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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.)

2
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2answers
169 views

Are Final Tests always required for LRUs?

Is an aviation component workshop allowed to release a line-replaceable unit (LRU) without going through a Final Test, if the LRU passes the pre-testing procedure and is found to be a No Fault unit?
1
vote
1answer
361 views

Can an engine that is extinguished by foam be returned to service?

During the Qantas 32 accident, one of the engines could not be shut down as the control cable from the cockpit to the engine is cut. The fire crew eventually shut down the engine by shooting fire-...
3
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1answer
146 views

What modifications are necessary to the airframe and or instrument panel to add an autopilot to a light airplane (like a Cessna 172 or 182)?

If you were going to add an autopilot to a light airplane that never had one, what all needs to be done? I know they need to connect servos somewhere (where exactly), and add instrumentation to the ...
2
votes
1answer
351 views

How are individual rotor/stator blades identified during engine inspection for the CFM56?

During the inspection of fan, compressor and turbine blades, what is the method of identification? For example during borescope inspection, what is the mode of identification of stator and rotor ...
5
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4answers
533 views

I overboosted an engine in a Mooney 231 - do I need to do an inspection?

I have an intercooler, but no wastegate. Manifold pressure was not controlled on takeoff and went to 50. The max is 37! If overboosting doesn't really exist because the relief valve opens, then how ...
1
vote
1answer
177 views

When does a turbine need to go to maintenance?

I'm wondering what the limiting maintenance factors for engines, for example of an A320, are. Of course this is something that is different from one engine manufacturer to another and especially from ...
8
votes
4answers
332 views

Why has the range of movement of the control surfaces changed over the past year?

During the annual inspection on our glider, we discovered that the maximum downwards extension of the right aileron (i.e. full left stick) was outside the manufacturer's tolerance. The measured value ...
13
votes
3answers
770 views

Is the old paint removed before applying a new one?

I've heard that paint on large airplanes weigh 250+ kg. When an aircraft gets a new owner, do they remove the paint that was previously on or simply paint over it? If it is removed, how is it ...
7
votes
1answer
380 views

Do modern jet engines monitor and record exposure to particles of dust or sand?

The BBC News article The Jet Engines with Digital Twins describes engineers monitoring measured versus modeled behavior of jet engines, and deviations between them signaling possible need of ...
2
votes
0answers
166 views

Where can one access the electrical buses in an aircraft? [closed]

I am looking at how new systems are retrofitted in aircrafts (large business jets or airliners), and I was wondering where the mechanics can get access to electrical power. More specifically, I know ...
14
votes
2answers
5k views

What's the reasoning for safety wire on aircraft, and the reasoning behind the way it's routed?

I'm assuming saftey wire is used near propeller assemblies where a lot of vibration occurs, or where the different speeds and altitudes aircraft are at could cause expansion or contraction based on ...
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1answer
462 views

Can the two female belts in Jurassic Park be anything else but a wrongly installed belt?

In Jurassic Park, when the party arrives on Isla Nublar, Dr. Alan Grant discovers his seat belt has two female ends. He makes it work, foreshadowing that in nature as well, a population of only ...
2
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2answers
541 views

Why are ethanol piston engines apparently cheaper to maintain than avgas piston engines?

In the course of hunting for examples of 100% ethanol-powered piston engines, I found the Embraer EMB 202 from Brazil that is modifiable to be that way. But the article also says "The alcohol fuelled ...
11
votes
1answer
520 views

What is this substance on these pipe fittings?

In this picture from a different question I noticed some kind of colored substance across many of the fittings. It is in several different colors and looks like it might be sticky. (The pink kinda ...
6
votes
1answer
767 views

How many types of tape do airplane mechanics use?

I was reading this blog linked from this answer, and it mentions “We never use, and don’t even stock, duct tape,” explains a veteran airline mechanic. “Some of the tapes we use cost hundreds, ...
40
votes
1answer
11k 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 ...
3
votes
1answer
528 views

What is the function of this small hole on the B737's hydraulic reservoir line?

This is picture of a B737-800. When you open the bleed system a small amount of air is discharged from this hole (marked with an arrow, lower right). What is it for? And what happens if this hole gets ...
9
votes
3answers
2k views

It is possible for an airplane to get infested by animals?

Is it possible for an airplane to become infested by animals like mice or rats? Is it possible for them to survive? Do airliners do anything to prevent a scenario like this? Has it ever happened ...
4
votes
0answers
258 views

What is the most commonly occurring fault with this type of electrically driven gyro?

I have an examination tomorrow about advanced avionics systems (EASA module 13) and we are required to troubleshoot a fault with the compass system. What is the most commonly occurring fault with a ...
1
vote
0answers
368 views

Can an avionics technician work on Part 91 aircraft after a failed drug test?

I am trying to find out if it is legal to perform maintenance on small Part 91 aircraft performing avionics and electrical airframe repairs if I have failed a follow up drug test while employed by a ...
0
votes
1answer
627 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
votes
1answer
324 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 ...
4
votes
2answers
351 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
votes
1answer
424 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 ...
2
votes
1answer
407 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 ...
10
votes
1answer
887 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 ...
7
votes
2answers
4k 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
votes
1answer
3k views

How often are heavy aircraft brake pads changed?

How often are Boeing 747-800 and Airbus A380 aircraft brake pads changed?
2
votes
2answers
334 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.
3
votes
0answers
333 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
votes
1answer
380 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 ...
8
votes
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 ...
1
vote
1answer
408 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 ...
9
votes
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 ...
-2
votes
1answer
254 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.
2
votes
2answers
944 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.
3
votes
1answer
438 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
votes
2answers
539 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 ...
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 ...
12
votes
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
votes
2answers
176 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
votes
1answer
316 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?
1
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2answers
272 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?
2
votes
1answer
178 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 ...
7
votes
4answers
799 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 ...
5
votes
2answers
384 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., ...
1
vote
1answer
365 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 ...
3
votes
1answer
118 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, ...
8
votes
1answer
824 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 ...
4
votes
2answers
528 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?