MRO workshops

STAGE 1

disassembling of the engine

STAGE 2

washing & cleaning of parts

STAGE 3

inspection & evaluation of parts

STAGE 4

overhaul

STAGE 5

assembling

STAGE 6

test runs

MRO workshops perform maintenance, repair and overhaul works on turbine engines to aircrafts currently used by Polish Army. Nowadays these are: jet engines like: F100-PW-229 (F-16C/D), RD-33 (MiG-33), AL-21F3 (Su-22) and turbine engines: PW127G (Casa C-295) and TW2-117 (Mi-8). Also low-power turbines for land vehicles and starter engines are being serviced.

Every aircraft engine coming to WZL-4 S.A. is disassembled in the main MRO workshop. Then its units, electric and electronic accessories are moved to specialized workshops. Parts and units left are washed and cleaned so they can be properly checked and evaluated. After evaluation those of them that don’t match strict norms and technical regulations are scraped and replaced. Others that fit in margin of error are restored.

There are several restoration methods like welding performed in main MRO workshop. But also specialized processes like: mechanical and galvanic working or plasma spraying performed in dedicated workshops.

Rejuvenated units, parts and accessories are assembled together on the engine. After preliminary regulations and ducting leakage checking the overhauled engine can be sent to test centre for further check-ups and regulations. If the test runs are positive the engine comes back to main MRO workshop where boroscope inspection is performed. If the engine passes the test it is preserved, secured, packed and sent back to owner/user.

Exactely the same sequence of MRO works take place during overhaul of: units and accessories as well as low-power turbines and starter engines.