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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.)

1
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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
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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?
23
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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
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 ...
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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 ...
2
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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 ...
9
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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 ...
0
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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
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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
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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 ...
2
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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 ...
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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?
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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 ...
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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?
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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
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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 ...
25
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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, ...
0
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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!
0
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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
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 ?
1
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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 ...
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
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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 ...
4
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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?
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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/...
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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?
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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)
6
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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 ...
2
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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
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

Who can sign off the aircraft after completion of 100-Hour Inspection?

Can the mechanic who performed 100-hour inspection sign off the aircraft?
3
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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 ...
0
votes
1answer
62 views

Specific Acrylics for fabricating windscreen [closed]

I've a experimental aircraft in need of a windshield due to crazing caused by fuel and cracking caused by stress. It is made of polycarbonate/Lexan and I want to replace it with acrylic because of its ...
1
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1answer
97 views

What does the message content in the ARINC 615A FIND protocol look like?

I know the FIND protocol is used to discover which LRUs are available if the data loader supports the FIND protocol. I also know the message is sent as a broadcast using UDP, but what is in the ...
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1answer
305 views

Gas Turbine Engine Starting Sequence [closed]

How to explain the figure above?
2
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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 ...
0
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0answers
84 views

What is the difference between an Instrument and Equipment?

In an aircraft, what things is an instrument and what things is an equipment? For example the ILS, is the Antennas located in the runway considered to be an instrument or an equipment? Or is there ...
2
votes
3answers
296 views

Are all tires on an aircraft replaced at the same time?

On cars, it is often to replace all four tires at the same time. Is this true also for aircraft? I imagine the nose gear and main gear probably can be replaced at different intervals. However, are ...
1
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2answers
146 views

What causes the inside glass of flight instruments to get hazy?

Sometimes on analog flight instruments (aka steam gauges) there is a haze or fogginess on the INSIDE of the glass that is NOT condensation. You can often find it on older aircraft with older ...
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0answers
65 views

Why doesn't GA aircraft use the JASC/ATA document standard?

By international law large aircraft are required to categorize aircraft information using a standard called the ATA document numbering system (Air Transport Association). The ATA document chapters ...
0
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1answer
447 views

What is the cause of cracking and corrosion in Trent 1000 engines?

According to this description and this one of some Trent 1000 engine problems, there appears to be a problem with cracking/corrosion of the fan blades, but does anyone have any insight as to why this ...
29
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1answer
4k views

Can the emergency slide be re-used after it has been deployed?

Can the emergency slides be re-used and re-packed after they have been deployed, assuming no damage is done? For example, I heard of a case where the slide was accidentally deployed due to opening of ...
1
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2answers
751 views

Is a 100 hour inspection required for an aircraft to be used in a checkride?

Is a 100 hour inspection required when renting an aircraft for a practical test with a DPE, to whom you are paying a fee? Lots of money is being exchanged, yet the DPE told me that it is not "For ...
3
votes
3answers
193 views

How are leaks in door rubber seals detected?

There are few reported incident where the rubber seal on the door was damaged and it took numerous hours to find the cause and then find the location of the damage. I want to know the ways to detect ...
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1answer
343 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 ...
13
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2answers
3k views

How frequently are airplane windows cleaned?

When you’re driving on the highway, after sometime unwanted insects and dirt accumulate on your windshield. When you stop over at a gas station, you might clean it off. It’s likely the case for ...
4
votes
1answer
296 views

What aircraft maintenance logs should I have available for a private checkride?

I’m about to do my Private Pilot Checkride in my own plane. I’ve been trying to find a list of things that will be needed for the Checkride in the logbook, as I had thought it was an updated annual, ...
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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" ...
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1answer
157 views

How to measure the aircraft maintenance cost of a operator? [closed]

How to measure the aircraft maintenance cost of a operator? What tool or mechanism can be used to measure such performance? Or what index can be used to determine the performance?
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2answers
73 views

What requirements do A&Ps (AMT) have to work on avionics?

Is there any additional requirement for A&Ps to work on avionics or is that even a totally different license? I just wonder why only a few A&Ps I met, also do avionics.