Maintenance of the PS-90A Commercial Turbofan Engine and Modifications Thereof

Lately the aftermarket support of aero engines underwent significant changes. High price of state-of-the-art high-tech aircraft aero engines meeting ecological requirements and high overhaul costs forced airlines and engine manufacturers to look for new solutions of business development. The solution found was transition to the joint maintenance to provide for continued engine serviceability with payment produced for a flight hour.

Together with airlines, maintenance of the PS-90A turbofans and modifications thereof is carried out by the Customer Support Department of JSC "UEC-Perm Engines" and Motorservice-PM in a close cooperation between each other and with the Operation Department and design teams of Aviadvigatel (engine designer) using the following systems:

  •  «Engine Fleet Management»;
  •  «Spare Parts Management»;
  •  «Equipment Management»;
  •  «Documentation Management».

«Engine Fleet Management» is implemented by the Customer Support Department using   «Engine» information storage and retrieval system and «Operation» automatic control system currently used at the Plant.

Fleet management is implemented starting from the point the engine is made through writing-off every engine of this type and includes the following data acquisition and classification stages:

in JSC "UEC-Perm Engines":

  • new engines assembled;
  • engines under overhaul;
  • engines not involved in the overhaul;
  • engines ready for shipping (either new or overhauled);

in airframe manufacturing companies:

  • standby engines;
  • engines onboard;
  • engines removed;

in airlines:

  • standby engines;
  • engines onboard;
  • engines temporary removed;
  • engines removed for a shop visit.

The information about aircraft engine configuration changes (replacement of parts and outsourced components, improvements according to bulletins and airworthiness directives), as well as technical condition criteria (hot section airfoils burn-off and damage, flow path airfoils damage caused by foreign object ingestion, cracks detected during maintenance) are entered into the information storage and retrieval system base using the data provided by the Customer Support Department.

 «Spare Parts Management»

At present the airlines as a rule don't maintain spare parts inventory since it is expensive and not cost-efficient. The airlines procure the minimum quantity of spare parts: the so called en-route and basic repair kits meant to prevent aircraft demurrage in strange airports. Based on the entire fleet operation experience the Customer Support Department forms a larger repair kit for fast support of the airlines.

«Customer Support Department Equipment Management »

The most complicated maintenance operations, especially those which are critical for flight safety, are performed by the Customer Support Department specialists using optical inspection systems, eddy current and ultrasonic fault indicators and other original equipment. The Customer Support Department carries out condition control, organization of replacement for repair, timeliness of calibration.

 «Documentation Management»

Aero engine operation documentation includes:

  • several volumes of the Operation Manual on paper and in electronic format;
  • Spare Parts Catalogue;
  • Service Bulletins;
  • Airworthiness Directives;
  • Maintenance Instructions.
The documentation is changed continuously. The Customer Support Department conducts documentation management to ensure its identity - distributes Operation Manual and Service Bulletins amendments, controls bringing changes into all registered copies of the Operation Manual.