Product-Improvement Test of the T53-L-11 Engine (Operational Suitability Testing of the Manual Acceleration Control)
ARMY AVIATION BOARD FORT RUCKER AL
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The UH-1 product-improvement program is a continuing attempt to correct those problem areas discovered during testing and field use of the helicopter, to improve the operational capabilities of the UH-1 , and to reduce the support requirements of the helicopter. Among the problems discovered during early testing were engine overspeeds, compressor surge, and resulting engine over temperature when the standard fuel control was switched from automatic mode to emergency Manual mode. To avoid this condition, the throttle twist grip must be retarded to achieve gas-producer speed of 70 percent prior to engaging the emergency governor. In the emergency mode, the throttle twist grip must be moved very slowly and precisely to avoid engine overspeeds and over temperatures. The test assembly has been modified to permit switch-over from automatic to emergency mode, with less possibility of exceeding engine limits, at any gas-producer speed at pressure altitudes up to 6,000 feet. In addition, because of the slower engine acceleration characteristics, the throttle twist grip may be moved more rapidly while in the emergency mode.
- Combustion and Ignition