Why B737 only CAT IIIA?
Because the 737 (or at least most of them) only have two Autopilots and are therefore certified for dual-chanel, fail passive operations (EG Cat IIIA) whilst the 'Bus has three and are certified for Tripple Chanel fail-safe operations (EG CatIIIB).
I believe a third AP and CatIIIB capability is an option on current-build 737s.
I believe a third AP and CatIIIB capability is an option on current-build 737s.
Sorry Wiz , the A320 family has only two Autopilots .
The Cat 3 status is to do with as you say the ability of those devices toconduct fail operational approaches .
Maybe someone here will provide all the technical stuff.
NF
The Cat 3 status is to do with as you say the ability of those devices toconduct fail operational approaches .
Maybe someone here will provide all the technical stuff.
NF
From Feb 2003 the 737NG was offered with the fail operational (Cat IIIB) Collins enhanced DFCS. This has an optional rudder servo to give rudder controlled rollout and engine-out capability, although the EO facility is not autoland approved. Note the 737 still only has two autopilots, it is the rudder channel that makes the difference.
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All of our B737-NG's operated to CAT3-a (no hud) and no rollout guidence.
Note the 737 still only has two autopilots, it is the rudder channel that makes the difference.
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Even the 1-11 had an autopilot rudder channel and managed cat3a (sometimes!)
FLCH-SPD,
737 Classic autoland x-w limit is 15kts & 737NG limit is 20kts (or 25kts with rudder channel). The aircraft simply autolands with the crab left on – just like in that crosswind video with the Portuguese subtitles that is doing the rounds! Once it has touched down the momentum seems to send the aircraft forward rather than in the direction of the gear, directional control is not a problem.
Gullyone,
The 737 gear does not pivot, although there is a bit of “play” in the links but not enough to increase any crosswind limit.
ASFKAP
I have never heard of dual-dual, I still have a lot to learn about this aircraft!
S&L
737 Classic autoland x-w limit is 15kts & 737NG limit is 20kts (or 25kts with rudder channel). The aircraft simply autolands with the crab left on – just like in that crosswind video with the Portuguese subtitles that is doing the rounds! Once it has touched down the momentum seems to send the aircraft forward rather than in the direction of the gear, directional control is not a problem.
Gullyone,
The 737 gear does not pivot, although there is a bit of “play” in the links but not enough to increase any crosswind limit.
ASFKAP
I have never heard of dual-dual, I still have a lot to learn about this aircraft!
S&L
Thanks for the info, it might take me a while to digest all that.
BTW I thought avionics engineers were known as "fairies" - nothing to do with their private lives, I think the term came from the lights on Christmas Trees.
Similarly:
Electricians = Sparkies
Engines = Stokers
Airframes = Riggers
Cabin = Cushion stuffers
I am sure there are more.
BTW I thought avionics engineers were known as "fairies" - nothing to do with their private lives, I think the term came from the lights on Christmas Trees.
Similarly:
Electricians = Sparkies
Engines = Stokers
Airframes = Riggers
Cabin = Cushion stuffers
I am sure there are more.
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pilots sequence of operations and sequence of aircraft systems from start to end
hi,
can any one throw some light on what are the sequence of operations a pilot does from start of the flight to end .. and what are the various systems that operate from start to end? for example what the does the pilot do to start the engine from where does the power come to start the engine?
looking forward for some help
can any one throw some light on what are the sequence of operations a pilot does from start of the flight to end .. and what are the various systems that operate from start to end? for example what the does the pilot do to start the engine from where does the power come to start the engine?
looking forward for some help
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Sureshav
Don't be offended, but in this day and age of heightened security you have no chance of having that question answered.
In fact, some nasty men with guns and big dogs might be round your place PDQ asking you questions!!
Don't be offended, but in this day and age of heightened security you have no chance of having that question answered.
In fact, some nasty men with guns and big dogs might be round your place PDQ asking you questions!!
Bear Behind
...but the bus does have lower minima for DH and RVR than the NG, though, doesn't it? Meaning that the bus is 'more' IIIB than the NG (if you catch my drift). I know what the minima are for the bus but what are they for the NG?