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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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182 views

What certifications must one have to repair/alter propellers and instruments?

According to 14 CFR 65 Subpart D A certificated mechanic may perform or supervise the maintenance, preventive maintenance or alteration of an aircraft or appliance, or a part thereof, for which he ...
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1answer
156 views

How and why would one call the cockpit of an A330 inside its nose gear bay?

According to this A330 call panel diagram, there is an option to call the nose gear bay with the MECH button. Where is the connection for this in the nose gear bay, and what would it be used for? The ...
8
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1answer
361 views

What do you need to do to bring a 737 Max back in service after 6 months in storage?

What kind of maintenance has to be performed on an aircraft if it has been stored for 6 months? For example, do fluid need to be changed, have the tires become flat etc.
4
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1answer
110 views

What are torque events and are they very common when flying a rotorcraft?

On rotorcraft like the MD500 the POH suggests that torque events be recorded in the aircraft maintenance logbook. What are these events, are they common and how many are typically logged during the ...
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1answer
68 views

What priviliges and limitations does an Aircraft(General) mechanic have versus an A&P?

The FAA provides practical test standards for Airframe, Powerplant, and General mechanic certificates. Mechanics seem to demonstrate a preference for Airframe & Powerplant, so much that "A&P" ...
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1answer
53 views

What is the most critical data to measure for a predictive maintenance model for a drone?

I'm looking at making a predictive maintenance model for a drone (quadcopter mainly but can include others) I'm wondering what is the most common causes of failure due to "overflying". (not including ...
7
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2answers
392 views

Why would the engine quit when turning on the R magneto after an overhaul?

I just finished overhauling a Lycoming O-360; it's currently on a stand, i.e. it's not in the aircraft. I replaced the capacitors and point gaps on both the L and R mags. I adjusted the E-gap and ...
2
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2answers
284 views

What names are used for certified “mechanics”?

While watching a documentary on the the UK Red Arrow aerobatic team, mechanics were sometimes called "tradesmen", "technician", or "engineer". In the US they are commonly called "aircraft mechanics" ...
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2answers
973 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 ...
40
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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
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1answer
184 views

Do anti-collision lights in aircraft lose intensity over time?

Do anti-collision lights installed in aircraft lose their intensity over time and need to be replaced every few hundred hours of operation?
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1answer
47 views

EASA part 66 licence conversion to the Japanese version?

I am looking at a job proposal in Japan. I need to transfer my EASA Part 66 engineers license to the Japanese version. Can anybody offer any advice on how I would achieve this?
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1answer
36 views

Can one use a calculator for the EASA part 66 exam?

For the first 3 modules you will need to do some calculations, is a calculator allowed?
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2answers
4k views
5
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2answers
188 views

Why would a C150 tachometer be sluggish?

After having an issue with a tachometer bouncing so much that it fell off, I now have the opposite problem with the replacement (Mitchell D1-112-5025): The tachometer is sluggish. When I open the ...
0
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1answer
50 views

What's Permaswage / Harrison tube repair?

In modern aircraft, damage of hydraulic tubes can be repaired by Permaswage/Harrison provided by maintenance manuel. However, What is Permaswage / Harrison? It's a name of company?
14
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3answers
9k 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 ...
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0answers
84 views

What is the procedure for doing a symmetry check on a Cessna 172?

I'm trying to find the steps to do a symmetry check of a Cessna 172. Or a form, or the section of the maintenance manual.
8
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2answers
320 views

How much of a plane is replaced over the lifetime of an aircraft?

A photo of an OC-135 with (presumably) P&W TF33-P-5 engines made me wonder how many of the components had been replaced, and what was left of the original airframe, engines, and other parts. There ...
2
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1answer
102 views

How to literally take the wing off a single engine Beechcraft-style airplane?

First off I do not want to do any kind of maintenance. I was driving past an auto junk yard and saw they have half of a low wing, maybe a Beechcraft, airplane and I would like to try and buy the wing ...
2
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1answer
82 views

How is a composite fuselage repaired when structurally damaged?

In case of FOD, a fuselage puncture for example, what is the repair process? Considering time, complexity and cost, how is compared if it was an aluminium fuselage?
6
votes
2answers
209 views

Can a private pilot placard an inoperative instrument?

For certificated small aircraft that are not required to have a minimum equipment list. If you have an instrument break while on a cross country flight and it is not a legally required instrument for ...
17
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3answers
3k views

What is the difference between a Mechanic and a Repairman?

In reviewing some of the data published by the FAA, I noticed that they make a distinction between a mechanic certificate and a repairman certificate. What is the difference?
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1answer
60 views

Are there any certification requirements for steering bypass or lock pins?

Are there any requirements for aircraft bypass and/or lock pins? Do they have to be somehow certified by local or international aviation authorities?
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0answers
53 views

Source and Impacts of cracks on window pane? [duplicate]

Today, I spotted cracks on the outer window panes, of my aircraft, VT-GWH, a 11 year old A320. The cracks were present on every window pane that I could see. On simple observation, I found that the ...
12
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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 ...
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2answers
165 views

Do you have to lubricate the shock strut?

I have a school report about the lubrication on the shock strut and I was wondering if there is a specific type of lubrication they apply it on. This is for Cessna 150-152
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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?
4
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1answer
254 views

Are Dreamliner windscreens periodically replaced irrespective of damage?

Does Boeing have a statute that commands that the windscreens are changed for new irrespective of no signs of damage or fatigue, and if so, what are the intervals, for safety reasons?
7
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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 ...
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2answers
216 views

Why would a cylinder not work below a certain RPM?

We have an IO 540 Lycoming engine, and cylinder #3 doesn't work below 1900 RPM (cold to the touch; EGT and CHT are zero; no vibration). The engine is new, what could be the cause(s)? We cannot ...
9
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3answers
460 views

For how long after the last A380 delivery does Airbus have to provide spare parts for it?

After Airbus's announcement that they plan to discontinue A380 production in 2021 after the last orders are filled, how long will they have to guarantee the availability of A380 spare parts?
2
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2answers
73 views

what is the earth resistance to be maintained while aircraft is on ground and during ground checks for military aircrafts

While aircrafts are under servicing on ground, the external dedicated earth wires are connected to the aircraft to avoid static hares effect to human beings. How much resistance value has to be ...
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1answer
460 views

Why would one cylinder on a Continental O-200 run cold at idle?

I have a Luscombe with a Continental O-200 engine. The #4 cylinder is running cold at idle, does anyone have an idea why? The other three cylinders are running fine. Some extra information: The ...
12
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1answer
3k views

What is the small cylinder on the firewall to the left of the battery?

What is this and should the yellow wire be soldered to it? Any ideas on preventing the wire from detaching again? I checked the C150 parts manual but didn't see it. Is there somewhere else I should ...
2
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1answer
172 views

What does a white diagonal line mean on an Airbus ECAM DU?

When my A321 powers up, the lower ECAM DU shows only a diagonal white line. What does it mean and what would be the fix?
34
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2answers
9k views

How often should an engine be run, to stay mechanically sound?

It's winter time and many light aircraft are sitting idle. This can be detrimental to an engine's health. What is a good rule of thumb for how often a piston engine should be exercised, and for how ...
21
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9answers
8k views

Why isn't there a “check engine” light in airplanes?

Why don't small airplanes (like Cessna or Cirrus) have "Check Engine" lights, like cars do? For the most part, the people flying these airplanes don't know much more about the plane than they do ...
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 ...
2
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1answer
199 views

What is the procedure to replace carpets in airliners?

Are all the seats removed, as well as trim and baseboard, before the carpet is replaced? If so, how is reinstalling the seats laid out; do they feel for the boltholes? Are the seats bolted on top of ...
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 ...
2
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1answer
169 views

In normal condition, is the Airbus A320 APU fuel supplied by the main engine boost pump only?

I have a question relating to APU fuel system. As said in material, there are 2 system supplying fuel for APU to operate. 1st one is primary and 2nd one is secondary. In the 1st system or low ...
4
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1answer
230 views

Which aircraft/powerplant manufacturers use metric hardware?

The vast majority of airframes and powerplants use U.S. standard/SAE hardware. Which manufacturers of engines and airframes use metric hardware?
10
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1answer
2k views

Do rivets on airframe need special sealant to be airtight on pressurized airliners?

Do rivets on airframe need a dedicated sealant, e.g. epoxy, to be really airtight on a pressurized airliner, or is the expansion of the rivet shaft already sufficient? As a side note, how are carbon ...
7
votes
1answer
229 views

What can I be allowed to do as a engineering/ maintenance intern at a european airline?

I am just about to (hopefully) embark on a short internship at the maintenance department of a medium-sized european airline (i.e. under EASA framework). While the internship has been pushed towards ...
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1answer
141 views

What is the acceptable position of the brake wear indication for A320?

What is the acceptable position of the brake wear indication (PIN) for an A320 to be safely dispatchable?
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1answer
109 views

May an airline replace an airliner's engines without the aircraft manufacturer's involvement?

Around a year ago in our country, there was an advertisement on TV regarding an airliner's program to modernize their airplanes' power plants. This airline has various types of Airbus and Boeing ...
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1answer
144 views

What happened to the power plants after an aircraft is retired?

Few weeks ago, there was a Boeing 747 belong to an airliner retired in our country. I am not sure what series is that, but seems it is 747-200. What then will happen immediately to the power plants ...
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2answers
435 views

How and how often are the oxygen masks in the cabin checked?

Looking at this old answer I can see that oxygen masks check is mandatory for the flight deck. What about passenger masks? Is this check done daily on airliners? How is this check conducted and what ...
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0answers
62 views

Are there required standards for gate power cable maintenance?

I am looking for reference(s) addressing gate power cable maintenance, for both 28V DC and 400Hz. Do the FAA or any manufacturers have standards for measuring the connector pins to determine wear?