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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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0answers
56 views

Statistically, what are the failure points on sUAS (drone) aircraft?

It is generally recognized that operator error and unairworthy aircraft are the principle factor in sUAS (drone) system failures and accidents. But looking just at the hardware, are there published ...
7
votes
1answer
910 views

Is it allowed to operate an aircraft when the Emergency Locator Transmitter has been removed?

I purchased an aircraft from which the previous owner removed the ELT before I took possession; it was present during the test flight. I need to know what the minimum legal requirements are for a ...
0
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1answer
153 views

How can I troubleshoot an intercom interference issue in a Piper PA-28?

Our Piper PA28-181 doesn't want to let us communicate via its own intercom panel in the dashboard. We connect via the pilot port and an "Intercom SL300". When connected there is a annoying sound on ...
2
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3answers
3k 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 ...
3
votes
1answer
191 views

HSI KG 525 PNI non slaved or only slaved?

I'm in Germany and currently on a project about the avionics of an older airplane (PA28). Here is a link to a former reddit question. My Prof. and me want to update the Avionics now - he asked me to ...
0
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1answer
52 views

Aclad sheet metal P/N 22024T3 [closed]

I am looking for aclad sheet metal P/N 22024T3 2MM, 1.2MM AND 1.6MM 1 SQM each. Anyone could help me locate those? I sent requestes to MROs etc, most do not recognize the P/N which is taken from ...
2
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0answers
820 views

What are the differences between an EASA part-66 license and FAA A&P Aircraft Mechanic License?

what is the difference between EASA part-66 license and FAA A&P Aircraft Mechanic License? Are there any reasons for a company or individual to opt for the one or the other or both?
6
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3answers
541 views

Explain how the infrared flame detector work? [closed]

For fire detection systems, such as for engine fire detection, how does the infrared flame detector work?
2
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1answer
230 views

What does runaway failure mean (position difference between APPU and FPPU) on A320?

I've been reading the description and operation of Flap systems. WTBs will stop and hold the transmission whenever SFCCs receive some failures.
2
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1answer
216 views

Why are thermal switches connected in parallel to each others?

Why are thermal switches fire detection system connected in parallel to each others?
4
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1answer
358 views

What is the best extinguishing agent when wheels catch on fire? [duplicate]

What extinguishing agent must be used in the event of a fire involving wheels/tires? Why?
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2answers
128 views

Is it possible for me to work at NASA or other research companies as aircraft mechanic? [closed]

I know NASA is huge but is it possible for me to work there or other companies similar to it? If possible, how? I currently work at an MRO as aircraft mechanic. My work is mainly on flight controls. ...
2
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1answer
491 views

What are the following documents about aircraft maintenance?

What is a service bulletin? How does it originate? What is a rapid revision in aircraft maintenance? What is a non-conformation report? What is the difference between these 3 documents?
4
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2answers
179 views

How are aircraft lifespans tracked?

When returning from each flight, during which it is subjected to adverse conditions, say arctic weather, desert heat or just moderate conditions, how is an aircraft evaluated to accurately keep track ...
8
votes
2answers
425 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 ...
2
votes
1answer
180 views

Is it okay to use magnetized tools on airplanes?

Let's say you stored your tools on a magnetic organizer in your toolbox, such as the one pictured. Now you go and use a socket or wrench that is slightly magnetized. Have you done wrong?
1
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1answer
167 views

Is there AOG liability?

From Wikipedia: Aircraft on Ground or AOG is a term in aviation maintenance indicating that a problem is serious enough to prevent an aircraft from flying. Generally there is a rush to acquire ...
4
votes
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 ...
6
votes
1answer
198 views

At what age does a regularly maintained airframe most commonly start needing frequent repairs?

I am looking to buy a Cessna 182. I am trying to work out the sweet spot between age and price. I am looking for a plane that will be really reliable. I am looking to spend several months flying ...
7
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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 ...
3
votes
1answer
928 views

American Airlines Astrojet - is it really 'polished aluminium'? [duplicate]

I came upon this article, referring to American Airlines' roll-out of a 737-800 in their Astrojet livery. In the article it describes this as 'polished aluminium'. (Photo supplied by American ...
7
votes
1answer
182 views

Is AD compliance ever physically verified when maintaining an aircraft?

As we all know around here, national aviation authorities put out Airworthiness Directives mandating certain changes be made to aircraft during their service life so that the aircraft can stay ...
7
votes
2answers
392 views

Can a pilot or owner repair a seatbelt?

I have a Cessna 210 with inertia reel seatbelts. The spring coil on the retention wheel broke. FAR 43, Appendix A (C).14 allows for owner replacement of seat belts FAR 43.13.(b) requires that it be ...
5
votes
1answer
402 views

How do I differentiate between different types of installed wire lock/safety wire on planes?

Common wire-locking/wire safe-tying materials used in aviation include copper, stainless steel, Monel and Inconel. Is there any way one can differentiate an installed stainless steel one from an ...
0
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0answers
44 views

May two different component manufacturers have the same component maintenance manual number?

Is it allowed for two different component manufacturer to have the same Components Maintenance Manual number?
3
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0answers
85 views

What is the FAA Approval Basis for an FMS upgrade on a Part 25 aircraft?

Does anyone know of a recent approval for an upgrade from a Universal UNS-xx FMS to a Universal UNS-1Ew FMS on a FAA registered aircraft, other than a TC, TC update or an STC? I am looking for the ...
3
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1answer
295 views

Is there any regulation on how often a private aircraft should be washed?

Is there any regulation on how often a private aircraft, such as a Cessna, should be washed?
5
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1answer
192 views

How to trigger warnings on an unplugged aural warning unit?

I got an old 80-0557-11 Rev A manufactured by Grimmes from an EMB-120 Brasilia, and I was wondering how to make it speak. I powered the component with a 28VDC power supply. It only said "Aural unit ...
1
vote
1answer
218 views

How does the idle mixture adjustment in a Stromberg NA-R9B float-type carburetor work?

At what temperature should idle mixture adjustments be made in Stormberg NA-R9B float-type carburetor?
3
votes
1answer
343 views

How does the idle speed adjustment in a Stromberg NA-R9B float-type carburetor work?

What is the purpose of the idle speed adjustment in a Stromberg NA-R9B float-type carburetor? In what situation do we adjust the idle speed?
2
votes
2answers
164 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
348 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
votes
1answer
142 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
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1answer
334 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
votes
4answers
493 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
176 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 ...
7
votes
4answers
319 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
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3answers
704 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
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1answer
359 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
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0answers
155 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
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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
450 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
510 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
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1answer
486 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
731 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
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 ...
3
votes
1answer
509 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 ...
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3answers
1k 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 ...
3
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0answers
238 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 ...
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0answers
354 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 ...