Hawker Spring 2002

• Cabin Window Inspection
• SB 32-3135 Improved Main Gear Torque Link Bushing
• Check Your Windshield Heating Elements
• A New Inspection
• 2070C01 Fuel Boost Pumps

Cabin Window Inspection

— Dick Hyde

Raytheon has issued Communiqué 56-18 that has new criteria for the inspection of cabin windows. On some cabin windows a white line is starting to appear where the reinforcing ring is bonded to the outer panel. As this white line grows, the chance of having cracks or crazing in this area increase. If the width of the white line in any location on the window is 0.125” or greater, this automatically rejects the window. This information should be added to the SRM at the next revision.

SB 32-3135 Improved Main Gear Torque Link Bushing

— Roy Olsen

SB 32-3135 removes the old bronze bushing from the scissors on the main gears and installs a steel bushing with steel spacers. It is a recommended SB for the 800, 800XP and 1000 series aircraft whenever the gear is overhauled or when the old, bronze bushings need to be replaced.

Once completed, operators still need to check for play. If you have play you can remove the old spacers and install new spacers, as they come in different thicknesses. Check the gap and install a matching pair of spacers between the bushes on both sides of the torque link. You must do the same to both the top and bottom torque link.

Check Your Windshield Heating Elements

— Roy Olsen

On 800, 800XP and 1000 series aircraft operators can check the heating elements in the windshields without taking the windshields out. Each windshield has three solid-state relays that supply AC power to heat the windshield; they are located in the DA panel.

Using the right windshield heat system on the 800 series as an example: The relays are C/D/E. If you check the resistance between terminal four on relay C and relay D, it should be 30 ohms. This checks out one heating element on the windshield. Then check resistance between terminal four on relay D and relay E, it should be 30 ohms. This checks out the second heating element. Next check the resistance between terminal four on relays E and C, this should also be 30 ohms. If you have 30 ohms on each of the checks, the heating elements for the windshield are good.

For more info about checking the heating elements on the various models mentioned, contact Roy Olsen in BTL or Dick Hyde in LNK.

A New Inspection

— Roy Olsen

A new inspection has been included in the functional test in the B1 inspection for the 700-800 series which requires checking the candlepower of the strobe lights. According to the inspection criteria, the test calls for checking the output of the lights. If they are 400 or better, the lights are good. This information is incorrect. The criteria should be for 100 or better and Raytheon will correct this on their next revision of the Maintenance Schedule.

Raytheon is also considering putting an ultimate life of 1,200 hours on the lights, as they have no history on the failure rate of the bulbs. This may change since the manufacturer says they should last 1,500 hours.

2070C01 Fuel Boost Pumps

— Karl Detweiler

Technicians at Duncan Aviation have recently discovered that the fields in the motor portion of these pumps often have “spliced wires.” The manufacturer is Intertechnique, and they strictly forbid these wires to be spliced.

If you are operating an aircraft with 2070C01 Intertechnique fuel boost pumps, Duncan Aviation recommends that you ask your repair facility to verify that there are no spliced wires on the fields of your pumps during your next maintenance event.

If you have any questions about this issue, contact Chris Gress at Duncan Aviation Component Sales at 800.228.4277 ext. 1664, fax at 402.479.4151.

( Return to top )