KLN94 GPS and flying "overlay" GPS approaches

John R. Copeland wrote:
"Sam Spade" wrote in message news:Tpwmg.34487$AB3.587@fed1read02...

Kyprianos Biris wrote:


How do you switch it into SUSPEND mode ?

Regards



I can only speak to the Garmin 400/500 series. SUSPEND is built into
the nav database by Garmin for an approach. At a minimum, there is
SUSPEND for the missed approach point. It is cleared by hitting the OBS
button.

Other times SUSPEND occurs:

1. At a course reversal hold, SUSPEND lasts for one circuit in the hold.

2. At a published missed approach hold, SUSPEND lasts indefinately until
cancelled.

3. SUSPEND can occur more than once for a missed approach, such as where
an altitude has to be achieved before a turn can be made (example KJAC
ILS 19)


Kyprianos asked how to switch *into* "suspend" mode, not *out* of it.
I don't have access to a KLN94, so I can't answer his question, either.
But on my CNX80, the "SUSP" button toggles into and out of the "Suspend" mode.

The pilot cannot switch a Garmin 400/500 series into suspend. He can
only invoke OBS mode, which is similar to, but not identical to, suspend.



Furthermore, the CNX80/GNS480 does not automatically "suspend" at the MAP.
If the aircraft doesn't land, the missed approach continues to sequence.


That sounds dicey if you are using autopilot in NAV mode, and there is a
turn required before you might be ready.

"Sam Spade" wrote in message news:wfAmg.34495$AB3.8095@fed1read02...
John R. Copeland wrote:


Furthermore, the CNX80/GNS480 does not automatically "suspend" at the MAP.
If the aircraft doesn't land, the missed approach continues to sequence.


That sounds dicey if you are using autopilot in NAV mode, and there is a
turn required before you might be ready.

Not quite so dicey as it could be, fortunately.
The CNX80/GNS480 will never sequence to any turns until after the initial climb.
It's a mini version of what you mentioned about the KJAC ILS 19 missed approach,
but it's invoked on all GPS missed approaches,
and doesn't require any button-pushing during what can be a busy few moments.
(That assumes flying the charted missed approach, which isn't always the case.)

John R. Copeland wrote:
"Sam Spade" wrote in message news:wfAmg.34495$AB3.8095@fed1read02...

John R. Copeland wrote:



Furthermore, the CNX80/GNS480 does not automatically "suspend" at the MAP.
If the aircraft doesn't land, the missed approach continues to sequence.


That sounds dicey if you are using autopilot in NAV mode, and there is a
turn required before you might be ready.


Not quite so dicey as it could be, fortunately.
The CNX80/GNS480 will never sequence to any turns until after the initial climb.

Not disputing you, but where does this statement come from? Is it in the manual,
or based on experience, or what? I'm a GNS480 user and didn't know this, and I'd
just like to track it down.

It's a mini version of what you mentioned about the KJAC ILS 19 missed approach,
but it's invoked on all GPS missed approaches,
and doesn't require any button-pushing during what can be a busy few moments.
(That assumes flying the charted missed approach, which isn't always the case.)

"Dave Butler" wrote in message news:1151006799.188750@sj-nntpcache-3...
John R. Copeland wrote:

Not quite so dicey as it could be, fortunately.
The CNX80/GNS480 will never sequence to any turns until after the initial climb.

Not disputing you, but where does this statement come from? Is it in the manual,
or based on experience, or what? I'm a GNS480 user and didn't know this, and I'd
just like to track it down.

Experience, actually, but I found a description of it on page 80 of the manual.
Under the topic "Flying the Missed Approach", there's an example.
It describes a VOR/GPS Rwy 4 missed approach at Lynchburg, Virginia...
"1. Follow the missed approach procedures, as published on your approach
plate and for proper climb. The GNS 480 guides you to the holding pattern,
along the 053° radial from LYH VOR. The leg for the 010° heading will
sequence automatically after reaching the appropriate altitude.... snip"

The Windows simulator for the GNS480 seems to work the same way.
If you simulate a (very) low approach, but purposely don't climb,
the simulator won't advance to the next leg.

The Salem people seem proud of their simulator.
They feel it's a pretty accurate implementation of the GNS 480 behavior.
If you've not used the simulator, maybe you'd enjoy trying it out.

John wrote:
The CNX80/GNS480 will never sequence to any turns until after the initial climb.

Dave wrote:
Not disputing you, but where does this statement come from? Is it in the manual,
or based on experience, or what? I'm a GNS480 user and didn't know this, and I'd
just like to track it down.


John wrote:
Experience, actually, but I found a description of it on page 80 of the manual.
Under the topic "Flying the Missed Approach", there's an example.
It describes a VOR/GPS Rwy 4 missed approach at Lynchburg, Virginia...
"1. Follow the missed approach procedures, as published on your approach
plate and for proper climb. The GNS 480 guides you to the holding pattern,
along the 053° radial from LYH VOR. The leg for the 010° heading will
sequence automatically after reaching the appropriate altitude.... snip"

The Windows simulator for the GNS480 seems to work the same way.
If you simulate a (very) low approach, but purposely don't climb,
the simulator won't advance to the next leg.

The Salem people seem proud of their simulator.
They feel it's a pretty accurate implementation of the GNS 480 behavior.
If you've not used the simulator, maybe you'd enjoy trying it out.

Yes, OK, thanks, John. I've used the simulator quite a bit, and my experience
with the simulator and with the airplane reinforces the idea that it will
sequence to the missed approach turn after an initial climb. It was the "never"
in your statement that I was questioning. Sorry I wasn't clear.

Unfortunately the manual reference doesn't address the "never" aspect of your
statement either. Thanks for researching the manual, I should have done that
before posting.

Dave