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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77 views

Is this true about any generator which uses for grounds aircraft checking by 220W cables ? Shouldn't use from GPU? [closed]

Is this true about any generator which uses for grounds aircraft checking by 220W cables ? Shouldn't use from GPU ? I wanna know about is nessecary 220W AC power for connect to Aircraft when those ...
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0answers
42 views

What are the differences between a compressor wash on wing vs on test bed

I work in an aircraft engine overhaul facility and I’m trying to understand the process of compressor washing engines on Wing compared to washing them in a test bed. What process steps are different ...
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2answers
87 views

Difference between general visual inspection and pre-flight check inspection

I know the definition of general visual inspection (GVI) but I cannot understand the differences (if there are) with a pre-flight check inspection. I am new in the field and I am not a pilot (don't ...
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2answers
110 views

What is the reason for this engine oil service procedure on a Bombardier CRJ?

Someone told me that servicing the engine oil on a Bombardier CRJ900 aircraft with the APU on could lead to the particular engine being overserviced. He then advised that the engine-oil service be ...
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2answers
2k views

What does Lion Air faking the repair of the AoA vane mean for the Florida repair shop that ceased operations?

This is a lengthy read, but worth it. I'll quote the main piece I am speaking of. At the Bali airport, a vane, known as an angle of attack sensor, was replaced. Crash investigators were presented ...
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3answers
316 views

How does the engine wash improve engine performance?

According to maintenance manual, we usually carry out engine wash (CFM56) with pure water as scheduled task. Pure water is injected into the engine from the LP compressor inlet while the engine is ...
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1answer
84 views

Are you mandated to use a Fault isolation manual when clearing a defect on an aircraft?

I operate a Bombardier Dash 8 Q400. I want to know if aircraft engineers are mandated to close or rectify a defect by only following the fault isolation manual (FIM). Can an engineer instead use his ...
5
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1answer
155 views

Why are some aircraft's life limited by both cycles and flight hours?

For instance the Pilatus PC-12 life is either 27,000 cycles or 30,000 flight hours, whichever comes first. I understand that the limit life in cycles is mainly due to fatigue in terms of ...
10
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1answer
696 views

What are the costs versus benefits of takeoff/landing on grass versus pavement in a light aircraft?

This question stated that landing on pavement is hard on tires compared to grass, however I don't necessarily agree with that. Even if it is true the impact on the gear and other components may ...
2
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1answer
141 views

How often are turbine blades in jet engines replaced?

How often are the turbines in the hot section of the jet engines replaced due to deteriorated TBC? or just how often are they replaced? lets say for CFM56-7
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80 views

What does pre/post modification mean in Airbus MPD?

What is the difference between POST MOD (with partial mod i.e SXXXX) and PRE MOD (with partial mod) in the applicability column of an Airbus MPD (Maintenance Planning Document)?
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96 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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1answer
141 views

Do aircraft need special modifications for polar routes?

Does an aircraft need special modification for polar routes?
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1answer
200 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 ...
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90 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
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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1answer
129 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
97 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 ...
37
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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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65 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
178 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
81 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
176 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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2answers
138 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 ...
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1answer
56 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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1answer
60 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 ...
2
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1answer
69 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 ...
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1answer
169 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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2answers
162 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
276 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
107 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 ...
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0answers
122 views

What is the service cycle or interval of the Landing gear of an A380 and 747-8

What is the service cycle or interval of the Landing gear of an A380 and 747-8, i.e how long between service, eg after how many take offs and landings with particular reference to bearing checks and ...
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2answers
252 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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2answers
1k 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 ...
5
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1answer
443 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, ...
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1answer
87 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 ...
5
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1answer
243 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 ...
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1answer
82 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
166 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 ...
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2answers
197 views

Why buy an new plane or an helicopter? [closed]

This really keeps coming to my head. A brand new 172SP costs a quarter million while a older one (10 years older or a little bit older) costs for less than 100.000 Dollars and the only visible ...
2
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1answer
180 views

How are AOA sensors tested after working on them?

If a maintenance or replacement has been done for an AOA sensor, would the mechanic be able to test if the sensor now works correctly? Can such a sensor be tested on the ground? If there is no ...
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1answer
212 views

How and why would one call the cockpit of an A330 inside its nose gear bay?

According to this A330 call panel diagram, there is an option to call the nose gear bay with the MECH button. Where is the connection for this in the nose gear bay, and what would it be used for? The ...
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2answers
718 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
118 views

What priviliges and limitations does an Aircraft(General) mechanic have versus an A&P?

The FAA provides practical test standards for Airframe, Powerplant, and General mechanic certificates. Mechanics seem to demonstrate a preference for Airframe & Powerplant, so much that "A&P" ...
4
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1answer
145 views

What are torque events and are they very common when flying a rotorcraft?

On rotorcraft like the MD500 the POH suggests that torque events be recorded in the aircraft maintenance logbook. What are these events, are they common and how many are typically logged during the ...
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1answer
251 views

Can one use a calculator for the EASA part 66 exam?

For the first 3 modules you will need to do some calculations, is a calculator allowed?
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1answer
194 views

What's Permaswage / Harrison tube repair?

In modern aircraft, damage of hydraulic tubes can be repaired by Permaswage/Harrison provided by maintenance manuel. However, What is Permaswage / Harrison? It's a name of company?
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161 views

What is the procedure for doing a symmetry check on a Cessna 172?

I'm trying to find the steps to do a symmetry check of a Cessna 172. Or a form, or the section of the maintenance manual.