Lycoming Service Bulletin No. 584A
3 Jun 08 - Lycoming Service Bulletin No. 584. Reprint of Unison Service Bulletin No. SB3-08.
Models Affected: All lycoming new, overhauled, rebuilt, or repaired engines with:
Ladies and Gentlemen we have received new guidance from senior leadership concerning compliance with Slick Service Bulletins SB2-08 and SB3-08.
Effective immediately the following parts will be replaced at the next 500 hour magneto inspection for all Slick magnetos.
- Carbon Brush - Tempest part number AM3215
- Wear Cam - Tempest part number AM3611
These Tempest parts are available for a nominal cost from Aero Aviation, 1-800-831-5454
This action eliminates the inspection requirements of Slick SB2-08 and SB3-08.
1. SB2-08 affects Slick 4300/6300 magnetos in serial number range 0610xxxx through 0804xxxx. All magnetos that have had a cam, or the cam as part of the contact point assembly kit replaced, and all magnetos models in the above serial number range must be inspected as per SB2-08 for premature wear of the breaker point cam at the next scheduled oil change and thereafter at each 100 hour/annual which ever occurs first. Follow the instructions in the service bulletin if premature wear of the breaker point cam is found.
2. SB3-08 affects Slick 4300/6300 magnetos in serial number range 0409xxxx and up and magnetos that have had a carbon brush or distributor block replaced since September 1, 2004.
Magnetos with serial numbers 0409xxxx through 0611xxxx and all magnetos which have had a carbon brush or distributor block replaced between September 1, 2004 and November 30, 2006 comply with below steps 2 and 3 only.
Magnetos with serial numbers 0612xxxx and up and all magnetos which have had a carbon brush or distributor block replaced on or after December 1, 2006 comply with below steps 1 through 3.
STEP 1. Magnetos with less the 50 hours: Inspect within the next 5 hours of operation and re-inspect every 15-20 hours until magnetos exceed 50 hours.
STEP 2. Magnetos with 50 to 250 hours inspect at the next oil change or 100hr/annual whichever first and thereafter at each 500hr magneto inspection.
STEP 3. Magnetos with greater than 250 hours inspect at the next oil change or 100hr/annual whichever first and thereafter at each 500hr magneto inspection.
(Magneto operating time is defined as magneto engine operating time since new or since carbon brush replacement, whichever occurs first)
Follow the instructions in the service bulletin if premature wear of the carbon brushes are found. No further inspections per this bulletin are required unless carbon brushes or distributor blocks are replaced. If the carbon brushes or distributor blocks are replaced at any magneto 500 hour inspection then the subject magneto will have to be inspected again following the above schedule until Unison Industries implements terminating action.
NOTE: We are aware the above inspection schedules for both bulletins do not exactly follow the inspection schedule called for in each bulletin. However, the above inspection schedules meet the intent of each bulletin and allows for each inspection while the aircraft is already down for maintenance.
Please call or email if you have any questions concerning either bulletin.