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Questions tagged [boeing-707]

For questions about the Boeing 707 family of airliners, a series of narrowbody quadjets produced from 1957 through 1979.

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Can a B-707 recover from a spin? [duplicate]

There was an incident in 1959 involving a Boeing 707 on a training flight near Paris, France where a badly executed MCA demo reportedly resulted in the plane entering a spin, had an engine torn off ...
Roy Smith's user avatar
  • 121
2 votes
3 answers
317 views

Why no CFM-56 for the E3?

Why did the USAF not upgrade the E3 from TF33 engines to the CFM-56 like they did the KC135? From the Wikipedia page on the E3, the latter variants sold overseas had the CFM-56 from the factory and ...
RetiredATC's user avatar
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7 votes
2 answers
1k views

What is the difference between the series and parallel yaw-damper systems for the 707?

Some excerpts from the Pan Am 707 AOM indicate that the 707 can have one of two different yaw-damper systems, "series" and "parallel", with differing capabilities: YAW DAMPER The ...
Vikki's user avatar
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15 votes
1 answer
3k views

What are those half-vanes in the engine inlet of a 707-328?

I just saw this: Source They look like IGVs but I'm not sure. What could those be? Do you know the engine?
Roh's user avatar
  • 3,329
1 vote
1 answer
3k views

What is this mysterious thing on the vertical stabilizer of the Boeing 707?

Have you ever seen this mysterious line-shaped thing on the vertical stabilizer of a Boeing 707 or 720? What purpose does this thing do?
Pagong27Gaming's user avatar
5 votes
3 answers
1k views

Why is the 707’s yaw-damper-out lateral controllability marginal to nonexistent with flaps and spoilers extended?

According to the NTSB report on the 1973 crash of Pan Am Flight 160, the 707-300C1 has lateral controllability characteristics ranging from “minimal” to “none” if the flaps and spoilers are extended ...
Vikki's user avatar
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1 vote
0 answers
1k views

Why did the 707 and DC-8 continue to use the JT3D even after the JT8D became available?

Pratt & Whitney’s first-generation turbofan was the JT3D (a derivative of the company’s first-generation turbojet, the JT3C), which entered service in March 1961, and, due to its greater power and ...
Vikki's user avatar
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9 votes
3 answers
2k views

Why was the DC-8-70 successful, but not the 707-700?

The first high-bypass turbofan small enough to use on a narrowbody jetliner was the GE/SNECMA CFM56, which entered service in the late 1970s as an upgrade engine for the KC-135 tanker; Boeing almost ...
Vikki's user avatar
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45 votes
4 answers
14k views

What is this hole at the front of the engine pylon on a Boeing 707?

Images of the Boeing 707 show a hole at the front of the engine pylon just above the engine. Can someone please tell me what is the purpose? Also why do images show the hole absent on the left outer ...
Paul Howard's user avatar
6 votes
5 answers
7k views

4 Boeing 707 for $50,000. Is that possible?

I'm helping a friend with an article on some issues in my country, mostly related to corruption. His English isn't very good, so here I go One of the cases he's analyzing is the sale of 4 Boeing-707 ...
Devin's user avatar
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24 votes
1 answer
5k views

Was it possible to land a Boeing 707 with 300 feet cloud ceiling in the 70s?

In the movie Airplane! (1980), the main characters had to land a Boeing 707 in Chicago airport in low visibility. The dialog says the pilot "should be able to see the runway at 300 feet". Given the ...
kevin's user avatar
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4 votes
1 answer
480 views

How to identify a specific 707 variant?

I recently saw a very interesting documentary film made in 1980 about a narrowly-averted airline disaster in which the flight crew were incapacitated and a retired pilot, with the help of other crew ...
Daniele Procida's user avatar
14 votes
2 answers
3k views

Why did Boeing choose to give the Boeing 720 such a designation?

The Boeing 720 was a modification of the Boeing 707. Why was it given the unusual number of "720" instead of a "707-xxx" or "7x7" designation?
SMS von der Tann's user avatar
-3 votes
2 answers
7k views

How does a boeing 707 have 4 engines instead of 2? [duplicate]

I was reading a article Link It stated that lower bypass ratio jet engines have higher thrust than high bypass ratio engines, but the boeing 707 has 4 of these low bypass ratio engines and only ...
Ethan's user avatar
  • 9,349
11 votes
1 answer
2k views

Who operates a 707 with Boeing factory livery?

I have just seen a 707 depart from HTDA Dar es Salaam that has the tail painted with the Boeing colors. Any idea of who the plane belongs to? Livery like this one: Obviously 707 instead of 777 ...
Fabrizio Mazzoni's user avatar