Spring 2009

• Gulfstream Outboard Leading Edge Corrosion
• Clearing the Air on ELTs
• Gulfstream Opportunity Available for May Delivery

Gulfstream Outboard Leading Edge Corrosion

— James Overheul

During several recent Wing Front Beam-Inspections and outboard wing leading edge removals, we have identified several different levels of corrosion. The area of concern is internally located just below the aircraft wing grounding bayonet receptacle. The receptacle is located on the upper aft surface of the outboard leading edge on both the L/H and R/H wing and is open to the external environmental conditions. The corrosion is usually contained to a small area located internally directly below the grounding receptacle. The internal wing leading edge structural members affected are typically the lower “Z” beam, both the horizontal/ vertical surfaces and the lower double skin upper surface.

The cause of this corrosion may be due to inadequate drainage and moisture intrusion. Occasionally, activating the wing anti-ice system during those times when the system might not be activated for long periods will increase the air circulation to help eliminate moisture dwelling in these areas.

If you have any questions about this or any other Gulfstream issue, please contact me at 269.969.8477.

Clearing the Air on ELTs

— Dennis DeCook

The United States does not require the 406MHz Emergency Locator Transmitter (ELT), but as of February 1, 2009, the international monitoring of your 121.5/243 MHz ELT signal ended. The only way to locate a downed aircraft is by using ground-based receivers or an overflying aircraft. Although still legal from the FAA’s perspective, 121.5MHz ELTs will provide extremely limited assistance in the event of a crash.

The installation of a new 406MHz ELT can vary from relatively simple to somewhat complicated, depending on the type of aircraft and the current ELT. The procedure will require replacement of the existing ELT unit and installation of the new 406 MHz antenna. Typical downtimes can range from approximately one day to as many as five days, depending on the ELT antenna requirement. A blade-style antenna is usually required for most Part 25 aircraft. Pricing for installed systems can run from $1,000 to as much as $25,000 depending on your aircraft.

A Nav interface unit is an option that you also may want to consider. This option will transmit the last latitude and longitude from your GPS or FMS and will allow searchers to locate you much quicker. This interface will require additional wiring from the unit to the aircraft’s GPS/FMS system and will add about $4,000 to the installation, plus possible costs to route wires from the front to the back of the aircraft in some cases.

It is expected that the Canadian Aviation Regulations (CAR) will have a new rule requiring 406 MHz ELTs in March of 2009. Concurrently, a new ruling will follow and will be an extension that will give operators flying in Canadian Northern Domestic Airspace an extension of up to two years, but not to exceed the next major inspection or maintenance check. Northern airspace is approximately 60 degree north latitude. Please note, you are required to re-register the beacon every two years. Atmospheric Administration Registration and updating can be done on-line at www.beaconregistration.noaa.gov.

Gulfstream Opportunity Available for May Delivery

One Owner HUD-equipped GIVSP s/n 1318 on Corporate Care at Duncan Aviation for complete interior/paint. Available in May, contact Aircraft Sales and Acquisitions for details 402.475.2611.

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