minor modifications were incorporated into the ignition system.
The aft end of the igniter steel case, which contains the igniter
nozzle insert, was thickened to eliminate a localized weakness.
The igniter internal case insulation was tapered to improve the
manufacturing process. Finally, although vacuum putty is still being
used at the joint of the igniter and case forward dome, it was changed
to eliminate asbestos as one of its constituents.