Avionics -- superflags

[Michalk]

What are the 400mA current sink superflags used for? I've got them on
my Apollo equipment, but they only show hookups to older equipment.

[Michalk]

That's what I would like to know.

[Jerry J. Wass]

Wot's a bloody Superflag???

Michalk wrote:

> What are the 400mA current sink superflags used for? I've got them on
> my Apollo equipment, but they only show hookups to older equipment.

[Gerry Caron]

Some of the old electro-mechanical HSIs and Flight Directors had separate
flag inputs for LOC and GS (for those that had separate LOC and GS
receivers; or at least separate flag outputs), and another "Superflag" input
that controlled both flags simultaneously. Some have just a GS and a
Superflag. In that case, the GS flag input controls just the GS flag and
the Superflag controls both LOC and GS; the Superflag being tied to the LOC.
The theory being that if you lose GS, you can function in LOC-only mode; but
if you lose LOC, GS is meaningless and should be flagged as well.

It's called a superflag because it flags both LOC and GS. You need that
400mA current capability to handle all those solenoids.

Gerry

"Jerry J. Wass" > wrote in message
...
> Wot's a bloody Superflag???
>
> Michalk wrote:
>
> > What are the 400mA current sink superflags used for? I've got them on
> > my Apollo equipment, but they only show hookups to older equipment.
>

[B2431]

>Date: 11/29/2004 22:43 Central Standard Time
>Message-id: >
>
>Some of the old electro-mechanical HSIs and Flight Directors had separate
>flag inputs for LOC and GS (for those that had separate LOC and GS
>receivers; or at least separate flag outputs), and another "Superflag" input
>that controlled both flags simultaneously. Some have just a GS and a
>Superflag. In that case, the GS flag input controls just the GS flag and
>the Superflag controls both LOC and GS; the Superflag being tied to the LOC.
>The theory being that if you lose GS, you can function in LOC-only mode; but
>if you lose LOC, GS is meaningless and should be flagged as well.
>
>It's called a superflag because it flags both LOC and GS. You need that
>400mA current capability to handle all those solenoids.
>
>Gerry
>
>"Jerry J. Wass" > wrote in message
...
>> Wot's a bloody Superflag???
>>
>> Michalk wrote:
>>
>> > What are the 400mA current sink superflags used for? I've got them on
>> > my Apollo equipment, but they only show hookups to older equipment.

What are flag pull and rate of turn voltages? On the rate of turn is the
pointer deflection voltage curve linear?

Dan, U.S. Air Force, retired

[Dean Wilkinson]

"Gerry Caron" > wrote in message >...
> Some of the old electro-mechanical HSIs and Flight Directors had separate
> flag inputs for LOC and GS (for those that had separate LOC and GS
> receivers; or at least separate flag outputs), and another "Superflag" input
> that controlled both flags simultaneously. Some have just a GS and a
> Superflag. In that case, the GS flag input controls just the GS flag and
> the Superflag controls both LOC and GS; the Superflag being tied to the LOC.
> The theory being that if you lose GS, you can function in LOC-only mode; but
> if you lose LOC, GS is meaningless and should be flagged as well.
>
> It's called a superflag because it flags both LOC and GS. You need that
> 400mA current capability to handle all those solenoids.
>

Actually Gerry, its called a superflag because it operates at the bus
voltage (14VDC or 28VDC depending on the airplane). A standard flag
operates at around 0.5VDC and is current driven while a superflag is
driven by a signal at the bus voltage... I designed an avionics box
recently that converted VOR and LOC from analog to digital, and had to
deal with these flags.

Dean