Service Information Letter All SILs
| SIL Number | Title | Date (YYYY-MM-DD) | Effectivity |
|---|---|---|---|
| 34-0009 | Setting a Latitude Value in the SDU | 2015-01-12 | All Aircraft |
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Applicability
All Aircraft with SDUs
SIL Summary
Eclipse Aerospace, Inc. (EAI) has received inquiries regarding the correct value for the latitude setting in the Standby Display Unit's (SDU) installed on Eclipse 500 and Eclipse 550® aircraft. EAI is providing this response in regard to those inquiries.
SIL Background
The latitude value has no impact in normal operations. It only affects performance under Directional Gyro (DG) mode. DG mode may be used at high latitudes or in areas of high magnetic distortion. DG mode is also active if the magnetometer is failed. For an SDU operating in DG mode, the pilot can get improved performance in the form of a lower drift rate if the latitude is set for the area of operation. Once the latitude is set, it is stored in the SDU's Non Volitale Memory and will be retained across power cycles.
Eclipse Action
EAI is issuing this SIL to advise customers regarding the setting.
Suggested Operator Action
Operators should be aware of the benefits of selecting accurate latitude information within the SDU. The latitude should be updated any time the aircraft is moved to a new area of operation by more than 20 degrees.
Export Control
These commodities, technology or software, were exported from the United States in accordance with the Export Administration Regulations. These commodities, technology or software are intended for use only in the End User’s country. An export license from the U.S. Department of Commerce may be required before these products can be re-exported, transferred, transshipped on a non-continuous voyage, or otherwise disposed of in any other country, either in their original form or after being incorporated into an end item. Diversion of this end-item or its use contrary to any applicable U.S. government license or to U.S. law is prohibited.