The "Yakovlev" company has released a service bulletin with a precise description of the algorithm of actions for technicians to inspect 14 SSJ-100 aircraft after identifying flaws in the fuselage design.
During the operation of RRJ-95 aircraft, specialists identified deviations in the typical fuselage design at the joint of stringers 42-44 with the beam-doubler of frame 12 of section Ф2 from the design documentation.
Urgent Works
Deputy Head of Rosaviatsia, Andrei Dobryakov, instructed air carriers to carry out service work on aircraft with serial numbers 95104–95117 (14 in total), which may have structural deviations. All aircraft in this batch were produced in 2016.
In the absence of stringer fasteners on already operating aircraft, it is prescribed to limit their airworthiness until technical deviations are corrected. Specifically for these repair works, "Yakovlev" has released a service bulletin with a precise description of the algorithm of actions for technicians.
Exact Location of the Problem
Fastening problems on some SSJ-100 aircraft may occur between the passenger door and the cockpit, according to the bulletin. To check the aircraft, it is necessary to conduct a detailed inspection of the skin, as well as frames, beams, and stringers for deformations, folds, cracks, and loosening of riveted or bolted joints.
For this, it is necessary to dismantle the door opening skin, remove the toilet module, and remove the thermal and sound insulation mats. This will give the technician access to the structural elements that he must inspect.
It is necessary to use special tools — a telescopic mirror, a magnifying glass, and a flashlight — to detect possible micro-damages. If deviations in the design are confirmed, the aircraft must be sent for repair.
Why are Airworthiness Directives Issued
The founder of the flight safety service RunAvia, Andrei Patrakov, explained that airworthiness directives are issued for urgent execution when the risk to flight safety is assessed as high.
Based on the directives, aircraft may be suspended from flights. This is what airworthiness limitations are.
During the operation of aircraft equipment, manufacturing and design defects are sometimes discovered that did not manifest themselves during testing.
In this case, an assumption is made that the fasteners are weakened, which could potentially lead to problems, Panteleev clarified. According to him, a similar logic is implemented in recall campaigns in the automotive industry. It is not a fact that a particular aircraft has a defect, but it needs to be checked to ensure safety.
Earlier www1.ru reported that a video of testing the new PD-35 aircraft engine has appeared, but there is no aircraft for it yet.
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