REMOVAL AND REPLACEMENT PROCEDURE FOR NOZZLE CLOSURE, IM99B BOOST MOTOR
OGDEN AIR LOGISTICS CENTER HILL AFB UT
Pagination or Media Count:
The nozzle opening of the 1M99B Boost Motor M51 Rocket Motor is sealed by a polyurethane foam closure bonded to the nozzle expansion cone. Occasionally the closure is damaged and must be removed and replaced. The removal procedure consists of very carefully chiseling away the polyurethane foam until the bonding material is exposed. The bonding material polysulfide sealing compound is then removed by pealing back with the fingers and by sanding. The closure is replaced by applying a commercial sealing compound to the closure and nozzle expansion cone, inserting the closure into the cone and allowing the sealing compound to cure. Field or depot removal and replacement of damaged closures is practical. No special tools or equipment is required. Necessary material and parts are available through normal supply channels.
- Solid Propellant Rocket Engines