22 votes

How can a pitot tube freeze when it's heated?

Captain Bill Palmer, in his book "Understanding Air France 447" has a section dedicated to answering that very question as it pertains to AF447. Although there is no way to know for certain he puts ...
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  • 27.7k
19 votes
Accepted

Why is fuel used as a hydraulic fluid?

The primary reason is availability -- the high pressure fuel pump is running whenever the engine is, while the airframe hydraulic systems may not be available in case of an accessory gearbox failure, ...
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17 votes
Accepted

Which part of aircraft is contributing the most weight of airplane?

Aerospace Engineering e-Mega Reference shows the following table for two aircraft (the large commercial jet, the B747-100, and the military jet, the C-5A). You can see that it differs quite a lot ...
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14 votes
Accepted

Is wheel well overheat detection (not brake temperature sensor) necessary for commercial jet aircraft?

What's the main purpose of this detection system even there are brake temperature sensors. Far more often than not, the need for brake temperature sensors is after landing to tell you how hot the ...
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10 votes
Accepted

Why are ARINC labels are transmitted LSB first?

Revised answer The ARINC 429 frame is composed of 4 bytes (32 bits numbered by convention 1 to 32 from right to left). Bits 11 to 29, which are the payload of the frame, can represent data using ...
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9 votes

What is an Enhanced surveillance system?

Enhanced Surveillance (EHS) is a variant of Mode S transponder protocol that includes Downlink Aircraft Parameters (DAP) in the information returned by the airborne Mode S transponder. Mode S can be ...
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7 votes

Do modern aircrafts like 747/787/A320/A380 have some Plug and Play subsystems/sensors?

It wouldn't make much sense. By definition "plug and play" would means that the avionics automatically and silently adapts to whether whether the optional device is present or not. This would mean ...
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6 votes
Accepted

What's the minimum timeline for fixing the issues/finding from NTSB/FAR?

That is up to the civil aviation authority, which in most countries is distinct agency from the investigation board (in USA this is FAA), to decide. They will take into consideration how likely the ...
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6 votes

What is the different between an aircraft engine gearbox and an aircraft engine transmission?

In aircraft, transmission usually refers to the whole system, that transmits power between two points, say between the MGB and the tail rotor. Gearbox is usually a component of the transmission system ...
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  • 98.7k
5 votes

What is an example of a system like MCAS?

Irrespective of 737 MAX MCAS, I haven't seen similar decision relying on a single sensor on 777 or on 757. Similarly I found nothing similar on Airbus 320, 330, 340, 350, or 380. On these Airbuses, 3 ...
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  • 1,722
4 votes

Do modern aircrafts like 747/787/A320/A380 have some Plug and Play subsystems/sensors?

I will answer this from a US FAA regulations stand point, but you really have 2 questions here Do modern passenger aircrafts like 747/787/A320/A380 have some sub-system The answer to this in ...
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  • 96.3k
4 votes

What is an example of a system like MCAS?

Speed Trim System (STS) is very similar to MCAS and is used on the same aircraft. Moreover, Boeing maintains that it did not have to notify pilots about MCAS because MCAS is a part of STS, running on ...
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3 votes

How can a pitot tube freeze when it's heated?

To answer your questions in order: 1) Pitot tubes are certified to withstand icing under particular circumstances: Within a given temperature range, precipitation amount, altitude etc. If they are ...
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  • 1,490
2 votes

Is the Dassault "ministop" related to the Dunlop Maxaret ABS?

This 1953 issue of Flight International mentions the Messier Ministop, it seems it was shown publicly for the first time at the Salon de Paris, July 1953: A particularly interesting development was ...
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  • 10.1k
1 vote

What is the different between an aircraft engine gearbox and an aircraft engine transmission?

A transmission is something usually used on a car. They have multiple "gears" that allow the engine to rotate at the same speed while the output rotates at progressively higher speeds. Airplanes don't ...
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  • 79
1 vote

What's the minimum timeline for fixing the issues/finding from NTSB/FAR?

It would depends on various factors. First is the severity of the issue. If it can cause a accident then the entire fleet of affected aircraft will be grounded until the fix has been certified and ...
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1 vote

Do modern aircrafts like 747/787/A320/A380 have some Plug and Play subsystems/sensors?

Plug and play is a standard developed by IBM and Microsoft around the time windows 95 was released. The old Plug N Play standard is an attempt to make device discovery and configuration a zero touch ...
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