All Questions

45
votes
3answers
4k views

What is the offset in a seaplane's hull?

I noticed there is a little offset in a seaplane's hull (highlighted in the following picture). I suppose this is useful as it exists in all the seaplanes I know. It appears to be neither a ...
7
votes
2answers
952 views

Which models of the Boeing 737 are still in production?

The BBC is reporting that the production of 737 aircraft has been reduced from 52 to 42 per month due to a loss of 737-Max orders. It isn't clear in the report whether the Max is the only 737 being ...
2
votes
0answers
116 views

Can a plane help a second aircraft with landing gear issue mid-air?

My Father received his flight training in the Navy in 1941. He flew mostly Curtiss Wright SNC's (a model of the CW-22) and Grumman F3F's. The story I was told is hard to believe, so I'm hoping that ...
1
vote
2answers
101 views

How does engine geometry affect flight stability?

News items around the recent aviation accidents involving Boing 737 MAX 8 aircraft suggest, that bigger engine diameter demanded for a different (longer) nacelle strut for proper ground clearance ...
2
votes
1answer
155 views

What does the preliminary report on the Ethiopian B737 MAX accident show? [closed]

In early April the Aircraft Accident Investigation Bureau of Ethiopia released a preliminary report on the crash of Ethiopian Airlines flight 302 that happened on March 10, 2019. There apparently is ...
1
vote
0answers
43 views

Is an EASA flight school required to give me my training records if I leave?

I am having troubles with my flight school in Austria/Europe. So I want to change school but the school won't give me my training records so I can't finish my training somewhere else. Is there any ...
1
vote
1answer
69 views

What's the difference between 'modification' and 'corrective action' in an AD or SB?

For example Modification of an airplane in accordance with the instructions of the specific SB as specified in Table 1 of this AD, as applicable...
3
votes
2answers
207 views

Why would Boeing's MCAS be preferable to a modified Feel and Centering Unit?

According to some sources, the purpose of MCAS on Boeing's 737 MAX variants is to increase the back-force needed to further raise the nose when flying manually at high angles of attack, in order to ...
4
votes
3answers
252 views

What is the meaning of “Steer 1-2-0” in WWII texts?

I am reading some texts about WWII and English operators tell the pilots to "Steer 1-2-0". Can anyone help with the meaning of 'steer' here? Is it a synonym of 'direction', 'heading' or 'vector'?
4
votes
1answer
66 views

To use the equipment suffix “G”, does the GPS have to be certified for IFR?

To use the equipment suffix "G", does the GPS have to be certified for IFR flight?
1
vote
1answer
42 views

How can I calculate a gradient using a Jeppesen Student Flight Computer?

On a Jeppesen Student Flight Computer (CSG), how does one calculate the gradient in percentage if the ground distance and height above ground level are given? I can't find anything in the ...
12
votes
1answer
2k views

What does the “remote control” for a QF-4 look like?

As I understand it a QF-4 is a Phantom which is converted to a remotely controlled plane for use in weapons testing. (Apparently in non-destructive runs, a pilot is still on board for safety, ...
-1
votes
1answer
164 views

Weird seat numbering on Boeing 737-800 [closed]

I recently flew in a Boeing 737-800 in Thailand. My seat was 53K so I thought: "That's a big plane for such small domestic travel." When I entered the plane however I discovered that seats start at ...
1
vote
1answer
79 views

Is there an increased concern for stall safety in a 1G steep turn?

Most people know the standard, "At a 60 degree bank, an aircraft experiences 2G's" checkpoint for load-factor on an airplane. I assume that this statement has an underlying, unspoken assumption that ...
3
votes
1answer
132 views

Do aircraft engineers take into consideration engine placement to avoid ground strikes in a cross-wind landing?

On a multi-engine airplane with wing-mounted engines, do aircraft designers have a standard way of ensuring that the banked landings associated with cross-wind's do not cause a prop or engine-housing ...
5
votes
2answers
196 views

Do carrier-borne aircraft pilots count the seconds on the downwind leg of the carrier?

On carrier landing, someone tells me that the pilots need to count several seconds on abeam leg of the landing pattern, in order to land precisely on the flight deck. Is that true? What do we call for ...
1
vote
2answers
57 views

How does the advancing wing in a flat spin create nose thrust?

Peter's answer to this question leads me to another question. How does the advancing wing in a flat spin create nose thrust? I imagine this like some object spinning in a liquid. I would think ...
2
votes
1answer
100 views

What happens if full collective pitch is suddenly commanded on most modern helicopters?

Related, but not the same: What happens when you apply full cyclic + collective? If the pilot suddenly applies full collective pitch on a turbine powered helicopter, will the engine stall? It seems ...
0
votes
1answer
80 views

What are the characteristics of the F-16 airframe lifetime?

What limits the lifetime on the F-16 airframe? I assume it is material fatigue, but what kind, and where on the airframe? Moreover, what exactly happens? What will happen if this problem is ignored? ...
3
votes
1answer
125 views

What's preventing aircraft manufacturers to record every single possible value in FDRs?

The preliminary report of the ET302 crash included some data from the Flight Data Recorder. However, the position of the trim cutoff switches is apparently not among the recorded values. Given that ...
14
votes
4answers
3k views

In a spin, are both wings stalled?

I missed a test question which asked that if an airplane was spinning to the left which wing was stalled. The supposed correct answer was that both wings are stalled (I had answered that the left ...
5
votes
1answer
178 views

Is a FAA certified plane allowed to fly everywhere in the world?

following the debate about FAA and Boeing certification practices, I was wondering whether Europe could potentially require the Boeing 737 Max to be certified by a European agency. Is a FAA ...
0
votes
2answers
105 views

Flight plan departure procedures vs real life departure procedures

In the flight plans there are included departure procedures. However, sometimes something can change eg. different runway is assigned by ATC and then departure procedures in the flight plan is invalid,...
6
votes
1answer
187 views

Twin engine helicopters: is the throttle controlled separately for each engine or together?

There is usually a twist throttle on the collective for a single engine helicopter. On twin engine helicopters, does the twist throttle control it for both engines, or just for one?
5
votes
0answers
642 views

Is it unprecedented for an F-16 to get hit by its own bullet(s)?

According to Dutch state broadcaster NOS, an F-16 was hit by its own bullet(s) in a training exercise: De F-16 die in januari aanzienlijke schade opliep tijdens een oefening boven Vlieland blijkt ...
2
votes
1answer
315 views

Why do Airbus and Boeing have different approaches to bleed air systems? [closed]

Reading Wikipedia and other questions like this, made me curious as to why Boeing uses bleedless architecture for its B787, while Airbus thinks differently for its A350 XWB (and Rolls-Royce thinks the ...
2
votes
1answer
48 views

Why does FAA not include certain SIDs and STARs in its CIFP file, even though they are regularly used in flight planning?

I was correlating the instrument flight procedures found in flight plans from 1st April 2019 with the ones included in FAA's CIFP database. I noticed that in those flight plans there are some SIDs and ...
8
votes
5answers
5k views

Has there ever been an airliner design involving reducing generator load by installing solar panels? [duplicate]

Has there ever been a trial/project/design, in which solar panels were incorporated in the design of a commerical airliner (e.g. on the wings), with the aim to reduce fuel consumption by lowering the ...
15
votes
2answers
4k views

Why are the 737's rear doors unusable in a water landing?

The 737's rear exit doors cannot be used to evacuate the aircraft in the event of a water landing, as shown, for example, in this safety card: (Image from flight-report, via Jordy here at AvSE.) In ...
1
vote
1answer
57 views

What is the ratio of Commercial + ATP pilots with employment as pilots in the US?

Of all certificated commercial/ATP pilots in the US under the age of 65, how many are employed in full-time pilot roles vs commercial/ATP pilots with some other profession than a pilot?
1
vote
1answer
214 views

Why can't the 737 MAX's horizontal stabilizer autotrim be cut out by control yoke inputs?

According to this article, a horizontal stabilizer runaway on the 737 MAX, unlike with all other 737s, cannot be countered with yoke inputs: Older 737s had another way of addressing certain ...
5
votes
1answer
113 views

When, exactly, were the DC-8’s airbrakes removed?

The DC-8 was originally equipped with airbrakes on the lower rear fuselage, but these were quickly removed. Wikipedia says that they were removed before the DC-8 entered service: [...] Douglas ...
2
votes
1answer
142 views

Vintage army Kollsman altimeter - any info?

I have a vintage Kollsman altimeter A.C. U.S. Army. I can't read the text on the front because of the needle arms are in the way, but might state: Type 5 Serial No A 464. Back plate is very hard to ...
0
votes
1answer
74 views

Can we use ECI coordinates for an airplane?

It is taught for navigation systems (like an airplane) on Earth we us ECEF (earth-centered, earth-fixed) and for space systems (like a satellite) we use ECI (earth-centered inertial). But why is ECEF ...
0
votes
2answers
78 views

Why there is a 'MACH' in this Compressibility Correction Chart?

I couldn't find what 'Mach 1.0' and 'Mach 0.8' are trying to indicate in the middle of the chart. Can anybody explain about this please?
0
votes
0answers
25 views

Has FAA published any A-RNP STAR or A-RNP / RNP AR DP SID?

After reading FAA's Performance Based Navigation Strategy 2016, I tried to search for already published Departure Procedures of RNP specification. I could only find some that require RNP-1, even ...
-1
votes
1answer
146 views

What does the ATC term “a company traffic” mean? [duplicate]

During my flight training I often heard the term "a company traffic" in radio calls from the ATC like: N123AB a company traffic is joining downwind runway 24 ...
0
votes
1answer
74 views

Is there a way to calculate the perfect angle of incidence of a horizontal stab for a given airspeed?

I have a Grumman AA1. It’s been modified several times through stc’s to increase power and speed. The aircraft requires full nose down trim to fly level in cruise. Is there a way to calculate the ...
0
votes
1answer
123 views

What is the meaning of AFT in airworthiness directives?

What is the meaning of AFT in airworthiness directives?
1
vote
0answers
26 views

What is the name of the format of route with the dots? Eg. DTW..LAYNE.DXO006 (…)

I found in our data a route formatted with dots instead of spaces and DCTs. Example: DTW..LAYNE.DXO006.BNNET.YQG341.DIRKS.J38.GRB/0052 What is the name of this format? Second question: Sometimes ...
0
votes
1answer
57 views

What is the difference between an RPL and a PPL licence?

I am looking forward to starting my training to get my RPL license and I was wondering what the difference was because on the website it looked like you have to do 2 different pieces of training for ...
5
votes
1answer
180 views

What safety issues led the FAA to ban Constellation flights into/out of the U.S.?

Although the Lockheed Constellation (like the other late, large piston airliners) was superseded in the 1960s and 1970s by newer jets (plus turboprops for shorter/lighter routes), it hung on into the ...
0
votes
0answers
22 views

Do ARFF units need special equipment for responding to crashes or fires involving piston-engine aircraft?

Unlike jets and turboprops, which generally burn (relatively) benign jet fuel (usually a straight kerosene, occasionally with plain gasoline blended in as a freezing-point depressant), piston-engined ...
3
votes
1answer
88 views

Do different grades of leaded avgas differ in ways other than their lead content?

Although only one grade of leaded avgas (100LL, standing for 100-octane, Low-Lead)1 is in common use today, there were formerly a number of different leaded avgasses with higher octane ratings and ...
0
votes
1answer
36 views

Can one use a calculator for the EASA part 66 exam?

For the first 3 modules you will need to do some calculations, is a calculator allowed?
1
vote
1answer
91 views

If a CDI needle is deflected to the right, why is the aircraft off track to the left?

Consider a CDI as shown below. If the CDI is set to FROM and the selected course is north, but the needle indicates three dots to the right (each dot signifying a 2 degree deviation from the selected ...
0
votes
2answers
52 views

How does Mass affect rate of turn?

After seeing effect of speed and bank angle on rate of turn, how would one mathematicly calculate the effect of changing mass. For example, in a 30 degree turn at 100 knots, how would the rate of ...
3
votes
0answers
45 views

What happens when a person dies during the flight? What kind of procedures exist regarding deceased passenger on board? [duplicate]

I was just reading about a young woman who died on the long haul flight from LA to Melbourne. Heartbreaking. Young life cut short. RIP. But this horrible situation made me wonder about a presence of a ...
9
votes
0answers
109 views

May a student continue a discontinued checkride if the CFI who endorsed them voids that endorsement?

The Situation CFI Charlie endorses Student Sara's logbook for a checkride. Sara begins the checkride but discontinues, and receives a letter of discontinuance. So far so good. Before Sara can ...
12
votes
5answers
6k views

Why didn't Boeing produce its own regional jet?

Boeing, although it produced many larger narrowbodies, never designed its own regional jet; the only regional jet it ever produced was the DC-9 (from 1997 through 2006, in the DC-9-80 and DC-9-90 ...

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