Page 40 - March19

There are changes to software, databases, electronic
activation keys, and manuals with this release that
should be noted. With the introduction of Phase 3,
the Rockwell Collins Pilot’s Operating Guide 523-
0824675; Pro Line Fusion Aircraft Maintenance
Manual 523-0824677; FMS Quick Ref Guide 523-
0823290; Fusion Quick Ref Guide 523-0822518
and Fault Isolation Manual 523-0824683. The
list for production phase 3 aircraft software is
shown [on this referenced Communiqué online].
The field loadable software files are available on
the txtavsupport.com website. The phase 3 AFD
software is bundled into a load set as part number
434-310011-0009 file on the website.
An upgrade path for the serials prior to Phase 3 cut-in
is in work.
ATA 34 – Universal Avionics Flight Management
System Week Number Roll Over
Universal Avionics has issued service bulletin
(SB) 34-3719 to address possible loss of approach
capability affecting legacy Universal Avionics GPS
external sensors, Flight Management Systems (FMS),
Navigation Computer Unit (NCU) with internal GPS
sensor and the GPS Landing System (GLS-1250) GPS
receivers. Some of these systems covered by this SB
were installed in production Pro Line 2 King Airs as
well as through field installations.
For background, GPS Time as defined in the legacy
GPS navigation message, uses 10 bits to count GPS
Week Numbers. This representation can only cover
a finite period of 1024 weeks (19.7- year epoch). GPS
Time is presently in its second Epoch, which will end
on April 6, 2019. The degradation of almanac data
affecting RAIM predictions will begin at 02:00 UTC
on Thursday 4 April 2019. During and after this week
rollover event, Universal Avionics GPS product lines
will be impacted differently, although GPS satellite
tracking and navigation integrity will be unaffected.
To determine if the unit(s) installed in the aircraft
are affected, inspect the nameplate on the FMS, NCU
or GPS sensor and refer to the table to the right for
the effects possible with each system.
If your unit could be affected, please contact a
Universal Avionics repair station or their customer
support group for possible solutions at repairs@uasc.
com or customersupport@uasc.com. A full copy of
the SB can be downloaded from https://secure.uasc.
com/uninet/Default.aspx by registered users.
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­ KING AIR MAGAZINE MARCH 2019