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Use this tag for questions pertaining to the maintenance of aircraft, including owner-performed maintenance and required inspections (annual, 100-hour, etc.)

2
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1answer
60 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
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0answers
31 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!
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3answers
146 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
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1answer
46 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 ?
0
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2answers
55 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
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2answers
2k 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
85 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 ...
2
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0answers
100 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
25 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
75 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
74 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)
4
votes
1answer
215 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
68 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
87 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
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1answer
85 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
82 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
59 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
65 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
209 views

Gas Turbine Engine Starting Sequence [closed]

How to explain the figure above?
1
vote
1answer
134 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
votes
0answers
57 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
282 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
133 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
47 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
341 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
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
451 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
182 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
233 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
votes
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
160 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, ...
1
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2answers
209 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" ...
1
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1answer
83 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
57 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.
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0answers
116 views

What is the procedure to change EASA part 66 basic AML from one issuing authority to another?

What is the procedure to change EASA part 66 basic AML from one issuing authority to another? Is it really possible to do?
7
votes
1answer
399 views

Most time-consuming tasks while a plane is on the ground

How long should commercial planes stay on the ground after landing before they can take off again? What is the most time-consuming thing/task/operation that happens during this time? Is downloading ...
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0answers
63 views

Is there a standard install direction of the abradable shroud honeycomb on a CF6-80c2 engine?

Is there a standard install direction of the honeycomb cells on the Fan Forward case on the CF6-80C2 abradable shroud section? I have seen engines that the honeycomb cells run point to point front ...
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votes
1answer
193 views

Is it possible to remove an A320's main gear using one main jack and one nose jack?

I have only one set of jacks (nose-main LH and RH) and I need to swap the main landing gear from one aircraft to another. I don't have a dummy landing gear. Is this possible?
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1answer
129 views

How are the NEO LEAP-1A engines attached on the A320?

How many bolts hold the NEO LEAP-1A engine to the pylon at the forward mount and at the aft mount?
-1
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1answer
100 views

In BGA or ATR's what are the major causes of ODOR in Cabin or Smoke in Cabin? [closed]

In BGA or ATR's what are the major causes of ODOR in Cabin or Smoke in Cabin? There are some of the maintenance activities that are related to removal of Engines or APU. Removal reason: Smoke in cabin ...
2
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1answer
87 views

When did ATA introduce ATA Chapters?

When did ATA introduce the ATA chapters and since when was it used by all manufacturers? Thanks!
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0answers
131 views

How are turbine blades overhauled?

How are turbine blades overhauled? What techniques are commonly used and how does it affect the integrity of the blade?
0
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1answer
114 views

Can I use parachute fabric to cover an aircraft fuselage and wings?

... Are there disadvantages to using parachute fabric to cover an experimental aircraft? So far I observed the following: I believe I put this fabric in an open place for a year I found no cracks ...
30
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1answer
4k views

Why are aircraft coloured in yellow during construction, repair or overhaul?

Why are aircraft usually coated with "yellow", while either during construction or repair and overhaul? What exactly is the purpose of it?
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0answers
93 views

What could cause an engine shutdown on a Q400 with CDS codes 732, 907, 915 and 938?

A Bombardier Q400 displays error code 938 on the Central Diagnostics System(CDS), which is attributed to turbomachinery chip detector. An examination shows debris in the detector hitch which is ...
0
votes
1answer
317 views

How are jet engine RPM cycles used to monitor LCF life?

Can someone please define what are N1 and N2 throttle cycles? These are used to keep track of the accumulated low cycle fatigue (LCF) life of rotating components. But I cannot find an exact definition ...
0
votes
1answer
115 views

What skills do aviators have uniquely that could cross over to another industry? [closed]

I have developed sensitivities to several chemicals used in aerospace. I have to make a shift away from our industry, so I would like to know what are qualities in aviators that would be unique and ...
0
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1answer
184 views

Where to find the aircraft maintenance manual for the Falcon 2000? [closed]

How can I find a Falcon 2000 aircraft maintenance manual (AMM)?
12
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1answer
516 views

How are fuel tanks cleaned out?

One episode of the BBC series "Engineering Giants" featured a BA 747 undergoing a multi-week "D check". Here the inside of a fuel tank was surprisingly clean and dry (to me): ...