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?

:confused:



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

Never heard 'em called "super EPs" before... but I like it:ok:. 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.

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

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

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..:ok:

"Bell 412 Helicopter" group on facebook
 

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

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.

new to bell 412
 

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

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.

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 :)

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

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

Sandyhelmet Has totque sharing problem?
 

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

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

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?:bored:
Thanks!

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

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?

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

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%.

Is reducing the noise the only reason for installing the dampers on idraulic system nr.2?

I believe so.

Bell 412 main transmission dry run capabilities
 

I look for an official document outlining the dry run capabilities for main transmissions of Bell 412s. Information is appreciated. Thanks.


Cheers,


Alouette:ok:

You won't find a document as the 412 was certified before dry run was a requirement. The C box would not last long without oil.

I would say loss of MGB oil pressure = land or ditch immediately.

412 txmsn
 

If not sooner:}

Trog

Thanks, Trogs.:ok:

Right!
Land/ditch immediately!

Anyways no written document you will find about the 412 MGB run dry capability although my maintenance manager told me once he saw a run dry unofficial bench test in Agusta's plant in mid '80; they cranked up the MGB with the rotor installed at operative RPM for a wile, than untied the drain plug letting go all the oil down wile continuing cranking.
The MGB went off after 50 minutes after all the oil have been spilled away.
Consider it was an hangar testing on a inoperative fuselage without any air cooling and moderate blade pitch, he told me.

No infos about CBOX strength without oil inside it.

Cheers

maeroda

412 Oil Loss
 

One last year flew 9 minutes to a safe beach landing. Once the failed line was replaced and oil put in the transmission it returned to base for detailed inspection.

So bottom line at least as good as a S-92.

The Sultan

@ maeroda, the sultan... Thanks for the additional info.:ok:

AB412 PERFORMANCE / CATEGORY RATE
 

Hi!
According of flight manual and your opinion, what performance class and category is rated AB412?
Maybe performance class 2 category A?

It is certificated in Category A and can therefore be operated in Performance Classes 1, 2 and 3.

Jim

Yes cat. A , was perf class 2.
I think last year Bell certified it for perf. class 1.

Wait....and balance!:}

Wich type of B412?
AB412 standards & AB412SP's had a different CAT A certification compared to AB412EP's; the first ones had two kinds of T/O profiles (cat A vertical & cat A normal), slightly different from cat A helipad, elevated helipad and runway T/Offs from EP's manuals.

Anyways AB412EP are certified in CAT A, fulfilling JAR/EASA performance class 1,2 (3 of course).
In some cases it is certified in PC2 with exposure time at MTOW higher than standard PC2.

cheers

tks a loot about these great information
me Mohamed from Egypt mechanical engineer in 412, 2 years experience
i want make acontact with you to learn from your experience.
bye
best guard.

Bell 412EP Flash cards
 

Hi guys, does anyone know where I could purchase, download the above flash cards, mainly interested in the Emergency procedures.

Cheers

BS

Back in the day (1982) we made our own from index cards and the -10. (think operators manual) but then again we made our own skateboards from old skates nailed to a 2x4 also.....damn I am getting old.

AUX TANK
 

I'm trying to track down a right hand aux tank for a Bell412EP (84 GAL)
Part number 205-062-606-226.
If anyone has one lying around in their shed that they don't want please PM me

auto rpm check
 

hey good eve, anybody here who can educate me regarding the procedures on autorpm check? i am just confused on how to use the two charts, density and pressure altitude, how to use the charts, etc? please help me

Set 29.92 inches (1013 mb) on the altimeter, climb 2000 ft AGL, adjust airspeed to 65 knots, lower collective to full down, roll throttles to idle stops, maintain aircraft stable at 65 knots with collective full down, note fuel onboard, record outside air temperature, indicated altitude (pressure altitude) and indicated rotor rpm as you pass through 1000 feet above ground - perform a power recovery and return to base.

On the density chart locate recorded outside air temperature then run a vertical line from there up to the pressure altitude recorded at 1000 ft above ground then run a horizontal line left to read the resulting density altitude.

On the autorotation chart locate the density altitude value on the left side of the chart then run a horizontal line right to the weight the helicopter was at the time the auto rotation rotor rpm was recorded, then run a line straight down to find the required autorotation rotor rpm.

hello everybody!! anybody here who can teach me on how to properly conduct the auto rpm check of bell 412? I mean step by step on how to perform it using the charts in order to get the target RPM. thanks