Unanswered Questions

1,281 questions with no upvoted or accepted answers
16 votes
0 answers
728 views

What causes the "dead band" phenomenon during takeoff on the Boeing 737?

During takeoff, the Boeing 737 encounters a distinctive "dead band" phenomenon after the initial pitch reaches approximately 10 degrees. Essentially, a slight increase in back pressure is ...
13 votes
1 answer
1k views

Is there a good source for estimating the per unit cost breakdown for a classic GA plane like the Cessna 172?

For instance, on a Cessna 172 what percent is spent on: Raw materials Labor actually manufacturing the plane Testing the completed individual planes R&D Making the plane (at this point, very ...
11 votes
3 answers
1k views

Do aircraft using only spoilerons for roll control, with no conventional ailerons, have a crossover airspeed?

Airplanes generally have a crossover airspeed (a minimum airspeed below which directional control of the airplane cannot be maintained in the event of a rudder hardover). This is because, as airspeed ...
10 votes
0 answers
390 views

Who is this flyer seen in Oakland c. 1929?

Looking for identification of the man on the left. Second from left is W.A. "Sandy" Sanders, third is Denny Wright, and fourth is Clyde Sunderland. Oakland, around 1929.
9 votes
2 answers
753 views

Do constant maximum lift to drag ratio variable pitch propeller exist?

Are there variable pitch propellers, where pitch is set so that the blades constantly are at their maximum lift to drag ratio AoA, whatever the incoming relative wind speed & direction? Such a ...
8 votes
0 answers
203 views

How to interpret flight schedule data from before 1987

I'm trying to interpret schedule data from before 1987 (see example). Example line: ...
8 votes
0 answers
686 views

How did Soapy get to fly Hornets?

Allegedly, in early June 1983, while flying a Sea Harrier during a NATO exercise off the coast of Portugal, Royal Navy's Sub-Lieutenant Ian "Soapy" Watson found himself in a rather ...
8 votes
0 answers
721 views

How can I convert a frozen ATPL from South Africa to an Iranian one?

I have got a frozen ATPL license from South Africa and I'm from Iran. I came back home last year and I have converted my CPL/IR license to the Iranian piloting license by doing Air Law and Human ...
8 votes
3 answers
825 views

Under FAA rules, can a private pilot act as PIC in aircraft furnished by someone else if they're not otherwise compensated?

Let's say I'm visiting a friend who happens to own an airplane, and I happen to be a private pilot holding a valid FAA PPL, as well as being familiar with the make and model my friend owns. Suppose my ...
7 votes
0 answers
142 views

ADIRU Mounting in Avionics Rack

If I understand correctly, navigational gyroscopes and accelerometers are located within the ADIRU boxes themselves. In order to initialise during aircraft startup, they must be mounted precisely ...
7 votes
3 answers
670 views

Who was the first person to break the sound barrier?

In this video on Wikipedia of Chuck Yeager breaking the sound barrier in the Bell X-1 in level flight, at 2:44 the narrator says "For the first time, except in dive, a man has flown an airplane ...
7 votes
0 answers
538 views

Boeing 737-800 Source Off Light and Flight Director Bias Out Of View Function

I have seen the following occur during simulator events. With a left Source Off light illuminated and the captain's autopilot and autothrottles engaged (or re-engaged): Captain's flight director ...
7 votes
0 answers
493 views

Which individual airframe has carried the most passengers in its lifetime?

I'm guessing that the airframe will be one of the 747s that service the domestic Japanese market, making regular short hops full of passengers - but perhaps actual figures exist to confirm this. See ...
6 votes
0 answers
313 views

Why do the spoilers on the 737 only deploy to the flight detent after a flaps up landing?

Following an all flaps up (no flap) landing, the SPEED BRAKE lever will not move beyond the FLIGHT DETENT and the spoilers will not fully deploy (for reference this is stated in the Fcom 9.20.14 rev ...
6 votes
0 answers
129 views

Are there any analyses of GA tie-down failures?

After a big harbor storm, there are frequently analyses of why boats break free of their moorings. This information is used to improve upon best practices, resulting in fewer boats breaking free and ...

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