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51 votes
Accepted

What is the purpose of the Dash 8’s “TOUCHED RUNWAY” warning light?

The light is a tail-strike indicator. Touched Runway system The Touched Runway system provides a warning light in the flight compartment. It illuminates when the aft fuselage ...
Transistor's user avatar
  • 1,246
31 votes
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Why are propellers de-iced before the engines are started, and does ice on the fuselage affect the flight characteristics of the plane?

The props are done before starting because you need to make sure the blades and spinners are fully cleaned off while they are stationary. Otherwise, they'd vibrate like hell when starting and shed ...
John K's user avatar
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26 votes
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Why is this screw on the wing of DASH-8 Q400 sticking out, is it safe?

It's not a screw, it's a drain line for the engine tail pipe, for fuel that can collect in the tail pipe during "wet" starts. There are other drains for the various engine and propeller ...
John K's user avatar
  • 132k
24 votes

What is the purpose of the Dash 8’s “TOUCHED RUNWAY” warning light?

To supplement Transistor's answer: The reason for the light is that tailstrikes are very easy to do on the 400 due to the stretch of the rear fuse with not enough landing gear lengthening to ...
John K's user avatar
  • 132k
22 votes
Accepted

Landing gear: why is there a maximum altitude for safe retraction?

You can find the actual ATSB report here and that information was pulled right from it, they are not mis-types: The report goes on to state (bolded for emphasis): The operator advised that, although ...
Dave's user avatar
  • 101k
18 votes
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What is this on the starboard engine of the Dash 8?

It is the engine drain mast. From the Dash 8 Series 400 airport planning document - Chapter 2, Page 40: Dash 8 engine drain; image from Dash 8 Series 400 airport planning document Basically, the ...
aeroalias's user avatar
  • 100k
11 votes
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How is the Dash 8 Q400 so fast?

Here are the cruise performance tables for the Q400 at the heaviest and lightest weight (click to view larger): Source: from the Dash-8 Q400 performance manual, which came included with a simulator ...
Bianfable's user avatar
  • 56k
9 votes

Landing gear: why is there a maximum altitude for safe retraction?

This wording implies that there is some danger of retracting the gear above a certain altitude. Is this the case, or was this just sloppy language and the danger is actually in flying above a certain ...
quiet flyer's user avatar
  • 22.7k
6 votes

Dash-8 Speed momentarily drops on takeoff

The aircraft ground speed will continuously increase during the takeoff roll and then remain constant or only change slightly during the initial climb. The speed should never decrease during these ...
Bianfable's user avatar
  • 56k
6 votes

Why are propellers de-iced before the engines are started, and does ice on the fuselage affect the flight characteristics of the plane?

Ice flying off the propellers can damage something, or someone. Also unbalances the propeller assembly overall, leading to vibrations. Little bit of ice left on the fuselage is not bad, only causes ...
CrossRoads's user avatar
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6 votes
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Why should autofeather only be used for take off on the Dash-8 Q400?

It's because the critical case that autofeather caters to is engine failure right after V1, on takeoff, where the normal identify/feather drill uses up precious time. An engine failure on a missed ...
John K's user avatar
  • 132k
5 votes

What do the various lights in the overhead aisle light cluster of a Bombardier Q400 NextGen represent?

This is the so called "area call panel" and it is indeed used to signal the cabin crew. The colours and their respective meaning is not regulated and depends on the aircraft and aircraft ...
mike's user avatar
  • 2,170
5 votes

What is the use of this object in the cockpit of a Bombardier Dash 8 Q400?

It is a mechanical checklist where each item on the list can be flipped to indicate that is has been checked. You can see it in operation in this YouTube video (which I believe is where you got the ...
Bianfable's user avatar
  • 56k
5 votes
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Why is Bombardier selling off all of its airliner series?

It's important to understand that Bombardier Transportation/Aerospace, while ostensibly a company separate from the original Bombardier family (which only retained a minority stake when it was split ...
John K's user avatar
  • 132k
4 votes

Why is Bombardier selling off all of its airliner series?

The reason they are selling aircraft manufacturing lines to improve profit margin is because their aircraft business has a relatively low-profit margin. One of Bombardier most successful products is ...
DeltaLima's user avatar
  • 83.5k
4 votes

What is this on the starboard engine of the Dash 8?

It's a drain, as explained previously... PW100 series tend to leak a lot of oil as part of their design, so this is a drain where leaks from normal, healthy, places can come out. The design of the ...
Qwerty CS's user avatar
4 votes

Landing gear: why is there a maximum altitude for safe retraction?

I should start with the remark that I have no flight experience or education whatsoever. But after reading the ATSB report I have a plausible theory about the limits. Generally, limits for operating ...
Peter - Reinstate Monica's user avatar
3 votes

What is the purpose of this delay in the engine start procedure of the DHC-8?

The Flight Guidance Computers are powered with DC off the applicable Main DC buses via feeder circuit breakers to the avionics circuit breaker panels. The FGCs also get fixed frequency 115VAC from the ...
John K's user avatar
  • 132k
3 votes

What is NH overspeed test and how it is preformed on DHC Q400 aircraft?

The same statement is made here in a document describing the PW150 turboprop engine, which powers the de Haviland Canada, now Bombardier, Dash-8. It gives a little more detail in section 12.23.14.4,...
Penguin's user avatar
  • 4,483
2 votes

What high-lift devices are used on the Bombardier Dash 8 Q400?

The Dash8 - Q400 - Aeroplane General PDF (courtesy of smartcockpit.com) indicates on page 27 that there are inboard and outboard flaps. Reading through the Dash8 - Q400 Flight Controls PDF (also from ...
FreeMan's user avatar
  • 16.3k
2 votes

Why should autofeather only be used for take off on the Dash-8 Q400?

There is no point to use autofeather when there is no great benefit of that because: Multiplying the phases where you rely on it, is multiplying the risk to forget it armed, and this feature being ...
user40476's user avatar
  • 1,797
1 vote

Why are propellers de-iced before the engines are started, and does ice on the fuselage affect the flight characteristics of the plane?

Ice on airplanes causes two main problems. It adds weight and drag. It changes the shape of the aerodynamic surfaces. Problem 1 is fairly obvious. How serious a problem it is depends on the ...
prl's user avatar
  • 113
1 vote

Are you mandated to use a Fault isolation manual when clearing a defect on an aircraft?

FIM contains procedures for both A/C systems (E.G. EICAS, ECAM, CPDS) messages and pilots/maitenance observations (e.g. smell of burning oil, windshield delamination). All kind of reasonably possible ...
Arkadiusz Iwanowski's user avatar

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