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Search: Posts Made By: TURIN
Showing results 1 to 34 of 34
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Forum: Tech Log
8th Apr 2013, 10:34
Replies: 1,100
Views: 263,501
Posted By TURIN

Kenneth. No there aren't. The Common Motor...

Kenneth.
No there aren't.

The Common Motor Starter Controllers (CMSC) alter the frequency of the +/-270VDC as required to control the speed & torque of the various big motors such as engine...
Forum: Tech Log
5th Apr 2013, 21:26
Replies: 1,100
Views: 263,501
Posted By TURIN

Hot battery bus. As has been said, is connected...

Hot battery bus. As has been said, is connected directly to the battery. It is not a tie bus. The battery bus is connected to the HBB by a contactor.

The a/c is fitted with a Common Return...
Forum: Tech Log
20th Mar 2013, 10:42
Replies: 1,100
Views: 263,501
Posted By TURIN

Spot on Sir. :ok:

Spot on Sir. :ok:
Forum: Tech Log
19th Mar 2013, 09:48
Replies: 1,100
Views: 263,501
Posted By TURIN

Capetonian I've seen that 'email' pop up a...

Capetonian

I've seen that 'email' pop up a few times across various internet boards now.
I suspect it's a hoax with a few grains of truth attached.

We'll see.
Forum: Tech Log
13th Mar 2013, 19:32
Replies: 1,100
Views: 263,501
Posted By TURIN

No, but I do know that ALL Li-Ion batteries were...

No, but I do know that ALL Li-Ion batteries were disconnected by at least one airline when they were grounded in January. Which included the ACE battery modules.



Except of course the...
Forum: Tech Log
12th Mar 2013, 21:14
Replies: 1,100
Views: 263,501
Posted By TURIN

•Hull and eebay is at cabin altitude ~6000 feet ...

•Hull and eebay is at cabin altitude ~6000 feet


Fixed it for ya. :ok:



The APU battery has a single purpose, mainly. It is not integrated into the system. It starts the APU (occasionally)...
Forum: Tech Log
11th Mar 2013, 19:35
Replies: 1,100
Views: 263,501
Posted By TURIN

Good point. The ACE (Actuator Control...

Good point.

The ACE (Actuator Control Electronics) backup Batteries are also Li-Ion. Much smaller than a main battery and only designed to last about ten minutes. As far as I know there have been...
Forum: Tech Log
11th Mar 2013, 19:12
Replies: 1,100
Views: 263,501
Posted By TURIN

That's all very well Lyman, and I do not doubt...

That's all very well Lyman, and I do not doubt your experience in this field.

However,
The original single battery (constructed of three cells if you will) appears to perform well ON IT'S OWN, ...
Forum: Tech Log
11th Mar 2013, 17:04
Replies: 1,100
Views: 263,501
Posted By TURIN

Lyman. I take your point about stresses at...

Lyman.

I take your point about stresses at the folds and the quality control required to construct a device that works as advertised.
However, as single units these batteries (cells) appear to...
Forum: Tech Log
9th Mar 2013, 12:13
Replies: 1,100
Views: 263,501
Posted By TURIN

Usually the APUC stays powered for approx 2 mins...

Usually the APUC stays powered for approx 2 mins after the APU shuts down. I think the 737-3/5/500 had problems with this early on as pilots/engs were shutting the battery off as soon as the APU...
Forum: Tech Log
8th Mar 2013, 21:42
Replies: 1,100
Views: 263,501
Posted By TURIN

Erm, how so? The Main battery and APU...

Erm, how so?

The Main battery and APU battery circuits are (supposed) to be completely independent.
Forum: Tech Log
8th Mar 2013, 09:23
Replies: 1,100
Views: 263,501
Posted By TURIN

And... My understanding of the APU...

And...




My understanding of the APU start system is that one Starter/Gen is powered from the main electrical busses and one from the APU battery bus.

It is an either/or scenario. Not...
Forum: Tech Log
22nd Feb 2013, 15:55
Replies: 1,100
Views: 263,501
Posted By TURIN

One would assume that the main busses were still...

One would assume that the main busses were still powered, therefore APU would be started from power available and not the APU bat. :ok:



Didn't we cover this already? MEL allows dispatch with...
Forum: Tech Log
19th Feb 2013, 11:57
Replies: 1,100
Views: 263,501
Posted By TURIN

Eh?:confused: The main bat has nothing to do...

Eh?:confused:

The main bat has nothing to do with engine start.

A ni-cad will do the job of starting the APU.

Someone at Boeing got their wires crossed. :suspect:
Forum: Tech Log
8th Feb 2013, 21:58
Replies: 1,100
Views: 263,501
Posted By TURIN

Cockney Steve, No, the APU and Main...

Cockney Steve,




No, the APU and Main batteries perform completely different and seperate functions. You cannot use power from the Main Battery to start the APU anymore than you can use the...
Forum: Tech Log
7th Feb 2013, 11:55
Replies: 1,100
Views: 263,501
Posted By TURIN

No info on that sorry. In normal ops the...

No info on that sorry.

In normal ops the APU would have been started on taxi-in off the normal AC supply. However, in my experience it is not uncommon for the ground electrical supply to drop off...
Forum: Tech Log
7th Feb 2013, 11:48
Replies: 1,100
Views: 263,501
Posted By TURIN

I think this was covered in either this or one of...

I think this was covered in either this or one of the other (five?) threads.

In an emergency you don't want your battery to shut down just to save itself from the scrap heap.

Imagine this...
Forum: Tech Log
6th Feb 2013, 22:48
Replies: 1,100
Views: 263,501
Posted By TURIN

Bill, the battery does not start the engines. ...

Bill, the battery does not start the engines.
The APU battery can be used to start the APU if no other AC available.
Main engine start is from high energy AC sources only.
Forum: Tech Log
6th Feb 2013, 16:09
Replies: 1,100
Views: 263,501
Posted By TURIN

Indeed. Lyman. That is not explosive damage,...

Indeed.
Lyman. That is not explosive damage, it is a tear. Fire fighters are tough and carry axes.
Forum: Tech Log
6th Feb 2013, 08:56
Replies: 1,100
Views: 263,501
Posted By TURIN

Regarding low temp limit of -18c. Both...

Regarding low temp limit of -18c.

Both batteries are situated in pressurised/air conditioned areas.
The only time these batteries should be subject to extreme cold is if the aircraft is parked...
Forum: Tech Log
5th Feb 2013, 21:46
Replies: 1,100
Views: 263,501
Posted By TURIN

No, but it's certainly a thought.

No, but it's certainly a thought.
Forum: Tech Log
5th Feb 2013, 12:44
Replies: 1,100
Views: 263,501
Posted By TURIN

Leaving them switched on and ground power...

Leaving them switched on and ground power dropping off line.
Towing on Battery only for too long.
Fuelling on battery only for too long.
APU switch left in 'On' position (to vent APU core)

In...
Forum: Tech Log
5th Feb 2013, 09:07
Replies: 1,100
Views: 263,501
Posted By TURIN

Do we know for certain that it is the charger...

Do we know for certain that it is the charger that is causing the problem?
Forum: Tech Log
4th Feb 2013, 19:37
Replies: 1,100
Views: 263,501
Posted By TURIN

APU BAT. Circuit Breakers between FO's...

APU BAT.
Circuit Breakers between FO's Instrument Bus & Bat Charger and between Bat Charger & APU Hot Bat Bus/Battery.

MAIN BAT.
Circuit Breakers between Captain's Instrument Bus & Bat Charger...
Forum: Tech Log
3rd Feb 2013, 18:44
Replies: 1,100
Views: 263,501
Posted By TURIN

Eh?

I class myself as a simple individual working in a complex industry.

However, this thread and the one running in R & N seems to have been hijacked by philosophers typing in riddles.

No...
Forum: Tech Log
3rd Feb 2013, 12:19
Replies: 1,100
Views: 263,501
Posted By TURIN

Who said it was critical? I can't find a...

Who said it was critical? I can't find a reference for that.

AFAIK The recharging requirement for the 787 battery is no different to any other.

Except perhaps for emergency brakes in the...
Forum: Tech Log
2nd Feb 2013, 11:37
Replies: 1,100
Views: 263,501
Posted By TURIN

Correct. As I said, this quick fix is to ensure...

Correct. As I said, this quick fix is to ensure continued operations of the APU, albeit with awkward ramifications for the operator.
All a/c have these type of issues throughout their service life....
Forum: Tech Log
1st Feb 2013, 08:20
Replies: 1,100
Views: 263,501
Posted By TURIN

A FEW POINTS FOR CLARIFICATION.

From memory, no schematic available at the moment.

APU BAT
FO's Instrument Bus-CB-Bat Charger-Batttery-APU Hot Bat Bus-SPUC-SPU-ATRU-CMSC-APU VSMG.


MAIN BAT
CAPT's Instrument Bus-CB-Bat...
Forum: Tech Log
31st Jan 2013, 09:43
Replies: 1,100
Views: 263,501
Posted By TURIN

Saptzae. Re: Motoring the apu after shutdown. ...

Saptzae.
Re: Motoring the apu after shutdown.
Unfortunately, the APU starter motor controllers are liquid cooled and would need the PECS (Power Equipment Cooling System) to function after shutdown....
Forum: Tech Log
31st Jan 2013, 04:58
Replies: 1,100
Views: 263,501
Posted By TURIN

Chris Scott. Temp/Time limits on the APU are...

Chris Scott.
Temp/Time limits on the APU are due to a rotor bow problem caused by excess heat soak after shutdown.. The quick fix is to leave the APU inlet door open to allow sufficient ventilation...
Forum: Tech Log
28th Jan 2013, 20:20
Replies: 1,100
Views: 263,501
Posted By TURIN

RR_NDB. The diode module is not "the switch...

RR_NDB.
The diode module is not "the switch that puts the bat on the bus" as you say. The diode module is between the bat and the hot bat bus. The hot bat bus is only connected to a main DC Bus when...
Forum: Tech Log
27th Jan 2013, 13:16
Replies: 1,100
Views: 263,501
Posted By TURIN

Saptzae. The APU AC BUS can be tied to the L...

Saptzae.
The APU AC BUS can be tied to the L and R AC busses.
From what I can see the only connection from the APU Battery is through the Start Power Unit (SPU) this converts 28vDC to 115vAC this...
Forum: Tech Log
27th Jan 2013, 02:45
Replies: 1,100
Views: 263,501
Posted By TURIN

Main bat is connected to the hot bat bus through...

Main bat is connected to the hot bat bus through a diode module to ensure the bat only gets charged through its charger. APU bat has no such protection as it is only connected to the APU start...
Forum: Tech Log
20th Jan 2013, 21:49
Replies: 1,100
Views: 263,501
Posted By TURIN

My information is that the batteries are Lithium...

My information is that the batteries are Lithium Manganese. (From Boeing Training Notes). :confused:
Showing results 1 to 34 of 34


 
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