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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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28
votes
5answers
51k 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 ...
29
votes
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
votes
1answer
34k 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, ...
15
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5answers
5k views

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
votes
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 ...
5
votes
3answers
18k 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?
23
votes
5answers
8k 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 ...
20
votes
3answers
23k 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?
20
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4answers
16k 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?)...
11
votes
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 ...
5
votes
3answers
6k views

How many antennae are there on a typical small aircraft, and how are they connected to the avionics?

As far as i know there are a bunch of antennas on board of a small (EASA CS-23) plane: GPS is for GPS navigation in MHz VHFVOR is for NAV and Glideslope/Localizer ADF is for ADF DME is for DME ...
11
votes
3answers
4k views

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
votes
9answers
8k views

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
votes
6answers
5k 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 ...
20
votes
3answers
7k views

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 ...
18
votes
4answers
1k views

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 ...
14
votes
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?
40
votes
1answer
15k 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 ...
7
votes
1answer
5k 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 ...
10
votes
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 ...
7
votes
3answers
2k 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
votes
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 ...
21
votes
4answers
4k 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?
9
votes
2answers
7k 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
votes
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
votes
1answer
1k 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 ...
31
votes
1answer
5k 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?
25
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6answers
6k views

Why would a C150 tachometer bounce so much that the needle fell off?

On a long flight in a C150E, the tachometer started bouncing a little bit and the severity of the bouncing gradually increased until it was extreme: The tachometer was spinning in loops and making a ...
34
votes
7answers
7k 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 ...
5
votes
3answers
2k 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 ...
5
votes
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) ...
14
votes
3answers
11k 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 ...
13
votes
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 ...
12
votes
5answers
9k 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 ...
12
votes
4answers
3k 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 ...
11
votes
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
votes
1answer
716 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 ...
9
votes
2answers
2k 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 ...
8
votes
2answers
568 views

Will manually removing nicks from compressor blades significantly affect the operation of the compressor?

I've recently found a channel on Youtube where a jet engine technician goes into great detail about the work he does on maintaining and repairing jet engines In this particular video (and also an ...
7
votes
1answer
2k 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
votes
5answers
2k views

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 ...
7
votes
2answers
5k 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 ...
6
votes
2answers
4k views

May pilots perform FMS database updates under Part 135?

Are pilots allowed to perform FMS database updates under part 135? If so, do they need formal training entered in their pilot records before they are allowed to do it?
3
votes
1answer
123 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, ...
16
votes
2answers
677 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
votes
3answers
5k 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
votes
2answers
447 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
votes
3answers
9k views

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, ...
10
votes
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): ...
10
votes
1answer
2k 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 ...