Gulfstream Spring 2006

• Chapter 5 – GIV Inspection Requirement
• Gulfstream Wing Rear Beam Corrosion
• Gyros, Protect Your Investment!

Chapter 5 – GIV Inspection Requirement

— John Kauppila

The FS 793 Aft Bulkhead Cap Angle-NDT Inspection is now a Chapter 5 requirement for the GIV aircraft. This inspection has been a requirement for the GII and GIII aircraft for some time.

The procedure checks the cap angle for cracks around the bolt holes. It usually only takes a few hours to accomplish the inspection. The down side is, if discrepancies are found the task of replacing the cap angle is very labor intensive.

If you have any questions about this, or other inspection issues, please contact me at 269.969.8400 ext. 8477.

Gulfstream Wing Rear Beam Corrosion

— John Kauppila

Duncan Aviation technicians have found fairly severe areas of corrosion, located on the wing rear beam web. The location is forward of the ailerons, on the wing rear beam.

Typically we have found this on the GII and GIII aircraft when the aileron is removed for the 72 month inspection. The corrosion spots are most often found just above the aileron curtain retainers and concentrated around the web stiffener fasteners. This corrosion is difficult to see with the ailerons installed, even with the hinged aileron access panels lowered.

To perform a thorough visual inspection of this area with the ailerons installed, the aileron curtains need to be removed from the wing attach point and the aileron trailing edge positioned down. Another option would be to use a borescope to inspect above the curtains.

This location is shaded as a possible corrosion area in the Aircraft Maintenance Manual Chapter 57,Wing Rear Beam–Inspection. Due to the time interval between this visual inspection and the limited access, we recommend as a good preventative practice to give this area extra attention the next time the ailerons are removed.We suggest a thorough cleaning and inspection, then the application of corrosion inhibiting compound to the rear beam as stated in the AMM.

If you have any questions about this, or other corrosion issues, please contact me at 269.969.8400 ext. 8477.

Gyros, Protect Your Investment!

— Gerry Schultz

You invest a lot of money keeping gyros airworthy. Duncan Aviation does not want to see your money and effort wasted because of improper shipping, handling and procedures. Here are a few things to keep in mind that relate to your gyro.

• Do not tow your aircraft before the gyro is spooled down.
• Do not unplug or plug your gyro in with aircraft power on.
• Unpack your overhauled gyro at the aircraft to avoid rumbling it across the ramp on a cart. (Dropping a gyro from ½” above a hard surface can do significant damage.)
• Packing your gyro for shipment should be equal to or better than the manufacturer’s packing – call Duncan Aviation with questions.
• Do not handle boxes containing gyros like airline luggage. (Just because the shipping box isn’t damaged doesn’t mean the inside of the gyro isn’t damaged.)

Remember that a gyro is like an egg, unless you want it scrambled, handle accordingly! Contact Gerry Schultz at 402.479.4212 for any questions.

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