Avidyne DFC90 Installation Manual download pdf

Avidyne | DFC90, 100 FAQs (Last updated: 26 June 2012)

DFC90 and DFC100 FAQs

Updated 26 June 2012

General Questions

(DFC90, 100) What are the main differences between the DFC90 and DFC100?

There are two functional differences between and the autopilots and two architectural

differences. Functionally, the DFC100 supports the R9 Vectors mode and it adds a

VNAV capability. Architecturally, the DFC90 autopilot takes its input from the Avidyne

or Aspen PFD and the Garmin 430s (or GPS/Nav/Coms connected to the Aspen PFD)

while the DFC100 is driven by the IFD and the Avidyne FMS 400/900w system, and the

DFC100 system communicates to the rest of the R9 system via the Byteflight digital

databus while the DFC90 does not. (updated 17 April 2012)

(DFC90, 100) What are the main features of these autopilots? First and foremost,

since it is taking advantage of the on-board PFD digital ADAHRS, they are able to

provide a much more precise operation (e.g. no overshoots, no wandering, no divergent

behavior inside the FAF, etc). Secondly, they add some very specific safety features such

as Straight and Level and Envelope Protection. Thirdly, they add new modes such as

IAS (Indicated Air Speed) mode. Finally, the Flight Director becomes much easier to use

and follow.

(DFC90, 100) How does IAS mode work? Just like VS mode, IAS mode can be used to

follow a commanded indicated airspeed as set by a new IAS bug or it can be used to

perform an altitude capture at a specified airspeed. Once set via the IAS bug and

engaged, the autopilot will adjust the aircraft flight path angle as required to track the

commanded IAS. The system will not “descend to climb” or “climb to descend”. In

other words, if you were currently flying at 120 KIAS and commanded a 1000’ climb at

140 KIAS, the aircraft will not first descend to pick up airspeed before climbing to the

new altitude target. Likewise, if you were currently flying at 120 KIAS and commanded

a 1000’ descent at 90 KIAS, the aircraft will not first climb to bleed off airspeed before

descending to the new altitude target at 90 KIAS. In both cases, since the autopilot

determines that it cannot comply with the contradictory input requests, it was hold current

state until the pilot takes an action such as a power change or a target speed change.

(DFC90, 100) Why did you retain some of the same user interface as the S-TEC? This

was purposely done to minimize the amount of re-training required for the S-TEC user

community since that represented the vast majority of our early customers. Habit

patterns are a powerful force and we wanted to leave that as intact as feasible. (updated

24 July 2011)

(DFC90, 100) Where can I learn more about the “button-ology” of the DFC

autopilots? These are fully addressed in the autopilot user’s manuals. The link for the

DFC90 Pilot Guide is here and the link for the DFC100 Pilot Guide is here.

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Summary of Contents

Page 1 - DFC90 and DFC100 FAQs

Avidyne | DFC90, 100 FAQs (Last updated: 26 June 2012) 1 DFC90 and DFC100 FAQs Updated 26 June 2012 General Questions (DFC90, 100) What are the mai

Page 2

Avidyne | DFC90, 100 FAQs (Last updated: 26 June 2012) 10 Failure Mode Questions (DFC90) Will the DFC90 work after a loss of air data? Yes, mod

Page 3

Avidyne | DFC90, 100 FAQs (Last updated: 26 June 2012) 11 This is accessible through the Avidyne Live forum at http://avidynelive.com/forum_posts.asp

Page 4

Avidyne | DFC90, 100 FAQs (Last updated: 26 June 2012) 12 (DFC100) Can you explain more about the Underspeed protection that comes with Envelope Prot

Page 5

Avidyne | DFC90, 100 FAQs (Last updated: 26 June 2012) 13 airplane, you are overpowering the spring cartridges and flexing them a lot more than their

Page 6

Avidyne | DFC90, 100 FAQs (Last updated: 26 June 2012) 14 on the flight controls during coupled (AP) operations be avoided. For DFC90 (Release 2 or

Page 7

Avidyne | DFC90, 100 FAQs (Last updated: 26 June 2012) 15 (DFC90) What does a typical DFC90 installation in an Aspen-equipped Cirrus involve? The u

Page 8

Avidyne | DFC90, 100 FAQs (Last updated: 26 June 2012) 16 (DFC90) Will the DFC90 be certified for other aircraft? If so, what and when? Yes, the t

Page 9

Avidyne | DFC90, 100 FAQs (Last updated: 26 June 2012) 17 (DFC90) Will the DFC90 work with Cirrus SRV aircraft (those with S-TEC 55SR)? Yes it will

Page 10 - (Last updated: 26 June 2012)

Avidyne | DFC90, 100 FAQs (Last updated: 26 June 2012) 2 (DFC90, 100) Do I still need to use the AP and FD buttons on the instrument panel? No, tho

Page 11

Avidyne | DFC90, 100 FAQs (Last updated: 26 June 2012) 3 • Added an alert to notify the pilot if the POH bank angle limit has been exceeded. This c

Page 12

Avidyne | DFC90, 100 FAQs (Last updated: 26 June 2012) 4 • Adds support for the Entegra PFD equipped PA46 Matrix and Mirage aircraft; • Changed sys

Page 13

Avidyne | DFC90, 100 FAQs (Last updated: 26 June 2012) 5 (DFC90, 100) Are there any other sources of information where I can learn more about the a

Page 14

Avidyne | DFC90, 100 FAQs (Last updated: 26 June 2012) 6 • Remove all the legacy gear, if not already done so by the Aspen mod (e.g. ADI, HSI, Remot

Page 15

Avidyne | DFC90, 100 FAQs (Last updated: 26 June 2012) 7 the same form factor in an effort to minimize costs and installation difficulties. (updated

Page 16

Avidyne | DFC90, 100 FAQs (Last updated: 26 June 2012) 8 (DFC90, 100) Are there any autopilot calibrations required? No, there are no autopilot cali

Page 17

Avidyne | DFC90, 100 FAQs (Last updated: 26 June 2012) 9 Also, some installers are finding that the rubber gasket in some existing S-Tec 55X trays pr

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