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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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0answers
21 views

What are the most maintenance-intensive parts of a helicopter?

Which components of a helicopter are the "driving" ones that require most regular attention and down-time, and how often do they last between inspection or overhaul? I don't have a specific model in ...
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0answers
22 views

What is the future of line maintenance service providers in EU? [on hold]

To elaborate on the question further. What do you think are the strengths, weaknesses, opportunities, and threats to Line Maintenance service providers based in the EU such as BA Engineering, ...
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1answer
143 views

What is the relation of AIR BLEED IN message with the pack system on an Airbus A320?

Before the power-up, if the pack switches are set to the ON position and the aircraft is powered up with the APU bleed off, is there a chance that the AIR BLEED IN maintenance message comes up on ...
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1answer
81 views

Do aircraft need special modifications for polar routes?

Does an aircraft need special modification for polar routes?
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0answers
81 views

Why does A320 Main Wheel need to be tightened 3 times during installation?

I have another question related to maintenance practices. During replacing MLG wheel of A320, it is said that we need to tighten the wheel nut 3 times with different torque values. The first one has ...
34
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4answers
11k views

Why do military jets sometimes have elevators in a depressed position when parked?

Why do they have elevators in such a position as if the joystick is pushed forward, even though there's nobody inside the cockpit?
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0answers
65 views

If one cabin PA loudspeaker fails, do the rest get louder? [closed]

In an cabin intercommunication data system, if one loudspeaker fails do the rest get louder? Or does the volume stay the same without the failed speaker?
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0answers
85 views

What replacement wings are available for old F-16's?

Eventually, material fatigue will force any aircraft to either be grounded or have its wings rebuilt, or replaced. And please, correct me if I'm wrong. For the F-16, if one were to replace its wings, ...
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4answers
16k views

How much does it cost to give an airliner a fresh coat of paint?

Just a random thought I had: the weather gives a jet's paint job a battering; meaning they need to be resprayed approximately once every 5-10 years. (See How often is a passenger jet aircraft painted?)...
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1answer
113 views

What is the correct technique for working on an airframe with a pneumatic rivet gun?

I currently work as a trainee AME and want to eventually start specialising in sheet metal / composite repairs as I've heard the money is really good for these specialist skills. I've bought myself a ...
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1answer
80 views

Exceeding VLO and by how much is too much?

Piper Seminole (PA-44-180) VLO (max gear retraction speed) is 109 KIAS. I've heard that manufacturer published limitations are significantly lower than actual structural and system limitations. What ...
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3answers
9k views

Are task cards still used in aircraft maintenance?

I used to work for a company making maintenance software for the shipping industry. Each component, from a cylinder in an engine to the furnace has to be inspected after (e.g.) 10,000 running hours, ...
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4answers
9k views

How are aircraft depainted?

There are several questions about livery changes and livery in general on this website. Yet, I fail to find information about paint removal. As a routine maintenance for an airframe that can live for ...
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2answers
4k views

Do multi-engine jets need all engines with equal age to reduce asymmetry in thrust and fuel consumption arising out of deterioration?

Let's assume, one of the engines on a twin-jet needs replacement and the jet is is fitted with an old engine and a newer engine after the due replacement, the older engine would tend to produce less ...
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0answers
58 views

How long do I have after graduate to take the FAA A&P exams?

2 years ago I went to a college for FAA A&P and graduate but I didnt go and take the written, oral and practical exam. My question is there a time limit after I graduate to take those exams? And ...
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1answer
161 views

Altimeter shows 100 foot drop when power is added. Is this a leak in the static system or broken altimeter and how long will the fix take?

My instructor and I were preparing for my Private Pilot Check ride today when we noticed that the analog altimeter would suddenly lose 100 feet when we added power. The only way I can think to ...
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2answers
335 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
46 views

What is the difference between component service and inspection?

What is the difference between component inspection and component service? And is overhaul / restoration a service or an inspection?
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2answers
78 views

Can a closed Airworthines directive get reopened by a new revision?

There is an Airworthiness Directive that has been closed by accomplishing its terminating action. But there's a new revision that changes the terminating action. Do I have to comply with the new ...
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1answer
1k views

How much maintenance time did it take to make an F4U Corsair ready for another flight?

A coworker I worked alongside once told me that during his time in the Navy, he was responsible for taking care of maintenance on F-22s. He stated that every F-22 required 10 hours of maintenance for ...
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1answer
70 views

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

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 ...
2
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2answers
411 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" ...
12
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5answers
3k views

Can an aircraft owner legally replace an oil quick drain valve?

The quick drain valve on our older Mooney has started leaking and making a bit of a mess. We went to our local shop to asked them to schedule to replace it for us and they told us they are booked out ...
3
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1answer
163 views

What is the difference between aluminum tape and speed tape?

What is the difference between aluminum tape and Speed tape? Are these same or not?
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1answer
55 views

Does TSR (Time Since Repair) Need A Reset After A Clean/Inspect/Test Workscope?

So I am a little unclear on what the regulations recommend. Say you have a component that has a Restoration (Ignore the nomenclature) workscope but it is strictly an Inspection/Cleaning/Testing ...
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1answer
162 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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3answers
493 views

Are there any known maintenance issues with older Mooney wooden wings?

Are there any maintenance issues or ADs for the older Mooneys with wooden wings? I'm looking at a 1958 M20A (always hangared) and I'd like to know if there are specific points to check.
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2answers
133 views

How do piston engines deal with sea spray (saltwater ingestion)?

From my related question, I want to know about sea spray being ingested into a piston engine during flight. Will this immediately corrode the engine unless there are special materials? I'm asking ...
2
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1answer
68 views

Where can I find details about a Cambridge Scientific Instruments Fuel/Air ratio Indicator?

In our restored Harvard Texan T-6 WW2 trainer aircraft, a Fuel/Air Ratio Indicator was installed. We cannot locate the wiring diagram of this system or information for the Cambridge Scientific ...
6
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1answer
546 views

How much time does it take to calculate the leveling and weighing of big and small aircraft?

What methods are used to achieve that? According to my search : For old planes they use a plumb bob and measuring tools. On new and big planes, the process is computerized. Built-In Electronic ...
13
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2answers
5k views

Why/How does a “Powerflow” exhaust increase horsepower?

I've seen airplanes (typically Cessna 172s) with a "Powerflow" exhaust system and then claim to get several more horsepower, resulting in faster cruise speeds. How does a Powerflow exhaust work, and ...
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2answers
488 views

Is it possible for a Citation Jet not to have an APU or AIR COND?

In reviewing a number of CESCOM10 reports it has become apparent that some of the aircraft don't report APU hours (instead they report AIR COND). Is it possible that a Citation Jet doesn't have an ...
12
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5answers
9k 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 ...
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1answer
387 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
189 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
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2answers
231 views

What needs to be considered when changing a tire during boarding/deboarding?

Passenger aircraft tires are physically inspected by the cockpit crew member or technician after each landing or before take-off, that the tire may have been cut or punctured as it may have hit ...
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2answers
157 views

For large commercial aircraft, how are the tires changed?

Something at least the size of a 737, all the way up to the A380. How are aircraft tires changed for large commercial aircraft? Are they actually jacked up like with a car?
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2answers
101 views

What Oil thickness is used for the geared turbofan jet engine gearbox

In light of the huge operating speed of the geared tubofan gearbox gearing down the fan speed, what Oil thickness is used for the geared turbofan jet engine gearbox and does it use use regular gearbox ...
5
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1answer
403 views

Are there any safety hazards when testing the F-16's fire control radar on the ground?

What are the procedures for ground testing an aircraft's fire control radar - for the F-16 or any other aircraft - and are there safety hazards associated with exposures to humans? Most importantly, ...
3
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1answer
526 views

What are good study guides/practice tests for the airframe maintenance certificate? [closed]

I am approaching my 18 month mark on the job. Wanting to get my A license first. I have done all kinds of airframe work in this time period. Wondering if anyone has suggestions for the names of the ...
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1answer
89 views

What is the difference between iSpec2200 and S1000D specifications?

I know the iSpec2200 and S1000D are the specifications which are used in the aircraft maintenance manual, I have to know how they actually work in the aviation domain and what is the difference ...
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0answers
90 views

What is the service cycle or interval of the Landing gear of an A380 and 747-800

What is the service cycle or interval of the Landing gear of an A380 and 747-800, i.e how long between service, eg after how many take offs and landings with particular reference to bearing checks and ...
11
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1answer
363 views

Do FDRs & CVRs (black boxes) have an in-service life span?

Do Flight Data Recorders (FDRs) and Cockpit Voice Recorders (CVRs), aka black boxes, have an in-service life span? Is it necessary to replace them over time? If so, are there any regulations ...
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2answers
362 views

What is the difference between MEL and CDL?

I know the MEL and CDL are the minimum equipment list is provided by the manufacturer, if component missing or damaged means the aircraft must pass the MEL and CDL, I need some suggestions how it was ...
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1answer
163 views

Where are the fuel tank sumps on an Aquila A210?

When I drain the fuel I have to do it three times: In addition to the drainer openings on both undersides of the wing and under the front fuselage (3 times in total). Can you tell or show me where ...
0
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1answer
80 views

Materials for temporary dent repair?

On a recent commercial flight (A320neo), I noticed some materials attached to the leading edge of a slat (no photo available). The attached material was not smooth, it rather looked like a small ball ...
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1answer
237 views

Is it normal for a Boeing 757 engine to bounce under its fairing?

Earlier this week I was on a 757 flight from SFO to JFK and the right engine was bouncing under the fairing under mild turbulence, and really moving 2+ cm under moderate turbulence. Is that in any way ...
11
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2answers
689 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 fluids need to be changed, have the tires become flat, etc.
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1answer
72 views

Difference between general, airframe and power plant concentration courses

Trying to enrol for an aircraft maintenance technician course but the options are three that’s general, airframe and powerplant concentration. With the general being an affordable course to pursue, ...
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1answer
237 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?