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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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1answer
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Would it be possible to economically repair 9V-SWB? [closed]

Damage suffered by the right wing of 9V-SWB, a Boeing B777-300. The complete incident details could be found here. My question is, would it be possible to repair this aircraft economically, so that ...
16
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2answers
3k views

What are these aircraft at AMARG? Why are they dismantled this way?

At the AMARG boneyard (Tucson desert, Arizona), there are tons of aircraft, but a limited number of models are dismantled according a special way: wings or tail or both separated from the fuselage: ...
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2answers
2k views

What, exactly is “on the MEL”?

The MEL, minimum equipment list, defines whether fault of some equipment on the aircraft prevents it from being dispatched for flight or not. However, sometimes (e.g. in comments to this question) ...
6
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1answer
477 views

Can the MEL be equal to MMEL?

I am performing a review of aircraft maintenance. i intend to reconcile the MMEL for airbus 320 along with the operators MEL. Based on my information, the MEL is supposed to be more restrictive than ...
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5answers
2k views

Can an aircraft owner legally replace an oil quick drain valve?

The quick drain valve on our older Mooney has started leaking and making a bit of a mess. We went to our local shop to asked them to schedule to replace it for us and they told us they are booked out ...
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2answers
646 views

How much weight does removing a vacuum system really save?

For a small GA aircraft (e.g. Piper, Cessna, Mooney), does anyone have a before and after weight savings example from removing a vacuum system? E.g. calculated weight of component removal during W&...
4
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1answer
693 views

Are there any guidelines on airframe age and metal fatigue in light aircraft?

Are there any guidelines or rules of thumb about when airframes become affected by metal fatigue? More specifically, is something like a 1950s vintage Cessna still safe, or should I be worried about ...
4
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0answers
880 views

What is “one flat movement” of a screw on the fuel control unit?

I'm looking to do a N1 low idle speed adjustment oa King Air B350 with the PT6A-60A engine. There is a note saying that one flat movement of the low idle speed screw in the FCU increases N1 by 3.5% ...
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1answer
5k views

Is TBO an airworthiness item or just a recommendation?

In browsing Trade-a-Plane for my dream (light GA) ride, I often note the TBO (Time Before Overhaul) for an aircraft in relation to its asking price. Obviously, the more time left before an overhaul ...
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1answer
254 views

What does a jet engine technician do? [closed]

I know that they repair everything that concerns engines, but what is the actual day for them. Do they sit in the factories or work in airports?
10
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1answer
639 views

Components on engines, are they removed or blanked out?

As a follow up to why doesn't the A380 use outboard thrust reversers, if a component is not used in an engine, is it completely removed (hardware, wiring etc etc) or is it just made inoperative? In ...
6
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1answer
565 views

What is a G-Check and what are the differences relative to other checks?

Tried looking for a definition on wikipedia for a G-Check. The wikipage only mentions A,B,C,D checks. Any ideas what a G-check exactly is? I think I found an article stating it is a 7500 hr major ...
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5answers
7k views

Could most commercial jet engines today run on ethanol without any problems?

Most commercial jet engines today would be those large jet engines on large passenger craft like a Boeing 747. Can these run on straight ethanol without any problems? Would more maintenance be ...
3
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1answer
447 views

What are good study guides/practice tests for the airframe maintenance certificate?

I am approaching my 18 month mark on the job. Wanting to get my A license first. I have done all kinds of airframe work in this time period. Wondering if anyone has suggestions for the names of the ...
7
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1answer
1k views

Why are these rivets on the 777 so visible?

Look at this 777 nose: Source: Airliners.net It is full of rivets.Why are they so visible on this particular aircraft? Why doesn't the radome have rivets?
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4answers
8k views

How is metal fatigue detected in an aircraft?

There have been many accidents involving metal fatigue. How do the engineers, maintenance team, etc. know if an aircraft has metal fatigue? What is done to "minimize" metal fatigue or repair it?
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2answers
201 views

Do aircraft manufacturers have the authority to either approve or disapprove the maintenance procedures of its customers?

Having currently read this article in Wikipedia, linked through Reddit, regarding American Airlines Flight 191, which crashed due to maintenance issues. Inside the article, it says McDonnell-...
10
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2answers
906 views

How can one determine if a Service Bulletin is still applicable?

I've seen the occasional Service Bulletin that is marked Obsolete, and others that Supersede SB-123. If I'm a pilot or A&P looking through logbooks, what resources are available to determine if a ...
5
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1answer
345 views

Wingtip landing light lenses are hazed - what can I do to make them clear again?

I have wingtip landing/taxi lights on my plane. They have acrylic covers to protect the bulbs. They have started to haze over time, similar to the effect of car headlights. I am wondering if anyone ...
13
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3answers
4k views

What should I wash my plane with?

What should I wash my airplane off with? As a new aircraft owner, any help would be appreciated. I am pretty sure using dish washing detergent is not the best here as we are told not to use the ...
10
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2answers
948 views

I need to clean my aircraft's windows - what do I use?

I need to clean my aircraft's windows what do I use? Note: I hope this is not a "subjective" question, as I don't want to put a potential harmful substance on my aircraft's windows and as a new ...
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4answers
10k views

How do I determine the center of gravity on aircraft?

What are the parameters considered and what formulas are used to find the Center of Gravity on an aircraft?
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1answer
628 views

What are the advantages of electrical systems over pneumatic systems?

What are the advantages of using electrical systems as a alternative to pneumatic systems in the Boeing 787-9? Is it a maintenance advantage?
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2answers
1k views

Is it possible to change/repair an aircraft tire while in flight?

Consider the following scenario: A crew experiences a flat/burst tyre above V1. Is it possible, in some type of aircraft, to change it while in flight? This might include, but not limited to: ...
10
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1answer
2k views

What are these “lines” on the A319 flaps, are they damaged?

I've noticed a grey line on the flaps of the A319: What is that? Source
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2answers
973 views

How are fan and compressor discs balanced?

@curious-cat brought up an interesting question on another thread. How are the fan discs, compressor spools and turbines balanced on a jet engine. As they wear they surely get out of balance. Do they ...
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1answer
3k views

What is 'blending' for a turbine blade?

What is the process of 'blending' that is used as part of jet engine maintenance?
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1answer
705 views

why standard wrenches are sized like 1“,15/16”,7/8“,1/4” etc? [closed]

There is a belief that wrench size is the across the flat distance of a bolt head/nut. any reason other than this for designing wrenches in these standard sizes?
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3answers
9k views

Can I work on my own airplane without formal mechanic's training?

Suppose I am not planning to be a career A&P mechanics, but would like to get some hands-on skills for airplane maintenance, for reasons of both cost and hobby. Say my basic goal is to perform ...
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1answer
442 views

Are the N1 and N2 tachometer generators installed on 727 / JT8D engines line replaceable units?

Each JT8D engine on a 727 has two tachometer generators as part of the engine tachometer system to measure N1 and N2 speeds. Are these generators line replaceable units? How long would replacement of ...
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1answer
5k views

Hobbs vs Tach time? [duplicate]

Other posts didn't answer my question. In A&P school months ago they told us the difference and can't find where I wrote this down. One of them was used to find engine time and the other was used ...
5
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1answer
181 views

Can you help me to identify a Boeing 727 maintenance task involving a safety risk for a research project?

I need help identifying a Boeing 727 maintenance task that would be suitable for a research project on improving maintenance instructions. Ideally, the task should meet the following criteria: - the ...
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4answers
1k views

How do airlines manage routes when respective aircraft undergo B,C or D checks?

While playing some airline management simulation games, I found all these checks to be some real kind of mess. If suppose I have a fleet of about 10 A-320s then if one them goes for any check, then I ...
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1answer
357 views

How to remove clogging in aircraft fuel nozzles?

I have a dual orfice fuel nozzle (Used in CFM56 Engine/ Parker make). The secondary orifice is not opening up even at the required injection pressure. It had been not used for 3 years and I assume ...
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3answers
480 views

Could a fighter aircraft be operated indefinitely?

Is it possible for an air force to operate a fighter aircraft indefinitely? Suppose a country has some Mig-21s or Mirage-IIIs. Is it possible for them to operate those aircraft indefinitely by ...
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2answers
6k views

Which aircraft maintenance repairs require a test flight?

14 CFR 91.407 requires an "Operational Check Flight" of an aircraft before passengers may be carried in certain situations: §91.407   Operation after maintenance, preventive maintenance, ...
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3answers
530 views

Why should a test flight should be performed when the propellers are changed?

From this question I've learned that after a propeller change the plane should go through a test flight. Why is this?
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1answer
92 views

What are the services that MROs provide for corporate jets (private jets)? [closed]

What are typical Costs/Rates of Private(corporate jets) MRO Services in the Middle East/North Africa region?
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2answers
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What are the differences between third-party base maintenance, line maintenance and component maintainance?

These are related to MROs(Maintenance, repair and operations) activities ?
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1answer
1k views

What are the advantages/disadvantages of ultrasonic in aircraft structure inspection?

What i mean by structure is (different composite materials and aluminum). What are the cons in terms of time required to test the full body of the aircraft (B747 for example) in C and D checks ?
4
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1answer
363 views

Why isn't aircraft structure inspection done by robots? Is there any known active research on the subject?

From my research I've found that (correct me if i am wrong): Structure inspection (in B,C and D Checks) including (visual, thermography, ultrasonic inspections) looking for structure damage of ...
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2answers
1k views

How does a full fuselage and structure inspection happen in practice ? (for modern Civil airliners)

What are the intervals at which a full structure inspection take place ? How much time does a test commonly take for narrow and wide body aircraft ? Is every part in the structure manually ...
5
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1answer
194 views

Does Active Thermal Imaging (NDI method) detect all types of structural faults in modern civil aircraft?

What are the weaknesses of Active thermal imaging in NDI of different composite materials used in aircraft structure ? How much time and effort does it take to complete a full structure inspection ...
2
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1answer
986 views

Who can perform different maintenance checks?

The different types of check (A-check to D-check) require different types of competence and certification. If I understand correctly, D-checks require special equipment and certification and some ...
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1answer
342 views

which part of aircraft maintenance or inspection that could be automated to avoid maintenance error? [closed]

According to my search: Almost 12% of all aircraft accident reports cite a maintenance factor. source
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1answer
464 views

How much time does it take to calculate the leveling and weighing of big and small aircraft?

What methods are used to achieve that? According to my search : For old planes they use a plumb bob and measuring tools. On new and big planes, the process is computerized. Built-In Electronic ...
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3answers
593 views

How is the amount of time for an A check or daily maintenance determined?

How can the time for daily maintenance or A Check be calculated for different aircraft types? Is there any exact formulation depending on the aircraft specifications? P.S.,I'm very new to the ...
2
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1answer
265 views

Can a non-A&P fabricate and install his own hydraulic lines?

As a non-A&P, am I allowed to fabricate and install hydraulic fluid lines as part of preventive maintenance on an aircraft?
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1answer
1k views

How are different parts of airliners handled after the end of life-cycle? [duplicate]

When I was young my father opened a ship equipment shop. He purchased the broken airliners wheel and resell to the ship operators as anti-crash barrier on ship or in the pier like in the picture. How ...
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7answers
6k views

Do any aircraft carry spare parts for making repairs?

I was curious to know, are there (or were there) any aircraft that regularly carry spare parts to be used for replacement or repairing the aircraft itself? If so, what are those spare parts? I'm not ...