differences between the 747 classic and 400?
 

hi there

I know some of the differences between the 400 and 200 are,
winglets,
ehanced GPWS,
CRTS
PVD etc,
2 man crew


what i also wanted to know is the TCAS, EICAS, unique to the 400 compared to the 200.

I saw a picture of the 200 flight deck and the 400 and obviously the dials on the 200 are analogue but essentially are they the same? i assume they must be, but its just the format thats different.

are there any other major differences?

once again

cheers

PH

If ya do a search you find some previous topics that will cover this. But in any case just a few details:
Flight Deck - EICAS system with all the mods of TCAS, GPWS (the upgraded software for EGPWS is still being fitted to many) with associated FMC/GPS nav etc which gives a different autoflight system from earlier 747. CRT for PFD/ND. Around 600 fewer switches/lights. Instillation of CMC for quick trouble shooting.

Airframe - winglets, wings have etxra 6' extension, extra leading edge flap, recontoured wing fillet, tail fuel tank (HST), increased rudder deflection by 6 degrees (reduces Vmcg etc), carbon brakes , lower profile tyres on larger diameter rims, different alloys in wing to reduce weight by 6,000 lbs, upperdeck strengthened to give a 20' sq hole blowout survival instead of 12.5'sq.

Cabin - vacuum dunnies, redesigned overhead bins and side panels, maybe composite floorboards (but can not remember) exactly.

Power - different engines. Uprated and new APU. With more fuel and more efficent engines = greater range. Composite cowlings.

Uprated takeoff weights

All I can remeber off the top of my head. Guess you have an interview or something?????

As to your question - my understanding is that the EICAS and CRT is only on the 400 and not the earlier models (unless retrofitted). Most aircraft these days have a form of TCAS fitted, even the earlier 200s that I have seen usually have it fitted. The instruments look different - but they give you the same stuff - how to fly.

[This message has been edited by concrete_slurry (edited 02 July 2001).]

Hi there, just surfing the forum and thought that I might help here.
EICAS- Engine indicating and Crew aleart System, is only available to the 400. It use is for the monitoring of all engine and airframe systems and informing either ground crew or flight crew to the current status of the aircrafts systems.

As for the rest that is has been mentioned it is all spot on. There are other differences with certain systems but you could be here all day typing.

I hope it has helped.

Cheers

thanx for the replys,

the simple reason for asking was that i just read a book called fying th big jets by s stewart and i had a couple of qs that needed to be cleared up.

cheers

Very good concrete!

There is also the extra fuel tank in the horizontal stab of the -400's too...

6Demon, except on the -400F.

------------------
rgds Rat

And you can have stab tank on a 747-300.
From a Maintenance Engineering perspective a differences course between the 747 classic and the 747-400 is approx 8 weeks training. There are many many differences, and it would take a long long time to even attempt to go through them.
For instance the elevators on the classic are cross connected LH outer to RH inner but on the 400 they are connected LH outer to LH inner.

"I know some of the differences between the 400 and 200 are,


winglets,
ehanced GPWS,"


Unfortunately, it's not that simple, PH.

For example, Japan Airlines have domestic versions of the 747-400 without winglets... and Qantas, is retrofitting EGPWS on their "Classic" 747's.

As already mentioned, there are just too many differences to list. Different autopilot, fuel system, navigation systems, pneumatics, hydraulics, engine control, flight controls, etc. The 400 has much more automation, and, as a rule, is much easier to fly and fix.

Rgds.
Q.