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Lubrication of Electrical Components
Published in Bella H. Chudnovsky, Lubrication of Electrical and Mechanical Components in Electric Power Equipment, 2019
The wiring on aircraft can act as conduits for water condensed by changes in temperature and altitude during flight or on the ground. Once the condensation forms within the wire bundles it starts to travel to the lowest point in the harness—usually the line replaceable unit (LRU). These units are the modularized avionics systems equipment units (black boxes) that support communication, navigation, auto flight, in-flight entertainment, or other systems. If the connectors are not properly sealed, water will eventually enter the LRU through the connectors, resulting in premature failure or corrosion problems. The Department of Defense Corrosion Prevention and Mitigation Strategic Plan in November 2004 references one of the USAF sustainment priority projects as follows: “Improved avionics reliability through the use of corrosion-inhibiting lubricants” [69].
Lubrication of Distribution Electrical Equipment
Published in Bella H. Chudnovsky, Transmission, Distribution, and Renewable Energy Generation Power Equipment, 2017
The wiring on the aircraft can act as conduits for water condensed by changes in temperature and altitude during flight or on the ground. Once the condensation forms within the wire bundles, it starts to travel to the lowest point in the harness—usually the line replaceable unit (LRU). These units are the modularized avionics systems equipment units (black boxes) that support communication, navigation, autoflight, in-flight entertainment, or other systems. If the connectors are not properly sealed, water will eventually enter the LRU through the connectors, resulting in premature failure or corrosion problems. The November 2004 DoD Corrosion Prevention and Mitigation Strategic Plan references one of the United States Air Force (USAF) sustainment priority projects as follows: “Improved avionics reliability through the use of corrosion-inhibiting lubricants” [137].
A supporting framework for estimating trade-off between cost and availability at equipment level: development and application in the aircraft MRO industry
Published in Production Planning & Control, 2022
Vipin Prakash Singh, Kunal K. Ganguly
Military aircraft is a rotary-wing or fixed-wing aircraft operated by a legal or insurrectionary armed service of any type. These are mainly designed for the destruction of enemy establishments using their ordnance (Gunston 1976). An aircraft is made of number of small replaceable equipment, which is known as line replaceable units (LRUs). An LRU is an independently functioning modular equipment that takes very little time to replace in an aircraft. In the aircraft industry, this LRU is also known as lower line replicable unit (LLRU), line replaceable components (LRC), and line replaceable item (LRI) (Soderholm 2007; Hockley and Phillips 2012; Huby 2012, 2014). LRU is ‘an essential support item which can be removed and replaced at the field level to restore the end item to an operational ready condition (MIL-PRF-49506, Notice 1 of 18th January 2005)’. The use of avionics in LRUs has increased with more acceptance of the ‘fly by wire’ technique in post-1990 aircraft manufacturing (Khan et al. 2015a, 2015b). These avionics are the electronic systems used in aircraft communications, navigation displays, management of multiple systems, and controlling other functions (Dickson 2009). In aircraft, repair of failed LRU or avionics equipment is a cost and time-consuming event. The complexity of LRU’s avionics, useful life, repair technology, and scheduling in the MRO shop also plays a vital role in the timely availability of LRU for their reuse in aircraft.