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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.)

4
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1answer
176 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?
0
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0answers
13 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 licence to the Japanese version. Can anybody offer any advise on how i would achieve this?
0
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2answers
198 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 ...
2
votes
2answers
65 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 ...
12
votes
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 ...
4
votes
0answers
75 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 ...
2
votes
1answer
140 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?
9
votes
3answers
407 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
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
191 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 ...
2
votes
1answer
112 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
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 ...
0
votes
1answer
87 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
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 ...
3
votes
0answers
122 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 ...
0
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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?
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 ...
-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?
0
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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
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 ...
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, ...
0
votes
0answers
38 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
172 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
95 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 ?
2
votes
2answers
118 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
vote
1answer
118 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
votes
1answer
225 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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vote
0answers
34 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)
6
votes
2answers
406 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 ...
3
votes
0answers
97 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
177 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
164 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
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 ...
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
vote
1answer
100 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 ...
1
vote
1answer
310 views

Gas Turbine Engine Starting Sequence [closed]

How to explain the figure above?
2
votes
2answers
461 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
85 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
297 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
vote
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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vote
0answers
67 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
votes
1answer
449 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 ...
30
votes
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
vote
2answers
762 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 ...
-1
votes
1answer
380 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 ...