:
Unless already done, do the following actions:
(1) Within the next 3 months after January 7, 2008 (the effective date of this AD) and repetitively thereafter at intervals not to exceed 12 months, inspect the control bridge for cracks. Follow the procedures in LET Aircraft Industries, a.s. Mandatory Bulletin MB No.: L13 / 105a, dated May 22, 2007, except use a 10X magnifier and do a dye penetrant inspection following the procedures in chapter 5, section 5, of FAA Advisory Circular AC 43.13-1B CHG 1, dated September 27, 2001.
(2) If cracks are found during any inspection in paragraph (f)(1) of this AD, before further flight, install a new control bridge Dwg. No. (part number (P/N)) A740 370 N or Dwg. No. (P/N) A401 001N following the procedures in LET Aircraft Industries, a.s. Mandatory Bulletin MB No.: L13 / 105a, dated May 22, 2007.
Note: This AD differs from the MCAI and/or service information as follows:
(1) The service information requires a visual inspection with a 6X magnifier. We are requiring a dye penetrant inspection and a 10X magnifier to detect cracks that could go undetected using only a 6X magnifier.
(2) The MCAI requires updating the maintenance manuals to add “type A based” repetitive inspections of the control bridge. Since the maintenance manual is only one way of establishing a maintenance program, the only way we can mandate these repetitive inspections is through an AD action.
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.
Aircraft
