Honeywell SIL D201104000037 - Pilatus Aircraft

Honeywell International Inc. 

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SERVICE INFORMATION LETTER 

KGS 200 Mercury2 Wide Area Augmentation System (WAAS) Global Navigation System Sensor Unit 

(GNSSU), PN 066-01201-0102; Incorrect (not as Specified by TSO-C146c) Landing Threshold Point (LTP) 

at Airports at or Above 9,070 Feet Mean Sea Level (MSL) With Localizer Performance With Vertical 

Guidance (LPV) Approaches. At This Time There are no Airports That Meet These Conditions. 

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27 May 2011 

Revision 2, 6 Jul 2011 Page 1 of 9 

Publication Number D201104000037 

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27 May 2011 

Revision 2, 6 Jul 2011 Page 2 




Copyright-Notice 

Copyright 2011 Honeywell International Inc. All rights reserved. 

Honeywell is a registered trademark of Honeywell International Inc. 

All other marks are owned by their respective companies. 

THIS IS THE SB FOSI - DATE: 20101101 

27 May 2011 




Summary 


Transmittal Information 


This revision is a FULL replacement. This revision includes the changes that follow: 

• Changed the acronym LPV to LP in Paragraph 1.E.(3). 

Revision History 

This service information letter (SIL) has had two revision(s) as shown in Table 1. 

Table 1. Revision History 

Revision Number Revision Date 

0 27 May 2011 

1 21 Jun 2011 

2 6 July 2011 

27 May 2011 





1. General Information 

A. Effectivity 

(1) This SIL is applicable to the KGS 200 Mercury2 WAAS GNSSU identified in Table 2. 

Unit PN 

Table 2. Applicable KGS 200 Mercury2 WAAS GNSSU 

KGS 200 Mercury2 WAAS GNSSU 066-01201-0102 All 

B. Reason 

(1) Problem 

Software and Hardware 

Modification Level 

(a) The purpose of this SIL is to inform all KGS 200 Mercury2 WAAS GNSSU 

operators of a software problem that incorrectly identifies the LTP elevation. 

This occurs at airports at or above 2,764.8 meters above the ellipsoid 

(approximately 9,070 feet MSL). This error causes the KGS 200 Mercury2 

WAAS GNSSU at airports at or above 2,764.8 meters above the ellipsoid to 

calculate the glide path 21,501 feet below the correct glideslope. 

(b) Although this problem does not have an effect in the field at this time, it must 

be identified as a TSO non-compliance issue with respect to TSO-C146c. 

(2) Background 

1 The Mercury2 PX Global Navigation System Sensor (GNSS) used 

in the KGS 200 (WAAS) host platform is not in compliance with 

TSO-C146c as specified in Paragraph 2.2.4.3.1 of RTCA/DO-229D, 

which states “For procedures defined by a FAS data block, the 

final approach path shall be defined by the Flight Path Alignment 

Point (FPAP), Landing Threshold Point/Fictitious Threshold Point 

(LTP/FTP), and the Threshold Crossing Height (TCH) and glide 

path angle. The threshold location is referred to as the LTP if it is 

co-located with the runway and FTP if it is displaced from the runway. 

The glide path angle is defined relative to the local tangent plane of 

the WGS-84 ellipsoid. These parameters are defined in Appendix D.” 

(a) During the course of maintenance/updates to the common GNSS software 

code, Honeywell engineering found a software coding error applicable to the 

Mercury2 PX GNSS card. This error causes a defect within the identified host 

product at high elevation airports. The software incorrectly identifies the LTP 

elevation during LPV approach procedures at airfields at or above an elevation 

of 2,764.8 meters above the ellipsoid (approximately 9,070 feet MSL). 

(b) At the time of issuance of this SIL, only 28 high elevation airports worldwide 

are possibly impacted. This was found during an initial root cause 

analysis/investigation by the Honeywell Global Positioning System (GPS) 

engineering team. Refer to Table 3 for a list of the airports. 

27 May 2011 





Table 3. Airports With Elevations at or Above 9,070 Feet (2,765 m) MSL 

Airport City State Country 

FXLT LETSENG LESOTHO 10,400 

(3,170) 

KLXV LEADVILLE CO USA 9,934 

(3,028) 

KTEX TELLURIDE CO USA 9,070 

(2,765) 

SELT LATACUNGA ECUADOR 9,207 

(2,806) 

SEQU QUITO ECUADOR 9,228 

(2,813) 

SETU TULCAN ECUADOR 9,649 

(2,941) 

SKIP IPIALES COLUMBIA 9,740 

(2,969) 

SLCC COPACABANA BOLIVIA 12,595 

(3,839) 

SLCN CHARANA BOLIVIA 13,294 

(4,052) 

SLLJ LAJA BOLIVIA 12,106 

(3,690) 

SLLP LAPAZ BOLIVIA 13,314 

(4,058) 

SLOR ORURO BOLIVIA 12,146 

(3,702) 

SLPO POTOSI BOLIVIA 12,923 

(3,939) 

SLSU SUCRE BOLIVIA 9,527 

(2,904) 

SPHY ANDAHUAYLAS PERU 11,706 

(3,568) 

SPIY YAURI, PERU PERU 12,795 

(3,900) 

SPJJ JAUJA PERU 11,034 

(3,363) 

SPJL JULIACA PERU 12,552 

(3,826) 

Elevation, Feet 

(Meters) 

27 May 2011 





Table 3. Airports With Elevations at or Above 9,070 Feet (2,765 m) MSL (Cont) 

Airport City State Country 

SPOR ORCOPAMPA PERU 12,200 

(3,719) 

SPRF SAN RAFAEL PERU 14,422 

(4,396) 

SPUC HUAMACHUCO PERU 10,367 

(3,160) 

SPVI VICCO PERU 13,461 

(4,103) 

SPVN VILCASHUAMAN PERU 11,965 

(3.647) 

SPZO CUZCO PERU 10,860 

(3,310) 

VNLK LUKLA NEPAL 9,100 

(2,774) 

VNMA MANANG NEPAL 11,001 

(3,353) 

VNST SIMIKOT NEPAL 9,246 

(2,818) 

ZULS LHASA CHINA 11,713 

(3,570) 

Elevation, Feet 

(Meters) 

(c) At this time, none of the airports identified in Table 3 have Satellite Based 

Augmentation System (SBAS) or Ground Based Augmentation System 

(GBAS) approaches. Only KLXV (Leadville, CO USA) and KTEX (Telluride, 

CO USA) are possible locations for SBAS LPV approaches. None of these 

two have approved LPV approaches at this time. 

(d) When Honeywell intentionally removes these LPV capabilities from the 

navigation database, the LPV minima selection on the STAR/Landing Tab will 

not be selectable (that is grayed out). Refer to Figure 1. 

27 May 2011 





C. References 

Figure 1. (Sheet 1 of 1) STAR/Landing Tab 

(e) If an LPV procedure were to be available at a high elevation airfield listed in 

Table 3 and an aircrew were able to load and commence the LPV procedure, 

then this error would cause the KGS 200 Mercury2 WAASGNSSU,atairports 

at or above 2,764.8 meters above the ellipsoid (approximately 9,070 feet MSL), 

to compute the glide path 21,501 feet (6,554 m) below the desired glideslope. 

If the aircraft is in the terminal area with the LPV approach active, the vertical 

deviation scale pointer will be pegged at the bottom of the scale, instructing 

the pilot or autopilot to pitch over to capture the erroneous glideslope which 

could result in a potentially unsafe condition without flight crew intervention. 

(1) To find, see, and download Honeywell Technical Publications, go to 

www.myaerospace.com. 

(2) The documents that follow are related to this SIL: 

27 May 2011 





D. Summary 

E. Action 

• FAA, Technical Standard Order Number TSO-C146c, Stand-Alone Airborne 

Navigation Equipment Using the Global Positioning System Augmented by the 

Satellite Based Augmentation System 

• RTCA Document Number DO-229D, Minimum Operational Performance 

Standards for Global Positioning System/Wide Area Augmentation System 

Airborne Equipment. 

NOTE: The documents identified above are commercially available. Do not send 

an order to Honeywell for these documents as part of this SIL. 

(1) Not applicable. 

(1) Honeywell has identified the root cause of the problem and plans to release a software 

modification in the third quarter of 2011 that will resolve this issue. 

(2) To prevent the possible problem condition, Honeywell will filter the APEX Navigation 

Database to exclude any LPV capabilities at airfields with elevations at or above 9,070 

feet MSL starting with Cycle 1108 with an effective start date of 28 Jul 2011. This 

filtering will remain in effect until such time that the issue is remedied and all affected 

KGS 200 fielded line replaceable units have been updated. 

(3) There are no Localizer Performance (LP) approach types supported by the Apex FMS 

and therefore those approach types cannot be flown using the KGS 200 Mercury2 

WAAS GNSSU. 

27 May 2011

Honeywell SIL D201104000037 - Pilatus Aircraft

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