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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.)

0
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1answer
317 views

What are various specifications of Engine oil used in Piston and Turbine engine aircraft?

I only know of two types MIL-O-7808 and -23699. Is there anything else ?
4
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1answer
221 views

What is the meaning of the term “fly back only” in AMM documents?

I am reading an AMM document and I don't get the ideas below: Examine cracks in area A1 and A3: (a) Accept with an inspection each 100 hours, cracks on the inner or outer shroud if there is: ...
26
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3answers
6k views

Why do aircraft piston engines consume so much oil?

This question is related to single/twin piston engine aircraft. After flying in a Cessna 152 and a Piper Dakota I have noticed that they both consume a lot of oil. Oil check is an integral part of the ...
7
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2answers
700 views

Can windshield washer fluid be used to deice small airplanes?

This question is related to small single/twin engine general aviation airplanes with aluminium construction. I understand that it is generally not recommended to use windshield washer liquid to deice ...
0
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1answer
87 views

Where is the modification of an aircraft from floats to wheels and vice versa logged?

How does a maintenance professional, or pilot if allowed, log the change when the airplane is switched back and forth between land and sea? Do they cite the change in the maintenance logbook as ...
2
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1answer
180 views

Does form 337 need to be sent to the FAA prior or after the work has been performed?

Is the Form 337 sent to the FAA prior to the work being performed? Meaning the mechanic awaits the FAAs reply and approval before actually beginning work on the aircraft? Or is the work performed, ...
4
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1answer
365 views

How does a mechanic determine if a repair or alteration requires a Supplemental Type Certificate?

How does a mechanic know when they have exceeded what 14 CFR Part 43 allows for a repair or alteration to an aircraft? They have thus entered an area where the repair/alteration is so significant that ...
4
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0answers
155 views

Why is colour of aircraft access panel outlines darker than the rest of the aircraft? [closed]

I've seen that in nearly every photo of a dark-coloured aircraft (especially prominent in military jets) its panels have a darker colour compared to the rest of the aircraft. What is the reason for ...
6
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4answers
3k views

What is the “on condition” concept of aircraft maintenance?

"On-condition" appears to mean that a component should be "fit until failure" or that the maintenance should only be performed upon failure of the component. This seems problematic. Can someone help ...
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2answers
331 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 ...
4
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0answers
459 views

How to write a good aircraft maintenance work card?

Is there any guidance for writing the aircraft maintenance work cards? I want to find out some articles or books talking about this topic as I just start new job on it. How to write a good aircraft ...
0
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1answer
394 views

What is the difference between static and dynamic seals?

What is the difference between static and dynamic seals and How much leakage is allowed past each seal?
2
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1answer
386 views

What did a maintenance person put into the engines after landing?

I was recently flying on a A320-251N and directly after landing & coming to a halt at the gate, a maintenance person approached the engines carrying a box of something that looked like paint cans, ...
4
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1answer
521 views

How far can A&P mechanics operate aircraft under US regulations?

Anytime an A&P mechanic wants to test the updates/fixes made to an aircraft's systems or any part for that matter, what are the laws (at least under the FAA) that legally allow them to operate an ...
6
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1answer
177 views

What are the requirements for grass height around runways and taxiways?

I am looking for the requirements for grass heights around runway and taxiway edges, signs and lights?
3
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5answers
1k views

What happens if a plane breaks down away from a maintenance facility?

I am curious about what happens when a large plane, such as a commercial passenger jet, has an equipment problem at an airport where the company does not have a maintenance facility. For instance, do ...
2
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1answer
2k views

What type of hydraulic oil is used in the aviation industry?

Among the three different types of hydraulic fluid types (mineral based/petroleum based, synthetic esters, naturally occurring vegetable oils) which one is used in the aviation industry and why?
2
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2answers
4k views

What are service letters and service bulletins?

How do a service letter and service bulletin differ.
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1answer
1k views

What is the FAA's definition of “for hire”?

(note: references to specific FAA documents or cases are always appreciated!) This is a general question and might best be considered as open-ended. It is, however, posed for clarification of a few ...
14
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1answer
384 views

Can an A&P who is also a private pilot receive compensation for conducting maintenance test flights?

Related to this question. Suppose a repair is made to an airplane and a maintenance test flight is required. Suppose the A&P who works on the aircraft is also a private pilot. That person ...
3
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0answers
59 views

Statistically, what are the failure points on sUAS (drone) aircraft?

It is generally recognized that operator error and unairworthy aircraft are the principle factor in sUAS (drone) system failures and accidents. But looking just at the hardware, are there published ...
8
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1answer
1k views

Is it allowed to operate an aircraft when the Emergency Locator Transmitter has been removed?

I purchased an aircraft from which the previous owner removed the ELT before I took possession; it was present during the test flight. I need to know what the minimum legal requirements are for a ...
0
votes
1answer
177 views

How can I troubleshoot an intercom interference issue in a Piper PA-28?

Our Piper PA28-181 doesn't want to let us communicate via its own intercom panel in the dashboard. We connect via the pilot port and an "Intercom SL300". When connected there is a annoying sound on ...
2
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3answers
4k views

How many antennae are there on a typical small aircraft, and how are they connected to the avionics?

As far as i know there are a bunch of antennas on board of a small (EASA CS-23) plane: GPS is for GPS navigation in MHz VHFVOR is for NAV and Glideslope/Localizer ADF is for ADF DME is for DME ...
3
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1answer
202 views

HSI KG 525 PNI non slaved or only slaved?

I'm in Germany and currently on a project about the avionics of an older airplane (PA28). Here is a link to a former reddit question. My Prof. and me want to update the Avionics now - he asked me to ...
0
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1answer
52 views

Aclad sheet metal P/N 22024T3 [closed]

I am looking for aclad sheet metal P/N 22024T3 2MM, 1.2MM AND 1.6MM 1 SQM each. Anyone could help me locate those? I sent requestes to MROs etc, most do not recognize the P/N which is taken from ...
2
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0answers
932 views

What are the differences between an EASA part-66 license and FAA A&P Aircraft Mechanic License?

what is the difference between EASA part-66 license and FAA A&P Aircraft Mechanic License? Are there any reasons for a company or individual to opt for the one or the other or both?
6
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3answers
633 views

Explain how the infrared flame detector work? [closed]

For fire detection systems, such as for engine fire detection, how does the infrared flame detector work?
2
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1answer
276 views

What does runaway failure mean (position difference between APPU and FPPU) on A320?

I've been reading the description and operation of Flap systems. WTBs will stop and hold the transmission whenever SFCCs receive some failures.
2
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1answer
240 views

Why are thermal switches connected in parallel to each others?

Why are thermal switches fire detection system connected in parallel to each others?
4
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1answer
420 views

What is the best extinguishing agent when wheels catch on fire? [duplicate]

What extinguishing agent must be used in the event of a fire involving wheels/tires? Why?
0
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2answers
150 views

Is it possible for me to work at NASA or other research companies as aircraft mechanic? [closed]

I know NASA is huge but is it possible for me to work there or other companies similar to it? If possible, how? I currently work at an MRO as aircraft mechanic. My work is mainly on flight controls. ...
2
votes
1answer
566 views

What are the following documents about aircraft maintenance?

What is a service bulletin? How does it originate? What is a rapid revision in aircraft maintenance? What is a non-conformation report? What is the difference between these 3 documents?
4
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2answers
182 views

How are aircraft lifespans tracked?

When returning from each flight, during which it is subjected to adverse conditions, say arctic weather, desert heat or just moderate conditions, how is an aircraft evaluated to accurately keep track ...
8
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2answers
479 views

Will manually removing nicks from compressor blades significantly affect the operation of the compressor?

I've recently found a channel on Youtube where a jet engine technician goes into great detail about the work he does on maintaining and repairing jet engines In this particular video (and also an ...
2
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1answer
180 views

Is it okay to use magnetized tools on airplanes?

Let's say you stored your tools on a magnetic organizer in your toolbox, such as the one pictured. Now you go and use a socket or wrench that is slightly magnetized. Have you done wrong?
1
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1answer
168 views

Is there AOG liability?

From Wikipedia: Aircraft on Ground or AOG is a term in aviation maintenance indicating that a problem is serious enough to prevent an aircraft from flying. Generally there is a rush to acquire ...
4
votes
1answer
797 views

Is it possible to re-engine aircraft with different engine options?

Most airliners have multiple engine options and so I was wondering if it would be possible for operators to fit a different engine type to their existing aircraft; let's take for instance the Boeing ...
6
votes
1answer
199 views

At what age does a regularly maintained airframe most commonly start needing frequent repairs?

I am looking to buy a Cessna 182. I am trying to work out the sweet spot between age and price. I am looking for a plane that will be really reliable. I am looking to spend several months flying ...
7
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3answers
1k views

How is a turbine engine rotated for starting and inspections?

I'm doing an assignment for my Level 3 Aeronautical Engineering course and stumbled on this question and I can't seem to answer it (we have had no teacher for 4 months and therefore we have to learn ...
3
votes
1answer
1k views

American Airlines Astrojet - is it really 'polished aluminium'? [duplicate]

I came upon this article, referring to American Airlines' roll-out of a 737-800 in their Astrojet livery. In the article it describes this as 'polished aluminium'. (Photo supplied by American ...
7
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1answer
186 views

Is AD compliance ever physically verified when maintaining an aircraft?

As we all know around here, national aviation authorities put out Airworthiness Directives mandating certain changes be made to aircraft during their service life so that the aircraft can stay ...
7
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2answers
433 views

Can a pilot or owner repair a seatbelt?

I have a Cessna 210 with inertia reel seatbelts. The spring coil on the retention wheel broke. FAR 43, Appendix A (C).14 allows for owner replacement of seat belts FAR 43.13.(b) requires that it be ...
5
votes
1answer
454 views

How do I differentiate between different types of installed wire lock/safety wire on planes?

Common wire-locking/wire safe-tying materials used in aviation include copper, stainless steel, Monel and Inconel. Is there any way one can differentiate an installed stainless steel one from an ...
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0answers
46 views

May two different component manufacturers have the same component maintenance manual number?

Is it allowed for two different component manufacturer to have the same Components Maintenance Manual number?
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0answers
90 views

What is the FAA Approval Basis for an FMS upgrade on a Part 25 aircraft?

Does anyone know of a recent approval for an upgrade from a Universal UNS-xx FMS to a Universal UNS-1Ew FMS on a FAA registered aircraft, other than a TC, TC update or an STC? I am looking for the ...
3
votes
1answer
311 views

Is there any regulation on how often a private aircraft should be washed?

Is there any regulation on how often a private aircraft, such as a Cessna, should be washed?
5
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1answer
197 views

How to trigger warnings on an unplugged aural warning unit?

I got an old 80-0557-11 Rev A manufactured by Grimmes from an EMB-120 Brasilia, and I was wondering how to make it speak. I powered the component with a 28VDC power supply. It only said "Aural unit ...
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1answer
234 views

How does the idle mixture adjustment in a Stromberg NA-R9B float-type carburetor work?

At what temperature should idle mixture adjustments be made in Stormberg NA-R9B float-type carburetor?
3
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1answer
418 views

How does the idle speed adjustment in a Stromberg NA-R9B float-type carburetor work?

What is the purpose of the idle speed adjustment in a Stromberg NA-R9B float-type carburetor? In what situation do we adjust the idle speed?