Northrop Grumman LITEF GmbH SERVICE INFORMATION LETTER

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Northrop Grumman LITEF GmbH
SERVICE INFORMATION LETTER
System:
LCR-100 AHRS
Part Number:
145130-1XXX
145130-2XXX
145130-3XXX
SUBJECT: Update of LCR-100 Attitude and Heading Reference System (AHRS) to
World Magnetic Model 2015
TO:
1
TC/STC Holders, Airframe OEMs, Systems OEMs, Customers,
Operators and Maintenance Personnel of above mentioned AHRS
Reason
This Service Information Letter (SIL) is to inform TC/STC Holders, Airframe and
System OEMs, Customers, Operators and Maintenance Personnel about the
availability of a possible update of LCR-100 Gyrocompassing AHRS (PNs 1451301XXX, 145130-2XXX and 145130-3XXX) with the NOAA World Magnetic Model 2015
(WMM2015).
The WMM is used in the AHRS to determine the magnetic variation at the current
geographical position. The magnetic variation is utilized to calculate the magnetic
heading out of the true heading determined by the Gyrocompassing function on
ground and then further propagated in the system’s navigation mode.
The above mentioned LCR-100 versions utilize by default following NOAA World
Magnetic Models (WMM20XX):
AHRS
145130-1XXX
145130-1XXX
145130-2XXX
145130-2XXX
145130-3XXX
with IDM
124282-0000
124282-2100
124282-0000
124282-2100
124282-2100
Default WMM
WMM2005
WMM2010
WMM2005
WMM2010
WMM2010
Section 7 of this document shows maps indicating the differences of the magnetic
variation between the usage of WMM2005 and the usage of WMM2015 beginning
from 2015 to 2020. The update to WMM2015 might be of interest for operators.
Prerequisite for the Upgrade to the LCR-100 to use WMM2015 are:



LCR-100 production standard MOD 25 or higher.
New Installation Data Module (CALPROM) 124282-2200.
Level One Maintenance Set (L1MS) with SW 1300 or higher.
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Issue A, 2-April 2015
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The WMM update will be performed by connecting a new Installation Data Module
(IDM) PN 124282-2200. This IDM contains the WMM2015 by factory setting.
Programmed IDM User Data (Tray Alignment, MSU Compensation, Lever Arms, etc.)
can be copied into the new IDM by usage of the Level One Maintenance Set (L1MS)
309946-0000, -0100, 0500 or -0501.
NOTE: Make certain when updating the programmed data that the updated IDM is reinstalled in the same position (e.g. installation tray) like the original removed
IDM. The alignment and lever-arm data are specifically matched with the
position of the install tray.
2
Effectivity
The capability to add WMM2015 has been introduced into production on AHRS
145130-1XXX, 145130-2XXX and 145130-3XXX and is identified as MOD 25 or
higher.
3
Availability and Pricing
The IDM PN 124282-2200 with embedded WMM2015 will be available for purchase by
1st October 2015.
On request NG LITEF will provide a commercial proposal for the IDM 124282-2200.
4
Compliance
THIS IS NOT A MANDATORY CHANGE.
Addressees of this SIL must decide if a change to WMM2015 is of interest for their
operation.
Systems in the field returned for service or repair will not be upgraded automatically
and will retain their current configuration/MOD status, unless directed by the
customer.
There is no effect on weight, balance, structural strength, reliability, or other
characteristics affecting the ETSO/TSO airworthiness of the LCR-100. The change is
declared to be a Minor Change.
TC/STC Holders, OEMs, and Operators should assess if changing to the new IDM will
affect the current airworthiness approval of the installed system.
5
Reference Documents
Installation Maintenance Instruction (IMI) 145130-0000-840 Rev. J
6
Warranty
The warranty is not affected.
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7
Differences between NOAA WMM2005/2010 and WMM2015
This section illustrates the maps indicating the differences of the magnetic variation
between the usage of WMM2010 and WMM2015 (Case 1) as well as WMM2005 and
WMM2015 (Cases 2, 2a and 2b) as described in section 1.
Following table shows the affiliation of the LCR-100 AHRS identified by its Mod-status
and the connected IDM and the appropriate map.
Case
Comparison
AHRS Mod
between
WMM2010
1
and
Mod 25
Mod 26
IDM
1242822100
WMM2015
WMM2005
2
and
Mod 25
Mod 26
1242820000
Mod 18
Mod 19
Mod 20
1242820000
Mod 18
Mod 19
Mod 20
1242820000
WMM2015
WMM2005
2a
and
WMM2015
WMM2005
2b
and
WMM2015
SIL-145130-0019-845
Year
2015
2016
2017
2018
2019
2020
2015
2016
2017
2018
2019
2020
2015
2016
2017
2018
2019
2020
2015
2016
2017
2018
2019
2020
MapFigure
1-1
1-2
1-3
1-4
1-5
1-6
2-1
2-2
2-3
2-4
2-5
2-6
3-1
3-2
3-3
3-4
3-5
3-6
4-1
4-2
4-3
4-4
4-5
4-6
Date Input
With FMS
Date Input
or GPS
connected
With FMS
Date Input
or GPS
connected
With FMS
Date Input
Without
FMS Date
Input
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Figure 1-1: Case 1: MagVar Differences [deg] for the Earth in 2015
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Figure 3-1: Case 2a: MagVar Differences [deg] for the Earth in 2015
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Figure 4-1: Case 2b: MagVar Differences [deg] for the Earth in 2015
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8
Service Contact Information
Please address all requests or correspondence with regards to this Service Information
Letter to:
Customer Service
Commercial Avionics
Loerracher Str. 18
79115 FREIBURG
Germany
Phone +49 761 4901 142
Fax
+49 761 4901 773
Email ahrs.support@ng-litef.de
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Northrop Grumman LITEF GmbH SERVICE INFORMATION LETTER

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