Questions tagged [aircraft-maintenance]

Use this tag for questions pertaining to the maintenance of aircraft, including owner-performed maintenance and required inspections (annual, 100-hour, etc.)

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Dust damage on turbines based on dust size

I'm conducting some research on my bachelor's thesis on predictive maintenance and I have so far not been able to find a solution to the following question: Which size of dust is more damaging to the ...
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Is post-COVID flying more dangerous? [closed]

To be clear, this doesn't relate to safety relating to the virus, I'm asking about flight safety. A comment on this question states: There's a history of accidents with aircraft just out of ...
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Can line and light maintenance be combined?

Is there any possibility to combine line maintenance and light maintenance (containing A, B and C check) under the name of line and light maintenance? In real is there any company which possesses a ...
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1answer
98 views

How do rotor tangs lock into wheel keyways?

How do the rotor tangs lock into wheel keyways? Are there special keys on the outboard wheel half that allow locking the tangs in place? Also would be great if anyone could provide me with a image of ...
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1answer
185 views

Can an unserviceable component be fitted on a serviceable aircraft for a maintenance check?

I was doing some reading on aviation regulations and I wanted to understand from an expert whether the following situation is allowable or not. I have reviewed EASA continuing-airworthiness guidelines ...
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4answers
418 views

Why landing gears still need bungee springs?

While studying landing gear, I came across this term 'bungee spring' to which there was no definitive explanation in text with regards to its usage. So in the image, you can see for the jury strut/ ...
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1answer
304 views

What is this part on a Cessna 172 engine?

Can any one tell me what this tube with the red is? This is a photo of a 1977 Cessna 172 engine. Looks like the tube is directly connected to the top of the crankshaft.
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1answer
233 views

What does “running torque” mean?

I would like to know the meaning of the phrase and especially the meaning of "running torque": Torque the inner plug to between 75 and 85lbf.in. Loosen half a turn and RETORQUE to between 15 and ...
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2answers
202 views

Could abrupt flight controls input cause damage in these circumstances?

I went flying yesterday with a friend in my 1972 Grumman AA-5. She's a good copilot for someone who doesn't know much about flying. I showed her how you can pitch up and down, cause 0G, and float, ...
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181 views

How do I have to fold a emergency slide so it can be reused?

I have the opportunity to buy a never used emergency slide from an Airbus A320 for cheap. So I need to know how they can be reused and how to deflate and repack them so I can use it for another time.
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212 views

Why is parking brake set OFF before jacking?

I have a question about the procedure to jack the aircraft for wheel replacement. According to the manual, it required to set the Parking brake OFF before starting jacking at the Main Landing Gear. ...
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1answer
95 views

What are the process involved in tire rotation during long term storage?

During Covid-19 crisis in 2020 a lot of planes are grounded for a long time. Tires of parked planes can develop flat spot hence the need to keep these tire rotate. What are the processes involved ...
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294 views

Why did some Spitfire variants have their wings clipped?

Some Spitfire variants have clipped wingtips instead of the round, elliptical wingtip. The reason for this is to increase the roll rate and low-altitude performance. My question is: How would clipping ...
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1answer
273 views

What if one of the navigation lights failed to function on a certified aircraft?

What is the implication if one of the navigation lights failed to function, would it affect the airworthiness certificate of the aircraft?
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What is the typical length of a Transport Category Aircraft Maintenance Manual (# of pages)?

This FAA publication contains the following image: The numbers it lists translate to some very long manuals: 1998: 43,071,266 pages/2,532 manuals = 17,010 pages/manual 2008: 184,068,439 pages/5,500 ...
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12k views

Why are 'ghost flights' necessary?

This article details the recent (March 2020) grounding of 90% of Ryanair's fleet due to the COVID-19 outbreak. Flight tracking data showed that all bar one of the jets had been flown in recent days:...
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347 views

How do airlines bring spare parts to aircraft stranded outside their main facilities?

No professional relationship with aviation. Just an avid follower. I guess it depends on location/part availability, etc, but looking for what typically happens. For the purpose of the question, ...
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2answers
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Does the FAA have a document that details each step found in a Component Maintenance Manual?

Is there a standard FAA document type for 'general' maintenance steps that a Component Maintenance Manual (CMM) can reference? For example: Once the bulb has been locked into the socket, reference ...
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4k views

What sort of debris has been found in 737 Max fuel tanks?

There have been numerous reports of Boeing finding "foreign object debris" in the fuel tanks of its 737 Max airliners. It's not clear what this debris is. It could range from a couple of missing ...
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241 views

How many fastener can an aircraft lose?

I see this GIF animation a few times then I wonder how many fastener can an aircraft lose before it becomes dangerous. I’m sure losing one wouldn’t be an issue due to safety margin built into every ...
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1answer
218 views

What happens when an airplane is retired? [duplicate]

With launch of new models every few years, what happens to the older airplanes which was in service for more than decades? Where does it get stored. Who buys old airplanes? Does manufacturers buys ...
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1answer
129 views

Is there a required check before selling an airliner?

In France, when selling a car, the last check (more or less a C-check) must has been done within the 6 months before the owner change. Is there an equivalent requirement for airliners? I'm more ...
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1answer
126 views

Who decides when landing gear requires an overhaul?

"If the landing gear on your aircraft is required to be overhauled periodically..." So is there a case where its been decided that landing gear does not require to be overhauled?
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108 views

How do jetliners age (major or notable checks and part replacements)?

As commercial airliners can be (and are) operated for many years (or even decades), I've started to ponder - how do they actually age? Or - in other words - what are major or notable maintenance-...
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Do UK graduates need to pass EASA modules to obtain a B1.1 License?

Apart from 3 years of practical experience and type rating, some countries ask for Part 66 modules to be passed with a minimum 75%. How about UK graduates? Additionally, for a Romanian citizen who ...
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What does “representative sample engine” mean for an overhaul extension?

If the PT6 turbo prop engine is required for an extension for overhauling due to operational reasons, the manual has to be searched if the extension is feasible for the company. The company states ...
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1answer
165 views

Why does the APU Master Switch flash during a normal APU shutdown?

Hi all and Happy New Year!!! I have a question relating to APU shutdown procedures on Airbus A320. During normal APU shutdown sequences, I noticed that after around 1m20s, the FAULT legend on APU ...
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106 views

What, if any, equipment on a commercial airliner is (allowed to be) inoperative most of the time? [closed]

Since airliners are bound by their minimum equipment list, I was wondering, which parts/systems that are not on the minimum equipment list are often inoperative on normal commercial flights.
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What are the differences between a compressor wash on wing vs on test bed

I work in an aircraft engine overhaul facility and I’m trying to understand the process of compressor washing engines on Wing compared to washing them in a test bed. What process steps are different ...
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2answers
129 views

Difference between general visual inspection and pre-flight check inspection

I know the definition of general visual inspection (GVI) but I cannot understand the differences (if there are) with a pre-flight check inspection. I am new in the field and I am not a pilot (don't ...
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3answers
364 views

What is the reason for this engine oil service procedure on a Bombardier CRJ?

Someone told me that servicing the engine oil on a Bombardier CRJ900 aircraft with the APU on could lead to the particular engine being overserviced. He then advised that the engine-oil service be ...
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2k views

What does Lion Air faking the repair of the AoA vane mean for the Florida repair shop that ceased operations?

This is a lengthy read, but worth it. I'll quote the main piece I am speaking of. At the Bali airport, a vane, known as an angle of attack sensor, was replaced. Crash investigators were presented ...
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458 views

How does the engine wash improve engine performance?

According to maintenance manual, we usually carry out engine wash (CFM56) with pure water as scheduled task. Pure water is injected into the engine from the LP compressor inlet while the engine is ...
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1answer
135 views

Are you mandated to use a Fault isolation manual when clearing a defect on an aircraft?

I operate a Bombardier Dash 8 Q400. I want to know if aircraft engineers are mandated to close or rectify a defect by only following the fault isolation manual (FIM). Can an engineer instead use his ...
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210 views

Why are some aircraft's life limited by both cycles and flight hours?

For instance the Pilatus PC-12 life is either 27,000 cycles or 30,000 flight hours, whichever comes first. I understand that the limit life in cycles is mainly due to fatigue in terms of ...
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1answer
713 views

What are the costs versus benefits of takeoff/landing on grass versus pavement in a light aircraft?

This question stated that landing on pavement is hard on tires compared to grass, however I don't necessarily agree with that. Even if it is true the impact on the gear and other components may ...
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1answer
168 views

How often are turbine blades in jet engines replaced?

How often are the turbines in the hot section of the jet engines replaced due to deteriorated TBC? or just how often are they replaced? lets say for CFM56-7
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1answer
286 views

What does pre/post modification mean in Airbus MPD?

What is the difference between POST MOD (with partial mod i.e SXXXX) and PRE MOD (with partial mod) in the applicability column of an Airbus MPD (Maintenance Planning Document)?
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1answer
172 views

What are the most maintenance-intensive parts of a helicopter?

Which components of a helicopter are the "driving" ones that require most regular attention and down-time, and how often do they last between inspection or overhaul? I don't have a specific model in ...
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1answer
157 views

Do aircraft need special modifications for polar routes?

Does an aircraft need special modification for polar routes?
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337 views

Why does A320 Main Wheel need to be tightened 3 times during installation?

I have another question related to maintenance practices. During replacing MLG wheel of A320, it is said that we need to tighten the wheel nut 3 times with different torque values. The first one has ...
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125 views

What replacement wings are available for old F-16s?

Eventually, material fatigue will force any aircraft to either be grounded or have its wings rebuilt, or replaced. And please, correct me if I'm wrong. For the F-16, if one were to replace its wings, ...
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4answers
12k views

Why do military jets sometimes have elevators in a depressed position when parked?

Why do they have elevators in such a position as if the joystick is pushed forward, even though there's nobody inside the cockpit?
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1answer
158 views

What is the correct technique for working on an airframe with a pneumatic rivet gun?

I currently work as a trainee AME and want to eventually start specialising in sheet metal / composite repairs as I've heard the money is really good for these specialist skills. I've bought myself a ...
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1answer
193 views

Exceeding VLO and by how much is too much?

Piper Seminole (PA-44-180) VLO (max gear retraction speed) is 109 KIAS. I've heard that manufacturer published limitations are significantly lower than actual structural and system limitations. What ...
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4answers
10k views

How are aircraft depainted?

There are several questions about livery changes and livery in general on this website. Yet, I fail to find information about paint removal. As a routine maintenance for an airframe that can live for ...
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2answers
4k views

Do multi-engine jets need all engines with equal age to reduce asymmetry in thrust and fuel consumption arising out of deterioration?

Let's assume, one of the engines on a twin-jet needs replacement and the jet is is fitted with an old engine and a newer engine after the due replacement, the older engine would tend to produce less ...
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116 views

How long do I have after graduate to take the FAA A&P exams?

2 years ago I went to a college for FAA A&P and graduate but I didnt go and take the written, oral and practical exam. My question is there a time limit after I graduate to take those exams? And ...
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222 views

Altimeter shows 100 foot drop when power is added. Is this a leak in the static system or broken altimeter and how long will the fix take?

My instructor and I were preparing for my Private Pilot Check ride today when we noticed that the analog altimeter would suddenly lose 100 feet when we added power. The only way I can think to ...
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Can a closed Airworthines directive get reopened by a new revision?

There is an Airworthiness Directive that has been closed by accomplishing its terminating action. But there's a new revision that changes the terminating action. Do I have to comply with the new ...

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