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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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588 views

How do turbofans and piston-engines compare in terms of maintenance costs?

I want to compare piston engines and turbofans on a maintenance basis. Let's say both engines are capable of 100 kN of thrust. Let's say both engines fly for 10,000 hours. Over that time, what kind ...
5
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1answer
303 views

How do I modify the aircraft weight and balance after a battery replacement?

I am looking to replace my Gill battery with a Concord. The regulations appear to allow me to do this as an owner. However, the Concord battery weighs 2 lbs more. I cant find it in the regs if I ...
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2answers
322 views

When buying an aircraft which has had multiple owners it is acceptable to get the logbooks from the previous owner only?

I know of a case where a small GA aircraft has had three owners since it was manufactured. However the only airframe, power plant and propeller logbooks available for the airplane are from the most ...
12
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1answer
419 views

How did the US get the necessary knowledge to maintain their MiGs?

I read a book entitled America's Secret MiG Squadron by Gaillard Peck some time ago. Just occurred to me though, how exactly did the US maintain these birds? Did we write any tech data? Did we acquire ...
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1answer
390 views

What may cause a strong smell of paint thinner like odor and no power to master in a Piper Warrior?

I am sitting in the hangar with my Piper Warrior II sitting outside. The battery is completely flat and the cabin smells like paint thinner. This is the first time that this has occurred and if ...
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1answer
883 views

Is there a common maintenance issue requiring filling a hole in the tail on the A321?

I was on a flight recently (AA 705) and a maintenance worker used a forklift to go on top of the plane shortly before the captain announced that we were going to have to wait at the gate for an extra ...
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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 ...
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1answer
2k views

How often are heavy aircraft brake pads changed?

How often are Boeing 747-800 and Airbus A380 aircraft brake pads changed?
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2answers
318 views

Are there any known maintenance issues with older Mooney wooden wings?

Are there any maintenance issues or ADs for the older Mooneys with wooden wings? I'm looking at a 1958 M20A (always hangared) and I'd like to know if there are specific points to check.
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0answers
301 views

What jobs are available for a person on the autistic spectrum with ADHD? [closed]

For a young man who has Autism and ADHD and considered high functioning ( cognitive and processing difficulties but very social ) what types of " hands on " jobs are there for him in the aviation ...
3
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1answer
311 views

Who can carry out airworthiness inspections?

My understanding is that aircraft regularly have inspections for defects just like cars in the U.K. have an annual MOT test to check their condition and safety. My question is, who can do these ...
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1answer
5k views

What is the difference between a functional check and an operational check?

Can anyone explain what is the difference between a functional check and an operational check in aviation? Basically I faced a problem to prepare the task card for functional and operational check of ...
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1answer
354 views

What is the benefit of upgrading Flight Management System to version UNS-1Ew? [closed]

I am working in a private airlines. We have some Dash-8 Q400 aircraft in our fleet. Recently a SB has been issued telling us to upgrade the Flight Management System from UNS-1E to UNS-1Ew. Can ...
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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 ...
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1answer
227 views

Where can I find an example of a propulsion maintenance task card?

I'm looking for an example of a task card for aircraft propulsion maintenance, e.g. propeller or engine maintenance. I've found examples for wings and airframes, but not for propulsion.
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2answers
870 views

What is the regulatory definition of AOG?

What is the legal or regulatory definition of AOG (Aircraft on Ground)? For example, this is sometimes stamped on a repair order.
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1answer
389 views

How is the due date for landing gear replacement determined?

I want to know how calculate the due date of Boeing MD-83 Landing gear replacement (it is every 10 year or 20000 FC). Is it calculated from the installed date or shop visit date?
3
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2answers
457 views

Which MEL categories would ground a commercial airliner if they're inoperative?

Which Minimum Equipment List (MEL) categories would require a commercial airliner to be grounded (Aircraft On Ground or AOG) if they're inoperative? For example, any category A MEL item is considered ...
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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 ...
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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 ...
3
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2answers
156 views

Does a flight cycle require a minimum duration? [closed]

For medium/long-haul pressurized airliners that are used on short routes. How is a cycle calculated? Wouldn't the short flights impact the maintenance schedule due to the frequency of pressurization ...
3
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1answer
308 views

Are the Gulfstream III's ailerons controlled by hydraulically boosted cables?

Are the ailerons for a Gulfstream III controlled cables with hydraulic boost? Also, is it possible that an aircraft mechanic could easily access the control to tamper with it?
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2answers
268 views

Who inspects commercial aircraft seats for defects (and when)?

Do inspections of aircraft seats occur only after passenger complaints, or do the major carriers conduct their own inspections at regular intervals?
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1answer
177 views

Do new VHF radios need to be flight tested?

I'm in the process of upgrading all our VHF radios and the local regulator has asked us to follow the guidance/recommendations from ICAO, as we have more or less cancelled many of our local rules. The ...
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4answers
734 views

In general terms, is a Constant Speed Propellor equiped aircraft more expensive to maintain?

I've been looking at possibly buying a used Mooney M20 or a used Cessna 172. One of the big differences between the two is that the Cessna is a fixed prop, and the Mooney is a constant speed ...
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2answers
330 views

What qualifies as a major overhaul?

I have an engine that took a prop strike (previous owner). The engine was completely disassembled to check the crank, case, etc for damage. It was reassembled with new parts, bearings, rings, etc., ...
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1answer
352 views

How reliable are aircraft cutaway drawings from Flightglobal?

I am working on a new system that would be retrofitted on jets (can't talk much about it yet), and I was looking for detailed drawings to start creating its detailed engineering design. I stumbled ...
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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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1answer
742 views

How often is the exterior of airliners cleaned?

Do airlines such as American Airlines or Emirates clean their planes regularly? If so, how regularly? After every flight or at scheduled maintenance points? How long does this activity take? Do they ...
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2answers
498 views

Is there any FAA Regulation who may wash a private aircraft such as Cessna Skyhawk or Citation?

Should it be mandatory to hire a mechanic? or someone else with any kind of FAA license? or could anyone wash one?
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1answer
1k views

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 ...
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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
1k 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) ...
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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 ...
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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
587 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&...
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1answer
621 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 ...
3
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0answers
804 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
242 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?
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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 ...
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1answer
524 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
6k 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 ...
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1answer
390 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 ...
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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
197 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-...
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2answers
808 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 ...
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1answer
332 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 ...
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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 ...