Avionics News April 2016 - 22
ANALOG OR DIGITAL
Continued from page 20
for aircraft owners.
And going all-electric without going all-glass.
The policy describes "acceptable compliance methods for
replacing vacuum-driven attitude instruments with electronically-driven replacement indicators."
Now that policy existed before. But a problem arose in interpretations by some regions and offices that disallowed the use
of replacement AI electronic displays if the display also showed
information other than simple attitude. Those interpretations
wanted to categorize the AI as an EFIS system with more complications and costs to meet the requirements for going EFIS.
But per the September policy paper, "Electronically-driven
attitude indicators include indicators that use electrical power
to (1) excite an internal gyro, or (2) replace the operation of
the gyro with microelectronics. Electronically-driven attitude
indicators may replace the existing attitude indicators used in
VFR or IFR airplanes."
And if the display shows other data, well, as long as it
provides the function of the attitude indicator, and the pilot left
other instruments alone, have at it.
Other advisory circulars still apply, in the context set by the
new policy paper. Those applicable ACs include:
AC 23.1311-1C, Installation of Electronic Display in Part 23
Airplanes.
AC 23-17C, Systems and Equipment Guide for Certification
of Part 23 Airplanes and Airships.
But the purpose is clear, per the policy statement: "Additionally, the language in the rule allows the replacement of vacuumdriven indicators with electronically-driven attitude indicators
without the need of a standby attitude instrument, and these
electronically-driven attitude indicators are often a form-fit-function replacement for older vacuum-driven attitude indicators that
may be less reliable and more expensive to maintain."
How it works, per the policy statement
For Part 23/CAR 3 aircraft under 6,000 pounds with
vacuum-driven attitude instruments, it is acceptable to replace
vacuum-driven attitude instruments with electronically-driven
attitude indicators under the following conditions:
1. A single function vacuum-driven attitude indicator may
be replaced with a single primary function electronicallydriven attitude indicator. A single function vacuum-driven
attitude indicator may also be replaced with an electronically-driven attitude indicator that provides a secondary
(advisory) function (such as turn and slip indication).
2. The electronically-driven attitude indicator has an
independent standby battery that is capable of meeting
22
avionics news
*
april
2016
the intent of §23.1331 and § 23.1353(h) to independently power the new instrument in the event of a loss
of primary electrical power. It may not be acceptable to
use the start battery as a backup power source for the
electronically-driven attitude indicator unless its state of
charge can be verified at takeoff.
3. The final installation and arrangement must allow for
use of partial panel techniques in the event of a loss of
the electronically-driven attitude indicator source.
4. Compliance must meet all other applicable regulations
(i.e., §§ 23.1381, 23.1331, and 23.1353).
To install an electronically-driven attitude indicator as a
minor alteration, the above conditions and the following additional regulations must be met:
1. The electronically-driven attitude indicator must fit
into the existing location of the vacuum-driven attitude
indicator and be properly set to indicate level flight.
The existing airspeed, altitude, and turn/bank indicators
must remain in their originally certificated or basic "T"
locations. If any additional openings or modifications to
the instrument panel are required to install the electronic instrument, the following requirements must be met:
ii.
iii.
2.
3.
The instrument panel cannot be part
of the aircraft primary structure.
If the instrument panel is part of the aircraft
primary structure, the aircraft manufacturer's
instructions must include instrument panel
modification instructions.
The electronically-driven attitude indicator requires
only minor changes to the existing electrical and
vacuum connections to the aircraft, per Part 43.
The electronically-driven attitude indicator must be
powered from a new, dedicated circuit breaker (or other
appropriate circuit protection device), and it must be
powered by a standby (backup) power source.
One power source, one standby need
With the various options available, the new policy broadens
the range of options available for an aircraft owner to gain the
benefits of modern flight instruments, the elimination of the
reliability plagued air-driven gyro instruments and replacement
of that air pump with a second alternator or other power source
to assure standby electrical power to the instruments in the
event that main-ship electrical power fails.
And the result for the pilot should be a functional panel, still
operating as needed, with no challenges from trying to fly in
IMC with only partial panel available for attitude and directional control. q
Table of Contents for the Digital Edition of Avionics News April 2016
No label
Avionics News April 2016 - Intro
Avionics News April 2016 - Cover1
Avionics News April 2016 - Cover2
Avionics News April 2016 - No label
Avionics News April 2016 - 2
Avionics News April 2016 - 3
Avionics News April 2016 - 4
Avionics News April 2016 - 5
Avionics News April 2016 - 6
Avionics News April 2016 - 7
Avionics News April 2016 - 8
Avionics News April 2016 - 9
Avionics News April 2016 - 10
Avionics News April 2016 - 11
Avionics News April 2016 - 12
Avionics News April 2016 - 13
Avionics News April 2016 - 14
Avionics News April 2016 - 15
Avionics News April 2016 - 16
Avionics News April 2016 - 17
Avionics News April 2016 - 18
Avionics News April 2016 - 19
Avionics News April 2016 - 20
Avionics News April 2016 - 21
Avionics News April 2016 - 22
Avionics News April 2016 - 23
Avionics News April 2016 - 24
Avionics News April 2016 - 25
Avionics News April 2016 - 26
Avionics News April 2016 - 27
Avionics News April 2016 - 28
Avionics News April 2016 - 29
Avionics News April 2016 - 30
Avionics News April 2016 - 31
Avionics News April 2016 - 32
Avionics News April 2016 - 33
Avionics News April 2016 - 34
Avionics News April 2016 - 35
Avionics News April 2016 - 36
Avionics News April 2016 - 37
Avionics News April 2016 - 38
Avionics News April 2016 - 39
Avionics News April 2016 - 40
Avionics News April 2016 - 41
Avionics News April 2016 - 42
Avionics News April 2016 - 43
Avionics News April 2016 - 44
Avionics News April 2016 - 45
Avionics News April 2016 - 46
Avionics News April 2016 - 47
Avionics News April 2016 - 48
Avionics News April 2016 - 49
Avionics News April 2016 - 50
Avionics News April 2016 - 51
Avionics News April 2016 - 52
Avionics News April 2016 - 53
Avionics News April 2016 - 54
Avionics News April 2016 - 55
Avionics News April 2016 - 56
Avionics News April 2016 - 57
Avionics News April 2016 - 58
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Avionics News April 2016 - 60
Avionics News April 2016 - 61
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Avionics News April 2016 - Cover3
Avionics News April 2016 - Cover4
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