Stack Exchange Network

Stack Exchange network consists of 174 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.

Visit Stack Exchange

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.)

1
vote
1answer
111 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?
4
votes
1answer
141 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?
34
votes
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
votes
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 ...
23
votes
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
votes
1answer
190 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
votes
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
votes
1answer
105 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 ...
0
votes
0answers
87 views

Are landing gear modules interchangeable? [closed]

Are aircraft landing gear modules modular in a way where I would be able to replace the Left Main Landing on one aircraft with the Right Main Landing gear from another aircraft? Or are landing gear ...
22
votes
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
votes
1answer
224 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?
9
votes
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
225 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 ...
0
votes
1answer
79 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?
0
votes
1answer
106 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 ...
2
votes
1answer
138 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 ...
1
vote
2answers
115 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 ...
6
votes
2answers
380 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 ...
1
vote
2answers
231 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" ...
0
votes
0answers
54 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?
2
votes
0answers
121 views

Do aircraft manufacturers take steps to prevent pests like geckos from damaging the electronics?

Many Australians are suffering huge bills due to geckos getting into the circuit boards of their air conditioning units. Of course this is highly profitable for A/C manufacturers as they supply ...
1
vote
2answers
127 views

How many hours to remove and install a Cherokee 180 engine and prop

How many hours should it take a shop to remove, install, and adjust the engine in a Cherokee 180 with a fixed pitch prop? This would include the baffles and any hardware needed to be removed and ...
2
votes
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?
-1
votes
2answers
109 views

Why does the military not use Engine Condition Trend Monitoring? [closed]

What are the advantages of ECTM and why is it not used in military aviation even though it will help in many ways?
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 ...
1
vote
1answer
1k views

What is the FAA's definition of “for hire”?

(note: references to specific FAA documents or cases are always appreciated!) This is a general question and might best be considered as open-ended. It is, however, posed for clarification of a few ...
0
votes
0answers
72 views

What is the official EASA definition of A, B, C and D checks, or where do I find it?

Schedule Maintenance is divided into many different checks. What is the official definition (EASA website, not wikipedia) of A, B, C and D check, or where do I find it?
2
votes
2answers
427 views

Why bother tracking TSN after an overhaul?

I've noticed that mechanics often like to keep track of "time-since-new" (TSN) on components that have already been overhauled. What would TSN matter when the component is tracked by TSO for ...
9
votes
3answers
1k views

What is this molten metal coming from the engine of an Avro RJ 100? [closed]

Yesterday I flew in an Swiss Avro RJ100. As soon as we landed I was shocked to see some sort of molten metal which was incandescent and glowing red dripping down from the vent as indicated in the ...
25
votes
4answers
5k views

Where do extra planes come from?

Last night, I had to change planes at LAX because the United Airlines B737 that I was flying on had radio problems and thus could not fly over the ocean. One of the hi-frequency radios had problems, ...
2
votes
1answer
73 views

What are the potential threats of having the landing gear dirt from mud in a rectractable landing gear airplane?

Recently I have been flying an aircraft with the landing gear very dirt with mud due to the parking area of the airfield on grass and the meteo conditions in recent days. I wonder what are the threats ...
0
votes
3answers
170 views

If the map (reading) light bulb is burned out in my own Cessna 210, what are my options if I want to fly FAR Part 91 under night-time VFR?

If the map (reading) light bulb is burned out in my own Cessna 210, what are my options if I want to fly FAR Part 91 under night-time VFR staying in the traffic pattern doing touch and goes? Can I ...
0
votes
0answers
37 views

If my company has a Line Maintenance Approval, can they perform a Landing Gear replacement in the Flight Line?

I am not sure if a landing gear replacement is performed in the line or base. Also is a line maintenance approval enough? What are the reasons for your answer? Thank you!
11
votes
5answers
7k 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 ...
6
votes
4answers
2k views

What is the “on condition” concept of aircraft maintenance?

"On-condition" appears to mean that a component should be "fit until failure" or that the maintenance should only be performed upon failure of the component. This seems problematic. Can someone help ...
0
votes
1answer
84 views

what's the difference between priority and sequence valve in aircraft?

What roles do they play during retraction and extension of a landing gear ?
16
votes
2answers
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?
1
vote
1answer
117 views

Can an increased current rating of a Ground Power Unit damage an aircraft? [closed]

Assuming you are working on an Aircraft, where the Ground Power Unit (GPU) is rated at 28V DC with max. 1000 amperes. What is the danger involved if your are to increase the current rating of the GPU ...
1
vote
0answers
33 views

Is Function Item Number the same as part number but for components?

I found in the Airbus AMM in the Component Location section the acronym FIN (Function Item Number) and I wonder if it's Airbus way to refer to a part number that is not an expendable part (They use P/...
1
vote
2answers
84 views

Is an A&P certificate ever required to work on military aircraft?

Are military aviation mechanics - including civilian contractors - ever required to obtain an A&P certificate to work on active military aircraft?
-1
votes
1answer
82 views

When the aircraft tires are “worn to limits”, should it be recorded as a pireps or mareps? [closed]

How should be correct recorded when the aircraft tires are "worn to limits" - as a pireps or mareps (the data is reflected in the reliability report)
2
votes
0answers
93 views

What causes this error on the Collins 60A ADF system?

We've got a BAE Jetstream 32 equipped with a dual Collins 60A ADF system, and the co-pilot's side control head is: displaying "FLAG 10" when we press the TEST button; We looked up the error code, ...
1
vote
4answers
9k views

How do I determine the center of gravity on aircraft?

What are the parameters considered and what formulas are used to find the Center of Gravity on an aircraft?
1
vote
1answer
2k views

What is the difference between GVI and DVI?

In any maintenance program I found some terms like General Visual Inspection (GVI) or Detail Visual Inspection (DVI) or Detailed Inspection (DTI). I want to know the difference between these types of ...
1
vote
1answer
175 views

Hydro-pneumatic fuel controls and hydro-mechanical fuel controls

What are the advantages and disadvantages of the hydro-pneumatic controls against the hydro-mechanical controls?
0
votes
1answer
157 views
21
votes
3answers
20k 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?
3
votes
1answer
85 views

Is there such a concept as 'Max Overhauls' for aircraft components?

I have never seen any overhaul-able item with a documented limit on the number of times it can be overhauled. In all cases it was subject to analysis and predicated on it passing certain tests. Has ...
3
votes
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 ...
1
vote
1answer
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 ...