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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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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 ...
28
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3answers
3k views

What are the typical facets of ownership costs, for a single engine aircraft?

It's easy to go online and look at prices of a Cessna 172, but what are some examples of how to break down the real world costs of ownership? How much other maintenance should you plan for? How much ...
20
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1answer
31k views

What is the difference between Hobbs Time and Tach Time?

Over in this answer there's a description of Hobbs Time versus Tach Time, and how the Hobbs counts hours while the tach time is equivalent to "hours at cruise RPM". How do these two "clocks" work, ...
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5answers
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How are off-wing jet engines transported?

One of the optional services in Rolls-Royce TotalCare is "Engine Transportation" This service includes routine transportation of engines between the customer’s main base (or designated station) and ...
23
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5answers
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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 ...
21
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3answers
20k views

What happens when the logbook of an aircraft is lost?

If the logbook for an aircraft is lost, how does one replace it? Is the airplane still airworthy?
11
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5answers
7k views

Is there any limit by FAA on the age of aircraft to be operational?

Is there any restriction by FAA that one can not fly a plane older than 'X' years? If someone is maintaining an older plane (e.g. from 1990s), are there any regulations which prevents or restricts ...
11
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3answers
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How much lag does an Attitude Indicator experience?

How much lag does an Attitude Indicator exhibit when it is working as designed? Other than well-known problems like tumbling beyond certain limits in pitch and roll, and precession errors from the ...
32
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9answers
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Why are dirt and bugs on an aircraft so bad?

It's noted in many POHs to keep your aircraft clean all the time, but is there a reason to this? Dirt hardly add any sort of weight to the aircraft, bugs are extremely small and other things such as ...
15
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6answers
4k views

Why are older airplanes still in use?

It is normal to see older planes (20+ years) quite frequently. In fact, a few months ago I saw a plane over 50 years old (not in a museum but on a runway, about to take off). Comparing to cars, there ...
22
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2answers
4k views

How often is a passenger jet aircraft painted?

I just read an article (published in 2012) telling the special livery for British airways' A320 to celebrate the Olympics game is made to last one year. I assume this mean those aircraft are painted ...
20
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3answers
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Why is the aircraft boneyard in Tucson, Arizona still active?

I understand that an aircraft boneyard is an amazing tourist attraction for aviation enthusiasts. However, the number of planes that the boneyard in Tucson has accumulated today is mind-boggling. I ...
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4answers
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How do airlines dispose of a passenger jet when it's no longer airworthy?

When a plane is finally considered to not be airworthy, what happens to them? Do they take them apart bit by bit? Do they sink them offshore to make them into reefs? Are parts stripped and sold as ...
17
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3answers
13k views

How much does it cost to give an airliner a fresh coat of paint?

Just a random thought I had: the weather gives a jet's paint job a battering; meaning they need to be resprayed approximately once every 5-10 years. (See How often is a passenger jet aircraft painted?)...
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3answers
13k views

What is the MEL (minimum equipment list)?

What is a minimum equipment list for an aircraft? How are MEL and MMEL related? Who creates the list, and how do they decide what is on it?
40
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1answer
10k views

Why is tape being applied to this jet engine?

When I read this question asking for identification of the aircraft, my immediate question was: What is that duck tape for? Whether you call it duck tape or duct tape, why is it being applied to the ...
9
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2answers
1k views

Who decides an aircraft's maintenance schedule?

I've found a 737 maintenance planning data document produced by Boeing, which gives a suggested schedule on page 6. I've also found a British Airways Fact Book document, which on the last page gives ...
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3answers
1k views

How is a turbine engine rotated for starting and inspections?

I'm doing an assignment for my Level 3 Aeronautical Engineering course and stumbled on this question and I can't seem to answer it (we have had no teacher for 4 months and therefore we have to learn ...
6
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4answers
1k views

Has a commercial passenger airliner ever had its cockpit fully upgraded?

In an earlier question What are the barriers to feasibility of stratospheric cruising for commercial air travel? (i.e. Concorde?) it was suggested that Concorde was not properly maintained as its ...
6
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1answer
4k views

How are “Owner-Produced Parts” handled under FAA regulations?

FAR 21.9 provides the ability to install parts that were "Produced by an owner or operator for maintaining or altering that owner or operator's product". This seems like a pretty broad scope of ...
21
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4answers
3k views

How do you repair a grounded aircraft at a remote location?

If a large passenger airliner needs repair at a remote airport without services, are there "flying repairshops" that can swoop in and do the work on site?
12
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1answer
1k views

What is an Airworthiness Directive?

Aircraft which have been in service for a long time often have a lot of entries in their logbooks for Airworthiness Directives (ADs). What are they, and why are they important?
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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, ...
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?
4
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1answer
674 views

Is it possible to re-engine aircraft with different engine options?

Most airliners have multiple engine options and so I was wondering if it would be possible for operators to fit a different engine type to their existing aircraft; let's take for instance the Boeing ...
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1answer
4k views

Why are aircraft coloured in yellow during construction, repair or overhaul?

Why are aircraft usually coated with "yellow", while either during construction or repair and overhaul? What exactly is the purpose of it?
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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 ...
13
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2answers
4k views

How does maintenance differ for military fighters/bombers vs. commercial airliners?

And why do military fighters/bomber require so many maintenance hours compared to commercial airlines, which seems like just kicking the tires? What do they actually do? How does maintenance differ ...
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 ...
11
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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 ...
10
votes
1answer
606 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 ...
10
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2answers
4k views

What are the aircraft requirements to legally offer commercial sightseeing flights in a C-172?

When I retire in a couple years I want to fly my 172 and make some money. Even if I just break even that's ok. My CFI certificate has expired and I don't want the hassle of having it re-instated. I ...
10
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4answers
2k views

Are an aircraft's nuts and bolts generally either all Imperial or all Metric, or can they be mixed?

This is a low-tech question, but I was wondering about the distribution of imperial vs metric hardware on aircraft. When current commercial aircraft land at major airports, a mechanic will know ...
9
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2answers
1k views

Are lockwires still preferred over self-locking nuts and other ways of bolted joints` safety?

I've watched some of the lockwiring videos and if I understood it right then there are two most widely used ways of ensuring that a bolted joint does not get loose: Lockwire Self-locking nuts ...
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?
7
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5answers
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How does skydiving flight cause shock cooling?

While answering this question (How can reducing power too quickly on a piston engine damage it?), barit1 said that: Skydiving planes see a LOT of shock cooling, and they pay for it at overhaul time ...
6
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2answers
3k views

Can I work on aircraft without an A&P license?

Can I work at a place where I pull parts, drop engines, hang engines which get sold back into the aircraft market? Am I allowed to do so without a A&P License? I've been told that it is legal if ...
5
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3answers
1k views

How is risk managed in single engined piston aircraft flights?

I have already read this post: How dangerous is flying in a single-engine plane? Recently as reported in the NTSB accident database, a pilot of a light aircraft encountered engine failure after take ...
3
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1answer
117 views

Where can I find standard aviation abbreviations for the “unit of measure”?

I have been in the aviation industry specialising in Logistics all my life. There used to be a standard, the ATA 200, for how to abbreviate the unit of measures, such a EA for each, KG for kilograms, ...
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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 ...
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 ...
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 ...
10
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1answer
1k views

What should I look for / check during an oil change?

Piston aircraft engines require regular oil changes, and at least in the US it's something the FARs allow an owner with a private pilot certificate to do. What are some of the things I should look ...
10
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4answers
3k views

Why does the BAe 146 have higher maintenance costs than other comparable jet aircraft?

In many discussion(1)(2) it is stated that the BAe 146 has higher maintenance cost and higher cost of operations in compare to other jets due to its complexity. Quoting IslandHopperCO (Reply 21): ...
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3answers
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Are task cards still used in aircraft maintenance?

I used to work for a company making maintenance software for the shipping industry. Each component, from a cylinder in an engine to the furnace has to be inspected after (e.g.) 10,000 running hours, ...
8
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1answer
2k views

Are there differences in tool standards between aircraft manufacturers?

As a follow up to "What is the measurement system used in the aviation industry?" which specified about measurement units during operations, another question that comes to my mind is: are there ...
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 ...
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3answers
964 views

How feasible is BAE Smart Skin?

I just came across this article on LinkedIn, and I have a few questions about it. Some of BAe's claims are things such as: Aircraft set to become more human as engineers develop smart skins which ...
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1answer
436 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 ...
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, ...