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15 votes
Accepted

Why was pitch angle protection not active in the CRJ 200 during the crash of Sweden Air 294?

I am intimately familiar with that incident. The airplane only had FDR recording the left PFD so they don't really know what was showing on the right one based on FDR. The only pitch angle ...
John K's user avatar
  • 132k
13 votes

Why does the Canadair Regional Jet still use CRT screens?

I know the exact answer, even if 2 years late. Firstly, Collins makes their own displays. Secondly, it was a conscious decision during CRJ700 development to remain CRT, solely for the reason that ...
Joseph W Patton's user avatar
12 votes

What does the red background of some toggle switches in CRJ 700/900 overhead panel mean?

There isn't actually any particular meaning to those colours. Those switches have a rubber boot at the base to seal out moisture and outside dust, etc, and the rubber happens to be red because that's ...
John K's user avatar
  • 132k
11 votes

Why does the Canadair Regional Jet still use CRT screens?

This is just an educated guess, but it was too much info for comments. Maybe someone can come up with a specific answer, but it seems it's probably a certification delay. The CRJ's all use the ...
TomMcW's user avatar
  • 28.6k
10 votes

What is that hole on the front portion of the empennage of a CRJ-1000?

It is the Ram Air Inlet Duct for the cabin air system. It normally acts as cooling air for the packs but can also be used as an alternate vent source in an emergency. The cooling efficiency of ...
Dave's user avatar
  • 101k
10 votes
Accepted

What's with this non-exit Exit sign on Delta CRJs?

Normally there is some kind of barrier, a bulkhead or curtain, separating the business class and the common folk in steerage. In such a case the sign is to indicate that there is an exit somewhere ...
John K's user avatar
  • 132k
9 votes
Accepted

What does the sound and flashing button indicate during this landing?

It's the "Master Caution" indication. The sound also belongs to this. It tells you that something is not working by the books and that you should check it out immediately. There was probably ...
Patric Hartmann's user avatar
5 votes
Accepted

Do all Bombardier jets have manual reversion?

Can't speak for the Lear, which I believe has manual controls anyway, but the CRJs DO NOT have manual reversion. The RJs are designed to a technical level similar to the Boeing 767. The control ...
John K's user avatar
  • 132k
5 votes
Accepted

Why couldn't the CRJ100/200 be equipped with triple-string autoland?

I have experience on that program and can tell you that: A: While anything is possible, this would cost a fortune to implement, requiring a complete avionics overhaul. For a single potential ...
John K's user avatar
  • 132k
5 votes
Accepted

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 the meaning of Minimum Flight Weight?

After little digging found EASA Part 25/FAR 25.25 (same text): CS 25.25 Weight Limits (b) Minimum weight. The minimum weight (the lowest weight at which compliance with each applicable requirement of ...
busdriver's user avatar
  • 3,340
3 votes

Were my airplane's wheels under-inflated?

High tire pressure means less rolling resistance at least on a good road. However it also reduces grip that makes braking less efficient (source). Hence high pressure may make sense for a bicycle but ...
h22's user avatar
  • 12.1k
3 votes

Logo light source placement on CRJ 900

The Bombardier CRJ series has the logo lights installed on the engine pylons: E. Logo Lighting A white logo light is installed on the upper surface of each engine pylon to illuminate the airline logo ...
Bianfable's user avatar
  • 55.9k
3 votes

Can autopilot track ILS without any internal heading reference?

I'll give an answer with the caveat that I haven't used the system in over 10 years. So maybe do some additional research. The Collins Proline Flight Director used on the 200 (it's not the Autopilot ...
John K's user avatar
  • 132k
3 votes

Why does the CRJ100/200’s FMS miscalculate temperatures at altitudes in excess of 36k feet?

The reason is that the tropopause is at 11 km (36 089 ft) in the International Standard Atmosphere. At the tropopause, the temperature lapse rate of the atmosphere (how temperature changes with ...
Bianfable's user avatar
  • 55.9k
3 votes
Accepted

Why do small jets usually have one low flap setting?

The provision of lots of flaps settings is motivated in part by the desire to provide as many profile optimizations as possible. Generally, the less the flap extension for takeoff, the more efficiency ...
John K's user avatar
  • 132k
3 votes

What is the fuel burn of the APU on the CRJ900?

It's surprisingly hard to come with that sort of data. It's hard to come up with a fuel burn number because the fuel burn varies widely, because the loads vary widely, between electrical loads and ...
John K's user avatar
  • 132k
2 votes
Accepted

Can autopilot track ILS without any internal heading reference?

Most autopilots in small aircraft blindly track the ILS (same for VORs) without any heading reference, which is actually simpler because heading can be substantially different from ground track, ...
Rainer P.'s user avatar
  • 2,920
2 votes

What is the meaning of Minimum Flight Weight?

For purposes of determining minimum design weight: it is the empty weight + installed equipment + crew + full oil + MINIMUM (not “undrainable” or “unusable” fuel). Minimum fuel for these ...
Carlos Diaz's user avatar
2 votes

What is the meaning of Minimum Flight Weight?

This is the weight in an operational condition(with engine oil, hydraulic fluid, unusable fuel in the tanks[maybe also with a specific usable amount like 30 minutes], and some other misc items), with ...
Max Power's user avatar
  • 2,604
2 votes

What is the reason for this engine oil service procedure on a Bombardier CRJ?

When the engine is running, it sucks up the oil from the reservoir and puts it in all the galleries, ie the oil's all in the right places to lubricate the engine. When you shut the engine down, the ...
RAC's user avatar
  • 4,616
2 votes

What is the reason for this engine oil service procedure on a Bombardier CRJ?

The Aircraft Flight Manual or Flight Crew Operating Manual will specify the timeframe during which engine oil may be checked after engine shutdown. For the CF34-3B engine on a Challenger 605, checking ...
Ugo's user avatar
  • 746
1 vote

What is the reason for this engine oil service procedure on a Bombardier CRJ?

I don't know the specifics for that plane, but in general you do oil changes with the oil warm so that it is less viscous, so there's a minimum amount of dirty, old oil left inside the engine (and so ...
Robin Bennett's user avatar
1 vote

What's the cabin pressure of a Bombardier CRJ-900?

At max differential it's 8000 ft. The controller operates on an automatic program schedule that lets the cabin pre-pressurize to about 300 ft below field elevation at the start of the takeoff to ...
John K's user avatar
  • 132k
1 vote

Were my airplane's wheels under-inflated?

Neither car nor aircraft tires are supposed to be inflated to the point where only a small percentage of the tire is in contact with the ground. If you can think of a scientific argument why they ...
Juan Jimenez's user avatar

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