Bell 412

[spinwing]

Mmmmm ....

SandyH

Looks like No.1 Gov a bit 'dodgy' eh? (looks like its not governing) ... what is the N2/Nr doing whilst all this going on?





Having said that could be iced pipe work causing mischief??

[Avnx EO]

Never heard 'em called "super EPs" before... but I like it. There was actually one on display at Heli-expo 2003 in Dallas and they called it the "412 ASAR" (advanced search and rescue). This was a 412EP with PT6T-9 "FADEC" engines (Actually P&WC prefer the term EEC) and a 4-display glass cockpit (an earlier version of the glass cockpit system Bell just certified in the model 429.) There are even pictures of the 412 ASAR posted in this forum if you dig through the "views from the cockpit" thread.

The only 412 ASARs ever made went to the Saudis and Turks as part of a Bell-Agusta cooperative effort (like the BA-609 and the original AB-139) It was supposed to be the start of the "412+" which would eventually have an upgraded rotor and transmission as well, but like so many "promised" 412 improvements since the early 90s.. this too died on the vine.

People have said there was no real interest in the improvements. I don't know... The 'T-9 gives better hot and high and better OEI, but that extra power means slightly greater SFC - so Ur gonna burn a bit more gas day-to-day for the sake of that power margin.... But then there's the benefit of a FADEC engine, less chance of hot starts, better control, glass presentation, automatic power assurance, exceedance recording,etc. I'd ask you...Is it worth it?

Personally, I can't imagine operating without a FADEC (or equivalent) any more.

[Ian Corrigible]

Bell 412 FADEC

There are rumors of a 412+ about every 6 months or so, so I wouldn't be surprised if we do see the T-9 (or something else new from Pratts) reappear.

I/C

[Avnx EO]

No.... the current Canadian CH-146s have the standard, non-FADEC'd PT6-3D somethings. (I think they are -3DF.)

[rainbrave]

Bell 412 FADEC

I compeletly confirm that Turkish Coast Guard (TCG) and Saudi Arabia Air Force (RSAF) operate 412 equipped with EEC controlled -9 engines, fully digital Glass Cockpit (Rogerson Kratos) and 4-Axis Autopilot.

This presents totaly different performanse. We have been operating Agusta production 14 AB 412 EP (EEC Version) in Turkey fully satisfied and I suppose 20 Bell productions in Saudia and 6 are under production in Bell for Bahrain.

I don't know why Bell does not convert 412 EPs to 412 EEC versions... I'm sure it will widely accepted in market will help Bell to compete with AW 139, EC175 and S76++ . Agusta cancelled 412 production line and focused on its own productions..

If any of Bell authorities read this I strongly recommend him to work on Bell 412 FADEC, +, EEC whatever you name it. It's is modern workhorse.

I may help for any technical specification details to anyone who may interest in..

[rainbrave]

"Bell 412 Helicopter" group on facebook

I invite all Bell 412 lovers to "Bell 412 Helicopter" group on facebook.

[HueyDog]

Weather Radar for Bell 412EP

Does anyone have thoughts on what is a good reliable weather radar to install in a new Bell 412EP? I am so sick of Honeywell and their horrible customer service and response that I am willing to consider almost any other option. Honeywell is such a disgrace that I almost wish the Chinese would get their avionics FAA certified so that Honeywell could be buried alongside the dinosaurs.

[caviator]

new to bell 412

hi all, i need some good book to understand the mechanics of bell 412's engine, txmn, etc..

[Saint Jack]

New to Bell 412

caviator: Log onto the Bell Helicopter Textron website and select 'Commercial', then select '412EP', then select 'Data and Brochures' (top right corner) then select 'Bell 412EP Product Specifications, January 2010'. This is a pdf document that will get you started.

[caviator]

thanks

thanks siant jack..but what i needed was something like a maintenance manual which has the working principles of the engine etc,like how does the air bleed system work, blah blah

[212man]

Oh, you mean Px, Py, Pg - governor reset pressure.. etc... good luck!

[caviator]

dunno bout px etc but in 412's manuals, its p2.5, p2.8,and p3 pressures..

[hillberg]

Sandyhelmet Has totque sharing problem?

Check the torque limiting/torque sharing unit,And N1 rigging. good luck

[Rotor George]

https://www.belltrainingacademy.com/...ing.cfm&dir=mx

[RobRW]

Manual

Hey guys, Im after a M/manual or engineering type training notes for the 412, any ideas where I can get hold of something?
Cheers

[GRIFO1978]

AB412 IDRAULIC SYSTEM

Hi!
AB412 has two idraulic sistems:idraulic system number1 and idraulic system numer 2. In the idraulic system number 2 there is the beat dumping. Why in the idraulic system number 1 isn't there?
Thanks!

[Takan Inchovit]

the beat dumping

Do you mean "the accumulator" (dampener) (pulsation damper)?

[GRIFO1978]

Hi!
I don't mean the accumulator (that are present in each idraulic system), but a beat damper. This damper is present only in the idraulic system nr 2 and not in nr 1. This damper is installed in the delivery idraulic line....Why this?

[GRIFO1978]

I'm sorry...Yes, Yes...pulsation damper present only in the idraulic system nr 2...why not in the nr.1 too?

[Takan Inchovit]

Yes...pulsation damper

To reduce the noise from the #2 pump. The #2 pump turns at 6600 RPM whereas the #1 pump turns at 4300RPM when the rotor is at 100%.