The Airplane Factory
Manufacturing Organization
DC-SBU-003-X-X-1
Service Bulletin
Issue 1, 20/11/2015
Page no: 2
INSTRUCTIONS
A. EMPENNAGE AND RIB 601 INSPECTION
1. With reference to the below pictures, the rib should be replaced at 2000 hours as a mandatory
requirement, however it should be inspected annually and be replaced immediately if a crack is noticed,
after which the rib must still be inspected annually. Should the rib be satisfactory and without any cracks
and corrosion an entry should be made into the logbook that this inspection has taken place and has been
found satisfactory.
2. Again with reference to the above pictures, the entire rib needs to be inspected and the areas within the
yellow boxes need to be inspected closely and these are the areas where the cracks are most likely to be
found.
3. Should the rib fail the inspection for corrosion or cracks being found, the entire rib 601 component will
need to be replaced with thicker and stronger material which can be ordered through The Airplane
Factory Store.
4. If the rib has failed the inspection the next steps will need to be followed in order to remove and replace
the rib.
5. Using the two 3/8” spanners you will need to loosen the two bolts that attach the rudder cables to the
rudder. With reference to the below picture, loosen the bolts that are within the yellow circles.
6. Once the two rudder cables have been removed, push the rudder over to either the left or right, this will
enable you to loosen the three rudder hinge bolts using 3/8” spanners.
7. Using the two 3/8” spanners, loosen the three rudder hinge bolts so as to remove the rudder from the
vertical fin.
8. With reference to the below picture, loosen all four bolts using the two 3/8” spanners.
