Product Improvement Test of Engine Tail Pipe Indicator and Recorder Installed in UH-1B Helicopter.

摘要

Frequent, prolonged over-temperature events will severely limit the service life of any gas turbine engine and may result in catastrophic failure. Occasionally, these over-temperatures are not recorded accurately on the aircraft maintenance forms. An accurate, lightweight, automatic system for recording over-temperature events would provide valuable information for the proper maintenance of gas turbine engines, and for the timely removal of engines which have been subjected to temperatures beyond allowable limits. A test system was developed to provide a record of the frequency and duration of over-temperature events in addition to providing the pilot with an EGT indicator. The EGT recorder was designed to record the occurrence of temperatures above three significant, preselected values: 625 C. during the starting cycle only and 650 C. and 760 C. during flight operations. The United States Army Aviation Test Board (USAAVNTBD) was directed to test two EGT indicator-recorders installed in UH-1B/540 helicopters.