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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.)

10
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2answers
799 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
9k 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?
3
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1answer
598 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?
2
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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
8
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1answer
769 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 ...
5
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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?
-2
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1answer
661 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?
13
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2answers
8k 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 ...
1
vote
1answer
416 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 ...
-2
votes
1answer
4k 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
votes
1answer
177 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 ...
13
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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 ...
2
votes
1answer
338 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 ...
2
votes
3answers
476 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 ...
9
votes
2answers
5k 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, ...
2
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3answers
528 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?
0
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1answer
91 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
4k views

What are the differences between third-party base maintenance, line maintenance and component maintainance?

These are related to MROs(Maintenance, repair and operations) activities ?
1
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1answer
917 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
votes
1answer
359 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 ...
2
votes
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
votes
1answer
189 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
votes
1answer
921 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
330 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
5
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1answer
458 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 ...
1
vote
3answers
545 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
votes
1answer
257 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?
7
votes
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 ...
34
votes
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 ...
7
votes
1answer
225 views

What can I be allowed to do as a engineering/ maintenance intern at a european airline?

I am just about to (hopefully) embark on a short internship at the maintenance department of a medium-sized european airline (i.e. under EASA framework). While the internship has been pushed towards ...
0
votes
1answer
931 views

What are the specs for runways at international airports? [duplicate]

1) What are the materials that international airport runways are made of? If runways consists of several layers, what are they made of, and what is their depth and other specifications? 2) What are ...
11
votes
5answers
7k views

What are the requirement for electrical grounding of aircraft in hangar storage?

When an aircraft is being stored in a hangar between flights, are there any requirements to have the aircraft connected to an earth ground? I believe that there is (although I'm looking for the ...
3
votes
2answers
2k views

What is the minimum distance between two civil airplanes parked in a hangar?

When parking two airplanes in the hangar, what is minimum safe distance between them?
16
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2answers
567 views

What's the inspection/repair procedure following damage from severe hail?

Delta 1889 was forced to make an emergency landing last Friday (August 7th, 2015) after being battered by hail in a severe thunderstorm. The picture in the news shows the two leading segments of the ...
12
votes
1answer
3k views

How much does a D-check cost compared to a new aircraft?

As I understand from those videos, a D-check basically consists in disassembling the whole aircraft, inspecting every little piece, and then reassembling it. For me, the last part seems to be more or ...
4
votes
1answer
283 views

Am I allowed to replace my own Model A-30 Altitude Digitizer?

My Transponder Mode C (Altitude Reporting) function quit working. The position reporting function is working fine. I believe the failed component is the self contained Model A-30 Altitude Digitizer "...
1
vote
1answer
242 views

What design feature prevents the fuselage skin from completely tearing off?

For an example, I am talking about the Southwest Airlines Flight 812 where there was a small tear in the fuselage section caused as a result of metal fatigue. Why didn't the tear affect other ...
3
votes
1answer
378 views

How do I paint an airplane with an electrostatic paint gun?

I have a Cessna 150 which needs a paint job. As I have experience in painting objects with a spray can, and also in stripping airplanes, I am thinking to paint the Cessna myself. What are the ...
11
votes
1answer
3k views

Does it matter in which country I obtain my EASA Part 66 AME licence?

I have completed EASA Part 66 B1.1 exam modules (some from the UK CAA and some from the German 147 organisation). My queries are: Can I apply to any member state (e.g., Belgium, The Netherlands, ...
7
votes
1answer
5k views

What are Electro Hydraulic Servo Valves and Solenoid Operated Valves?

What is Electro Hydraulic Servo Valve (EHSV) and Solenoid Operated Valve (SOV)? Also what is the difference between these two valves? Basically, these two are used to control the hydraulic fluid in ...
7
votes
1answer
585 views

What is high altitude testing?

When new engines are designed for aircraft (military or civilian) they undergo high altitude testing (especially the military ones). What is high altitude testing of engines? How is that important?
9
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2answers
4k views

How should the number of maintenance hours per flight hour for the C-17 be interpreted?

While reading up on the Boeing C-17 Globemaster III, I came across a reference to its maintenance man-hours which surprised me. As listed in the spec sheet (emphasis mine): These requirements ...
7
votes
3answers
804 views

Do older aircraft require increased general maintenance?

Does the age of the aircraft increase the aircraft's maintenance expenses, fuel consumption, and electrical shorts? If so, by how much? And is this a reason why planes get scrapped?
2
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1answer
155 views

Do anti-collision lights in aircraft lose intensity over time?

Do anti-collision lights installed in aircraft lose their intensity over time and need to be replaced every few hundred hours of operation?
6
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1answer
2k views

Why does ETOPS not apply to older 4 engine aircraft?

This is a follow-up to my previous question: What is ETOPS and how does it work? There is a related question here, but it does not specifically answer this new question. Facts: Since February 2015, ...
28
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5answers
41k views

What is ETOPS and how does it work?

According to this press release by Boeing earlier this year, the 747-8 has received its ETOPS 330 rating. This is required by all 4-engined planes made after February 2015 to fly beyond 180 minutes ...
13
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2answers
430 views

How to replace two propellers on the same aircraft reaching the time limit?

When both propellers of the aircraft reach the time limit (60 month) and need to be replaced, can both propellers be replaced at the same time and perform only one flight test to reduce time on ground ...
3
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2answers
12k views

What is an Aircraft Overhaul?

While reading the FAA presentation on Part 135 Airworthiness Requirements, on slide 7 where it discusses maintenance, the list includes inspection, overhaul, repair, preservation, and the ...
4
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1answer
149 views

Do aircraft technicians need additional certifications to work in other countries?

Professional technicians, who work in aircraft maintenance, usually obtain some sort of national certification, right? Let's suppose someone got training and certification in one country, and wants ...