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1

I work within a engine test facility. During a compressor wash process we inject water and detergent. This also depends on how much work have been carried out during the overhaul on the engine. The positions are given only to provide an even flow of water through the engine. Sadly I have no experience with live aircraft, so I can not comment when their on ...


0

S1000D is the successor of iSpec 2200 since 2012. The standard is now free of charge and can be easily downloaded from S1000D website.


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FIM contains procedures for both A/C systems (E.G. EICAS, ECAM, CPDS) messages and pilots/maitenance observations (e.g. smell of burning oil, windshield delamination). All kind of reasonably possible faults should be covered by FIM. Just simply use yor FIM preambule to determine if it specifies what to do when fault is not covered by FIM and to determine ...


1

Preflight may consist items which are GVI in its nature. But the difference is how regulations treats such inspection (preflight). As per Commission Regulation (EU) No 1321/2014 Pre-flight is not considered to be maintenance: (h) ‘maintenance’ means any one or combination of the following activities: overhaul, repair, inspection, replacement, modification ...


2

A GVI is a maintenance procedure that has to be performed by a mechanic qualified to do so, to satisfy a Maintenance Program requirement, and which will require a maintenance release to be signed off. A pre-flight inspection is an inspection performed by a pilot in command (or someone delegated by the PIC - like a First Officer, or a mechanic) to satisfy ...


0

I don't know the specifics for that plane, but in general you do oil changes with the oil warm so that it is less viscous, so there's a minimum amount of dirty, old oil left inside the engine (and so you don't have to wait hours for it to drain). However it's generally a bad idea to do it while the engine is still at operating temperature, because then the ...


0

When the engine is running, it sucks up the oil from the reservoir and puts it in all the galleries, ie the oil's all in the right places to lubricate the engine. When you shut the engine down, the oil starts returning to the reservoir by gravity. So there's a gentle drip-feed back into the reservoir, which means that the apparent oil quantity measured at ...


19

As part of the investigation the authorities followed that part through the system and scrutinized every step of the AoA's life. When they looked at Xtra they found numerous issues with the company and how they handled repairs. The FAA's press release on Xtra says: According to the order, Xtra failed to comply with requirements to repair only aircraft ...


22

The FAA action, while supposedly not directly related Lion Air but more to Xtra's problems with working on parts they were not authorized to work on because they hadn't demonstrated that had everything in place, is obviously politically related to the event because the crash put the spotlight on Xtra and the FAA had to do something once having lifted that ...


8

A performance increase after a compressor wash is expected to happen, but it does not return to the original performance as there are more degradation mechanisms at play. This answer explains that organic build-up causes a change in airfoil shape causing the recoverable performance degradation. Another source may be deposition of salts and dissolved ...


5

The compressor blades accumulate a coating of organic material from the atmosphere on the blades, which in the later stages, where the temperatures get above the material's flash point, may be mostly carbon from cooked organic material like pollen and bugs (the same sort of blackened accumulated crud you'll see on the butterfly of a late stage compressor ...


9

Some fatigue related issues that are not directly tied to departures and arrivals, like wing bending from gust loads, but may be randomly continuous throughout the flight, need an hour limit. Taking it to a comical extreme, if the airplane flew for 3 years straight without ever landing because it had a new pixie dust powered engine, it would have close to ...


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