Operation of aircraft in hostile combat areas exposes the aircraft to risks of substantial damage or loss. Engine damage can occur as a result of impact or penetration by projectiles or fragments, or by ingestion of impact debris. The risk level depends upon threat, aircraft type, and mission. Historical evidence indicates that damage is often survivable. Aircraft can often be repaired and returned to service. The damaged engine may still be able to operate. Normal action is to remove and replace a damaged engine, but replacement engines may not be available. A procedure is needed at the operational unit level to immediately assess the exact nature and extent of engine damage, as well as rapid (perhaps nonstandard) engine repair procedures for use at forward locations. Such repairs can include reblading of compressors and turbines, replacement of cracked or broken gear cases or gears, and replacement or repair of accessories. Without repairs, the aircraft fleet may quickly lose its effectiveness. Performance indicators, gas path and oil debris quantity and size, and vibration levels can help identify the location and extent of damage. Vibration analysis with portable, computerized equipment can identify damage in the engine's compressor and turbine rotating components, as well as cracked, broken, or otherwise damaged accessory drive gearboxes and accessories. Vibration analysis either provides an immediate indication that all vibration indicators are within limits, or localizes the damage to specific components for immediate replacement or repair at the operating unit location.
Vibration analysis for immediate assessment of battle-damaged gas turbine engines
Schwingungsanalyse fuer die sofortige Ermittlung kampfgeschaedigter Gasturbinentriebwerke
ASME-Papers ; Jun ; 1-8
1989
8 Seiten, 9 Bilder, 4 Tabellen
Aufsatz (Konferenz)
Englisch
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