MD80 ARTs SYSTEM ??
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Free from memory, its been two years since I was on the MD80!
Its a garded good old fashioned flick switch.
In short ART can detect an engine failure and will then increase thrust on the operating engine.
To enable system sevaral requirements has to be met:
Aircaraft on ground and idle power
ART switch to auto
Slats extended
The ART system will arm when throttles are moved above about 60 to 65%N1 I forgot the exact number.
To disable flick switch off or retract slats.
Its a garded good old fashioned flick switch.
In short ART can detect an engine failure and will then increase thrust on the operating engine.
To enable system sevaral requirements has to be met:
Aircaraft on ground and idle power
ART switch to auto
Slats extended
The ART system will arm when throttles are moved above about 60 to 65%N1 I forgot the exact number.
To disable flick switch off or retract slats.
Joined: May 2001
Posts: 61
Likes: 0
From: Italy
Just to be more specific: the Automatic Reserve Thrust (ART), combines features of the digital flight guidance and the JT8D-217 engine fuel control unit (FCU).
When the ART system detects a 30.2% differential in N1 rpm-( this is not the only condition that actuates the system)- thrust is increased, whithout throttle movement, by the opening of a solenoid-operated fuel valve in the FCU.
The system is armed at 64% N1.
The toggle switch has Auto/Inop position and is located on the central instrument panel, under a red metal cover.
BD
When the ART system detects a 30.2% differential in N1 rpm-( this is not the only condition that actuates the system)- thrust is increased, whithout throttle movement, by the opening of a solenoid-operated fuel valve in the FCU.
The system is armed at 64% N1.
The toggle switch has Auto/Inop position and is located on the central instrument panel, under a red metal cover.
BD
Joined: May 2001
Posts: 61
Likes: 0
From: Italy
Hi avmech
you wrote:
.
Now this standard procedure is new to me!
What i've understood there's someone using the switching of the DFGC, to obtain max thrust during take-off.
What i know is that you can obtain max thrust, during take off and climb-out, by switching the ART system to INOP and then selecting TO mode on the TRP panel.
This is done normally at the end of the final cockpit checklist ( when you decide which kind of thrust you want: MAX-Normal-Flex).
BD
you wrote:
It can also be actuated by switching DFGC computers. This is a standard procedure for high altitude airport departures with a full load
Now this standard procedure is new to me!
What i've understood there's someone using the switching of the DFGC, to obtain max thrust during take-off.
What i know is that you can obtain max thrust, during take off and climb-out, by switching the ART system to INOP and then selecting TO mode on the TRP panel.
This is done normally at the end of the final cockpit checklist ( when you decide which kind of thrust you want: MAX-Normal-Flex).
BD
Joined: Jun 2001
Posts: 123
Likes: 0
From: Singapore
I'd love to see where this one leads ...any other mac-drivers out there want to comment?
Hmmmm, Tcas climb... 2 years..-219's, you wouldn't happen to be ex-FQ would ya?.............
Just dug the manuals out....the 850lbs increase are for the 217's and variants(217A,217C), and the big guns (219's) you get a 700lbs increase when the ART fires( there's a more technical description available but KISS) for a total of 21,700lbs.
Hmmmm, Tcas climb... 2 years..-219's, you wouldn't happen to be ex-FQ would ya?.............
Just dug the manuals out....the 850lbs increase are for the 217's and variants(217A,217C), and the big guns (219's) you get a 700lbs increase when the ART fires( there's a more technical description available but KISS) for a total of 21,700lbs.
Last edited by xdc9er; 18th January 2003 at 22:41.
