Questions tagged [modifications]

Questions relating to aircraft modifications

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19
votes
1answer
3k views

What is the upper deck on converted freighter long-hump 747s used for?

All 747s1 have an upper deck directly behind the elevated cockpit, a legacy of the 747’s genesis as a design for a strategic-airlifter competition (the upper deck and elevated cockpit were partly to ...
0
votes
0answers
85 views

What modifications/upgrades were done to US MD-80 fleet?

I have often heard stories about how most of the MD-80 fleet that are being retired in the US were modified and upgraded. What were the modifications or upgrades done?
3
votes
1answer
369 views

Why were most of the first-generation-Learjet wing mods never approved for the Learjet 23?

First-generation (straight-wing1) Learjets (the 23, 24, 25, 35, and 36) are, rather infamously, beasts to fly, due in part to their hideous stall behaviour;2 due to their flow-separation-prone laminar-...
2
votes
2answers
351 views

At what point does an aircraft need a new type certificate vs a STC?

First post. Yes, I did search but this specific question has not been asked before. This answer is close, however: How does a mechanic determine if a repair or alteration requires a Supplemental Type ...
0
votes
1answer
128 views

Why was the 307’s pressurisation system removed when it was modified into the C-75, despite the fuel-burn advantage of higher-altitude flight?

The Boeing 307, an airliner derivative of the B-17 heavy bomber, was the first pressurised airliner to enter series production and go into service (hence its bulbous, altogether un-B-17-like fuselage, ...
3
votes
1answer
157 views

How to modify an amateur kit build with wing hard points

I plan on modifying an amateur-built all-metal kit plane so it has a hard point under each wing where various external loads (cameras, probes, etc) can be fitted to (university research). The location ...
3
votes
1answer
246 views

What about the DC-9's wing makes wingletting it so difficult?

A common way of making older airliners more efficient without increasing their wingspan is to add winglets, either as a retrofit for existing aircraft or as a new, wingletted derivative of a ...
3
votes
2answers
84 views

How can I calculate the speed gain from using multiple STC modifications together?

Looking at a parts manufacturer website, they list various STC'd modifications for Mooneys with estimated (cruise?) speed gains for each. However, I've heard that those gains are not additive. For ...
0
votes
1answer
142 views

Would this modified tire work to prespin an aircraft tire? [duplicate]

In order to decrease that initial hit of the tire spinning up to ground speed on the runway, could adding a blades or shape into the tire rim of a commercial plane save on tires by prespinning the ...
14
votes
1answer
816 views

Did the FAA order the installation of “Cooper vanes?”

On November 24, 1971, a man hijacked a Boeing 727 and parachuted away, never to be found. According to Wikipedia, this prompted (together with 2 other hijackings) the installation of "Cooper vanes" ...
1
vote
2answers
442 views

A modern replacement for DH.82's Gipsy Major engine

While I deeply appreciate any vintage aircraft that is powered by their original engines, I was wondering if there are any modern replacement engines available for the de Havilland Tiger Moth aircraft ...
-3
votes
1answer
383 views

private jet based of an sr 71 [closed]

could a private jet be based of an SR 71 blackbird. By this I mean similar styling and shape. Would this be a good basis to make a private jet super sonic (disregarding sonic boom). What would the ...
5
votes
2answers
1k views

How to record flights and cockpit radio com using an Android phone?

I am a student pilot, and would like to record my training flights (in a C152) to look back on. I do not have a Go-Pro, and do not want to fork over the money for one. I do however, own a Samsung ...
13
votes
1answer
4k views

How can I mount my iPhone 6 in the cockpit to record my flights?

I am a student pilot, and would like to record my training flights to look back on. I do not have a Go-Pro, and do not want to fork over the money for one. I do however, own an iPhone 6, that has a ...
3
votes
1answer
832 views

Can one make an electric-sailplane from transparent carbon fiber?

Is it technically feasible to make a sailplane from transparent carbon fiber? I am looking for an answer based on the specifications' comparison of the 2 different fibers. And can it be made self-...
10
votes
2answers
580 views

Can a modified aircraft be imported and certified in the US?

Aircraft can be brought into the US and be made airworthy by FAA standards. What about aircraft legally modified in other countries? For example, there is a new STC to put a Rotax 912 into Cessna ...
10
votes
1answer
4k views

What regulations surround fitting aftermarket fuel tanks inside the cabin?

Watching the first episode of Dangerous Flights, a ferry pilot has aftermarket fuel tanks fitted inside the cabin of an old Merlin IIB: What are the regulatory requirements to be able to do this? / ...