SAE AIR 5317:2018 pdf free

SAE AIR 5317:2018 pdf free.A Guide to APU Health Management
FMEA: Failure Modes and Effects Analysis – A means of ranking the APU system failures using numerical assignments for severity of effects, for probability of occurrence of a cause, and for the ability to detect a loss before it is encountered. A failure mode may be severe only if it impacts the operation or results in a loss of revenue. The cause of the failure mode may be associated with a particular APU model. The cause of some failure modes may be preventable through normal practices while other modes are not preventable. The cause of some failure modes may be easily detected while others are not predictable. Each failure mode implies a different risk to the continued successful operation of the aircraft.
MEL: Minimum Equipment List – The Federal Airworthiness Regulations require that equipment installed on an aircraft required for compliance with the Airworthiness Standards and the Operating Rules must be operative. However, the rules also permit the publication of an MEL where compliance with certain equipment requirements is not necessary. Experience has shown that with various levels of redundancy designed into the aircraft, operation of every system or installed component may not be necessary when the remaining operative equipment can provide an acceptable level of safety. The MEL authorizes the release of aircraft for flight with inoperative equipment. In order to maintain an acceptable level of safety,restrictions in the form of placards, maintenance procedures, and crew operating procedures are specified in the MEL.
The Sense element involves determination of the value of one or more physical parameters that will be used to determine the condition of the APU being monitored. The Sense element may include a variety of physical parameters, such as pressure, temperature, speed, force, vibration, as well as time of utilization or cycles count. The Sense element includes any low-level signal conditioning and amplification as well as the conversion of the sensor signal to a digital or analog representation of the measurement. The sensors may be permanently installed or may be temporarily fitted for diagnostic purposes.SAE AIR 5317 pdf free download.