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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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Why B737 CFM56 engine sounds like heavy wind sound at Throttling up?

14:14 ~ 14:21 : Throttle Up (with heavy wind sound 14:22 ~ 14:23 : Engine reached certain %, and no heavy wind sound 14:23 ~ : Throttle Up (with heavy wind sound) I always wonder why only B737NG with ...
Embraer's user avatar
  • 29
6 votes
1 answer
176 views

How and when are cockpits cleaned?

It's well known that cleaning the cabin of an airliner in the short time it is on the ground can be a challenging task for the cleaning crew. But what about the best seats in the plane, the cockpits? ...
doppelfish's user avatar
3 votes
0 answers
140 views

Multiple annual inspections failed to find a problem that is now showing up - is there any recourse? [closed]

I purchased a 1977 Cessna 150M about 3 years ago. The aircraft is currently undergoing an annual inspection. The inspector has determined that the engine serial number does not match the engine ...
Gary Moore's user avatar
1 vote
1 answer
232 views

Most Efficient Commercial Aircraft Design? [closed]

What was the most efficient aircraft design (based on factors such as lift, drag, and fuel consumption) but not developed or scrapped due to issues with long term viability and maintenance, operations ...
Gokul Nath KP's user avatar
1 vote
0 answers
67 views

How to calculate EGT Margin for P&W engines (PW1100g) ? (Theta parameter correction)

My goal is to obtain engine baselines and calculate EGT Margin for Pratt&Whitney PW1100g engines (specifically, PW1133GA-JM) I have a large dataset of engine reports recorded during takeoff. I ...
Bogdan's user avatar
  • 11
0 votes
1 answer
139 views

Radome replacement process for radome damaged by bird strike

Suppose a flight has a bird strike which requires the radome to be replaced. The aircraft is grounded at Chennai (MAA), India. What is the process of its replacement? Where will the new randome come ...
Navoneel Karmakar's user avatar
3 votes
1 answer
344 views

Overflying the 100 hour when airplane is not for hire

Suppose I have a 100 hour inspection at 2000 hours total time. From 2100 to 2190 the aircraft is not being operated for hire. If I then have a 100 hour inspection at 2190, when is the next due?
Chris's user avatar
  • 15.9k
3 votes
0 answers
343 views

Why are British Airways wings so dirty?

I often fly through Heathrow, and British Airways airplanes, particularly their 777s, always look so dirty. For example, there is often a kind of dark oily stain on the wings and flight surface. So - ...
natanijelvasic's user avatar
13 votes
1 answer
5k views

Passenger window insert pops out mid-flight

I was on a domestic flight from DCA to ORD in December on an Airbus A319. I was in row 31 and two rows ahead of me on the left side of the plane, I noticed while deplaning at ORD the passenger window ...
MJBS02384's user avatar
  • 131
7 votes
1 answer
2k views

Why does the typical magneto switch have R on the left and L on the right?

I can't think if I've ever seen this be done with the L on the left and theR on the right. Even on my Rotax 914, which is, *ahem*...
Kenn Sebesta's user avatar
  • 5,142
0 votes
1 answer
315 views

For transporting 4000kg of cargo via Mi-17 helicopter for 54 km, how much maintenance cost per flight hour will be incurred?

In a disaster response case study, I am using Mi-17 helicopters for relief supplies transportation in a challenging logistics environment. Regarding this, I want to check my estimates with the actual ...
Engr. Moiz Ahmad's user avatar
1 vote
1 answer
107 views

Reasons for ADSB PAPR Report Altitude Errors

We have just test flown a new 1090 ADSB installation, using Apareo Stratus ESG Transponder, which has internal GPS. The PAPR for the test flight show both Baro Alt and Geo Alt errors in the Missing ...
The Doc's user avatar
  • 41
7 votes
2 answers
2k views

Is 14.29 volts too strong for a 14V DC chronograph?

I've bought a Davtron model 811B aircraft clock (14 Volts), but my power source when measured with an accurate multimeter, reads exactly 14,29 Volts. Is that a problem? I mean is that tension (14,29 V)...
Leandro Marcos Evangelista's user avatar
1 vote
0 answers
51 views

Do I need any authorization to work and sign out performed maintenance on US-registered general aviation aircraft outside of USA? [duplicate]

I'm non-USA citizen and holder of FAA A&P Mechanic's certificate but haven't worked on US-registered aircraft since 1999 however all this time I'm involved in commercial aircraft maintenance and ...
Giorgi Nadibaidze's user avatar
6 votes
2 answers
3k views

Why might using flaps trip the breaker on a Cessna 172G?

Why does the breaker keep tripping when I try to use the flaps in my 1965 Cessna 172G? It’s a 15 amp breaker. After I reset the breaker, the flaps will go up but then the breaker trips when ...
C Pruette's user avatar
2 votes
0 answers
70 views

Difference in AMP and MPD between two aircrafts

Can two aircrafts such as the A320 and A330 have the same Maintenance Planning Document but different Aircraft Maintenance Program?
Engineer student's user avatar
20 votes
3 answers
7k views

Is Aeroflot flying airliners without brakes?

I have just read the news that the Russian flag carrier Aeroflot has deactivated the brakes on nine of its aircraft. Not to dismiss the journalistic talent behind these reports, but could it be that ...
Quora Feans's user avatar
  • 3,681
3 votes
0 answers
114 views

Does flying a plane mid-annual inspection somehow reset the inspection?

(This question concerns only an airplane which does not have an expired annual.) Let's say that the IA started an annual, lubed some joints, inspected some parts, and then, for whatever reason, flew ...
Kenn Sebesta's user avatar
  • 5,142
1 vote
1 answer
101 views

How would you know if there was an AD issued for an aircraft?

How would I know if an AD was issued? Is this information only given to owners of the aircraft? Or must you sign up with the FAA or Manufacturing company to get emails about that sort of thing?
youngpilot's user avatar
1 vote
2 answers
166 views

COM Transceiver problem and SWR test

I have a VHF COM problem. I have a new composite structure aircraft (a Berkut) with an older VHF transceiver, (a Bendix King KX-155 TSO), that has significantly reduced range in certain situations. ...
Charles Bretana's user avatar
4 votes
4 answers
361 views

What, if anything, could actually cause one helicopter blade to be more eroded than the others?

Does this scenario in which one blade is more eroded then the others commonly occur with real helicopters? Even if it does, Julio's explanation is obviously wrong; what actually causes it?
Someone's user avatar
  • 7,097
9 votes
2 answers
4k views

Why did older versions of B747 use radioactive material?

What was its purpose and in which part of the aircraft was it being used?
Ludwig T's user avatar
  • 389
4 votes
2 answers
1k views

Where are aeroplanes sent to if they are not be used for periods more than 3 years?

We were looking at the type of facilities and the sort of suitable environments/and or conditions for aircraft storage and a part from "indoor" it was mentioned that places that are humid is ...
Ludwig T's user avatar
  • 389
0 votes
0 answers
37 views

Vis-a-vis maintenance and spare parts, what are a type certificate holder's "regulatory obligations"

This conversation came up when the owner of an out-of-production airplane from a still-in-business manufacturer lost his gas cap. The manufacturer didn't have a spare part and refused to take an order ...
Kenn Sebesta's user avatar
  • 5,142
1 vote
1 answer
106 views

Authorization of repairing engine blade nicks

Since blade nicks repair considered as a major repair, I would like to ask, 1- Who is authorized to repair engine blade nicks? 2- Could a mechanic with powerplant rating do the repair? 3- Could a ...
Mohammed Barashi's user avatar
1 vote
1 answer
176 views

soot on a plane

This is the nacelle (?? I guess, I'm just someone who takes plane trips ??) of a DeHavilland Dash 8-400 that I flew on (as a customer) from Toronto to Boston last week. I noticed the soot around the ...
Ben Bolker's user avatar
8 votes
4 answers
4k views

Can you weld a propeller blade from 120 degrees to 180?

My uncle flew for Mission Aviation Fellowship (maf.org) for a university in Texas, and I believe that he was flying a Cessna to the Amazon (among other places). He actually knew Jim Elliot (who went ...
MicroservicesOnDDD's user avatar
0 votes
1 answer
152 views

twist correction of fan blades

How can the blade's angle be effectively adjusted to meet prescribed tolerances during shop repairs? I am conducting a research paper on aircraft engine blade maintenance, and I have encountered ...
ken ken's user avatar
2 votes
2 answers
297 views

Can I fly a checkride with inop vacuum indicator and attitude indicator in a TAA plane?

I have a checkride coming up and I will be taking it in a TAA plane. The vacuum indicator and attitude indicator are both inop and marked as so, but was wondering if it is still okay to fly for a ...
ambic's user avatar
  • 21
1 vote
1 answer
164 views

Statistically, Is engine calendar TBO honored more in the breach or the observance?

Surprisingly to me, Lycoming and Continental engines have a recommended overhaul interval (TBO) of 12 years, while Rotax engines have a 15-year TBO. This suggests that engines should undergo frequent ...
Kenn Sebesta's user avatar
  • 5,142
1 vote
1 answer
260 views

What is required to get back into aviation?

I stopped working as an airframe & powerplant mechanic back in December 2010 to pursue other goals. I still have my A&P but have not been active in aviation since then, I’m considering going ...
EMore82's user avatar
  • 21
9 votes
3 answers
2k views

What does Line imply in Line Replaceable Unit?

Does line indicate the aircraft is lined up in hangar (!) and maintenance crew can replace it? Or does it mean something else? Wiki talks about operating location and distances.. What is that?
Dynamic_equilibrium's user avatar
0 votes
0 answers
67 views

What is proper procedure for entering iterative test flights into the aircraft's logs?

Let's say that I'm working on a problem which requires in-flight troubleshooting in an iterative process of multiple flights, for instance working on engine cooling baffles. Does each iteration, no ...
Kenn Sebesta's user avatar
  • 5,142
0 votes
0 answers
303 views

Is it against the regualtions to install a dummy set of landing gear during aircraft maintenance?

We will be removing a set of landing gear for overhaul, so we are arranging a set of unserviceable landing gear to keep the aircraft mobile. I would like to know if doing so is against any FAA or EASA ...
Ng Wilson's user avatar
13 votes
1 answer
3k views

What to do when an AD is published but your aircraft is nowhere near a maintenance facility?

If an Airworthiness Directive is published for your aircraft which makes it illegal to operate until complied, and your aircraft is sitting in the Alaskan wilderness with the closest facility hours ...
Jordan's user avatar
  • 131
3 votes
1 answer
451 views

Is silk thread still being used to prevent oil loss from Lycoming engines?

A teardown/rebuild video of a Lycoming O-360 showed the mechanic laying silk thread along a path where 2 engine parts were to be bolted together$^1$. This would be, in addition to a gasket, to ...
Robert DiGiovanni's user avatar
45 votes
1 answer
9k views

Why did my flight leave the gear down for the first 10 minutes of flight? [duplicate]

This morning, I took flight VS156 from LAS to LHR, aboard a 787, tail number G-VSPY according to flightradar24. The pilot made a strange announcement before takeoff - specifically, that due to a ...
catalogue_number's user avatar
7 votes
2 answers
2k views

What is this hole at the bottom of the DA40NG body?

This is the bottom of the fuselage of a DA40NG aircraft and where the right wing attaches to the fuselage. What is the thing I'm pointing at with the red arrow in the picture? As it is written in the ...
pilot162's user avatar
  • 2,207
-1 votes
1 answer
118 views

FMC and MCDU not talking

I have a test bed in which the FMC and MCDU are hooked up to one another. FMC menu was populated on MCDU and was able to be navigated. After making some changes to the FMC GPS #2 lines, the FMC ...
Ace's user avatar
  • 1
2 votes
0 answers
95 views

Is there historical evidence whether or not FAR §21.9 applies to owner-manufactured avionics?

Looking at an explanation of §21.9 (formerly §21.303(b)2), it seems very straightforward for an owner to produce a part for an ...
Kenn Sebesta's user avatar
  • 5,142
5 votes
0 answers
320 views

Why is this placard on a Boeing 737 NG?

I was working on the cockpit of a Boeing 737 and was intrigued when I saw this placard. From what I know this has to do with Citibank being a lender or something along those lines. Why would this be ...
Enzo C.'s user avatar
  • 185
2 votes
1 answer
174 views

Faults on Gulfstream G550/C-37B repairable in < ~3hrs without aircraft specific tools or spares?

Endeavouring to meet your requirements for specificity. brevity, question as title, etc. I am an author seeking a realistic fault/issue for a Gulfstream G550/C-37B meeting the following criteria: 1/ ...
Julian Moore's user avatar
5 votes
0 answers
105 views

How dangerous (or not) are some synthetic types of aviation hydraulic fluids based on organophosphates?

Insider's January 13, 2023 Gerard Butler says he mistakenly rubbed acid all over his face while filming 'Plane' and didn't realize until he was 'burning alive' links to the Late Night with Seth Meyers ...
uhoh's user avatar
  • 5,934
15 votes
3 answers
5k views

Can I become an aircraft technician if I have color-blindness?

Are there any restrictions imposed by any aviation-authorities that would prevent a color-blind person from becoming an aircraft technician?
Jibi's user avatar
  • 151
0 votes
0 answers
78 views

I need help with this dent classification rule

I'm an Aerospace Engineer from Chile, and I have the following reference issue: Supposedly there's a damage rule related to dents on aircraft skin that says If the distance between two dents is lower ...
Jota243's user avatar
2 votes
1 answer
351 views

What kind of maintenance is involved when an airframe has been overstressed (E.g. an F/A-18)?

In the movie Top Gun 2, the main character Over-Gs his aircraft (I think, an F/A-18 Hornet to around 10G). From a maintenance perspective, what steps have to be additionally performed in order to get ...
U_flow's user avatar
  • 3,840
1 vote
0 answers
158 views

What are the procedure for a B747-400 wheel change?

And what are the required tools? I am fascinated by how you do a B747-400 wheel change.
Miyo Hazuki's user avatar
2 votes
1 answer
107 views

Are maintenance manual airframe lifetime limitations binding?

An IA told me that component lifetime limitations, even when published in the Airworthiness Limitations section of the service manual, are not binding. They can be ...
Kenn Sebesta's user avatar
  • 5,142
1 vote
1 answer
1k views

What does the Permanent Magnet Alternator do exactly and how works?

From T6b Naval manual: A dedicated permanent magnet alternator (PMA), mounted on the reduction gearbox, powers the PMU. The PMA supplies 32 VAC, which the PMU converts to DC. The PMU automatically ...
YamchaAviator's user avatar
0 votes
0 answers
109 views

where is the centrifugal force the flyweights experience coming from?

The T6b uses a PT6-68 engine which has a variable pitch, constant speed, feather, and non-reversible prop system. There is only one lever in the cockpit which regulates Torque and the Power Management ...
YamchaAviator's user avatar

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