k. On-Board Spares. Check to ensure that all required on-board spares are present and
serviceable. On-board spares for the M157 Smoke Generator Set consist of 20 engine valves, 2 engine
heads, 1 backstop valve, 1 backstop washer, 1 locking washer, 1 machine bolt and 1 nozzle clamp.
Figure 3-1. Service points on a fire extinguisher
Figure 3-2. Tools required for the M157 Smoke Generator Set.